ESP32でMCP3208でanalogread

ESP-WROOM-32とMCP3208でanalogread

コードは下記のやつ。回路図は後ほど書きます。

# include <SPI.h>

# define SPI1_CLK  32
# define SPI1_MISO 33
# define SPI1_MOSI 25
# define SPI1_SS   26

// set SPI freqency 1MHz
# define SPI_CLK 1000000

//uninitalised pointers to SPI objects
SPIClass SPI1(HSPI);
SPISettings spiSettings = SPISettings(SPI_CLK, SPI_MSBFIRST, SPI_MODE1);

void setup() {
  Serial.begin(115200);

  SPI1.begin(SPI1_CLK, SPI1_MISO, SPI1_MOSI, SPI1_SS);

  pinMode(SPI1_SS, OUTPUT);
  pinMode(SPI1_CLK, OUTPUT);
  pinMode(SPI1_MISO, INPUT);
  pinMode(SPI1_MOSI, OUTPUT);

  digitalWrite(SPI1_SS, HIGH) ;
}

void loop() {
  //byte data = 0b01010101;
  byte channel = 0;
  Serial.println(adc_read(0));
  delay(10);
}

int adc_read(uint8_t channel) {

  SPI1.beginTransaction(spiSettings);
  digitalWrite(SPI1_SS, LOW);
  SPI1.transfer(0x06 | (channel >> 2));
  int d1 = SPI1.transfer(channel << 6) ;
  int d2 = SPI1.transfer(0x00) ;
  digitalWrite(SPI1_SS, HIGH);
  SPI1.endTransaction();

  return ((d1 & 0x1F) * 256 + d2);
}