Using two SPIM instances - undefined SCK behavior

RE: Using two SPIM instances - undefined SCK behavior

dpeplinski — Thu, 13 Dec 2018 12:48:50 GMT

I've checked the pins configuration and it looks OK, our bootloader uses only led's pin. For now, I wrote the SPI initialization with registers and a documentation and I set SCK and MOSI pins to High Drive. It looks much better now, but we are still testing the communication.

RE: Using two SPIM instances - undefined SCK behavior

ketiljo — Wed, 12 Dec 2018 13:06:02 GMT

Check the pin definitions and make sure you don't have more than one function pr. pin then.

RE: Using two SPIM instances - undefined SCK behavior

dpeplinski — Wed, 12 Dec 2018 12:51:22 GMT

I am using Decawave DWM1001 module, where nRF is connected with DW internally. Second SPIM instance is connected to logic analyzer right from the module's pinout, no diodes, no resistors. I wrote a sample project for pca10040 devkit, where only SPIM is used (also two instances) and it looks to work nice, so it seems like it is not a problem with SPIM exactly, but rather with other peripherals colliding. I will try to debug it more deeply, with different peripherals initialized.

RE: Using two SPIM instances - undefined SCK behavior

ketiljo — Wed, 12 Dec 2018 12:42:45 GMT

Looks suspiciously as HW problem. Can you post a schematic of the connection between the nRF52 and the DW1000?