summaryrefslogtreecommitdiffstats
path: root/drivers/avr/i2c_master.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/avr/i2c_master.c')
-rwxr-xr-xdrivers/avr/i2c_master.c133
1 files changed, 82 insertions, 51 deletions
diff --git a/drivers/avr/i2c_master.c b/drivers/avr/i2c_master.c
index caca2179e..30ea760c9 100755
--- a/drivers/avr/i2c_master.c
+++ b/drivers/avr/i2c_master.c
@@ -19,7 +19,7 @@ void i2c_init(void)
//TWBR = 10;
}
-i2c_status_t i2c_start(uint8_t address, uint8_t timeout)
+i2c_status_t i2c_start(uint8_t address, uint16_t timeout)
{
// reset TWI control register
TWCR = 0;
@@ -28,13 +28,13 @@ i2c_status_t i2c_start(uint8_t address, uint8_t timeout)
uint16_t timeout_timer = timer_read();
while( !(TWCR & (1<<TWINT)) ) {
- if (timeout && (timer_read() - timeout_timer) > timeout) {
+ if (timeout && ((timer_read() - timeout_timer) > timeout)) {
return I2C_STATUS_TIMEOUT;
}
}
// check if the start condition was successfully transmitted
- if(((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)){ return 1; }
+ if(((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)){ return I2C_STATUS_ERROR; }
// load slave address into data register
TWDR = address;
@@ -43,19 +43,19 @@ i2c_status_t i2c_start(uint8_t address, uint8_t timeout)
timeout_timer = timer_read();
while( !(TWCR & (1<<TWINT)) ) {
- if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
+ if (timeout && ((timer_read() - timeout_timer) > timeout)) {
return I2C_STATUS_TIMEOUT;
}
}
// check if the device has acknowledged the READ / WRITE mode
uint8_t twst = TW_STATUS & 0xF8;
- if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return 1;
+ if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return I2C_STATUS_ERROR;
- return 0;
+ return I2C_STATUS_SUCCESS;
}
-i2c_status_t i2c_write(uint8_t data, uint8_t timeout)
+i2c_status_t i2c_write(uint8_t data, uint16_t timeout)
{
// load data into data register
TWDR = data;
@@ -64,17 +64,17 @@ i2c_status_t i2c_write(uint8_t data, uint8_t timeout)
uint16_t timeout_timer = timer_read();
while( !(TWCR & (1<<TWINT)) ) {
- if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
+ if (timeout && ((timer_read() - timeout_timer) > timeout)) {
return I2C_STATUS_TIMEOUT;
}
}
- if( (TW_STATUS & 0xF8) != TW_MT_DATA_ACK ){ return 1; }
+ if( (TW_STATUS & 0xF8) != TW_MT_DATA_ACK ){ return I2C_STATUS_ERROR; }
- return 0;
+ return I2C_STATUS_SUCCESS;
}
-i2c_status_t i2c_read_ack(uint8_t timeout)
+int16_t i2c_read_ack(uint16_t timeout)
{
// start TWI module and acknowledge data after reception
@@ -82,7 +82,7 @@ i2c_status_t i2c_read_ack(uint8_t timeout)
uint16_t timeout_timer = timer_read();
while( !(TWCR & (1<<TWINT)) ) {
- if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
+ if (timeout && ((timer_read() - timeout_timer) > timeout)) {
return I2C_STATUS_TIMEOUT;
}
}
@@ -91,7 +91,7 @@ i2c_status_t i2c_read_ack(uint8_t timeout)
return TWDR;
}
-i2c_status_t i2c_read_nack(uint8_t timeout)
+int16_t i2c_read_nack(uint16_t timeout)
{
// start receiving without acknowledging reception
@@ -99,7 +99,7 @@ i2c_status_t i2c_read_nack(uint8_t timeout)
uint16_t timeout_timer = timer_read();
while( !(TWCR & (1<<TWINT)) ) {
- if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
+ if (timeout && ((timer_read() - timeout_timer) > timeout)) {
return I2C_STATUS_TIMEOUT;
}
}
@@ -108,81 +108,112 @@ i2c_status_t i2c_read_nack(uint8_t timeout)
return TWDR;
}
-i2c_status_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length)
