Question about STM32 SPI slave mode-EEWORLD

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There are many questions about using STM32 as a slave on the Internet. The main problem is that the slave receives data incorrectly.

1 About the master and slave clock suspension configuration It can be said with certainty that the master and slave clock suspension must be configured to be the same

This is clearly stated in the official STM manual.

2 The baud rate of the slave is only related to the CLK signal provided by the master.

3 Communication failure or data reception error The problem lies in the slave's judgment of the SPI start signal.

When using TI mode, the NSS signal is easily captured by the hardware slave.

What if there is no NSS signal? Because the STM32 SPI normal mode does not do anything to capture data, it really confuses us.

It just starts capturing when we turn on SPI, regardless of whether SCK is idle or busy at this time, which causes the SPI data we read to be wrong

Solving this problem is also very simple. Just process the SPI signal in the software to get whether the SPI line is busy or idle.

It is basically the timing of capturing the SPI signal

Before we capture, we first check the SPI bus. If the SPI bus is idle, we start SPI to capture data.

If the bus SPI is busy, wait for the bus to be idle before capturing. It has been verified that this method has almost no problem in communication success rate.

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