I implement I2C slave mode at STM32L5x series MCU, Here I have a chances to put NACK token at first receive byte(command code judged),when host issue block read command, But the ACK of first byte receive seems control by HW, Software has no chance to interfered, Because of after the last bit received, SCL turn to low , SDA has already force put to low,it's meaning HW prepare ACK token to Host. So is there any way that I could judge the command code to determine ACK or NACK
