How to use SPIM EasyDMA with nrf52?

RE: How to use SPIM EasyDMA with nrf52?

Ankush — Fri, 13 Jan 2017 11:48:25 GMT

Ok,Ole Thanks once again..

RE: How to use SPIM EasyDMA with nrf52?

Ole Bauck — Fri, 13 Jan 2017 11:34:54 GMT

You mean this case?: devzone.nordicsemi.com/.../

This is handled by my colleagues Petter and Pawel, you should wait for their response.

RE: How to use SPIM EasyDMA with nrf52?

Ankush — Fri, 13 Jan 2017 10:47:59 GMT

Yes, Ole you are right. Now I am using nrf_drv_spi_transfer(..) function to transfer 20 bytes using SPIM. I have initialized the buffer with the value that I want to transfer.Then I have just given that buffer and number of bytes to transfer to above function. As soon as all the bytes gets transferred, I have received the interrupt in the SPI interrupt handler.

Thanks for your support.. I have some another questions regarding SD card writing with BLE and SADC mention [here](link text)` Can you suggest something regarding that...

I want to write to SD card and want to use BLE for streaming at 1000sps

RE: How to use SPIM EasyDMA with nrf52?

Ole Bauck — Fri, 13 Jan 2017 09:56:48 GMT

Hi,

The SPI master code (nrf_drv_spi) will use DMA (SPIM peripheral) if SPIx_USE_EASY_DMA is defined for the corresponding SPI instance (here denoted with x).

Then use the nrf_drv_spi_transfer(..) function to set up the transfer and send data. The tx and rx data will be in the buffers passed into the function.

You can even use the NRF_DRV_SPI_FLAG_HOLD_XFER if you want to setup the transfer, but not start it right away. Then you can for example start the transfer automatically using PPI when saadc is done (if this was what you intend to do?).

Ole