To read a word via I2C I need to add a second start condition to the procedure. What would be the easiest way to accomplish this?

[RCooke88]

From the datasheet from the slave device: "First the host must write a command to the slave device. Then it must follow that command with a repeated start condition to denote a read from that device's address. The slave then returns two bytes of data.

Note that there is not a stop condition before the repeated start condition, and that a "Not Acknowledge" signifies the end of the read transfer."

The data format:

S - Device Addr - Wr - A Cmd Code - A - S - Device Addr - Rd - A - Data Byte Low - A - Data High - !A - P

The Slave's responses are underlined.

Any ideas?

Thanks,

Richard

[KnarfB · Accepted solution]

HAL_I2C_Mem_Read(). See https://forum.digikey.com/t/using-the-stm32cube-hal-i2c-driver-in-master-mode/15122#hal_i2c_mem_read-7

hth

KnarfB

[gbm]

Simple: use HAL_I2C_MemoryRead().

[RCooke88]

Thanks. I think that will work. Don't understand why I didn't look at that.