SPI slave not working on pins 26,27

RE: SPI slave not working on pins 26,27

RK — Thu, 07 May 2015 13:53:13 GMT

should have no issues whatsoever - remember to change the LF clock source in your softdevice or other LF clock init function to one of the non-crystal ones, then the LF clock will be started with the correct source and it won't expect a crystal on X1/X2

RE: SPI slave not working on pins 26,27

Ryan — Thu, 07 May 2015 13:46:51 GMT

Thank you for the response. That makes sense. On my custom board without a 32.768 kHz crystal should I have any issues using 26 and 27 for SPI or will I need to set something in the firmware?

RE: SPI slave not working on pins 26,27

RK — Thu, 07 May 2015 00:22:11 GMT

You're trying to use P0.26 and P0.27 on the PCA10028? The PCA10028 manual says this

"On the DK board, P0.26 and P0.27 are by default used for the 32.768 kHz crystal and are not available as a GPIO on the connectors."

If you don't want the crystal you can cut SB1/2 and solder SB3/4 to remove it and use the pins as GPIOs, if you're really out of GPIOs to use.