Simple SPI

[verulia]

Hello,

I am using nrf9160 and want to test the just simple SPI function. The code that I found from github(https://github.com/Rallare/fw-nrfconnect-nrf/tree/nrf9160_samples/samples/nrf9160/spi c) is old and gives me too many errors. Are there any simple SPI code that I can try in my nrf9160 board in order to test whether I can send a simple data via SPI. I also found spi_flash_at45 however I don't have any device from at45 family to test it so another simple example would be so helpful for me. 

Thank you

[Håkon Alseth]

Hi,

 

Generic test code for nRF5340 can be found here:

https://devzone.nordicsemi.com/f/nordic-q-a/67065/how-to-configure-and-setup-an-spi-device-to-nrf5340/276687

 

I added some small modifications to the above sample, as SPI0 is shared with UART0/TWIM0 etc on nRF9160:

4520.simple_spi_test_nrf9160.zip

 

Kind regards,

Håkon

[verulia]

Hi,

Thank you for the fast reply. I just ran the code however I am always receiving 0 in the RX_recv. Shouldn't the value in RX_recv be similar with TX_sent since this code is just tries to send a value and receive it back as far as I understood? I didn't make any change in the code yet.

Q2:

I want to send data from nrf9160 to an external device, in order to just make a simple test before implementing a flash driver, I want to test the pins and spi, for that I am using scana to check the signals coming from spi ports. My question here is that how can I send my data to scana rather than making a loopback. For instance first I have to ad a chip select for scana, adding ss=<13> to the overlay file can be the first step right? What should I change other than this?

Thank you

[Håkon Alseth]

The sample doesn't send all the time (once per second), are you sure you're triggering on the correct channel, with the correct edge triggering?

[verulia]

I didn't do any triggering, I just connected one port to the ground and other port to clk output. As trial I triggered the output channel of clk port both risinf and falling but result didn't change. 

[verulia]

Hello,

I think I misunderstood the switching part because I just try to switch the pins of mosi and clk in the overlay file by just writing mosi<10> clk<11> however this doesn't work. How can I switch them what is the right way?

Thank you

[Håkon Alseth]

You can use another gpio by setting the .overlay file.

For instance:

&spi3 {
	compatible = "nordic,nrf-spim";
	status = "okay";
	sck-pin = <x>;
	mosi-pin = <y>;
	miso-pin = <z>;
};

 

Where x, y, z are a valid and unused gpio. If it doesn't switch the gpios, try deleting your build folder and re-importing the project.

 

Kind regards,

Håkon

[verulia]

Hi Hakan,

The pins are changed no problem in that part rigth now but still I can't see the rigth signal in the logic analyzer. I adjusted edge triggering with rising edge( also tried with falling and all other triggering options) I see that clk signal seems always high. Not 0-1-0-1 its always one.I played with sampling frequency but it also didn't change the result. I tested the logic analyzer with different chip and I saw 1-0-1-0 clk signal so logic analyzer is working fine. I didn't change the code that you sent me and it is doing loopback so no problem in spi functionality. Then what should I do in this case? I just want to see the clk signal and mosi in this case I thought that just attaching the logic analyzer to those output pins was sufficient to see the outputs am I missing something in this point?

Thank you