nRF 52840 SPIM instance

RE: nRF 52840 SPIM instance

JasonZK — Mon, 04 Jul 2022 20:14:26 GMT

Hey Jared. SPIM is now working. It seems that link 53 and 54 has to be commented out as well for the program to work. Thanks for the help!

RE: nRF 52840 SPIM instance

JasonZK — Mon, 04 Jul 2022 16:32:05 GMT

[quote userid="73165" url="~/f/nordic-q-a/89538/nrf-52840-spim-instance/375274"]Does it return any error codes? Can you specify what you mean by didn't work[/quote]

It compiles fine. There are no error codes. The code above basically flash a LED if the WHO_AM_I value is correct. It worked using SPIM instance 3 and DCX, but after switching to other instances (I'm using instance 0 as a test) and changing DCX to nrfx_spim_xfer (also deleted the 15 at the end so that it compiles), the LED simply doesn't flash.

[quote userid="73165" url="~/f/nordic-q-a/89538/nrf-52840-spim-instance/375274"]is there any activity on the SCLK[/quote]

The SCK simply toggles to high for all SPIM instances, whenever the LED is blinking correctly or not blinking at all.

[quote userid="73165" url="~/f/nordic-q-a/89538/nrf-52840-spim-instance/375274"]

This feature isn't supported on the other instances so you shouldn't use that for instance 0-2.

[/quote]

I also changed the dcx pin on line 52 to NRFX_SPIM_PIN_NOT_USED, which doesn't really have any effect on the results.

Thanks for the help.

RE: nRF 52840 SPIM instance

Jared — Mon, 04 Jul 2022 09:43:26 GMT

[quote user="JasonZK"]By DCX, do you mean line 73 in the code? I tried modify that to nrfx_spim_xfer() but it wouldn't work even with SPIM instance 3, which used to work. I[/quote]

Strange that it didn't work. Does it return any error codes? Can you specify what you mean by didn't work, is there any activity on the SCLK?

[quote user="JasonZK"] As for the DCX pin at line 52 in spi_init, I didn't use the pin at all, so I doubt changing it would make a difference anyway.[/quote]

This feature isn't supported on the other instances so you shouldn't use that for instance 0-2.

regards

Jared

RE: nRF 52840 SPIM instance

JasonZK — Fri, 01 Jul 2022 17:35:14 GMT

Hey Jared, thank for such rapid reply! I appreciate the help. By DCX, do you mean line 73 in the code? I tried modify that to nrfx_spim_xfer() but it wouldn't work even with SPIM instance 3, which used to work. I also tried changing the USE_EASY_DMA in sdk_config.h, which also doesn't help. As for the DCX pin at line 52 in spi_init, I didn't use the pin at all, so I doubt changing it would make a difference anyway.

RE: nRF 52840 SPIM instance

Jared — Fri, 01 Jul 2022 11:55:01 GMT

Hi,

DCX functionality is only supported with SPIM3, can you try to use nrfx_spim_xfer() instead?

regards

Jared