about NRF52832 spi read and write

RE: about NRF52832 spi read and write

hmolesworth — Mon, 06 Jan 2020 17:43:55 GMT

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

RE: about NRF52832 spi read and write

imCort — Mon, 06 Jan 2020 15:04:19 GMT

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?

RE: about NRF52832 spi read and write

awneil — Mon, 01 Jul 2019 09:40:42 GMT

[quote userid="78049" url="~/f/nordic-q-a/49173/about-nrf52832-spi-read-and-write/195563"]I don't know why the levels on MOSI MISO are abnormal[/quote]

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

RE: about NRF52832 spi read and write

tangyu — Mon, 01 Jul 2019 09:00:58 GMT

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

RE: about NRF52832 spi read and write

awneil — Mon, 01 Jul 2019 08:50:42 GMT

So what have you done to investigate why that might be happening?

How To Debug

RE: about NRF52832 spi read and write

tangyu — Mon, 01 Jul 2019 08:41:07 GMT

I measured the current circuit board SPI signal.CLK CS signal is normal.The MISO and MOSI signals are just a high level and then a low level, no waveform of data is generated.

RE: about NRF52832 spi read and write

awneil — Mon, 01 Jul 2019 07:54:15 GMT

So have you used an oscilloscope to see what's actually happening?

What happens if you try these pins on your "development board" ?

RE: about NRF52832 spi read and write

tangyu — Mon, 01 Jul 2019 07:45:50 GMT

嗨，

执行读写操作时，SPI无法正确读写。

数据手册中未发现使用限制。

SPI的读/写将被卡在读/写中，这意味着它无法访问读/写完成中断。

RE: about NRF52832 spi read and write

awneil — Mon, 01 Jul 2019 07:38:13 GMT

[quote userid="78049" url="~/f/nordic-q-a/49173/about-nrf52832-spi-read-and-write"]communication is not normal[/quote]

In what way(s), exactly, is it "not normal" ?

[quote userid="78049" url="~/f/nordic-q-a/49173/about-nrf52832-spi-read-and-write"]Do i need additional configuration when using p0.0 p0.1 as the peripheral IO?[/quote]

Have you checked the Product Specification to see if there are any specific requirements or limitations on amy of those those pins ... ?