HAL_I2C_Master_Transmit always returns != HAL_OK

[STai.2]

I am using STM32 Cube MX to generate 32L443RCTx code.

In function HAL_I2C_Master_Transmit always returns != HAL_OK

Any ideas why?

[waclawek.jan]

And what is on SDA/SCL when observed using oscilloscope/LA?

JW

[STai.2]

Only reply 0x90

SDA/SCL As attached file

[waclawek.jan · Accepted solution]

There's a NAK at the end, i.e. the slave does not answer (it's not present, not connected, not working...)

JW

[STai.2]

Working

Thanks!​