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- 10th October 2018, 13:08 #1
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How to use TM1637 chip for LED Display?
Hi All,
For the past 10 days, I have been trying to make the TM1637 work with PBP 2.60C but till now I have not been successful. It's a real low cost module. The price of the TM1637 4-digit 7-segment 0.36" display module is about $ 0.60 in Ali Express. There is a 0.56" version and that costs about $ 1.25.
The module works fine with Arduino, but all the important instructions to interface with TM1637 are in the library file (TM1637Display.h). After spending some time with the library file, I decided to study the datasheet of the chip and write the required code in PBP. The protocol followed by the chip is very similar to I2C with a few differences. Like I2C, it's a two-wire interface but you can have only one slave on the bus and hence there is no slave address. Secondly, while transmitting a byte, the LS bit is sent first.
The code I wrote for PIC 12F1840 is shown below and it is extremely simple. It should make the number '2' appear on the leftmost digit of the display. When I tested the code, the diagnostic LED blinked, but after that nothing happened. I used Saleae Logic Analyzer to check whether the Clock & Data pulses and Ack were all OK. After some tweaking, I managed to get everything correct (Screenshot file attached). The only issue is, the display shows nothing! Since I know that the module is working fine with Arduino, it's my code in PBP that needs to be looked into.
I would highly appreciate any helpful hint, suggestion or sample code.
- Bala
'---------------------------------------------------------------------------
' This code is for using TM1637 with Four-digit 7-segment LED Display
' with PIC12F1840. Osc is set at 16MHz.
'---------------------------------------------------------------------------
'---------------------------------------------------------------------------
'12F1840 Pinout:
' -------------------------------------------------------
' VDD VSS
' PortA.5 = Not_used PortA.0 = LED
' PortA.4 = Not_used PortA.1 = DIO
' PortA.3 = Not_used PortA.2 = CLK
' -------------------------------------------------------
'@ __CONFIG _CONFIG1, _FOSC_INTOSC & _WDTE_ON & _PWRTE_ON & _MCLRE_OFF & _BOREN_OFF
'@ __CONFIG _CONFIG2, _PLLEN_OFF & _BORV_LO & _LVP_OFF
ASM
ifndef __12F1840
error "12F1840 not selected"
endif
ENDASM
OSCCON = %01111000 '16MHz HF, software PLL disabled
DEFINE OSC 16
'Port direction
TRISA = %001000 'A.3 is input, rest are outputs.
CM1CON0 = 0 'Disable comparator
ANSELA = 0 'Disable A to D
'List of Aliases
LED var PortA.0
DIO var PortA.1
CLK var PortA.2
TrisDIO VAR TrisA.1
'List of variables
Cnt var byte
ByteToSend var byte 'Command or Data byte to be sent
DispCmd var byte
dispcmd = 64 'Command byte for displaying characters starting with the leftmost digit (0b01000000)
Brt8Cmd var byte
brt8cmd = 143 'Command byte for display on with maximum brightness (0b10001111)
Dig1Addr var byte
dig1addr = 192 'Address of digit 1 (left most) (0b11000000)
DispNum var byte
dispnum = 146 ' "2" (Common anode) (10010010)
'Diagnostic routine
DiagRoutine:
for cnt = 1 to 4 'Blink LED 4 times.
led = 1 : pause 100
led = 0 : pause 100
next cnt
goto start
'Subroutines
StartCondition:
clk = 0
dio = 1
clk = 1
pauseus 50
dio = 0 'DIO goes low when CLK is high.
pauseus 50
return
SendTheByte:
clk = 0
for cnt = 7 to 0 step -1 'Send 8 bits of data, starting with the LSB.
dio = bytetosend.0(cnt)
pauseus 50
clk = 1
pauseus 50
clk = 0
Next cnt
'dio = 1
Trisdio = 1 ' Set Data pin direction to input to receive ACK.
pauseus 50
clk = 1
pauseus 50
clk = 0
Trisdio = 0 ' Set Data pin direction back to output.
return
StopCondition:
clk = 0
dio = 0
clk = 1
pauseus 50
dio = 1 'DIO goes high when CLK is high.
pauseus 50
return
START:
bytetosend = brt8cmd 'Brt8Cmd (10001111) (143) = Command for Display On with Maximum Brightness
gosub startcondition
gosub sendthebyte
gosub stopcondition
bytetosend = dispcmd 'DispCmd (01000000) (64) = Command byte with auto increment sent before sending the digit data
gosub startcondition
gosub sendthebyte
gosub stopcondition
bytetosend = dig1addr 'Dig1Addr (11000000) (192) = Address of digit 1 (leftmost digit)
gosub startcondition
gosub sendthebyte
bytetosend = dispnum ' Number "2" (10010010) (146) (Common anode)
gosub sendthebyte
gosub stopcondition
ENDLast edited by Balachandar; - 10th October 2018 at 13:15.
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- 10th October 2018, 14:12 #2
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Re: How to use TM1637 chip for LED Display?
Don't know much about your TM1637, but the one thing that jumped out for me was:
I think your FOR/NEXT would be shifting MSB first (bit7, bit6, bit5...)Code:for cnt = 7 to 0 step -1 'Send 8 bits of data, starting with the LSB. dio = bytetosend.0(cnt)
If you're getting bits banging out, maybe I'm wrong, but try:
Haven't tried that code, not even in simulation.Code:for cnt = 0 to 7 dio = bytetosend.(cnt)
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- 10th October 2018, 14:39 #3
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Re: How to use TM1637 chip for LED Display?
Mike is correct
try this , it works on a 12f1822
note leds 2,3 and 4 show random crap since nothing is written to them
and not using lat regs is asking for trouble
nearly forgot dispnum = 146 ' "2" (Common anode) (10010010)
not on my display
dispnum = $5b ' "2" (Common anode) (01011101)
Code:OSCCON = %01111000 '16MHz HF, software PLL disabled DEFINE OSC 16 'Port direction TRISA = %001000 'A.3 is input, rest are outputs. CM1CON0 = 0 'Disable comparator ANSELA = 0 'Disable A to D 'List of Aliases LED var PortA.0 DIO var LATA.1 CLK var LATA.2 TrisDIO VAR TrisA.1 'List of variables Cnt var byte ByteToSend var byte 'Command or Data byte to be sent DispCmd var byte dispcmd = 64 'Command byte for displaying characters starting with the leftmost digit (0b01000000) Brt8Cmd var byte brt8cmd = 143 'Command byte for display on with maximum brightness (0b10001111) Dig1Addr var byte dig1addr = 192 'Address of digit 1 (left most) (0b11000000) DispNum var byte dispnum = $5B' "2" (Common anode) (10010010) 'Diagnostic routine DiagRoutine: CLK=1 for cnt = 1 to 4 'Blink LED 4 times. led = 1 : pause 100 led = 0 : pause 100 next cnt goto start 'Subroutines StartCondition: clk = 0 dio = 1 clk = 1 pauseus 50 dio = 0 'DIO goes low when CLK is high. pauseus 50 return SendTheByte: clk = 0 for cnt = 0 to 7 'Send 8 bits of data, starting with the LSB. dio = bytetosend.0(cnt) pauseus 50 clk = 1 pauseus 50 clk = 0 Next cnt 'dio = 1 Trisdio = 1 ' Set Data pin direction to input to receive ACK. pauseus 50 clk = 1 pauseus 50 clk = 0 Trisdio = 0 ' Set Data pin direction back to output. return StopCondition: clk = 0 dio = 0 clk = 1 pauseus 50 dio = 1 'DIO goes high when CLK is high. pauseus 50 return START: bytetosend = dispcmd 'DispCmd (01000000) (64) = Command byte with auto increment sent before sending the digit data gosub startcondition gosub sendthebyte gosub stopcondition bytetosend = dig1addr 'Dig1Addr (11000000) (192) = Address of digit 1 (leftmost digit) gosub startcondition gosub sendthebyte bytetosend = dispnum ' Number "2" (10010010) (146) (Common anode) gosub sendthebyte gosub stopcondition bytetosend = brt8cmd 'Brt8Cmd (10001111) (143) = Command for Display On with Maximum Brightness gosub startcondition gosub sendthebyte gosub stopcondition END
Last edited by richard; - 10th October 2018 at 14:45.
This is more entertaining than Free to Air TV
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- 11th October 2018, 05:57 #4
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Re: How to use TM1637 chip for LED Display?
Mpgmike & Richard, thanks a lot for your comments and suggestions.
I first tried 'FOR Cnt = 0 to 7'. Since that didn't work, I changed the code to ''FOR Cnt = 7 to 0 STEP -1' to see whether that would make a difference; still the display wouldn't turn on. I agree; if the LSB is to be sent first, it should be 'FOR Cnt = 0 to 7'.
Richard, you are saying, not using LAT registers is asking for trouble. But since the bits for PortA 0, 1 & 2 are cleared in the TRIS register, they have been clearly defined as outputs right in the beginning of the code. Would it make any difference, whether you call it PortA.1 or LATA.1? Are you not referring to the Output in either case? Secondly, referring to the output as LAT results in compilation errors in PBP 2.60C for older PICs like 12F683.
I corrected the code as per the suggestions given, but the display does not turn on. I also tried the same code with a 12F683 at 8MHz IntOsc. Again, there is no good news to report.
In the absence of any working PBP code for TM1637, my only option seems to be that I need to do an in-depth study of the Arduino library files and get a clear understanding to be able to write a working PBP code.
