QSPI DDR

[shanxing]

STM32F769I Disc：Is the function of stm32f769i dico's QSPI DDR normal?When I used the ddr mode, I could send data using 1line, but when I used 4line, the device was busy until the timeout error occurred, and the data could not be sent normally.However, when configured in sdr mode, data can be sent normally.

[Tesla DeLorean]

Tend to have to watch the bandwidth of the memory and the dummy cycle setting so the read buffers can pre-load

[shanxing]

I simply send the data, do not consider reading, with 4line ddr can not be sent。

[KDJEM.1]

Hello @shanxing and welcome to the community 🙂,

Please make sure that SSHIFT should be set to QSPI_SAMPLE_SHIFTING_NONE instead of QSPI_SAMPLE_SHIFTING_HALFCYCLE. 

Is the Timeout counter enable?

Could you please share your project?

Thank you.

Kaouthar

[shanxing]

Hello KDJEM.1:

  First, I had set SSHIFT to QSPI_SAMPLE_SHIFTING_NONE  already.

  Second,the timeout error is from QSPI HAL Lirary function "HAL_QSPI_Transmit(hqspi, pData, HAL_QPSI_TIMEOUT_DEFAULT_VALUE)", because of the device flag of BUSY is still setting even after sending all data,so occurring timeout error.

  However,as long as the ddr mode is disabled(sCommand.DdrMode = QSPI_DDR_MODE_DISABLE),the above error will not occur.