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PCD: i2c trouble

 
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george



Joined: 14 Mar 2008
Posts: 10

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PCD: i2c trouble
PostPosted: Fri May 08, 2009 2:51 pm     Reply with quote
Hello all

I have converted from a pic 18 series part to a dsp30F5011 part. I am using 3 DACS MCP4725 base part address 00x

we are using the same code but are unable to get the DAC to work. I have tried reading the SDA and SCL with a 100 Mhz scope and are unable to see any bus signals. Is there any differences between 16 bit parts and 8?

Here is the key source code:
Code:

#use delay(clock=10000000)
#fuses XT,NOPROTECT,BROWNOUT,BORV27,NOWDT,PUT64,MCLR

#use I2C(MASTER, scl=PIN_G2, sda=PIN_G3, FAST=10000000, NOFLOAT_HIGH )

#separate
   void dac_i2c(unsigned int16 resvalue){ 
   int j;
   int k;   
    j = make8(resvalue,1);
    k = make8(resvalue,0);
   //output_high(relay);
   i2c_start();   
   i2c_write(194);                        // Device address
   i2c_write(j);                          // Internal Device address   
   i2c_write(k);                          // Resisitor value   
   i2c_stop();                            // Stop condition
   DELAY_uS(10);
   }   

#separate
   void test_dacs(){
   while(true){
   output_high(RELAY);
   output_low(A01);   
   output_low(A02);
   output_low(A03);
   delay_us(50);
   output_high(A01);    //select dac 1
   dac_i2c(409);
   delay_us(50);
}
 }


Thanks Geo
george



Joined: 14 Mar 2008
Posts: 10

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PostPosted: Fri May 08, 2009 3:20 pm     Reply with quote
compiler version 4.092
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