| | 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 & 0xfe; |
| | 13 | TWDR = 0x00; |
| | 14 | TWCR &= ~((1<<TWSTA) | (1<<TWSTO)); |
| | 15 | TWCR |= ((1<<TWEA) | (1<<TWEN) | (1<<TWIE)); |
| | 16 | printf("Status: 0x%02x\n", TW_STATUS); |
| | 17 | PORTC = 0x03; |
| | 18 | } |
| | 19 | |
| | 20 | ISR (TWI_vect, ISR_BLOCK) |
| | 21 | { |
| | 22 | printf("Interrupt, Status: 0x%02x, Data: 0x%02x!\n", TW_STATUS, TWDR); |
| | 23 | |
| | 24 | switch (TW_STATUS) { |
| | 25 | default: |
| | 26 | TWCR_ACK; |
| | 27 | break; |
| | 28 | } |
| | 29 | } |
projects / rsbs2 / blame_incremental