MISO Line Misbehaving, no data received

RE: MISO Line Misbehaving, no data received

Alex Ross — Thu, 21 Jan 2021 22:39:17 GMT

Found the probem. Looking closer at the pins, they needed to be offset onto a different port.

#define CS_PIN NRF_GPIO_PIN_MAP(0,12)
#define MISO_PIN NRF_GPIO_PIN_MAP(0,4)
#define MOSI_PIN NRF_GPIO_PIN_MAP(1,8)
#define CLK_PIN NRF_GPIO_PIN_MAP(1,9)

RE: MISO Line Misbehaving, no data received

Alex Ross — Thu, 21 Jan 2021 19:27:12 GMT

Here's the code referenced from my last point. My best guess is I'm missing something in sdk_config.h devzone.nordicsemi.com/.../SPI-Master_5F00_Slave.zip

RE: MISO Line Misbehaving, no data received

Alex Ross — Thu, 21 Jan 2021 19:13:58 GMT

I've whipped up the demo SPI/SPIM examples for use with the 833 board and there was no activity at all on any of the lines. Is there a better demo specifically for the 833 that will work? Maybe a hex so that I can verify both and rule out my system? This was two 833 DK boards talking to each. It's really starting to feel like version 17 doesn't work with SPI/833. I've tried a lot of variations of the example code and still nothing.

RE: MISO Line Misbehaving, no data received

Alex Ross — Thu, 21 Jan 2021 12:30:13 GMT

Thanks for the reply. Here's the readout of the registers. The inst index looks wrong to me. Is my pin assignment correct? Also what is the recommended baud rate for the SPI bus?

On the DK I don't get the blip at all. The signal does look a bit choppier as well. I see on other threads there are resistors you're supposed to remove for that functionality to work, is that true of the 833-DK?

RE: MISO Line Misbehaving, no data received

haakonsh — Thu, 21 Jan 2021 09:36:14 GMT

Can you replicate the problem on the nRF52DK?

Can you enter a debug state, halt the cpu after you've initialized the SPIS, then read out the SPIS registers?