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I2C: 18f2550 master and 30f3013 slave, won't work

 
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daraos



Joined: 16 Oct 2008
Posts: 18
Location: Chile

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I2C: 18f2550 master and 30f3013 slave, won't work
PostPosted: Wed Sep 15, 2010 8:43 am     Reply with quote
I'm using a PIC18f2550 as a master and a dsPIC30f3013 as a slave, and the interrupt in the slave never triggers.

I started 2 new projects leaving the code at its bare minimum.
The oscilloscope shows the data and the clock correctly, but the pin_f6 never goes high. I've tried with force_hw and force_sw in the master.

This is the code for the master:
Code:

#include<18F2550.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN,nomclr, put
#use delay(clock=48000000)
#use i2c(master, I2C1, slow, force_hw)

void main(){
    byte data_i2c;
    while(TRUE){
        i2c_start();
        i2c_write(0xB0);
        i2c_write(data_i2c);
        i2c_write(0x00); //dummy, segundo byte que se envia a dspic
        i2c_start();
        i2c_write(0xB1);
        data_i2c=i2c_read(0);
        i2c_stop();

        delay_ms(5000);
    }
}


and the code for the slave:
Code:

#include<30f3013.h>
byte channel,cama;
#fuses frc_pll16, nowdt, nodebug, nomclr, nobrownout, noprotect
#use i2c(SLAVE, I2C1, address=0xB0, force_hw)

#INT_SI2C
void ssp_interupt ()
{
   BYTE state, incoming;
   state = i2c_isr_state();
   output_high(pin_f6); //to check if the interrupt triggers
   if(state <= 0x80){                     //Master is sending data
      incoming = i2c_read(0);
      if(state == 1){                     //First received byte is address
         channel = incoming;
      }
      else if(state == 2){                     //Second received byte is data
         cama = incoming;
      }
   }
   if(state == 0x80){                     //Master is requesting data
      i2c_write(0x55);
   }
}

void main(){
   //initial setup
   output_low(pin_f6);
   enable_interrupts(INT_SI2C);
   enable_interrupts(INTR_GLOBAL);
   while(TRUE){}
}


I have 3 days now trying to solve this, please help!
daraos



Joined: 16 Oct 2008
Posts: 18
Location: Chile

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PostPosted: Thu Sep 16, 2010 10:41 am     Reply with quote
I don't know why, but I solved it changing the Master Address to 0x60, and the Slave answer at the address 0xB0. Really weird, probably because I'm using a invalid address for the slave or something like that. I'll look into it once I'm finished with the project.

Also, in the slave's interrupt routine, I changed

Code:
   if(state <= 0x80){                     //Master is sending data

with
Code:
   if(state < 0x80){                     //Master is sending data

and works perfectly
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