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- 11th October 2018, 06:41 #5
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Re: How to use TM1637 chip for LED Display?
the corrected version of your code I posted works for meIn the absence of any working PBP code for TM1637, my only option seems to be that I need to do an in-depth study of the Arduino library files and get a clear understanding to be able to write a working PBP code.
the code I posted here works
http://www.picbasic.co.uk/forum/showthread.php?t=23417
sheldons code posted here works
http://www.picbasic.co.uk/forum/showthread.php?t=23974
your code is a bit glitchy and about 30 times too slow but it can work
see difference in these picsThis is more entertaining than Free to Air TV
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- 11th October 2018, 06:45 #6
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Re: How to use TM1637 chip for LED Display?
its all about rmw errors , 12f683 has no lat regsRichard, you are saying, not using LAT registers is asking for trouble. But since the bits for PortA 0, 1 & 2 are cleared in the TRIS register, they have been clearly defined as outputs right in the beginning of the code. Would it make any difference, whether you call it PortA.1 or LATA.1? Are you not referring to the Output in either case? Secondly, referring to the output as LAT results in compilation errors in PBP 2.60C for older PICs like 12F683.
https://www.microchip.com/webinars.m...cName=en556253This is more entertaining than Free to Air TV
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- 16th October 2018, 14:05 #7
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Re: How to use TM1637 chip for LED Display?
Thank you Richard, for the clarity you provided on LAT registers.
Couple of days back, I downloaded PBP 3.1.1 with the idea of trying it out and to compile codes written for Ver 3 and above.
I used your demo code (TM1637-DEMO.pbp.txt), made suitable changes for PIC 18F2620 at 32MHz, configured PortB pins 0, 6 & 7 for LED, DIO & CLK respectively and made the required changes in the ASM section for the same. But on compiling, many errors are reported like "Illegal opcode (FSR0)" and "Found label after column 1".
Attached is my code and the screenshot showing the compilation errors. I am clueless as to where the issue is and your help is appreciated.
Screenshot showing errors:Code:define OSC 32 ' (8 x 4 = 32) ; --- *** Oscillator *** --------------------------------------------------- OSCCON = %01110000 'Int Osc: 8MHz '(Bits 4, 5 & 6 determine the internal clock speed). ' 111 = 8MHz 110 = 4MHz 'OSCTUNE = %10000000 'PLL is disabled. OSCTUNE = %11000000 'PLL is enabled. TRISA = 0 TRISB = 0 TRISC = 0 CMCON = 7 'Disable the comparators of PortA ADCON0 = 0 'Disable ADC ADCON1 = 15 'All pins of Port A are digital I/O ' ANSELb = 0 ' ANSELA = 0 ' ANSELC = 0 LED VAR PORTB.0 ' Assign name "LED" to USERCOMMAND "DISPLED" ; BUFFER{,COLON } USERCOMMAND "STRLEN" ; BUFFER USERCOMMAND "RJUSTBUFF" ; BUFFER TM_BIT VAR BYTE BANK0 TM_DAT VAR BYTE BANK0 TM_NAK VAR BYTE BANK0 ;set to $80 if tx error occured TM_DIG VAR BYTE BANK0 TM_BRIGHT VAR BYTE BANK0 ;display pwm level 0 to 7 TM_COLON VAR BYTE BANK0 ;display colon 0/1 TM_TMP VAR BYTE[2] BANK0 str_len VAR BYTE BANK0 CMD_AUTO_ADDR CON $40 START_ADDR CON $c0 NUM_DIGITS CON 4 ;number of 7seg leds COLON_FLAG CON $80 DISPLAY_ON CON $88 ;tm1637 DIO AND CLK NEED TO BE ON SAME PORT @TM_OUT_PORT = LATB ;TM_DIO OUT @TM_IN_PORT = PORTB ;TM_DIO IN @TM_CLK = 6 ;PIN @TM_DIO = 7 ;PIN @TM_TRIS = TRISB BLINK VAR BYTE LEDBUFF VAR BYTE[NUM_DIGITS +1] COUNTER VAR byte GOTO OVERASM ASM DISPLED?B macro BUFFER movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H L?CALL _TM_DISP4 endm DISPLED?BC macro BUFFER ,COLON movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H MOVE?CB COLON ,_TM_COLON L?CALL _TM_DISP4 endm DISPLED?BB macro BUFFER ,COLON movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H MOVE?BB COLON ,_TM_COLON L?CALL _TM_DISP4 endm STRLEN?B macro BUF MOVE?CB high BUF, FSR0H ;load highbyte MOVE?CB low BUF, FSR0L ;load low byte L?CALL STRlen endm RJUSTBUFF?B macro BUF MOVE?CB high BUF, FSR0H ;load highbyte MOVE?CB low BUF, FSR0L ;load low byte MOVE?CB low BUF, _TM_TMP ;load low byte MOVE?CB HIGH BUF, _TM_TMP+1 ;load low byte L?CALL STRlen L?CALL _strpad endm STRlen ;get buffer usage size CLRF _str_len str_tok_chr MOVIW FSR0 ++ ; Get character btfsC STATUS,Z goto exit_str_null ; EXIT ON Null char INCF _str_len,F ; not null so increment index goto str_tok_chr exit_str_null return _strpad ;right justify by padding with spaces " " BANKSEL _str_len movlw _NUM_DIGITS+1 ;buffer size subwf _str_len,f ;tx string size comf _str_len,f ;the difference is number of spaces to SHIFT in btfsc STATUS, Z goto expd ;if zero difference then exit nxpd movf _TM_TMP,w ;addr of buffer l MOVWF FSR0 movf _TM_TMP+1,w ;addr of buffer h MOVWF FSR0+1 movlw _NUM_DIGITS addwf FSR0,f movf FSR0,w movwf FSR1 movf FSR0+1,w movwf FSR1+1 DECF FSR0,F ;offset pointer 0 BANKSEL _TM_BIT movlw _NUM_DIGITS movwf _TM_BIT nxby ;buffer shift right x 1 MOVIW FSR0 -- MOVWI FSR1 -- DECFSZ _TM_BIT,F GOTO nxby movlw 0x20 MOVWI FSR1 -- ;poke a space in buff[0] BANKSEL _str_len DECFSZ _str_len,F ;need another one ? goto nxpd expd ;nah! return SEG_val CHK?RP _TM_TMP MOVWF _TM_TMP SUBLW 0x21 btfsc STATUS, C retlw 0 ;" " MOVF _TM_TMP,W SUBLW 0x2f btfsc STATUS, C retlw 64 ;"-" MOVF _TM_TMP,W MOVLW 0X40 SUBWF _TM_TMP,W btfsC STATUS, C GOTO TM_ALPHA MOVF _TM_TMP,W ANDLW 0X0F GOTO TM_LU TM_ALPHA ANDLW 0xdf ;ucase SUBLW 6 btfsS STATUS, C retlw 0 ;ERROR MOVLW 0X37 SUBWF _TM_TMP,W ANDLW 0xdf ;ucase TM_LU BRW retlw 0X3F ;0 retlw 6 retlw 0X5B retlw 0X4F retlw 0X66 retlw 0X6D retlw 0X7D retlw 7 retlw 0X7F retlw 0X67 ;9 retlw 0X77 ;A retlw 0X7C ;b retlw 0X39 ;C retlw 0X5E ;d retlw 0X79 ;E retlw 0X71 ;F TM_START CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK BSF TM_OUT_PORT,TM_DIO NOP BCF TM_OUT_PORT,TM_DIO NOP BCF TM_OUT_PORT,TM_CLK NOP RETURN TM_STOP CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK BCF TM_OUT_PORT,TM_DIO NOP BSF TM_OUT_PORT,TM_CLK NOP BSF TM_OUT_PORT,TM_DIO NOP RETURN TM_WRITE MOVLW 8 CHK?RP _TM_BIT MOVWF _TM_BIT NXBT CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK CHK?RP _TM_DAT BTFSS _TM_DAT,0 GOTO TM_0 CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_DIO GOTO TM_NB TM_0 CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_DIO TM_NB CHK?RP _TM_DAT RRF _TM_DAT,F CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK CHK?RP _TM_BIT DECFSZ _TM_BIT,F GOTO NXBT CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK CHK?RP TM_TRIS BSF TM_TRIS,TM_DIO CHK?RP TM_IN_PORT BTFSC TM_IN_PORT,TM_DIO BSF _TM_NAK,7 CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK NOP NOP NOP NOP BCF TM_OUT_PORT,TM_CLK CHK?RP TM_TRIS BCF TM_TRIS ,TM_DIO RST?RP RETURN _TM_INIT CHK?RP _TM_COLON CLRF _TM_COLON CLRF _TM_BRIGHT CHK?RP TM_TRIS BCF TM_TRIS ,TM_DIO BCF TM_TRIS ,TM_CLK RST?RP RETURN _TM_DISP4 MOVLW _CMD_AUTO_ADDR CHK?RP _TM_DAT MOVWF _TM_DAT CLRF _TM_NAK CALL TM_START CALL TM_WRITE CALL TM_STOP MOVLW _NUM_DIGITS CHK?RP _TM_DIG MOVWF _TM_DIG MOVLW _START_ADDR CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE NXDIG MOVIW FSR0 ++ CALL SEG_val CHK?RP _TM_DAT IORWF _TM_COLON ,W movwf _TM_DAT CALL TM_WRITE CHK?RP _TM_DIG DECFSZ _TM_DIG,F GOTO NXDIG CALL TM_STOP CHK?RP _TM_BRIGHT MOVF _TM_BRIGHT ,W ANDLW 7 IORLW _DISPLAY_ON CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE CALL TM_STOP RST?RP RETURN ENDASM OVERASM: CALL TM_INIT ALOOP: TOGGLE LED TM_BRIGHT=TM_BRIGHT-1 if TM_BRIGHT>7 then TM_BRIGHT=7 ARRAYWRITE LEDBUFF ,["b- ",#TM_BRIGHT,0] DISPLED LEDBUFF,0 PAUSE 500 FOR COUNTER=0 TO 255 ARRAYWRITE LEDBUFF ,[hex COUNTER,0] RJUSTBUFF LEDBUFF DISPLED LEDBUFF,BLINK PAUSE 50 NEXT FOR COUNTER=0 TO 255 IF !(COUNTER//20) THEN BLINK = TM_COLON ^ $80 ARRAYWRITE LEDBUFF ,[sdec COUNTER,0] RJUSTBUFF LEDBUFF DISPLED LEDBUFF,BLINK PAUSE 50 NEXT goto ALOOP
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- 16th October 2018, 22:50 #8
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Re: How to use TM1637 chip for LED Display?
