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?

This topic has been closed for replies.

XZou.1Best answer

Associate II

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.

"If you feel a post has answered your question, please click ""Accept as Solution""."

XZou.1AuthorBest answer

Associate II

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

Sign up