STM32F0 CubeMx SPI HAL Driver Initial Pin Level

[DAkka]

Hi there,

I created a project with STM32F042G6 chip using CubeMX. I am interfacing this IC to another chip using SPI. When I set the SPI1 and try to send a command, just before sending a command I have SCLK, MOSI, and MISO levels are high. After sending byte/bytes these pins stays low. After sending the first transmission IC that I am interfacing can understand all the data I sent. However, this initial high state creates a confusion on the IC I am interfacing.

Is there a way to set the SCLK and MISO Pin levels right after initilize the SPI Hal driver?

Note that I don't want to push dummy byte to SPI bus. I would like to configure it in the way that once SPI is configured

SCLK: Low

MOSI: Low

MISO: Low

Thank you so much!

Deniz

[Pavel A.]

You're forgetting about the Chip Select output to the other chip. Until this is set to active state, the other chip should not react to MOSI and CLK lines.

[TDK]

Assuming the STM32 is the master:

MISO isn't controlled by the STM32.

SCLK can be set to its idle level by enabling the peripheral.

__HAL_SPI_ENABLE(&hspi1);

You can't control MOSI directly.