nrf5340 SPI high drive within nRF Connect SDK

RE: nrf5340 SPI high drive within nRF Connect SDK

d_c_h_w — Wed, 22 Mar 2023 15:57:31 GMT

ok thanks for your response.

Apologies, I should have mentioned the version of SDK I was using, which is 1.6.1, which was the latest version during the actual development of our application.

[quote userid="2115" url="~/f/nordic-q-a/97962/nrf5340-spi-high-drive-within-nrf-connect-sdk/416862"]For NCS v1.x, you need to manually set the drive-strength after SPI initialization to get high drive.[/quote]

Having done some debugging of the start up procedure, I see that the intiilaization is called only once, so I should be able to manually set the drrive strength of each pin of the spi with the nrf_gpio_cfg function at a point I know the first initializtion has already taken place.

RE: nrf5340 SPI high drive within nRF Connect SDK

Håkon Alseth — Wed, 22 Mar 2023 15:05:56 GMT

Hi,

Based on your overlay, it looks like you are using NCS v1.X. Newer v2.x uses pinctrl, where you can specify the drive strength of GPIOs given to bus instances. Here's an example:

https://github.com/nrfconnect/sdk-nrf/blob/v2.3.0/boards/arm/nrf5340_audio_dk_nrf5340/nrf5340_audio_dk_nrf5340_cpuapp_common-pinctrl.dtsi#L75

For NCS v1.x, you need to manually set the drive-strength after SPI initialization to get high drive.

Kind regards,

Håkon

RE: nrf5340 SPI high drive within nRF Connect SDK

d_c_h_w — Wed, 22 Mar 2023 12:01:56 GMT

Ideally I would like to be able to specify in the dts overlay file, but when I try and add extra parameters to this they fail to parse properly (cmake)

e.g trying to add thing like

clock-frequency = <32000000>;

sck-frequency = <32000000>;

To this

/* use the high speed spi */
&spi4 {
compatible = "nordic,nrf-spim";
status = "okay";
mosi-pin = <9>;
miso-pin = <10>;
sck-pin = <8>;
};

causes problems, so I presume I am doing it in the wrong way. I have looked atother peoples examples and tried to use this for guidance

https://docs.zephyrproject.org/latest/build/dts/api/bindings/spi/nordic%2Cnrf-spim.html#dtbinding-nordic-nrf-spim