SPI Slave Register Reset

[Joseph.Paul]

Posted on April 16, 2018 at 18:37

I have an issue with the SPI slave interface in the ST32ML151. Occasionally, the SPI slave get an extra clock from outside, either because noise or a reset at the master side. I know when this happens. Is there a way to reset the SPI slave shift register other than reconfiguration the whole spi slave interface?

[waclawek.jan]

Posted on April 16, 2018 at 20:00

Probably no.

JW

[Greg Fundyler]

Posted on April 16, 2018 at 23:37

Assuming you are using software slave management rather than hardware slave select, try this:

• Set SPI_CR1_SSI
• Read the DR register to clear the input buffer
• Read the SR register to clear error flags
• Set up for the next data exchange
• Clear SPI_CR1_SSI

[Greg Fundyler]

Posted on April 30, 2018 at 22:08

Did that work for you? Indicating success or failure may help others that stumble across the same issue.