HAL_SPI SPI_DIRECTION_1LINE mode Send 4 more cycles

[xhan.11]

HI：

STM32F103

STM32CUBEMX V4.25.1

As shown in the figure, I read one byte in 1line mode, but sent five bytes, four more than I wanted.

thanks

[TDK · Accepted solution]

That's just how the hardware works in one line receive mode. The clock continues until the peripheral is disabled which takes some time, particularly at high data rates.

You can use two line mode, or use your own drivers to control the peripheral more exactly.

 

[xhan.11]

Thank you for your reply, which solves my problem. Unfortunately, I have to use single line mode.