/* p9_2 Generate sine waveform using DAC MCP4725 with Edubase-V2 board */

#include <Wire.h>

const char SLAVEADDR = 0x60;    /* DAC MCP4725 address */

void setup() {
    Wire.begin();               /* initialize I2C */
}

void loop() {
    const unsigned short sinewave[] =
    {2048, 3071, 3821, 4095, 3821, 3071, 2048, 1024, 274, 0, 274, 1024, 2048};

    for (int i = 0; i < 12; i++) {
      /* write to MCP4725 DAC through I2C */
      Wire.beginTransmission(SLAVEADDR);   /* start talking to DAC */
      Wire.write(0x40);                    /* send write DAC register command */
      Wire.write(sinewave[i] >> 4) & 0xFF; /* send high byte data (D13-D4) */
      Wire.write(sinewave[i] << 4) & 0xFF; /* send low byte data (D3-D0) */
      Wire.endTransmission();              /* stop */
    }
}