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I2C problem

 
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jaethelegend
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I2C problem
PostPosted: Fri Jun 19, 2009 9:45 pm     Reply with quote
hi. I am trying to use hardware I2C and it is giving me trouble

Code:
#include<C:\Documents and Settings\Microsoft\My Documents\PIC\project1\I2C ADC\16f886.h>
#include<C:\Documents and Settings\Microsoft\My Documents\PIC\project1\I2C ADC\def_16f886.h>

#fuses intrc_io

#use delay(clock = 1000000)

#use I2C(Force_sW,Master,SDA=PIN_C4,SCL=PIN_C3, slow)

int8 low_buffer = 7;
int8 high_buffer = 8;
int8 config;
int16 adc_in = 9;

void main(void){
   
   osccon = 0x41;
   //Use general call ADC
   i2c_start();
   i2c_write(0x00);//general call
   i2c_write(0x06);//reset command
   i2c_stop();
   //first, configure ADC
      
      i2c_start();
   
      i2c_write(0xD0); //write mode

      //16bit, continuous conversion, PGA = 1V/V
      i2c_write(0x14);
   
      i2c_stop();
   
   while(1){
      i2c_start();
   
      i2c_write(0xD1);//Read mode
   
      delay_ms(10);
      high_buffer = i2c_read();
      delay_ms(10);

      low_buffer = i2c_read();
      delay_ms(10);
      config = i2c_read();
      delay_ms(10);
      i2c_stop();
      high_buffer&=0x7F;
      adc_in = high_buffer;
      adc_in <<= 8;
      adc_in += low_buffer;
   
   
      
      }
   }
      
      

Whenever I put FORCE_HW option instead of force_SW, the program locks up at #use I2c (ie, whenever I halt using debugger, the program is there).
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Jun 19, 2009 11:25 pm     Reply with quote
Please don't start multiple threads on the same problem.
Read other posts about common problems when writing an i2c driver:
http://www.ccsinfo.com/forum/viewtopic.php?t=37398
http://www.ccsinfo.com/forum/viewtopic.php?t=35128
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