Definning a VAR for Different Register Bits
Hi all,
I'm playing with a multiplexed LCD display that has 4 commons. The PIC that I'm using is the 16F1939. This PIC has a bunch of registers to set the segments in the LCD either on or off. Here are some of the registers,
Quote:
• LCDDATA0 SEG<7:0>COM0
• LCDDATA1 SEG<15:8>COM0
• LCDDATA2 SEG<23:16>COM0(1)
• LCDDATA3 SEG<7:0>COM1
• LCDDATA4 SEG<15:8>COM1
• LCDDATA5 SEG<23:16>COM1(1)
• LCDDATA6 SEG<7:0>COM2
• LCDDATA7 SEG<15:8>COM2
• LCDDATA8 SEG<23:16>COM2(1)
• LCDDATA9 SEG<7:0>COM3
• LCDDATA10 SEG<15:8>COM3
• LCDDATA11 SEG<23:16>COM3(1)
What I'm trying to do is to define a variable that contains different bits from different registers. For example, I want to define the following variable
Code:
DIGIT1.0 = LCDDATA0.0
DIGIT1.1 = LCDDATA3.0
DIGIT1.2 = LCDDATA6.0
DIGIT1.3 = LCDDATA9.0
DIGIT1.4 = LCDDATA0.1
DIGIT1.5 = LCDDATA3.1
DIGIT1.6 = LCDDATA6.1
DIGIT1.7 = LCDDATA9.1
Can this be done using VAR or SYMBOL? Any ideas / comments?
Thank you,
Robert
Re: Definning a VAR for Different Register Bits
Hi,
No, it doesn't work that way.
If you want the content of one variable (byte, word or long) to be "split up" and "spread" across several other variables or register you basically have to do it manually, exactly the way you show it.
/Henrik.
Re: Definning a VAR for Different Register Bits
Hmm, I was hopping it could be done using VAR or SYMBOL, since I don't have much free programming space in my chip.
Re: Definning a VAR for Different Register Bits
Here is a 4 digit counting demo using the pic16f913. Hope it helps
Code:
'PIC16F914 4 Digit LCD Counter Demo
'Purpose to Drive non-inteligent LCD displays with on chip LCD module
'Vishay VM404 LCD 4 digit, 7 segment -mouser elect
'LCD BIAS RESISTER LADDER 3x 47k VCC-VDD
' July 2006 Mark S
'***********************************************************************
DEFINE OSC 4 ' Set Xtal Frequency
CMCON0 =%00000111 'COMPARATOR OFF
ADCON0 =%00000000 'ADC off
'SET LCD REGISTERS
LCDCON = %10010010 'LCD ENABLED,SLEEP-LCD ON,ERR OFF,BIAS ON,CLK F/8192,MUX 1/3
LCDPS = %00110000 ' SEE DATA SHEET
LCDSE0 =%11111111 'SEGMENTS 0-7 ON
LCDSE1 =%00001111 'SEGMENTS 8-11 ON 12-15 OFF
LCDSE2 =%00000000 'SEGMENTS 16 - 23 OFF
'VARIABLES
adval VAR WORD
XCOUNT VAR WORD
TEMPX VAR WORD
ONES VAR byte
TENS VAR byte
HUNS VAR byte
THOU VAR byte
DIG1 VAR BYTE
DIG2 VAR BYTE
DIG3 VAR BYTE
DIG4 VAR BYTE
DP1 VAR BIT
DP2 VAR BIT
DP3 VAR BIT
