nRF52832: conflict when using SD card and I2S simultaneously

RE: nRF52832: conflict when using SD card and I2S simultaneously

Jørgen Holmefjord — Thu, 25 Oct 2018 12:08:34 GMT

The pins for are only set for SDOUT, MCK and SDIN if theya are not set to NRF_DRV_I2S_PIN_NOT_USED. Both SCK and LRCK are required and will be set.

RE: nRF52832: conflict when using SD card and I2S simultaneously

d.p — Thu, 25 Oct 2018 09:45:26 GMT

OK, this is now solved.

I needed only the SDOUT pin from the I2S driver (set to pin 26), so I had set the LRCK, MCK and SDIN pins equal to NRF_DRV_I2S_PIN_NOT_USED (the SCK pin had still to be set, else the driver was not working).

For some reason, this created interference with several pins, one of them was pin 31, where I could see the I2S clock. Is this a bug of the nRF5 SDK? As soon as I set all the above pins to something else than NRF_DRV_I2S_PIN_NOT_USED, the interference was gone.

RE: nRF52832: conflict when using SD card and I2S simultaneously

Jørgen Holmefjord — Mon, 03 Sep 2018 12:28:43 GMT

No, there should be no issues using EasyDMA. Can you please upload your project (or a minimal example showing the issue) here, and I will debug/have a look at it?

RE: nRF52832: conflict when using SD card and I2S simultaneously

d.p — Mon, 03 Sep 2018 11:16:41 GMT

Hi Jorgen, no it isn't. I am using EasyDMA, I don't know if this is causing any issues?

RE: nRF52832: conflict when using SD card and I2S simultaneously

Jørgen Holmefjord — Mon, 03 Sep 2018 11:15:39 GMT

Is GPIO pin P0.31 used for any pin in the I2S driver configuration?

There should not be any compatibility issues between the I2S and SPI peripherals.