ESP8266 Community Forum

[RichardS]

- Thu Apr 21, 2016 9:36 am #45929 Just found this in SPI.c

Code: Select allvoid SPIClass::setDataMode(uint8_t dataMode) {

    /**
     SPI_MODE0 0x00 - CPOL: 0  CPHA: 0
     SPI_MODE1 0x01 - CPOL: 0  CPHA: 1
     SPI_MODE2 0x10 - CPOL: 1  CPHA: 0
     SPI_MODE3 0x11 - CPOL: 1  CPHA: 1
     */

    bool CPOL = (dataMode & 0x10); ///< CPOL (Clock Polarity)
    bool CPHA = (dataMode & 0x01); ///< CPHA (Clock Phase)

    if(CPHA) {
        SPI1U |= (SPIUSME);
    } else {
        SPI1U &= ~(SPIUSME);
    }

    if(CPOL) {
        SPI1P |= 1<<29;
    } else {
        SPI1P &= ~(1<<29);
        //todo test whether it is correct to set CPOL like this.
    }

}

Also see https://github.com/reiyawea/Arduino/blo ... /SPI/SPI.h for all the SPI Classes and functions you can call, there is SPISettings which can set the mode and freq.

RichardS

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