STM32fxx I2C mem read issue

[MBish.1]

I am trying to use the HAL driver - HAL_I2C_MEM_READ(....)

The stm32 is the master and there is a slave i2c device that I want to read from.  The I2C transaction goes like this: <start> <dev address> <register that I want to read address> <start> <dev address> <value sent from slave><stop>

Using an Aardvark I can read the register value and I have captured the I2C transaction.  I assume this verifies the hardware.  When I attempt to use the HAL driver I can see an I2C transfer start, but it fails.   The transaction is this: <start> <dev address> <register that I want to read address> <start> <dev address> At this point the ADDR bit is not set in the status register which indicates "No end of address transmission", but this makes no sense because I see the address being sent and the ACK from the slave.  The I2C controller flags AF (acknowledgement failure) next, but I see the pin go low on the 9th bit.   

Working (0xB0 0x03 0xB1 0xC5) 0xC5 is the expected value read from register 0x03: 

Failure (0xB0 0x03 0xB1) :

the last clock pulse is the ACK from the slave. And then HAL_I2C_MEM(...) returns HAL_ERROR and that is from the call I2C_RequestMemoryRead(..) which then calls and fails here:

which then drops down to here where the AF bit is set in hardware:

The hardware is telling me that there is an acknowledgement failure but the logic analyzer is telling there isn't.  Any advice?

I wanted to add I've also tried to use a HAL_I2C_Master_Transmit(...) followed by a HAL_I2C_Master_Receive(...) and that seems to fail in the same way.

[RhSilicon]

Have you tried using another MCU (perhaps Arduino) to test the slave device?

[Foued_KH]

Hello @MBish.1 , 

Could you please specify which STM32 board do you use for the I2C communication ?

Foued

[MBish.1]

It is a custom board.

[MBish.1]

It is a stm32f405 processor.

[Foued_KH]

Try to enable the interrupt and use HAL_I2C_MEM_READ_IT() ; 

Foued

[Foued_KH]

Hello @MBish.1 , 

Any updates?

Foued