SPI MOSI & MISO problems

RE: SPI MOSI & MISO problems

Franco Fischer — Thu, 21 Jan 2021 17:38:29 GMT

Thanks for your help! I found the error, the pin 6 is used by the UART in the nrf_log of the SDK.

I disabled the nrf_log and the UART in the sdk_config.h and works fine!

Thanks for your time and help!

RE: SPI MOSI & MISO problems

hmolesworth — Thu, 21 Jan 2021 16:49:29 GMT

Most likely you have a pin defined elsewhere, often some kind of default serial port. A tip is to search for all pins in all projects using the typical sdk_config.h format:

#define BLAH_BLAH_PIN   6
                      ^
                      |
variable number of spaces and tabs

You can search for all these in SES using a regular expression search; in the search box (ctrl-shift-f) check the "Regular Expression" and "Search Dependencies" boxes then search for the following:

_PIN[ *\t*]6

This will list all definitions where pin 6 is used by ignoring multiple spaces and tabs between _PIN and the pin number you are checking, 6 in this case.

blahblah\sdk_config.h:#define HCI_UART_TX_PIN 6

Edit: Also maybe search for "_PIN_MAP"

RE: SPI MOSI & MISO problems

Franco Fischer — Thu, 21 Jan 2021 16:19:40 GMT

I do more measuraments. I'm seeing a extrange behavior on MOSI pin, in the oscilloscope I see that the MOSI pin toggle at low frequency (about 16kHz). I disconnect my sensor and I see the same behavior. I attach the oscilloscope capture:

If I use another pin (I try with P1.09) works fine. I attach the oscilloscope capture:

Thanks!

RE: SPI MOSI & MISO problems

Franco Fischer — Thu, 21 Jan 2021 12:22:04 GMT

Hi! I have a define on custom_board.h:

#define LED_1 NRF_GPIO_PIN_MAP(1, 10) // Blue

I have a little experience on Nordic, but I never use the SPI...

The example need extra configuration on the sdk_config.h ?

thanks!

RE: SPI MOSI & MISO problems

haakonsh — Thu, 21 Jan 2021 09:45:26 GMT

That seems fine, I'd double check the pin mappings though.

What pin is LED_1 configured to use?