+i2c_status_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout)
{
- if (i2c_start(address | I2C_WRITE)) return 1;
+ i2c_status_t status = i2c_start(address | I2C_WRITE, timeout);
+ if (status) return status;
- for (uint16_t i = 0; i < length; i++)
- {
- if (i2c_write(data[i])) return 1;
+ for (uint16_t i = 0; i < length; i++) {
+ status = i2c_write(data[i], timeout);
+ if (status) return status;
}
- i2c_stop();
+ status = i2c_stop(timeout);
+ if (status) return status;
- return 0;
+ return I2C_STATUS_SUCCESS;
}
-uint8_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length)
+i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout)
{
- if (i2c_start(address | I2C_READ)) return 1;
-
- for (uint16_t i = 0; i < (length-1); i++)
- {
- data[i] = i2c_read_ack();
+ i2c_status_t status = i2c_start(address | I2C_READ, timeout);
+ if (status) return status;
+
+ for (uint16_t i = 0; i < (length-1); i++) {
+ status = i2c_read_ack(timeout);
+ if (status >= 0) {
+ data[i] = status;
+ } else {
+ return status;
+ }
}
- data[(length-1)] = i2c_read_nack();
- i2c_stop();
+ status = i2c_read_nack(timeout);
+ if (status >= 0 ) {
+ data[(length-1)] = status;
+ } else {
+ return status;
+ }
+
+ status = i2c_stop(timeout);
+ if (status) return status;
- return 0;
+ return I2C_STATUS_SUCCESS;
}
-uint8_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length)
+i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)
{
- if (i2c_start(devaddr | 0x00)) return 1;
+ i2c_status_t status = i2c_start(devaddr | 0x00, timeout);
+ if (status) return status;
- i2c_write(regaddr);
+ status = i2c_write(regaddr, timeout);
+ if (status) return status;
- for (uint16_t i = 0; i < length; i++)
- {
- if (i2c_write(data[i])) return 1;
+ for (uint16_t i = 0; i < length; i++) {
+ status = i2c_write(data[i], timeout);
+ if (status) return status;
}
- i2c_stop();
+ status = i2c_stop(timeout);
+ if (status) return status;
- return 0;
+ return I2C_STATUS_SUCCESS;
}
-uint8_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length)
+i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)
{
- if (i2c_start(devaddr)) return 1;
+ i2c_status_t status = i2c_start(devaddr, timeout);
+ if (status) return status;
- i2c_write(regaddr);
+ status = i2c_write(regaddr, timeout);
+ if (status) return status;
- if (i2c_start(devaddr | 0x01)) return 1;
+ status = i2c_start(devaddr | 0x01, timeout);
+ if (status) return status;
- for (uint16_t i = 0; i < (length-1); i++)
- {
- data[i] = i2c_read_ack();
+ for (uint16_t i = 0; i < (length-1); i++) {
+ status = i2c_read_ack(timeout);
+ if (status >= 0) {
+ data[i] = status;
+ } else {
+ return status;
+ }
}
- data[(length-1)] = i2c_read_nack();
- i2c_stop();
+ status = i2c_read_nack(timeout);
+ if (status >= 0 ) {
+ data[(length-1)] = status;
+ } else {
+ return status;
+ }
+
+ status = i2c_stop(timeout);
+ if (status) return status;
- return 0;
+ return I2C_STATUS_SUCCESS;
}
-i2c_status_t i2c_stop(uint8_t timeout)
+i2c_status_t i2c_stop(uint16_t timeout)
{
// transmit STOP condition
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
uint16_t timeout_timer = timer_read();
while(TWCR & (1<<TWSTO)) {
- if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
+ if (timeout && ((timer_read() - timeout_timer) > timeout)) {
return I2C_STATUS_TIMEOUT;
}
}
- return 0;
+ return I2C_STATUS_SUCCESS;
}
generated by cgit v1.2.3-24-g4f1b (git 2.32.0) at 2024-05-14 01:19:49 +0200