MY code is for a pic16 with enhanced core it needs some changes to operate on older chips and/or pic18
moviw fsrx ++ can be replaced with
MOVF INDFx,W
INCF FSRx
brw becomes
addwf PCL, F ; as long as you don't overflow pcl
pic 18 has no rrf code
repl with rrcf
PIC 18F2620 version , not tested did compile ok
Code:#CONFIG CONFIG OSC=INTIO67, FCMEN=OFF, IESO=OFF, PWRT=OFF, BOREN=SBORDIS, BORV=3 CONFIG WDT=ON, WDTPS=512, CCP2MX=PORTC, PBADEN=OFF, LPT1OSC=OFF, MCLRE=ON CONFIG STVREN=ON, LVP=OFF, XINST=OFF, DEBUG=OFF, CP0=OFF, CP1=OFF, CP2=OFF CONFIG CP3=OFF, CPB=OFF, CPD=OFF, WRT0=OFF, WRT1=OFF, WRT2=OFF, WRT3=OFF CONFIG WRTC=OFF, WRTB=OFF, WRTD=OFF, EBTR0=OFF, EBTR1=OFF, EBTR2=OFF CONFIG EBTR3=OFF, EBTRB=OFF #ENDCONFIG define OSC 32 ' (8 x 4 = 32) ; --- *** Oscillator *** --------------------------------------------------- OSCCON = %01110000 'Int Osc: 8MHz '(Bits 4, 5 & 6 determine the internal clock speed). ' 111 = 8MHz 110 = 4MHz 'OSCTUNE = %11000000 'PLL is disabled. what?????????????? OSCTUNE.6 = 1 'PLL is enabled. TRISA = 0 TRISB = 0 TRISC = 0 'CMCON = 7 'Disable the comparators of PortA 'ADCON0 = 0 'Disable ADC ADCON1 = 15 'All pins of Port A are digital I/O ' ANSELb = 0 ' ANSELA = 0 ' ANSELC = 0 LED VAR PORTB.0 ' Assign name "LED" to USERCOMMAND "DISPLED" ; BUFFER{,COLON } USERCOMMAND "STRLEN" ; BUFFER USERCOMMAND "RJUSTBUFF" ; BUFFER TM_BIT VAR BYTE BANK0 TM_DAT VAR BYTE BANK0 TM_NAK VAR BYTE BANK0 ;set to $80 if tx error occured TM_DIG VAR BYTE BANK0 TM_BRIGHT VAR BYTE BANK0 ;display pwm level 0 to 7 TM_COLON VAR BYTE BANK0 ;display colon 0/1 TM_TMP VAR BYTE[2] BANK0 str_len VAR BYTE BANK0 CMD_AUTO_ADDR CON $40 START_ADDR CON $c0 NUM_DIGITS CON 4 ;number of 7seg leds COLON_FLAG CON $80 DISPLAY_ON CON $88 ;tm1637 DIO AND CLK NEED TO BE ON SAME PORT @TM_OUT_PORT = LATB ;TM_DIO OUT @TM_IN_PORT = PORTB ;TM_DIO IN @TM_CLK = 6 ;PIN @TM_DIO = 7 ;PIN @TM_TRIS = TRISB BLINK VAR BYTE LEDBUFF VAR BYTE[NUM_DIGITS +1] COUNTER VAR byte GOTO OVERASM ASM DISPLED?B macro BUFFER movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H L?CALL _TM_DISP4 endm DISPLED?BC macro BUFFER ,COLON movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H MOVE?CB COLON ,_TM_COLON L?CALL _TM_DISP4 endm DISPLED?BB macro BUFFER ,COLON movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H MOVE?BB COLON ,_TM_COLON L?CALL _TM_DISP4 endm STRLEN?B macro BUF MOVE?CB high BUF, FSR0H ;load highbyte MOVE?CB low BUF, FSR0L ;load low byte L?CALL STRlen endm RJUSTBUFF?B macro BUF MOVE?CB high BUF, FSR0H ;load highbyte MOVE?CB low BUF, FSR0L ;load low byte MOVE?CB low BUF, _TM_TMP ;load low byte MOVE?CB HIGH BUF, _TM_TMP+1 ;load low byte L?CALL STRlen L?CALL _strpad endm STRlen ;get buffer usage size CLRF _str_len str_tok_chr ;MOVIW FSR0 ++ ; Get character MOVF INDF0,W INCF FSR0 btfsC STATUS,Z goto exit_str_null ; EXIT ON Null char INCF _str_len,F ; not null so increment index goto str_tok_chr exit_str_null return _strpad ;right justify by padding with spaces " " BANKSEL _str_len movlw _NUM_DIGITS+1 ;buffer size subwf _str_len,f ;tx string size comf _str_len,f ;the difference is number of spaces to SHIFT in btfsc STATUS, Z goto expd ;if zero difference then exit nxpd movf _TM_TMP,w ;addr of buffer l MOVWF FSR0 movf _TM_TMP+1,w ;addr of buffer h MOVWF FSR0+1 movlw _NUM_DIGITS addwf FSR0,f movf FSR0,w movwf FSR1 movf FSR0+1,w movwf FSR1+1 DECF FSR0,F ;offset pointer 0 BANKSEL _TM_BIT movlw _NUM_DIGITS movwf _TM_BIT nxby ;buffer shift right x 1 ;MOVIW FSR0 -- MOVF INDF0,W DECF FSR0 ;MOVWI FSR1 -- MOVF INDF1,W DECF FSR1 DECFSZ _TM_BIT,F GOTO nxby movlw 0x20 ;MOVWI FSR1 -- ;poke a space in buff[0] MOVF INDF1,W DECF FSR1 BANKSEL _str_len DECFSZ _str_len,F ;need another one ? goto nxpd expd ;nah! return SEG_val CHK?RP _TM_TMP MOVWF _TM_TMP SUBLW 0x21 btfsc STATUS, C retlw 0 ;" " MOVF _TM_TMP,W SUBLW 0x2f btfsc STATUS, C retlw 64 ;"-" MOVF _TM_TMP,W MOVLW 0X40 SUBWF _TM_TMP,W btfsC STATUS, C GOTO TM_ALPHA MOVF _TM_TMP,W ANDLW 0X0F GOTO TM_LU TM_ALPHA ANDLW 0xdf ;ucase SUBLW 6 btfsS STATUS, C retlw 0 ;ERROR MOVLW 0X37 SUBWF _TM_TMP,W ANDLW 0xdf ;ucase TM_LU addwf PCL, F retlw 0X3F ;0 retlw 6 retlw 0X5B retlw 0X4F retlw 0X66 retlw 0X6D retlw 0X7D retlw 7 retlw 0X7F retlw 0X67 ;9 retlw 0X77 ;A retlw 0X7C ;b retlw 0X39 ;C retlw 0X5E ;d retlw 0X79 ;E retlw 0X71 ;F TM_START CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK BSF TM_OUT_PORT,TM_DIO NOP BCF TM_OUT_PORT,TM_DIO NOP BCF TM_OUT_PORT,TM_CLK NOP RETURN TM_STOP CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK BCF TM_OUT_PORT,TM_DIO NOP BSF TM_OUT_PORT,TM_CLK NOP BSF TM_OUT_PORT,TM_DIO NOP RETURN TM_WRITE MOVLW 8 CHK?RP _TM_BIT MOVWF _TM_BIT NXBT CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK CHK?RP _TM_DAT BTFSS _TM_DAT,0 GOTO TM_0 CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_DIO GOTO TM_NB TM_0 CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_DIO TM_NB CHK?RP _TM_DAT RRCF _TM_DAT,F CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK CHK?RP _TM_BIT DECFSZ _TM_BIT,F GOTO NXBT CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK CHK?RP TM_TRIS BSF TM_TRIS,TM_DIO CHK?RP TM_IN_PORT BTFSC TM_IN_PORT,TM_DIO BSF _TM_NAK,7 CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK NOP NOP NOP NOP BCF TM_OUT_PORT,TM_CLK CHK?RP TM_TRIS BCF TM_TRIS ,TM_DIO RST?RP RETURN _TM_INIT CHK?RP _TM_COLON CLRF _TM_COLON CLRF _TM_BRIGHT CHK?RP TM_TRIS BCF TM_TRIS ,TM_DIO BCF TM_TRIS ,TM_CLK RST?RP RETURN _TM_DISP4 MOVLW _CMD_AUTO_ADDR CHK?RP _TM_DAT MOVWF _TM_DAT CLRF _TM_NAK CALL TM_START CALL TM_WRITE CALL TM_STOP MOVLW _NUM_DIGITS CHK?RP _TM_DIG MOVWF _TM_DIG MOVLW _START_ADDR CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE NXDIG ;MOVIW FSR0 ++ MOVF INDF0,W INCF FSR0 CALL SEG_val CHK?RP _TM_DAT IORWF _TM_COLON ,W movwf _TM_DAT CALL TM_WRITE CHK?RP _TM_DIG DECFSZ _TM_DIG,F GOTO NXDIG CALL TM_STOP CHK?RP _TM_BRIGHT MOVF _TM_BRIGHT ,W ANDLW 7 IORLW _DISPLAY_ON CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE CALL TM_STOP RST?RP RETURN ENDASM OVERASM: CALL TM_INIT ALOOP: TOGGLE LED TM_BRIGHT=TM_BRIGHT-1 if TM_BRIGHT>7 then TM_BRIGHT=7 ARRAYWRITE LEDBUFF ,["b- ",#TM_BRIGHT,0] DISPLED LEDBUFF,0 PAUSE 500 FOR COUNTER=0 TO 255 ARRAYWRITE LEDBUFF ,[hex COUNTER,0] RJUSTBUFF LEDBUFF DISPLED LEDBUFF,BLINK PAUSE 50 NEXT FOR COUNTER=0 TO 255 IF !(COUNTER//20) THEN BLINK = TM_COLON ^ $80 ARRAYWRITE LEDBUFF ,[sdec COUNTER,0] RJUSTBUFF LEDBUFF DISPLED LEDBUFF,BLINK PAUSE 50 NEXT goto ALOOPThis is more entertaining than Free to Air TV
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- 17th October 2018, 07:23 #9
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- May 2011
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- Bangalore, India
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Re: How to use TM1637 chip for LED Display?
