we connected STM32F051 to ASM330 over SPI . The communication works only with Chip select line being toggled LOW as a GPIO line the SPI is not able to set Chip select Low . There is a 10K ohm Pull-Up resistor on the Chip Select Line . What is the suggeste

[ck.1]

Hi ,

We connected STM32F051 to ASM330 over SPI .

The communication works only with Chip select line being toggled LOW as a GPIO line the SPI is not able to set Chip select Low . There is a 10K ohm Pull-Up resistor on the Chip Select Line . What is the suggested solution for the Chip select line to work with SPI and not to use Chip select as GPIO .

[Eleon BORLINI]

Hi @ck.1​ ,

If the master cannot force the SPI CS due to the pull-up resistor, I'm afraid you have to use a GPIO resource.

In theory, you can disable the pull-up via reg command (datasheet p.38), but you need to be able to communicate first with the chip in some way..

-Eleon