26.1.5.9 i2c_m_async_cmd_read

Async version of read register value from the I2C slave.

int32_t i2c_m_async_cmd_read(
    struct i2c_m_async_desc *const i2c,
    uint8_t reg,
    uint8_t * value
)

This function will read a byte value from a specified reg in the I2C slave device and then return before the last sub-operation is done.

The sequence of this routine is sta->address(write)->ack->reg address->ack->resta->address(read)->ack->reg value->nack->stt

Parameters

i2c

Type: struct i2c_m_async_desc Struct *const

An I2C master descriptor, which is used to communicate through I2C

reg

Type: uint8_t

The internal address/register of the I2C slave device

value

Type: uint8_t *

The value read from the I2C slave device

Type: int32_t

The status whether successfully read from the device