I used your 18F2620 version of the code for TM1637. It compiles OK, but in the subsequent test with the 18F2620 on a breadboard, the LED lights up and stays lit without anything happening to the LED module. In order to make sure that the PIC is working, I added a For-Next loop to make the LED blink 3 times for 500mS each as a diagnostic routine before the main code executes. Now, the LED blinks correctly telling me that the PIC is working properly at 32MHz. But this is what happens: 3 Blinks, gap of 1 second, 3 blinks and so on. I feel, the PIC is getting reset repeatedly.
Then I tried your original code with 12F1840. The compilation goes through without any errors. But when tested with the LED module, the LED stays lit and the TM1637 LED module does not light up.
Please let me know if you want me to post the code I used for the two PICs.
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- 17th October 2018, 08:20 #10
- Join Date
- May 2013
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- australia
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- 1,671
Re: How to use TM1637 chip for LED Display?
this works for me ,its for a 12f1822 and should run on a 12f1840 as isThen I tried your original code with 12F1840. The compilation goes through without any errors. But when tested with the LED module, the LED stays lit and the TM1637 LED module does not light up.
Please let me know if you want me to post the code I used for the two PICs.
if you post your code I will look at it,
Code:'**************************************************************** '* Name :tm1637-demo.PBP * '* Author : richard * '* Notice : * '* : * '* Date : * '* Version : * '* Notes : PIC12f1822 * '* : dio on RA1 clk RA2 * '**************************************************************** #CONFIG __config _CONFIG1, _FOSC_INTOSC & _WDTE_ON & _PWRTE_OFF & _MCLRE_ON & _CP_OFF & _CPD_OFF & _BOREN_ON & _CLKOUTEN_OFF & _IESO_ON & _FCMEN_ON __config _CONFIG2, _WRT_OFF & _PLLEN_OFF & _STVREN_ON & _BORV_19 & _LVP_OFF #ENDCONFIG OSCCON = %01111000 '16MHz HF, software PLL disabled DEFINE OSC 16 ANSELA=0 USERCOMMAND "DISPLED" ; BUFFER{,COLON } TAKES 150uS FOR 4 DIGITS USERCOMMAND "STRLEN" ; BUFFER USERCOMMAND "RJUSTBUFF" ; BUFFER ;ALL NEED TO BE IN SAME BANK TM_BIT VAR BYTE BANK0 TM_DAT VAR BYTE BANK0 TM_NAK VAR BYTE BANK0 ;set to $80 if tx error occured TM_DIG VAR BYTE BANK0 TM_BRIGHT VAR BYTE BANK0 ;display pwm level 0 to 7 TM_COLON VAR BYTE BANK0 ;display colon 0/1 TM_TMP VAR BYTE[2] BANK0 str_len VAR BYTE BANK0 ;tm1637 CONSTANTS CMD_AUTO_ADDR CON $40 START_ADDR CON $c0 NUM_DIGITS CON 4 ;number of 7seg leds COLON_FLAG CON $80 DISPLAY_ON CON $88 ;tm1637 DIO AND CLK NEED TO BE ON SAME PORT @TM_OUT_PORT = LATA ;TM_DIO OUT @TM_IN_PORT = PORTA ;TM_DIO IN @TM_CLK = 2 ;PIN @TM_DIO = 1 ;PIN @TM_TRIS = TRISA BLINK VAR BYTE LEDBUFF VAR BYTE[NUM_DIGITS +1] COUNTER VAR byte GOTO OVERASM ASM DISPLED?B macro BUFFER movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H L?CALL _TM_DISP4 endm DISPLED?BC macro BUFFER ,COLON movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H CHK?RP _TM_COLON MOVE?CB COLON ,_TM_COLON L?CALL _TM_DISP4 endm DISPLED?BB macro BUFFER ,COLON movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H CHK?RP _TM_COLON MOVE?BB COLON ,_TM_COLON L?CALL _TM_DISP4 endm STRLEN?B macro BUF MOVE?CB high BUF, FSR0H ;load highbyte MOVE?CB low BUF, FSR0L ;load low byte L?CALL STRlen endm RJUSTBUFF?B macro BUF MOVE?CB high BUF, FSR0H ;load highbyte MOVE?CB low BUF, FSR0L ;load low byte CHK?RP _TM_TMP MOVE?CB low BUF, _TM_TMP ;load low byte MOVE?CB HIGH BUF, _TM_TMP+1 ;load low byte L?CALL STRlen L?CALL _strpad endm STRlen ;get buffer usage size CHK?RP _str_len CLRF _str_len str_tok_chr MOVIW FSR0 ++ ; Get character btfsC STATUS,Z goto exit_str_null ; EXIT ON Null char INCF _str_len,F ; not null so increment index goto str_tok_chr exit_str_null BANKSEL 0 return _strpad ;right justify by padding with spaces " " CHK?RP _str_len movlw _NUM_DIGITS+1 ;buffer size subwf _str_len,f ;tx string size btfsc STATUS, C ;tx string size gotcha goto expd ;if positive difference then exit buffer overrun will occur ;tx string size gotcha comf _str_len,f ;the difference is number of spaces to SHIFT in btfsc STATUS, Z goto expd ;if zero difference then exit movlw _NUM_DIGITS ;buffer size addwf _TM_TMP,f ;add NUM_DIGITS to addr of buffer nxpd movf _TM_TMP,w ;low (addr of buffer + NUM_DIGITS ) MOVWF FSR0L movwf FSR1L movf _TM_TMP+1,w ;high (addr of buffer + NUM_DIGITS ) MOVWF FSR0H movwf FSR1H DECF FSR0L,F ;offset pointer 0 movlw _NUM_DIGITS movwf _TM_BIT nxby ;buffer shift right x 1 MOVIW FSR0 -- MOVWI FSR1 -- DECFSZ _TM_BIT,F GOTO nxby movlw 0x20 MOVWI FSR1 -- ;poke a space in buff[0] DECFSZ _str_len,F ;need another one ? goto nxpd expd ;nah! BANKSEL 0 return SEG_val ;VALID INPUT 0-9 ,A-F, a-f ," " ,- CHK?RP _TM_TMP MOVWF _TM_TMP SUBLW 0x21 btfsc STATUS, C retlw 0 ;" " MOVF _TM_TMP,W SUBLW 0x2f btfsc STATUS, C retlw 64 ;"-" MOVF _TM_TMP,W MOVLW 0X40 SUBWF _TM_TMP,W btfsC STATUS, C GOTO TM_ALPHA MOVF _TM_TMP,W ANDLW 0X0F GOTO TM_LU TM_ALPHA ANDLW 0xdf ;ucase SUBLW 6 btfsS STATUS, C retlw 0 ;ERROR MOVLW 0X37 SUBWF _TM_TMP,W ANDLW 0xdf ;ucase TM_LU BRW retlw 0X3F ;0 retlw 6 retlw 0X5B retlw 0X4F retlw 0X66 retlw 0X6D retlw 0X7D retlw 7 retlw 0X7F retlw 0X67 ;9 retlw 0X77 ;A retlw 0X7C ;b retlw 0X39 ;C retlw 0X5E ;d retlw 0X79 ;E retlw 0X71 ;F TM_START CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK BSF TM_OUT_PORT,TM_DIO NOP BCF TM_OUT_PORT,TM_DIO NOP BCF TM_OUT_PORT,TM_CLK ;NOP RETURN TM_STOP CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK BCF TM_OUT_PORT,TM_DIO NOP BSF TM_OUT_PORT,TM_CLK NOP BSF TM_OUT_PORT,TM_DIO ;NOP RETURN TM_WRITE MOVLW 8 CHK?RP _TM_BIT MOVWF _TM_BIT NXBT CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK CHK?RP _TM_DAT BTFSS _TM_DAT,0 GOTO TM_0 CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_DIO GOTO TM_NB TM_0 CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_DIO TM_NB CHK?RP _TM_DAT RRF _TM_DAT,F CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK CHK?RP _TM_BIT DECFSZ _TM_BIT,F GOTO NXBT CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK CHK?RP TM_TRIS BSF TM_TRIS,TM_DIO CHK?RP TM_IN_PORT BTFSC TM_IN_PORT,TM_DIO BSF _TM_NAK,7 CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK NOP NOP NOP NOP BCF TM_OUT_PORT,TM_CLK CHK?RP TM_TRIS BCF TM_TRIS ,TM_DIO BANKSEL 0 RETURN _TM_INIT CHK?RP _TM_COLON CLRF _TM_COLON CLRF _TM_BRIGHT CHK?RP TM_TRIS BCF TM_TRIS ,TM_DIO BCF TM_TRIS ,TM_CLK BANKSEL 0 RETURN _TM_DISP4 CHK?RP _TM_DAT MOVLW _CMD_AUTO_ADDR MOVWF _TM_DAT CLRF _TM_NAK CALL TM_START CALL TM_WRITE CALL TM_STOP MOVLW _NUM_DIGITS CHK?RP _TM_DIG MOVWF _TM_DIG MOVLW _START_ADDR CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE NXDIG MOVIW FSR0 ++ CALL SEG_val CHK?RP _TM_DAT IORWF _TM_COLON ,W movwf _TM_DAT CALL TM_WRITE CHK?RP _TM_DIG DECFSZ _TM_DIG,F GOTO NXDIG CALL TM_STOP CHK?RP _TM_BRIGHT MOVF _TM_BRIGHT ,W ANDLW 7 IORLW _DISPLAY_ON CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE CALL TM_STOP BANKSEL 0 RETURN ENDASM OVERASM: CALL TM_INIT ALOOP: TM_BRIGHT=TM_BRIGHT-1 if TM_BRIGHT>7 then TM_BRIGHT=7 ARRAYWRITE LEDBUFF ,["b- ",#TM_BRIGHT,0] DISPLED LEDBUFF,0 PAUSE 500 FOR COUNTER=0 TO 255 ARRAYWRITE LEDBUFF ,[dec COUNTER,0] RJUSTBUFF LEDBUFF DISPLED LEDBUFF,0 PAUSE 50 NEXT FOR COUNTER=0 TO 255 IF !(COUNTER//20) THEN BLINK = TM_COLON ^ COLON_FLAG ARRAYWRITE LEDBUFF ,[sdec COUNTER,0] RJUSTBUFF LEDBUFF DISPLED LEDBUFF,BLINK PAUSE 50 NEXT GOTO ALOOPThis is more entertaining than Free to Air TV
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- 17th October 2018, 12:29 #11
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- May 2011
- Location
- Bangalore, India
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Re: How to use TM1637 chip for LED Display?
