refactor, non-working
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parent
76e0d23887
commit
6380f83190
9 changed files with 186 additions and 154 deletions
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@ -19,7 +19,7 @@ void i2c_init(void)
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//TWBR = 10;
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}
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i2c_status_t i2c_start(uint8_t address, uint8_t timeout)
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i2c_status_t i2c_start(uint8_t address, uint16_t timeout)
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{
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// reset TWI control register
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TWCR = 0;
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@ -28,13 +28,13 @@ i2c_status_t i2c_start(uint8_t address, uint8_t timeout)
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uint16_t timeout_timer = timer_read();
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while( !(TWCR & (1<<TWINT)) ) {
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if (timeout && (timer_read() - timeout_timer) > timeout) {
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if (timeout && ((timer_read() - timeout_timer) > timeout)) {
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return I2C_STATUS_TIMEOUT;
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}
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}
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// check if the start condition was successfully transmitted
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if(((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)){ return 1; }
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if(((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)){ return I2C_STATUS_ERROR; }
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// load slave address into data register
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TWDR = address;
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@ -43,19 +43,19 @@ i2c_status_t i2c_start(uint8_t address, uint8_t timeout)
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timeout_timer = timer_read();
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while( !(TWCR & (1<<TWINT)) ) {
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if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
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if (timeout && ((timer_read() - timeout_timer) > timeout)) {
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return I2C_STATUS_TIMEOUT;
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}
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}
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// check if the device has acknowledged the READ / WRITE mode
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uint8_t twst = TW_STATUS & 0xF8;
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if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return 1;
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if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return I2C_STATUS_ERROR;
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return 0;
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return I2C_STATUS_SUCCESS;
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}
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i2c_status_t i2c_write(uint8_t data, uint8_t timeout)
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i2c_status_t i2c_write(uint8_t data, uint16_t timeout)
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{
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// load data into data register
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TWDR = data;
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@ -64,17 +64,17 @@ i2c_status_t i2c_write(uint8_t data, uint8_t timeout)
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uint16_t timeout_timer = timer_read();
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while( !(TWCR & (1<<TWINT)) ) {
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if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
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if (timeout && ((timer_read() - timeout_timer) > timeout)) {
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return I2C_STATUS_TIMEOUT;
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}
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}
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if( (TW_STATUS & 0xF8) != TW_MT_DATA_ACK ){ return 1; }
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if( (TW_STATUS & 0xF8) != TW_MT_DATA_ACK ){ return I2C_STATUS_ERROR; }
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return 0;
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return I2C_STATUS_SUCCESS;
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}
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i2c_status_t i2c_read_ack(uint8_t timeout)
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int16_t i2c_read_ack(uint16_t timeout)
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{
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// start TWI module and acknowledge data after reception
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@ -82,7 +82,7 @@ i2c_status_t i2c_read_ack(uint8_t timeout)
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uint16_t timeout_timer = timer_read();
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while( !(TWCR & (1<<TWINT)) ) {
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if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
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if (timeout && ((timer_read() - timeout_timer) > timeout)) {
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return I2C_STATUS_TIMEOUT;
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}
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}
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@ -91,7 +91,7 @@ i2c_status_t i2c_read_ack(uint8_t timeout)
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return TWDR;
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}
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i2c_status_t i2c_read_nack(uint8_t timeout)
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int16_t i2c_read_nack(uint16_t timeout)
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{
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// start receiving without acknowledging reception
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@ -99,7 +99,7 @@ i2c_status_t i2c_read_nack(uint8_t timeout)
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uint16_t timeout_timer = timer_read();
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while( !(TWCR & (1<<TWINT)) ) {
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if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
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if (timeout && ((timer_read() - timeout_timer) > timeout)) {
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return I2C_STATUS_TIMEOUT;
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}
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}
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@ -108,81 +108,112 @@ i2c_status_t i2c_read_nack(uint8_t timeout)
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return TWDR;
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}
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i2c_status_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length)
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i2c_status_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout)
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{
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if (i2c_start(address | I2C_WRITE)) return 1;
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i2c_status_t status = i2c_start(address | I2C_WRITE, timeout);
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if (status) return status;
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for (uint16_t i = 0; i < length; i++)
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{
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if (i2c_write(data[i])) return 1;
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for (uint16_t i = 0; i < length; i++) {
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status = i2c_write(data[i], timeout);
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if (status) return status;
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}
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i2c_stop();
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status = i2c_stop(timeout);
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if (status) return status;
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return 0;
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return I2C_STATUS_SUCCESS;
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}
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uint8_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length)
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i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout)
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{
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if (i2c_start(address | I2C_READ)) return 1;
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i2c_status_t status = i2c_start(address | I2C_READ, timeout);
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if (status) return status;
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for (uint16_t i = 0; i < (length-1); i++)
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{
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data[i] = i2c_read_ack();
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}
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data[(length-1)] = i2c_read_nack();
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i2c_stop();
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return 0;
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}
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uint8_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length)
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{
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if (i2c_start(devaddr | 0x00)) return 1;
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i2c_write(regaddr);
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for (uint16_t i = 0; i < length; i++)
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{
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if (i2c_write(data[i])) return 1;
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for (uint16_t i = 0; i < (length-1); i++) {
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status = i2c_read_ack(timeout);
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if (status >= 0) {
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data[i] = status;
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} else {
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return status;
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}
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}
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i2c_stop();
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status = i2c_read_nack(timeout);
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if (status >= 0 ) {
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data[(length-1)] = status;
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} else {
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return status;
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}
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return 0;
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status = i2c_stop(timeout);
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if (status) return status;
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return I2C_STATUS_SUCCESS;
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}
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uint8_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length)
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i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)
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{
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if (i2c_start(devaddr)) return 1;
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i2c_status_t status = i2c_start(devaddr | 0x00, timeout);
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if (status) return status;
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i2c_write(regaddr);
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status = i2c_write(regaddr, timeout);
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if (status) return status;
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if (i2c_start(devaddr | 0x01)) return 1;
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for (uint16_t i = 0; i < (length-1); i++)
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{
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data[i] = i2c_read_ack();
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for (uint16_t i = 0; i < length; i++) {
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status = i2c_write(data[i], timeout);
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if (status) return status;
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}
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data[(length-1)] = i2c_read_nack();
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i2c_stop();
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status = i2c_stop(timeout);
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if (status) return status;
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return 0;
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return I2C_STATUS_SUCCESS;
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}
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i2c_status_t i2c_stop(uint8_t timeout)
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i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)
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{
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i2c_status_t status = i2c_start(devaddr, timeout);
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if (status) return status;
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status = i2c_write(regaddr, timeout);
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if (status) return status;
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status = i2c_start(devaddr | 0x01, timeout);
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if (status) return status;
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for (uint16_t i = 0; i < (length-1); i++) {
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status = i2c_read_ack(timeout);
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if (status >= 0) {
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data[i] = status;
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} else {
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return status;
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}
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}
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status = i2c_read_nack(timeout);
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if (status >= 0 ) {
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data[(length-1)] = status;
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} else {
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return status;
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}
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status = i2c_stop(timeout);
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if (status) return status;
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return I2C_STATUS_SUCCESS;
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}
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i2c_status_t i2c_stop(uint16_t timeout)
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{
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// transmit STOP condition
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TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
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uint16_t timeout_timer = timer_read();
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while(TWCR & (1<<TWSTO)) {
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if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
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if (timeout && ((timer_read() - timeout_timer) > timeout)) {
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return I2C_STATUS_TIMEOUT;
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}
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}
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return 0;
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return I2C_STATUS_SUCCESS;
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}
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