git.zerfleddert.de Git - rsbs2/blob - bmc/i2c.c

   1 #include <util/twi.h>
   2 #include <avr/interrupt.h>
   3 #include <stdio.h>
   4 #include "i2c.h"
   5
   6 #define TWCR_ACK TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|(0<<TWWC);
   7 #define TWCR_NACK TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(0<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|(0<<TWWC);
   8 #define TWCR_RESET TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA)|(0<<TWSTA)|(1<<TWSTO)|(0<<TWWC);
   9
  10 void i2c_init()
  11 {
  12         TWAR = BMC_ADDR;
  13         TWCR &= ~(1<<TWSTA)|(1<<TWSTO);
  14         TWCR|= (1<<TWEA) | (1<<TWEN)|(1<<TWIE);
  15 }
  16
  17 ISR (TWI_vect)
  18 {
  19         printf("Interrupt, Status: %02x!\n", TW_STATUS);
  20
  21         switch (TW_STATUS) {
  22                 default:
  23                         TWCR_RESET;
  24                         break;
  25         }
  26 }