Compiled your code for 12F1822 for 12F1840 after adding the 'Blink LED 3 times' routine. Compilation went through without a hitch followed by programming a 12F1840. When tested, the LED blinks 3 times and goes off. Nothing else happens.
Compiled once again, this time changing the uC to 12F1822 in MC Studio. Again, the compilation went through fine. But on testing, the LED blinks and goes off, but the LED module does not come to life.
There is one more strange thing I am encountering. A month back, I bought 5 pieces of 12F1840-I/SN (SOIC package) from Ali Exp for $ 3.22. The laser printing/etching on the chip clearly shows "12F1840" and it works at 5V without any problem. But PICKIT2 identifies it as 12LF1840 and the voltage will not go beyond 3.6V. Of course, even if I use an LF version of the PIC, the TM1637 LED module should work. Every now and then, I connect the module to a Nano and check in order to make sure that there is nothing wrong with the module. Whether the voltage is 5 or 3.3, the module works fine. Understandably, the brightness is less at 3.3V.
Code used with 12F1840:
Code:' 12F1840 Pinout: ' ------------------------------------------------------- ' VDD VSS ' PortA.5 = Not_used PortA.0 = LED ' PortA.4 = Not_used PortA.1 = DIO ' PortA.3 = Not_used PortA.2 = CLK ' ------------------------------------------------------- #CONFIG __config _CONFIG1, _FOSC_INTOSC & _MCLRE_ON & _CP_OFF & _CPD_OFF __config _CONFIG2, _PLLEN_OFF & _LVP_OFF #ENDCONFIG OSCCON = %01111000 '16MHz HF, software PLL disabled DEFINE OSC 16 'Port direction TRISA = %001000 'A.3 is input, rest are outputs. ANSELA = 0 'Disable A to D CM1CON0 = 0 'Disable comparator USERCOMMAND "DISPLED" ; BUFFER{,COLON } TAKES 150uS FOR 4 DIGITS USERCOMMAND "STRLEN" ; BUFFER USERCOMMAND "RJUSTBUFF" ; BUFFER ;ALL NEED TO BE IN SAME BANK TM_BIT VAR BYTE BANK0 TM_DAT VAR BYTE BANK0 TM_NAK VAR BYTE BANK0 ;set to $80 if tx error occured TM_DIG VAR BYTE BANK0 TM_BRIGHT VAR BYTE BANK0 ;display pwm level 0 to 7 TM_COLON VAR BYTE BANK0 ;display colon 0/1 TM_TMP VAR BYTE[2] BANK0 str_len VAR BYTE BANK0 ;tm1637 CONSTANTS CMD_AUTO_ADDR CON $40 START_ADDR CON $c0 NUM_DIGITS CON 4 ;number of 7seg leds COLON_FLAG CON $80 DISPLAY_ON CON $88 ;tm1637 DIO AND CLK NEED TO BE ON SAME PORT @TM_OUT_PORT = LATA ;TM_DIO OUT @TM_IN_PORT = PORTA ;TM_DIO IN @TM_CLK = 2 ;PIN @TM_DIO = 1 ;PIN @TM_TRIS = TRISA BLINK VAR BYTE LEDBUFF VAR BYTE[NUM_DIGITS +1] COUNTER VAR byte Cnt var byte ;for use in loops LED var LATA.0 'Diagnostic routine DiagRoutine: for cnt = 1 to 3 'Blink LED 3 times. led = 1 : pause 500 led = 0 : pause 500 next cnt GOTO OVERASM ASM DISPLED?B macro BUFFER movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H L?CALL _TM_DISP4 endm DISPLED?BC macro BUFFER ,COLON movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H CHK?RP _TM_COLON MOVE?CB COLON ,_TM_COLON L?CALL _TM_DISP4 endm DISPLED?BB macro BUFFER ,COLON movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H CHK?RP _TM_COLON MOVE?BB COLON ,_TM_COLON L?CALL _TM_DISP4 endm STRLEN?B macro BUF MOVE?CB high BUF, FSR0H ;load highbyte MOVE?CB low BUF, FSR0L ;load low byte L?CALL STRlen endm RJUSTBUFF?B macro BUF MOVE?CB high BUF, FSR0H ;load highbyte MOVE?CB low BUF, FSR0L ;load low byte CHK?RP _TM_TMP MOVE?CB low BUF, _TM_TMP ;load low byte MOVE?CB HIGH BUF, _TM_TMP+1 ;load low byte L?CALL STRlen L?CALL _strpad endm STRlen ;get buffer usage size CHK?RP _str_len CLRF _str_len str_tok_chr MOVIW FSR0 ++ ; Get character btfsC STATUS,Z goto exit_str_null ; EXIT ON Null char INCF _str_len,F ; not null so increment index goto str_tok_chr exit_str_null BANKSEL 0 return _strpad ;right justify by padding with spaces " " CHK?RP _str_len movlw _NUM_DIGITS+1 ;buffer size subwf _str_len,f ;tx string size btfsc STATUS, C ;tx string size gotcha goto expd ;if positive difference then exit buffer overrun will occur ;tx string size gotcha comf _str_len,f ;the difference is number of spaces to SHIFT in btfsc STATUS, Z goto expd ;if zero difference then exit movlw _NUM_DIGITS ;buffer size addwf _TM_TMP,f ;add NUM_DIGITS to addr of buffer nxpd movf _TM_TMP,w ;low (addr of buffer + NUM_DIGITS ) MOVWF FSR0L movwf FSR1L movf _TM_TMP+1,w ;high (addr of buffer + NUM_DIGITS ) MOVWF FSR0H movwf FSR1H DECF FSR0L,F ;offset pointer 0 movlw _NUM_DIGITS movwf _TM_BIT nxby ;buffer shift right x 1 MOVIW FSR0 -- MOVWI FSR1 -- DECFSZ _TM_BIT,F GOTO nxby movlw 0x20 MOVWI FSR1 -- ;poke a space in buff[0] DECFSZ _str_len,F ;need another one ? goto nxpd expd ;nah! BANKSEL 0 return SEG_val ;VALID INPUT 0-9 ,A-F, a-f ," " ,- CHK?RP _TM_TMP MOVWF _TM_TMP SUBLW 0x21 btfsc STATUS, C retlw 0 ;" " MOVF _TM_TMP,W SUBLW 0x2f btfsc STATUS, C retlw 64 ;"-" MOVF _TM_TMP,W MOVLW 0X40 SUBWF _TM_TMP,W btfsC STATUS, C GOTO TM_ALPHA MOVF _TM_TMP,W ANDLW 0X0F GOTO TM_LU TM_ALPHA ANDLW 0xdf ;ucase SUBLW 6 btfsS STATUS, C retlw 0 ;ERROR MOVLW 0X37 SUBWF _TM_TMP,W ANDLW 0xdf ;ucase TM_LU BRW retlw 0X3F ;0 retlw 6 retlw 0X5B retlw 0X4F retlw 0X66 retlw 0X6D retlw 0X7D retlw 7 retlw 0X7F retlw 0X67 ;9 retlw 0X77 ;A retlw 0X7C ;b retlw 0X39 ;C retlw 0X5E ;d retlw 0X79 ;E retlw 0X71 ;F TM_START CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK BSF TM_OUT_PORT,TM_DIO NOP BCF TM_OUT_PORT,TM_DIO NOP BCF TM_OUT_PORT,TM_CLK ;NOP RETURN TM_STOP CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK BCF TM_OUT_PORT,TM_DIO NOP BSF TM_OUT_PORT,TM_CLK NOP BSF TM_OUT_PORT,TM_DIO ;NOP RETURN TM_WRITE MOVLW 8 CHK?RP _TM_BIT MOVWF _TM_BIT NXBT CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK CHK?RP _TM_DAT BTFSS _TM_DAT,0 GOTO TM_0 CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_DIO GOTO TM_NB TM_0 CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_DIO TM_NB CHK?RP _TM_DAT RRF _TM_DAT,F CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK CHK?RP _TM_BIT DECFSZ _TM_BIT,F GOTO NXBT CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK CHK?RP TM_TRIS BSF TM_TRIS,TM_DIO CHK?RP TM_IN_PORT