ESP-WROOM-02 + MCP3204 でA/D変換

ESP8266_writer03.ino

/*
    ESP-WROOM-02 + MCP3204 でA/D変換
*/

#include <ESP8266WiFi.h>
#include <SPI.h>

#define CS 15

void setup( )
{
  ESP.eraseConfig();
  delay( 500 );

  Serial.begin( 115200 );
  Serial.println( );
  Serial.printf("Serial is %d bps", Serial.baudRate( ) );

  pinMode( CS, OUTPUT );

  SPI.begin( );

  //----- SET SPI MODE -----
  //SPI_MODE_0 (0,0)     CPOL=0 (Clock Idle low level), CPHA=0 (SDO transmit/change edge active to idle)
  //SPI_MODE_1 (0,1)     CPOL=0 (Clock Idle low level), CPHA=1 (SDO transmit/change edge idle to active)
  //SPI_MODE_2 (1,0)     CPOL=1 (Clock Idle high level), CPHA=0 (SDO transmit/change edge active to idle)
  //SPI_MODE_3 (1,1)     CPOL=1 (Clock Idle high level), CPHA=1 (SDO transmit/change edge idle to active)
  SPI.setDataMode( SPI_MODE0 );   // データシート 図6.1

  SPI.setBitOrder( MSBFIRST );  // most-significant bit first
}

int getMCP3204( int iCh )
{
  int highByte, lowByte;

  // Reading a data from MCP3204
  digitalWrite( CS, LOW );
  highByte = SPI.transfer( 0x06 | ( iCh >> 2 ) );
  highByte = SPI.transfer( iCh << 6 );
  lowByte = SPI.transfer( 0x00 );
  digitalWrite( CS, HIGH );

  //  Serial.printf("MCP3204(%d) %02X-%02X ", iCh, highByte, lowByte );

  return ( highByte & 0x0F ) * 256 + lowByte;
}

void loop( )
{
  Serial.printf("MCP3204 Ch0=%4d, Ch1=%4d, Ch2=%4d, Ch3=%4d \n",
                getMCP3204( 0 ) , getMCP3204( 1 ) , getMCP3204( 2 ) , getMCP3204( 3 ) );
  delay( 500 );
}