about NRF52832 spi read and write

[tangyu]

Hi,

   I am using NRF52832 for development without bluetooth SDK, NFC and RTC.

   I am using a development board with SPI and a slave device that can communicate normally (using easy dma).

   SCK---p0.29  MOSI---p0.31  MISO---p0.30  CS---p0.6.

   Later we made a circuit board, SPI wiring was changed, the program was not changed, but the interface setting of SPI was changed.

   SCK---p0.0  MOSI---p0.2  MISO---p0.1  CS---p0.12.

    But his communication is not normal, Spi lead pin has been changed.No changes have been made to the program except for the spi pin number setting.Do i need additional configuration when using p0.0 p0.1 as the peripheral IO?I used nrf5_sdk_15.2.0_9412b96

Thanks

[tangyu]

Use oscilloscope to measure the state of SPI four pins.But I don't know why the levels on MOSI MISO are abnormal.

[awneil]

tangyu said:

I don't know why the levels on MOSI MISO are abnormal

So ,again, you need to investigate why that might be happening ...

[imCort]

I have the same problem.

I use P0.0 as MOSI and P0.1 as SCLK, it didn't work fine even if I carefully configured the LFCLK to RC in order to use P0.0 and P0.1 as normal GPIOs.

Is there any hardware bugs for this two pin to use it in SPI mode?

[hmolesworth]

Even though the pins P0.0 and P0.1 might have be configured correctly in the code to not use the crystal, it is worth checking the register in case code elsewhere is overwriting that setting. I use this for special pins:

    // 32kHz Osc pins can be used as GPIOs or 32kHz Oscillator, special case
    if ( (PinId == PIN_XL2) && (NRF_CLOCK->LFCLKSRC & 0x000001) ) return "RTC-OSC-OUT";
    if ( (PinId == PIN_XL1) && (NRF_CLOCK->LFCLKSRC & 0x000001) ) return "RTC-OSC-IN";

    // NFC pins can be used as GPIOs or NFC, special case
    if ( (PinId == PIN_NFC1) && ((NRF_UICR->NFCPINS & UICR_NFCPINS_PROTECT_Msk) == (UICR_NFCPINS_PROTECT_NFC << UICR_NFCPINS_PROTECT_Pos)) ) return "NFC 1";
    if ( (PinId == PIN_NFC2) && ((NRF_UICR->NFCPINS & UICR_NFCPINS_PROTECT_Msk) == (UICR_NFCPINS_PROTECT_NFC << UICR_NFCPINS_PROTECT_Pos)) ) return "NFC 2";

    // Reset pin can be used as GPIOs or nReset, special case
    if ( (PinId == PIN_NRESET)                          // 21
     && (((NRF_UICR->PSELRESET[0] & UICR_PSELRESET_CONNECT_Msk) == (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos))
     &&  ((NRF_UICR->PSELRESET[1] & UICR_PSELRESET_CONNECT_Msk) == (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos))) ) return "nRESET";

In other words break and look at NRF_CLOCK->LFCLKSRC, if the LS-bit is set then SPI will not work on those pins