BTFSC TM_IN_PORT,TM_DIO BSF _TM_NAK,7 CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK NOP NOP NOP NOP BCF TM_OUT_PORT,TM_CLK CHK?RP TM_TRIS BCF TM_TRIS ,TM_DIO BANKSEL 0 RETURN _TM_INIT CHK?RP _TM_COLON CLRF _TM_COLON CLRF _TM_BRIGHT CHK?RP TM_TRIS BCF TM_TRIS ,TM_DIO BCF TM_TRIS ,TM_CLK BANKSEL 0 RETURN _TM_DISP4 CHK?RP _TM_DAT MOVLW _CMD_AUTO_ADDR MOVWF _TM_DAT CLRF _TM_NAK CALL TM_START CALL TM_WRITE CALL TM_STOP MOVLW _NUM_DIGITS CHK?RP _TM_DIG MOVWF _TM_DIG MOVLW _START_ADDR CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE NXDIG MOVIW FSR0 ++ CALL SEG_val CHK?RP _TM_DAT IORWF _TM_COLON ,W movwf _TM_DAT CALL TM_WRITE CHK?RP _TM_DIG DECFSZ _TM_DIG,F GOTO NXDIG CALL TM_STOP CHK?RP _TM_BRIGHT MOVF _TM_BRIGHT ,W ANDLW 7 IORLW _DISPLAY_ON CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE CALL TM_STOP BANKSEL 0 RETURN ENDASM OVERASM: CALL TM_INIT ALOOP: TM_BRIGHT=TM_BRIGHT-1 if TM_BRIGHT>7 then TM_BRIGHT=7 ARRAYWRITE LEDBUFF ,["b- ",#TM_BRIGHT,0] DISPLED LEDBUFF,0 PAUSE 500 FOR COUNTER=0 TO 255 ARRAYWRITE LEDBUFF ,[dec COUNTER,0] RJUSTBUFF LEDBUFF DISPLED LEDBUFF,0 PAUSE 50 NEXT FOR COUNTER=0 TO 255 IF !(COUNTER//20) THEN BLINK = TM_COLON ^ COLON_FLAG ARRAYWRITE LEDBUFF ,[sdec COUNTER,0] RJUSTBUFF LEDBUFF DISPLED LEDBUFF,BLINK PAUSE 50 NEXT GOTO ALOOP
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- 17th October 2018, 13:37 #12
- Join Date
- May 2013
- Location
- australia
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- 1,671
Re: How to use TM1637 chip for LED Display?
.Compiled your code for 12F1822 for 12F1840 after adding the 'Blink LED 3 times' routine. Compilation went through without a hitch followed by programming a 12F1840. When tested, the LED blinks 3 times and goes off. Nothing else happens
WORKS just fine for me, even at 3v
pic18 version [can't believe how many changes it needed]
Code:'**************************************************************** '* Name :tm1637-demo.PBP * '* Author : richard * '* Notice : * '* : * '* Date : * '* Version : * '* Notes : PIC18F45K20 * '* : dio on RB0 clk RB1 * '**************************************************************** #CONFIG CONFIG FOSC = INTIO67 CONFIG FCMEN = OFF CONFIG IESO = OFF CONFIG PWRT = OFF CONFIG BOREN = SBORDIS CONFIG BORV = 18 CONFIG WDTEN = ON CONFIG WDTPS = 512 CONFIG CCP2MX = PORTC CONFIG PBADEN = OFF CONFIG LPT1OSC = OFF CONFIG HFOFST = ON CONFIG MCLRE = ON CONFIG STVREN = ON CONFIG LVP = OFF CONFIG XINST = OFF CONFIG DEBUG = OFF CONFIG CP0 = OFF CONFIG CP1 = OFF CONFIG CP2 = OFF CONFIG CP3 = OFF CONFIG CPB = OFF CONFIG CPD = OFF CONFIG WRT0 = OFF CONFIG WRT1 = OFF CONFIG WRT2 = OFF CONFIG WRT3 = OFF CONFIG WRTC = OFF CONFIG WRTB = OFF CONFIG WRTD = OFF CONFIG EBTR0 = OFF CONFIG EBTR1 = OFF CONFIG EBTR2 = OFF CONFIG EBTR3 = OFF CONFIG EBTRB = OFF #ENDCONFIG DEFINE OSC 32 osccon=$60 '32 mhz OSCTUNE.6=1 trisb.4=0 ANSELH=0 LED VAR PORTB.4 ' Assign name "LED" to USERCOMMAND "DISPLED" ; BUFFER{,COLON } USERCOMMAND "STRLEN" ; BUFFER USERCOMMAND "RJUSTBUFF" ; BUFFER TM_BIT VAR BYTE BANK0 TM_DAT VAR BYTE BANK0 TM_NAK VAR BYTE BANK0 ;set to $80 if tx error occured TM_DIG VAR BYTE BANK0 TM_BRIGHT VAR BYTE BANK0 ;display pwm level 0 to 7 TM_COLON VAR BYTE BANK0 ;display colon 0/1 TM_TMP VAR BYTE[2] BANK0 str_len VAR BYTE BANK0 CMD_AUTO_ADDR CON $40 START_ADDR CON $c0 NUM_DIGITS CON 4 ;number of 7seg leds COLON_FLAG CON $80 DISPLAY_ON CON $88 ;tm1637 DIO AND CLK NEED TO BE ON SAME PORT @TM_OUT_PORT = LATB ;TM_DIO OUT @TM_IN_PORT = PORTB ;TM_DIO IN @TM_CLK = 1 ;PIN @TM_DIO = 0 ;PIN @TM_TRIS = TRISB BLINK VAR BYTE LEDBUFF VAR BYTE[NUM_DIGITS +1] COUNTER VAR BYTE GOTO OVERASM ASM DISPLED?B macro BUFFER movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H L?CALL _TM_DISP4 endm DISPLED?BC macro BUFFER ,COLON movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H MOVE?CB COLON ,_TM_COLON L?CALL _TM_DISP4 endm DISPLED?BB macro BUFFER ,COLON movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H MOVE?BB COLON ,_TM_COLON L?CALL _TM_DISP4 endm STRLEN?B macro BUF MOVE?CB high BUF, FSR0H ;load highbyte MOVE?CB low BUF, FSR0L ;load low byte L?CALL STRlen endm RJUSTBUFF?B macro BUF MOVE?CB high BUF, FSR0H ;load highbyte MOVE?CB low BUF, FSR0L ;load low byte MOVE?CB low BUF, _TM_TMP ;load low byte MOVE?CB HIGH BUF, _TM_TMP+1 ;load low byte L?CALL STRlen L?CALL _strpad endm STRlen ;get buffer usage size CLRF _str_len str_tok_chr ;MOVIW FSR0 ++ ; Get character MOVF INDF0,W INFSNZ FSR0L incf FSR0H btfsC STATUS,Z goto exit_str_null ; EXIT ON Null char INCF _str_len,F ; not null so increment index goto str_tok_chr exit_str_null return _strpad ;right justify by padding with spaces " " BANKSEL 0 MOVLW 5 ;ADDWF _str_field_size,w ;buffer size subwf _str_len,f ;tx string size btfsc STATUS, C ;tx string size gotcha goto expd ;if positive difference then exit buffer overrun will occur ;tx string size gotcha comf _str_len ;the difference is number of spaces to SHIFT in btfsc STATUS, Z goto expd ;if zero difference then exit moVLW 4 ;buffer size addwf _TM_TMP,f ;add NUM_DIGITS to addr of buffer ;btfsc STATUS, C ;INCF _STR_TMP+1,f nxpd movf _TM_TMP,w ;low (addr of buffer + NUM_DIGITS ) MOVWF FSR0L movwf FSR1L DECF FSR0L,F ;offset pointer 0 ;btfsc STATUS, C ;DECF FSR0H,F movf _TM_TMP+1,w ;high (addr of buffer + NUM_DIGITS ) MOVWF FSR0H movwf FSR1H MOVLW 4 movwf _TM_BIT nxby ;buffer shift right x 1 ifdef TBLPTRL ;fsr movf POSTDEC0, W ;[pic18] MOVWF POSTDEC1 else MOVIW FSR0 -- MOVWI FSR1 -- endif DECFSZ _TM_BIT,F GOTO nxby movlw 0x20 ifdef TBLPTRL ;fsr MOVWF POSTDEC1 else MOVWI FSR1 -- endif DECFSZ _str_len,F ;need another one ? goto nxpd expd ;nah! BANKSEL 0 return SEG_val CHK?RP _TM_TMP MOVWF _TM_TMP CLRF _TM_TMP +1 SUBLW 0x21 btfsc STATUS, C retlw 0 ;" " MOVF _TM_TMP,W SUBLW 0x2f btfsc STATUS, C retlw 64 ;"-" MOVF _TM_TMP,W MOVLW 0X40 SUBWF _TM_TMP,W btfsC STATUS, C GOTO TM_ALPHA MOVF _TM_TMP,W ANDLW 0X0F GOTO TM_LU TM_ALPHA ANDLW 0xdf ;ucase SUBLW 6 btfsS STATUS, C