pic basic i2c bus does not work
Originally Posted by tamertokgoz
'I try to use sda scl fmc24c512 and pcf8583 on the sda scl line
'but could not read anythıng from eeprom when I push the
'button also the second problem is the lcd shows abnormal
'hour minute day v.s sometimes and shows what it has to
'be sometimes could you help me
'fm24c512 has a2 on chasis a1 and a0 on 5 volt connecttion with 4.7k thanks for help
Code:
DEFINE LCD_DREG PORTB
DEFINE LCD_DBIT 4
DEFINE LCD_RSREG PORTB
DEFINE LCD_RSBIT 2
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 3
DEFINE ADC_BITS 100
DEFINE ADC_CLOCK 3
DEFINE ADC_SAMPLEUS 50
SDA var PORTC.4
SCL var PORTC.3
BTN1 VAR PORTD.0 ' BUTON 1
symbol So = PORTE.0 ' Serial output pin
symbol capture = PIR1.2 ' CCP1 capture flag
symbol overflow = PIR1.0 ' Timer1 overflow flag
TRISA = %11111111
TRISB = %00000001
ADCON1 = %10000010
ADD VAR WORD
ADDO VAR WORD
FX VAR WORD
f2 var word
VOLT VAR WORD
AMPER VAR WORD
y var word
F1 VAR WORD
per var word
fre var word
MS VAR WORD
period VAR WORD ' Word variable that stores the value
sec var byte
mnt var byte
hour var byte
day var byte
month var byte
year var byte
CCP1CON = %00000100 ' Enable the CCP1 capture, falling edge
T1CON = %00000001 ' TMR1 prescale=1, and turn it on (1uS per count)
BOOT:
LCDOut $fe, 1
LCDOut " "
LCDOut $fe,$c0," "
pause 6
ADD =10
loop:
IF (capture = 0) Then loop ' Wait here until captured
period.lowbyte = CCPR1L ' Store the captured value in
period.highbyte = CCPR1H ' period variable
IF overflow = 0 Then ' Skip the output if the timer overflowed
' So=period
goto adcloop
EndIF
capture = 0 ' Clear the capture flag
reset:
IF (capture = 0) Then reset ' Wait for beginning of next period
TMR1L = 0 ' Clear Timer1 low register
TMR1H = 0 ' Clear Timer1 high register
capture = 0 ' Clear capture flag
overflow = 0 ' Clear overflow flag
goto loop
ADCLOOP:
ADCIN 0, VOLT
PAUSE 40
ADCIN 1, AMPER
amper = (amper */ 15)>>2
i2cread SDA,scl,%10100000,2,[sec,mnt,hour,day,month]
CKP =1
year.3 = 1
year.2 = 0
year.1 = day.6
year.0 = day.7
month.5 =0
month.6 =0
month.7 =0
'day.5 =0
day.6 =0
day.7 =0
pause 25
f1 = period / 100
f1 = 10000 / f1
y = 10000/ f1
y = y*100
if y > period then
f2 =">"
else
f2 ="<"
endif
LCDOut $fe, 1
Lcdout hex2(hour),hex2(mnt),hex2(Sec), "-", hex2(day),".", hex2(month),"." , hex2(year)
LCDOut $fe,$c0,"V="
Lcdout dec VOLT
lcdout " I="
Lcdout dec AMPER
LCDOut " F"
Lcdout F2,"=",dec F1
ADD = ADD +1
I2CWRITE SDA,SCL,$A6,ADD,[ADD],BOGUS
PAUSE 50
IF BTN1 THEN OKU
GoTo loop ' Do it forever
OKU :
FOR ADDO =10 TO ADD
I2CREAD SDA,SCL,$A7,ADDO,[FX],BOGUS
PAUSE 25
SEROUT2 So,84,[DEC ADDO ,"--", DEC(FX), 13,10]
PAUSE 50
NEXT
GOTO LOOP
bogus:
LCDOut $fe,1, "timed out" ' I2C command timed out
Pause 1000
RETURN
End
1 Attachment(s)
pic basic i2c bus does not work
Quote:
Originally Posted by
mister_e
This is absolutely imperative you told us which PIC you're using and at which frequency you run it.
I don't see any Config fuses setting either.
Schematic is more than welcome.
pic 16f687
it also does not any help
Quote:
Originally Posted by
mister_e
Check your datasheet for ANSEL and ANSELH register settings.
As you have it now, you have some digital vouched use... but... on analog configured pins.
WOW ISIS...
http://www.mister-e.org/Pics/puke
it also does not any help
