Initializing device for SPI Communication (nRF5340)

[BoldlyVenturing]

I'm using Segger Embedded Studio version 1.6.0 to try to do some testing with SPI for a future project. Currently I am adding SPI functionality to the "Blinky" example: 7206.blinky.zip   I got the basic form of the way I'm trying to do SPI from another post on this forum: nRF5340 - P0.10 not working as SPIM MISO on non-secure build - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)   The problem I am running into is that the "device_get_binding(spiName) line is returning NULL, and I cannot figure out why that is or what to do to fix it. 

I have been looking around, and have found some examples of using SPI, but I am somewhat new to this and therefore am having a hard time understanding them. So I'm wondering how exactly one initializes SPI communication on the nRF5340-DK. Thanks you.

[Øivind]

Hi,

You have a few mistakes in your files. It's not even building for me.
Try with these instead:

prj.conf:

CONFIG_GPIO=y

CONFIG_SERIAL=y
CONFIG_UART_INTERRUPT_DRIVEN=y

# SPI
CONFIG_SPI=y
CONFIG_SPI_NRFX=y
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_SPI_1_NRF_ORC=0xff

nrf5340dk_nrf5340_cpuapp.overlay (change the file name to the same as the board):

&spi1 {
	compatible = "nordic,nrf-spim";
	status = "okay";
	mosi-pin = <4>;
	miso-pin = <5>;
	sck-pin = <6>;
};

main.c (line 42-44):

static void spi_init(void) {
     const char* const spiName = "SPI_1";
     spi_dev = device_get_binding(spiName);

[BoldlyVenturing]

I've made the changes you recommended, though I'm not entirely sure what you mean by "change the file name to the same name as the board" (I'm using a nRF5340-DK). There is still a failure to initialize the SPI.8228.blinky.zip

[Øivind]

I apologize, I should have been more clear. Your overlay files have an extra underscore in their names, it should be nrf5340dk_nrf5340_cpuapp and nrf5340dk_nrf5340_cpuappns, like it is written in the name of the build folder.

nrf5340_dk_nrf5340_cpuapp will not work.

[BoldlyVenturing]

Ok, I've made that change, but the device is still failing to initialize, and the LED is blinking at a much faster rate then it should be. 

[Øivind]

Here are the overlays with the correct names, try with these.

blinky_overlays.zip

[BoldlyVenturing]

It is still having trouble connecting.

5327.blinky.zip

Something I noticed in the course of further testing is that if I put a breakpoint on line 44 (  spi_dev = device_get_binding(spiName);) then it is listed as not having any code, could that be part of the issue?

[Øivind]

Looks like the changes to the overlay haven't been applied.

When you make changes to config or overlay files you need to click "Project"->"Run CMake" in Segger Embedded Studio, or re-open the project using "File"->"Open nRF Connect SDK Project".

If that doesn't work try also ticking "Clean Build Folder" when opening the project.