Why the number of data I sent is wrong when using HAL_SPI_TransmitReceive() ?

HAL_SPI_TransmitReceive(&hspi1,tx_sensor_data,rx_sensor_data,8,0);

I want sent 8bytes, but only 2bytes sent, why?

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Best answer by XZou.1

I solved it. The general set is wrong. Must set 8 bits not 4bits or 2bits

You have a timeout of 0, which may be the issue. If you want it to be blocking, use HAL_MAX_DELAY.

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XZou.1AuthorBest answer

Associate II

I solved it. The general set is wrong. Must set 8 bits not 4bits or 2bits

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