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nrf52 SPIM no MISO response

Hi,

Im trying to connect MCP25625 via SPI on nrf52. I checked with the scope that CS, MOSI and SCK are correct, but I get no reply on MISO line whatsoever. I perform a very easy operation:

  1. Reset - send 1 byte data
  2. Read register - send 3 bytes.

Any ideas what to check? i have 2 custom boards and they both have the same issue.

image description OSC2 waveform

image description 3-byte command bitbanging SCK and MOSI lines

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