How to debug if the SPI initialization successfully or not

[Ree Wang]

Hi DevZone, 

I am working on a project using nRF52840 preview DK and Arduino CAN Bus shield. I modified source code base on some Git Projects. It seems the SPI initialization is succeeded, however, when I send the message from nRF52 to Shield, Shield always return '0'. 

I am not sure the SPI initialization is succeeded or not, how can I check it? Is there any API which I can use to check the SPI setting status such as PIN number and configuration status?

Kind regards

[Akhil Bhargav Josyabhatla]

I would prefer to do a loop-back test before proceeding to check at the slave's end. Connect MISO and MOSI and see if you can read the data you're trying to send out. 

Loop-back tests always clears out many basic/fundamental confusions. 

[Ree Wang]

Thanks Akhil, Loop-back test is very useful.

Regarding my loop-back test result, I created a new ticket as below. It will be very appreciated if you have any comments on that ticket.

devzone.nordicsemi.com/.../spi-loop-back-test-analysis