nrf52840 QSPI flash performance

[nononoidea]

1. I am trying to test the QSPI flash performance in nrf52840_DK  ,but the QSPI init failed because of the event ready check,can i turn off the event check process?

2.  I cant found any  configuration  item  about  QSPI easy_dma   in sdk_config.h?what the DMA depth about QSPI easy_dma? is there any easy_dma configuration item in sdk_config.h?

[Simonr]

Hi

I'm sorry, but I don't understand what command or operation you're referring to, can you please specify what step you want to skip in the QSPI example?

Best regards,

Simon

[nononoidea]

1. In the init fuction nrfx_qspi_init, nrf_qspi_task_trigger(NRF_QSPI, NRF_QSPI_TASK_ACTIVATE), the activity  operation actually send  command 5 to the external flash, can I just ignore this operation ? I mean do not  call nrf_qspi_task_trigger(NRF_QSPI, NRF_QSPI_TASK_ACTIVATE)

[Simonr]

Why do you want to skip it? I haven't tested, but I don't think you can, as it is called in order to activate the QSPI interface.

Best regards,

Simon

[nononoidea]

1.  I have been  testing the new flash chip ,but it always failed in the init phase after the activate operation, in the demo ,the  nrfx_qspi_init always return NRFX_ERROR_TIMEOUT, so I want to know how nrf52840 judge  event  ready after activate(the nrf52840 send command 5)? is it about receive some special data ?

2. I tested the nrf52840-DK  QSPI flash performance in the SDK QSPI example code , found that  the flash read rate is about  10MB/s ,but the datasheet tells it up to 16MB/s, Is there anything else that we should pay special attention to ?