Include dependency graph for twimaster.cpp:
Macros | |
| #define | F_CPU 16000000UL |
| #define | SCL_CLOCK 50000L |
Functions | |
| void | i2c_init (void) |
initialize the I2C master interace. More... | |
| unsigned char | i2c_start (unsigned char address) |
Issues a start condition and sends address and transfer direction More... | |
| void | i2c_start_wait (unsigned char address) |
Issues a start condition and sends address and transfer direction More... | |
| unsigned char | i2c_rep_start (unsigned char address) |
Issues a repeated start condition and sends address and transfer direction More... | |
| void | i2c_stop (void) |
Terminates the data transfer and releases the I2C bus More... | |
| unsigned char | i2c_write (unsigned char data) |
Send one byte to I2C device More... | |
| unsigned char | i2c_readAck (void) |
read one byte from the I2C device, request more data from device More... | |
| unsigned char | i2c_readNak (void) |
read one byte from the I2C device, read is followed by a stop condition More... | |
Macro Definition Documentation
◆ F_CPU
| #define F_CPU 16000000UL |
◆ SCL_CLOCK
| #define SCL_CLOCK 50000L |
Function Documentation
◆ i2c_init()
| void i2c_init | ( | void | ) |
initialize the I2C master interace.
Need to be called only once
- Parameters
-
void
- Returns
- none
◆ i2c_readAck()
| unsigned char i2c_readAck | ( | void | ) |
read one byte from the I2C device, request more data from device
- Returns
- byte read from I2C device
◆ i2c_readNak()
| unsigned char i2c_readNak | ( | void | ) |
read one byte from the I2C device, read is followed by a stop condition
- Returns
- byte read from I2C device
◆ i2c_rep_start()
| unsigned char i2c_rep_start | ( | unsigned char | addr | ) |
Issues a repeated start condition and sends address and transfer direction
- Parameters
-
addr address and transfer direction of I2C device
- Return values
-
0 device accessible 1 failed to access device
◆ i2c_start()
| unsigned char i2c_start | ( | unsigned char | addr | ) |
Issues a start condition and sends address and transfer direction
- Parameters
-
addr address and transfer direction of I2C device
- Return values
-
0 device accessible 1 failed to access device
◆ i2c_start_wait()
| void i2c_start_wait | ( | unsigned char | addr | ) |
Issues a start condition and sends address and transfer direction
If device is busy, use ack polling to wait until device ready
- Parameters
-
addr address and transfer direction of I2C device
- Returns
- none
◆ i2c_stop()
| void i2c_stop | ( | void | ) |
Terminates the data transfer and releases the I2C bus
- Parameters
-
void
- Returns
- none
◆ i2c_write()
| unsigned char i2c_write | ( | unsigned char | data | ) |
Send one byte to I2C device
- Parameters
-
data byte to be transfered
- Return values
-
0 write successful 1 write failed