TRISA = %00000000
TRISB= %00000000
TRISC= %00000000
TRISD= %00000000
TRISE= %00000000
'Clear LCD
XCOUNT = 0
LCDDATA0 = 0 : LCDDATA1=0 : LCDDATA2=0 : LCDDATA3=0
LCDDATA4 = 0 : LCDDATA5=0 : LCDDATA6=0 : LCDDATA7=0
LCDDATA8 = 0 : LCDDATA9=0 : LCDDATA10=0 : LCDDATA11=0
'======================================================================
'MAIN
'-----------------------------------------------------------------------
START:
'Count loop 0 to 9999
TEMPX = TEMPX + 1
XCOUNT = TEMPX
THOU = XCOUNT/1000
XCOUNT = XCOUNT//1000
HUNS = XCOUNT/100
XCOUNT = Xcount//100
TENS = XCOUNT/10
ones = XCOUNT//10
'======================================================================
LCD OUT:
'SEVEN SEG LOOKUP
LookUp ONES,[63,6,91,79,102,109,124,7,127,103,0],DIG4
LookUp TENS,[63,6,91,79,102,109,124,7,127,103,0],DIG3
LookUp HUNS,[63,6,91,79,102,109,124,7,127,103,0],DIG2
LookUp THOU,[63,6,91,79,102,109,124,7,127,103,0],DIG1
LCDDATA6.0 = 1 'Decimal Point
'LOAD LCD REGISTERS
LCDDATA0.4 = DIG4.0 'D4A = LCDDATA0.4
LCDDATA0.3 = DIG4.1 'D4B = LCDDATA0.3
LCDDATA3.3 = DIG4.2 'D4C = LCDDATA3.3
LCDDATA6.4 = DIG4.3 'D4D = LCDDATA6.4
LCDDATA3.5 = DIG4.4 'D4E = LCDDATA3.5
LCDDATA0.5 = DIG4.5 'D4F = LCDDATA0.5
LCDDATA3.4 = DIG4.6 'D4G = LCDDATA3.4
LCDDATA0.6 = DIG3.0 'D3A = LCDDATA0.6
LCDDATA0.2 = DIG3.1 'D3B = LCDDATA0.2
LCDDATA3.2 = DIG3.2 'D3C = LCDDATA3.2
LCDDATA6.6 = DIG3.3 'D3D = LCDDATA6.6
LCDDATA3.7 = DIG3.4 'D3E = LCDDATA3.7
LCDDATA0.7 = DIG3.5 'D3F = LCDDATA0.7
LCDDATA3.6 = DIG3.6 'D3G = LCDDATA3.6
LCDDATA1.0 = DIG2.0 'D2A = LCDDATA1.0
LCDDATA0.1 = DIG2.1 'D2B = LCDDATA0.1
LCDDATA3.1 = DIG2.2 'D2C = LCDDATA3.1
LCDDATA7.0 = DIG2.3 'D2D = LCDDATA7.0
LCDDATA4.1 = DIG2.4 'D2E = LCDDATA4.1
LCDDATA1.1 = DIG2.5 'D2F = LCDDATA1.1
LCDDATA4.0 = DIG2.6 'D2G = LCDDATA4.0
LCDDATA1.2 = DIG1.0 'D1A = LCDDATA1.2
LCDDATA0.0 = DIG1.1 'D1B = LCDDATA0.0
LCDDATA3.0 = DIG1.2 'D1C = LCDDATA3.0
LCDDATA7.2 = DIG1.3 'D1D = LCDDATA7.2
LCDDATA4.3 = DIG1.4 'D1E = LCDDATA4.3
LCDDATA1.3 = DIG1.5 'D1F = LCDDATA1.3
LCDDATA4.2 = DIG1.6 'D1G = LCDDATA4.2
PAUSE 200
'CLEAR LCD REGISTERS
LCDDATA0 = 0 : LCDDATA1=0 : LCDDATA2=0 : LCDDATA3=0
LCDDATA4 = 0 : LCDDATA5=0 : LCDDATA6=0 : LCDDATA7=0
LCDDATA8 = 0 : LCDDATA9=0 : LCDDATA10=0 : LCDDATA11=0
LCDDATA6.0 = 0 'DP
IF XCOUNT = 9999 THEN ZERO_X
GOTO START
ZERO_X: XCOUNT = 0 'Reset counter
GOTO START
End
Re: Definning a VAR for Different Register Bits
Thank you guys. That code gives me some ideas for my own program.