retlw 0 ;ERROR MOVLW 0X37 SUBWF _TM_TMP,W ANDLW 0xdf ;ucase TM_LU addlw LOW TABLE_START movwf TBLPTRL rlcf _TM_TMP +1 ,w addlw HIGH TABLE_START movwf TBLPTRH movlw UPPER TABLE_START movwf TBLPTRU tblrd *+ movf TABLAT,w return TABLE_START db 0X3F,6,0X5B,0X4F,0X66,0X6D,0X7D,7,0X7F,0X67,0X77 ,0X7C ,0X39 ,0X5E ,0X79 ,0X71 TM_START CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK BSF TM_OUT_PORT,TM_DIO NOP BCF TM_OUT_PORT,TM_DIO NOP BCF TM_OUT_PORT,TM_CLK NOP RETURN TM_STOP CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK BCF TM_OUT_PORT,TM_DIO NOP BSF TM_OUT_PORT,TM_CLK NOP BSF TM_OUT_PORT,TM_DIO NOP RETURN TM_WRITE MOVLW 8 CHK?RP _TM_BIT MOVWF _TM_BIT NXBT CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK CHK?RP _TM_DAT BTFSS _TM_DAT,0 GOTO TM_0 CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_DIO GOTO TM_NB TM_0 CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_DIO TM_NB CHK?RP _TM_DAT RRCF _TM_DAT,F CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK CHK?RP _TM_BIT DECFSZ _TM_BIT,F GOTO NXBT CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK CHK?RP TM_TRIS BSF TM_TRIS,TM_DIO CHK?RP TM_IN_PORT BTFSC TM_IN_PORT,TM_DIO BSF _TM_NAK,7 CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK NOP NOP NOP NOP BCF TM_OUT_PORT,TM_CLK CHK?RP TM_TRIS BCF TM_TRIS ,TM_DIO RST?RP RETURN _TM_INIT CHK?RP _TM_COLON CLRF _TM_COLON CLRF _TM_BRIGHT CHK?RP TM_TRIS BCF TM_TRIS ,TM_DIO BCF TM_TRIS ,TM_CLK RST?RP RETURN _TM_DISP4 MOVLW _CMD_AUTO_ADDR CHK?RP _TM_DAT MOVWF _TM_DAT CLRF _TM_NAK CALL TM_START CALL TM_WRITE CALL TM_STOP MOVLW _NUM_DIGITS CHK?RP _TM_DIG MOVWF _TM_DIG MOVLW _START_ADDR CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE NXDIG ;MOVIW FSR0 ++ MOVF INDF0,W INFSNZ FSR0L incf FSR0H CALL SEG_val CHK?RP _TM_DAT IORWF _TM_COLON ,W movwf _TM_DAT CALL TM_WRITE CHK?RP _TM_DIG DECFSZ _TM_DIG,F GOTO NXDIG CALL TM_STOP CHK?RP _TM_BRIGHT MOVF _TM_BRIGHT ,W ANDLW 7 IORLW _DISPLAY_ON CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE CALL TM_STOP RST?RP RETURN _TM_DISP1 ; WRITES TO A DISP POSN TM_TMP HOLDS DATA FOR TM_DIG IS POSN 0-3 CHK?RP _TM_DAT MOVLW _CMD_AUTO_ADDR MOVWF _TM_DAT CALL TM_START CALL TM_WRITE CALL TM_STOP MOVLW _START_ADDR addwf _TM_DIG,W CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE CHK?RP _TM_TMP MOVF _TM_TMP,W movwf _TM_DAT CALL TM_WRITE CALL TM_STOP BANKSEL 0 RETURN ENDASM OVERASM: FOR COUNTER=0 TO 3 TOGGLE LED PAUSE 500 next CALL TM_INIT BLINK=0 ALOOP: TOGGLE LED TM_BRIGHT=TM_BRIGHT-1 if TM_BRIGHT>7 then TM_BRIGHT=7 ARRAYWRITE LEDBUFF ,["B- ",#TM_BRIGHT] DISPLED LEDBUFF,0 PAUSE 500 FOR COUNTER=0 TO 255 ARRAYWRITE LEDBUFF ,[hex COUNTER,0] RJUSTBUFF LEDBUFF DISPLED LEDBUFF,0 PAUSE 50 NEXT FOR COUNTER=0 TO 255 IF !(COUNTER//20) THEN BLINK = TM_COLON ^ $80 ARRAYWRITE LEDBUFF ,[sdec COUNTER,0] RJUSTBUFF LEDBUFF DISPLED LEDBUFF,BLINK PAUSE 50 NEXT goto ALOOPThis is more entertaining than Free to Air TV
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- 18th October 2018, 03:29 #13
- Join Date
- May 2011
- Location
- Bangalore, India
- Posts
- 27
Re: How to use TM1637 chip for LED Display?
WOW! FINALLY, IT HAPPENED!!
The TM1637 LED display module came alive!!!
I used your revised code for 18F devices and after I made a few changes in the CONFIG section, the compilation for 18F2620 was successful.
I programmed and inserted the PIC in the breadboard and powered it up. After the LED blinked 3 times, it was a real pleasant sight to see the digits appear on the LED module.
Thanks a lot Richard, for your patience and helping nature.
The code I used for 18F2620 is reproduced below.
OSCCON = $60; OSCTUNE.6 = 1 - These two settings in your code make the Osc 16Mhz (4MHz x 4). So, I changed the Osc speed from 32 to 16MHz. Later, I tried the code at 8MHz and 4MHz. It works beautifully at those speeds too.
Code:'------------------------------------------------------------------------------- 'PIC used: 18F2620 'Pinout ' --------- ' E.3 = 1 28 B.7 = ' A.0 = 2 27 B.6 = ' A.1 = 3 26 B.5 = ' A.2 = 4 25 B.4 = LED ' A.3 = 5 24 B.3 = ' A.4 = 6 23 B.2 = ' A.5 = 7 22 B.1 = CLK ' Gnd 8 21 B.0 = DIO ' A.7 = 9 20 +5V ' A.6 = 10 19 Gnd ' C.0 = 11 18 C.7 = ' C.1 = 12 17 C.6 = ' C.2 = 13 16 C.5 = ' C.3 = 14 15 C.4 = ' --------- '------------------------------------------------------------------------------- #CONFIG CONFIG OSC = INTIO67 ; CONFIG FOSC = INTIO67 CONFIG FCMEN = OFF CONFIG IESO = OFF CONFIG PWRT = OFF CONFIG BOREN = SBORDIS CONFIG BORV = 2 ; CONFIG BORV = 18 CONFIG WDT = ON ; CONFIG WDTEN = ON CONFIG WDTPS = 512 CONFIG CCP2MX = PORTC CONFIG PBADEN = OFF CONFIG LPT1OSC = OFF ; CONFIG HFOFST = ON ;Not applicable to 18F2620 CONFIG MCLRE = ON CONFIG STVREN = ON CONFIG LVP = OFF CONFIG XINST = OFF CONFIG DEBUG = OFF CONFIG CP0 = OFF CONFIG CP1 = OFF CONFIG CP2 = OFF CONFIG CP3 = OFF CONFIG CPB = OFF CONFIG CPD = OFF CONFIG WRT0 = OFF CONFIG WRT1 = OFF CONFIG WRT2 = OFF CONFIG WRT3 = OFF CONFIG WRTC = OFF CONFIG WRTB = OFF CONFIG WRTD = OFF CONFIG EBTR0 = OFF CONFIG EBTR1 = OFF CONFIG EBTR2 = OFF CONFIG EBTR3 = OFF CONFIG EBTRB = OFF #ENDCONFIG OSCCON = $60 '4 mhz OSCTUNE.6 = 1 'PLL Enabled DEFINE OSC 16 '16MHz (4X4 = 16) TRISB.4=0 ' ANSELH=0 'Not applicable to 18F2620 ADCON1 = 15 'Disable ADC LED VAR PORTB.4 ' Assign name "LED" to USERCOMMAND "DISPLED" ; BUFFER{,COLON } USERCOMMAND "STRLEN" ; BUFFER USERCOMMAND "RJUSTBUFF" ; BUFFER TM_BIT VAR BYTE BANK0 TM_DAT VAR BYTE BANK0 TM_NAK VAR BYTE BANK0 ;set to $80 if tx error occured TM_DIG VAR BYTE BANK0 TM_BRIGHT VAR BYTE BANK0 ;display pwm level 0 to 7 TM_COLON VAR BYTE BANK0 ;display colon 0/1 TM_TMP VAR BYTE[2] BANK0 str_len VAR BYTE BANK0 CMD_AUTO_ADDR CON $40 START_ADDR CON $c0 NUM_DIGITS CON 4 ;number of 7seg leds COLON_FLAG CON $80 DISPLAY_ON CON $88 ;tm1637 DIO AND CLK NEED TO BE ON SAME PORT @TM_OUT_PORT = LATB ;TM_DIO OUT @TM_IN_PORT = PORTB ;TM_DIO IN @TM_CLK = 1 ;PIN @TM_DIO = 0 ;PIN @TM_TRIS = TRISB BLINK VAR BYTE LEDBUFF VAR BYTE[NUM_DIGITS +1] COUNTER VAR BYTE GOTO OVERASM ASM DISPLED?B macro BUFFER movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H L?CALL _TM_DISP4 endm DISPLED?BC macro BUFFER ,COLON movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H MOVE?CB COLON ,_TM_COLON L?CALL _TM_DISP4 endm DISPLED?BB macro BUFFER ,COLON movlw low BUFFER movwf FSR0L movlw high BUFFER movwf FSR0H MOVE?BB COLON ,_TM_COLON L?CALL _TM_DISP4 endm STRLEN?B macro BUF MOVE?CB high BUF, FSR0H ;load highbyte MOVE?CB low BUF, FSR0L ;load low byte L?CALL STRlen endm RJUSTBUFF?B macro BUF MOVE?CB high BUF, FSR0H ;load highbyte MOVE?CB low BUF, FSR0L ;load low byte MOVE?CB low BUF, _TM_TMP ;load low byte MOVE?CB HIGH BUF, _TM_TMP+1 ;load low byte L?CALL STRlen L?CALL _strpad endm STRlen ;get buffer usage size CLRF _str_len str_tok_chr ;MOVIW FSR0 ++ ; Get character MOVF INDF0,W INFSNZ FSR0L incf FSR0H btfsC STATUS,Z goto exit_str_null ; EXIT ON Null char INCF _str_len,F ; not null so increment index goto str_tok_chr exit_str_null return _strpad ;right justify by padding with spaces " " BANKSEL 0 MOVLW 5 ;ADDWF _str_field_size,w ;buffer size subwf _str_len,f ;tx string size btfsc STATUS, C ;tx string size gotcha goto expd ;if positive difference then exit buffer overrun will occur ;tx string size gotcha comf _str_len ;the difference is number of spaces to SHIFT in btfsc STATUS, Z goto expd ;if zero difference then exit moVLW 4 ;buffer size addwf _TM_TMP,f ;add NUM_DIGITS to addr of buffer ;btfsc STATUS, C ;INCF _STR_TMP+1,f nxpd movf _TM_TMP,w ;low (addr of buffer + NUM_DIGITS ) MOVWF FSR0L movwf FSR1L DECF FSR0L,F ;offset pointer 0 ;btfsc STATUS, C ;DECF FSR0H,F movf _TM_TMP+1,w ;high (addr of buffer + NUM_DIGITS ) MOVWF FSR0H movwf FSR1H MOVLW 4 movwf _TM_BIT nxby ;buffer shift right x 1 ifdef TBLPTRL ;fsr movf POSTDEC0, W ;[pic18] MOVWF POSTDEC1 else MOVIW FSR0 -- MOVWI FSR1 -- endif DECFSZ _TM_BIT,F GOTO nxby movlw 0x20 ifdef TBLPTRL ;fsr MOVWF POSTDEC1 else MOVWI FSR1 -- endif DECFSZ _str_len,F ;need another one ? goto nxpd expd ;nah! BANKSEL 0 return SEG_val CHK?RP _TM_TMP MOVWF _TM_TMP CLRF _TM_TMP +1 SUBLW 0x21 btfsc STATUS, C retlw 0 ;" " MOVF _TM_TMP,W SUBLW 0x2f btfsc STATUS, C retlw 64 ;"-" MOVF _TM_TMP,W MOVLW 0X40 SUBWF _TM_TMP,W btfsC STATUS, C GOTO TM_ALPHA MOVF _TM_TMP,W ANDLW 0X0F GOTO TM_LU TM_ALPHA ANDLW 0xdf ;ucase SUBLW 6 btfsS STATUS, C retlw 0 ;ERROR MOVLW 0X37 SUBWF _TM_TMP,W ANDLW 0xdf ;ucase TM_LU addlw LOW TABLE_START movwf TBLPTRL rlcf _TM_TMP +1 ,w addlw HIGH TABLE_START movwf TBLPTRH movlw UPPER TABLE_START movwf TBLPTRU tblrd *+ movf TABLAT,w return TABLE_START db 0X3F,6,0X5B,0X4F,0X66,0X6D,0X7D,7,0X7F,0X67,0X77 ,0X7C ,0X39 ,0X5E ,0X79 ,0X71 TM_START CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK BSF TM_OUT_PORT,TM_DIO NOP BCF TM_OUT_PORT,TM_DIO NOP BCF TM_OUT_PORT,TM_CLK NOP RETURN TM_STOP CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK BCF TM_OUT_PORT,TM_DIO NOP BSF TM_OUT_PORT,TM_CLK NOP BSF TM_OUT_PORT,TM_DIO NOP RETURN TM_WRITE MOVLW 8 CHK?RP _TM_BIT MOVWF _TM_BIT NXBT CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK CHK?RP _TM_DAT BTFSS _TM_DAT,0 GOTO TM_0 CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_DIO GOTO TM_NB TM_0 CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_DIO TM_NB CHK?RP _TM_DAT RRCF _TM_DAT,F CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK CHK?RP _TM_BIT DECFSZ _TM_BIT,F GOTO NXBT CHK?RP TM_OUT_PORT BCF TM_OUT_PORT,TM_CLK CHK?RP TM_TRIS BSF TM_TRIS,TM_DIO CHK?RP TM_IN_PORT BTFSC TM_IN_PORT,TM_DIO BSF _TM_NAK,7 CHK?RP TM_OUT_PORT BSF TM_OUT_PORT,TM_CLK NOP NOP NOP NOP BCF TM_OUT_PORT,TM_CLK CHK?RP TM_TRIS BCF TM_TRIS ,TM_DIO RST?RP RETURN _TM_INIT CHK?RP _TM_COLON CLRF _TM_COLON CLRF _TM_BRIGHT CHK?RP TM_TRIS BCF TM_TRIS ,TM_DIO BCF TM_TRIS ,TM_CLK RST?RP RETURN _TM_DISP4 MOVLW _CMD_AUTO_ADDR CHK?RP _TM_DAT MOVWF _TM_DAT CLRF _TM_NAK CALL TM_START CALL TM_WRITE CALL TM_STOP MOVLW _NUM_DIGITS CHK?RP _TM_DIG MOVWF _TM_DIG MOVLW _START_ADDR CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE NXDIG ;MOVIW FSR0 ++ MOVF INDF0,W INFSNZ FSR0L incf FSR0H CALL SEG_val CHK?RP _TM_DAT IORWF _TM_COLON ,W movwf _TM_DAT CALL TM_WRITE CHK?RP _TM_DIG DECFSZ _TM_DIG,F GOTO NXDIG CALL TM_STOP CHK?RP _TM_BRIGHT MOVF _TM_BRIGHT ,W ANDLW 7 IORLW _DISPLAY_ON CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE CALL TM_STOP RST?RP RETURN _TM_DISP1 ; WRITES TO A DISP POSN TM_TMP HOLDS DATA FOR TM_DIG IS POSN 0-3 CHK?RP _TM_DAT MOVLW _CMD_AUTO_ADDR MOVWF _TM_DAT CALL TM_START CALL TM_WRITE CALL TM_STOP MOVLW _START_ADDR addwf _TM_DIG,W CHK?RP _TM_DAT MOVWF _TM_DAT CALL TM_START CALL TM_WRITE CHK?RP _TM_TMP MOVF _TM_TMP,W movwf _TM_DAT CALL TM_WRITE CALL TM_STOP BANKSEL 0 RETURN ENDASM OVERASM: FOR COUNTER=0 TO 3 TOGGLE LED PAUSE 500 next CALL TM_INIT BLINK=0 ALOOP: TOGGLE LED TM_BRIGHT=TM_BRIGHT-1 if TM_BRIGHT>7 then TM_BRIGHT=7 ARRAYWRITE LEDBUFF ,["B- ",#TM_BRIGHT] DISPLED LEDBUFF,0 PAUSE 500 FOR COUNTER=0 TO 255 ARRAYWRITE LEDBUFF ,[hex COUNTER,0] RJUSTBUFF LEDBUFF DISPLED LEDBUFF,0 PAUSE 50 NEXT FOR COUNTER=0 TO 255 IF !(COUNTER//20) THEN BLINK = TM_COLON ^ $80 ARRAYWRITE LEDBUFF ,[sdec COUNTER,0] RJUSTBUFF LEDBUFF DISPLED LEDBUFF,BLINK PAUSE 50 NEXT goto ALOOP
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- 18th October 2018, 04:14 #14
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Re: How to use TM1637 chip for LED Display?
WOW! FINALLY, IT HAPPENED!!
The TM1637 LED display module came alive!!!
I used your revised code for 18F devices and after I made a few changes in the CONFIG section, the compilation for 18F2620 was successful.
very good. you would have to wonder why the 12f1840 did not work
the code works up t0 64mhz and can write the 4 digits in less than 50uSI changed the Osc speed from 32 to 16MHz. Later, I tried the code at 8MHz and 4MHz. It works beautifully at those speeds too.This is more entertaining than Free to Air TV
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