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i2c_master_write_read_device() function
Perform a write followed by a read to a device on the I2C bus. A repeated start signal is used between the `write` and `read`, thus, the bus is not released until the two transactions are finished. This function is a wrapper to `i2c_master_start()`, `i2c_master_write()`, `i2c_master_read()`, etc... It shall only be called in I2C master mode.
Syntax
esp_err_t i2c_master_write_read_device(i2c_port_t i2c_num,
uint8_t device_address,
const uint8_t* write_buffer,
size_t write_size,
uint8_t* read_buffer,
size_t read_size,
TickType_t ticks_to_wait);
Implemented in ![]()
i2c.c:1093
Return value
- ESP_OK Success - ESP_ERR_INVALID_ARG Parameter error - ESP_FAIL Sending command error, slave hasn't ACK the transfer. - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode. - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.