在arduino IDE 開發ESP32使用 SPI.h 注意事項

重點就是

SPI.begin()要做腳位宣告

    hspi = new SPIClass(HSPI);

    hspi->setBitOrder(MSBFIRST);

    hspi->setDataMode(SPI_MODE1);

    pinMode(ADS1220_CS_PIN, OUTPUT); //HSPI SS

    pinMode(ADS1220_DRDY_PIN,INPUT);

    hspi->begin(14,12,13,15);//HSPI_CLK HSPI_O HSPI ID HSPI_SS

   //SCLK, MISO, MOSI, SS

不然真的會被搞很久

不要用範例裡面的SPI通訊方式

hspi->beginTransaction(SPISettings(spiClk, MSBFIRST, SPI_MODE0));

  digitalWrite(15, LOW);

  hspi->transfer(stuff);

  digitalWrite(15, HIGH);

  hspi->endTransaction();

SPI.begin()內有設定腳位的話就當作SPI.transfer在用就好

像下面範例

digitalWrite(ADS1220_CS_PIN,LOW);                         //Take CS low

        delayMicroseconds(100);

        for (int i = 0; i < 3; i++)

        {

          SPI_Buff[i] = hspi->transfer(SPI_MASTER_DUMMY);

        }

        delayMicroseconds(100);

        digitalWrite(ADS1220_CS_PIN,HIGH);