SPI frequency limit

RE: SPI frequency limit

vn2000 — Wed, 25 Oct 2023 11:25:32 GMT

Hi Kenneth,

I never thought we have to do that. However, the problem is fixed and now I can compile it.

Thank you for your help.

RE: SPI frequency limit

Kenneth — Wed, 25 Oct 2023 10:59:12 GMT

The case you link to says that you should comment out SPI_ENABLED, so for instance:

//#ifndef SPI_ENABLED
//#define SPI_ENABLED 0
//#endif

Please do so.

Kenneth

RE: SPI frequency limit

vn2000 — Wed, 25 Oct 2023 09:33:27 GMT

Enclosed please find the file sdk_config.h

RE: SPI frequency limit

vn2000 — Wed, 25 Oct 2023 09:32:14 GMT

devzone.nordicsemi.com/.../3652.sdk_5F00_config.h

RE: SPI frequency limit

Kenneth — Wed, 25 Oct 2023 07:44:18 GMT

Can you share you sdk_config.h file?

Kenneth

RE: SPI frequency limit

vn2000 — Tue, 24 Oct 2023 13:27:05 GMT

I was able to locate a SPIM3 example here:

SPIM3 on nRF52840 and SDK17.0.2 - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

I downloaded ble_test_spim3.zip and compiled it. But I got the error 'undefined reference to nrfx_spim_init'.

What I don't understand is that I have 'I#define NRFX_SPIM_ENABLED 1' in sdk_config.h, but in nrfx_spim.c everything is grayed out after the line:

#if NRFX_CHECK(NRFX_SPIM_ENABLED)

Therefore nrfx_spim_init is undefined.

RE: SPI frequency limit

Kenneth — Tue, 24 Oct 2023 08:10:27 GMT

Hello,

Try using SPIM3 (SPIM0-SPIM2 only support 8MHz and below), while SPIM3 support up to 32MHz:
https://infocenter.nordicsemi.com/topic/ps_nrf52840/spim.html#topic

Kenneth