33 lines
662 B
C
33 lines
662 B
C
#include "i2c.h"
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void i2c_init() {
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TWBR = I2C_BITRATE;
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}
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void i2c_start() {
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TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN);
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while (!(TWCR & (1 << TWINT)));
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}
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void i2c_stop() {
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TWCR = (1 << TWINT) | (1 << TWSTO) | (1 << TWEN);
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while (TWCR & (1 << TWSTO));
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}
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void i2c_write(uint8_t data) {
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TWDR = data;
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TWCR = (1 << TWINT) | (1 << TWEN);
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while (!(TWCR & (1 << TWINT)));
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}
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uint8_t i2c_read_ack() {
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TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWEA);
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while (!(TWCR & (1 << TWINT)));
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return TWDR;
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}
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uint8_t i2c_read_nack() {
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TWCR = (1 << TWINT) | (1 << TWEN);
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while (!(TWCR & (1 << TWINT)));
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return TWDR;
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} |