nrf52 SPIM no MISO response

[Sergy]

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.

OSC2 waveform

3-byte command bitbanging SCK and MOSI lines

[Sergy]

just a standard config:

#define NRF_DRV_SPI_DEFAULT_CONFIG(id)                       \
{                                                            \
    .sck_pin      = CONCAT_3(SPI, id, _CONFIG_SCK_PIN),      \
    .mosi_pin     = CONCAT_3(SPI, id, _CONFIG_MOSI_PIN),     \
    .miso_pin     = CONCAT_3(SPI, id, _CONFIG_MISO_PIN),     \
    .ss_pin       = NRF_DRV_SPI_PIN_NOT_USED,                \
    .irq_priority = CONCAT_3(SPI, id, _CONFIG_IRQ_PRIORITY), \
    .orc          = 0xFF,                                    \
    .frequency    = NRF_DRV_SPI_FREQ_4M,                     \
    .mode         = NRF_DRV_SPI_MODE_0,                      \
    .bit_order    = NRF_DRV_SPI_BIT_ORDER_MSB_FIRST,         \
}

MISO is using GPIO 11 Tried enabling and disabling EASYDMA, didnt change anything