#include <Wire.h>
#include <MCP3424.h>
#include <math.h>

MCP3424 adc(0x68);

void setup() {

    SerialUSB.begin(57600);

    Wire.begin();

    adc.generalCall(GC_RESET);
}

void show_v(double& value, _ConfReg r) {

    char v[24], buff[48];

    dtostrf(value,8,8,v);
    sprintf(buff, "channel: %d, gain: %d, value: %s", r.ch, 1 << r.pga, v);
    SerialUSB.println(buff);
}

double value;

void loop() {

    for (int i = (int)CH1; i <= (int)CH4; i++) {
        _ConfReg& c = adc.creg[(Channel)i];
        c.bits = { GAINx1, SR12B, ONE_SHOT, (Channel)i, 1 };
        ConvStatus err = adc.read(c.ch, value);
        //while (err != R_OK) ConvStatus err = adc.read(c.ch, value);
        if (err == R_OK) {
            show_v(value, c);
            c.srate = SR18B;
            c.pga = adc.findGain(value);
            err = adc.read(c.ch, value);
            if (err == R_OK) {
                show_v(value, c);
                SerialUSB.println();
            } else 
              SerialUSB.println(" error.");
        } else {
            SerialUSB.print("conversion error: ");
            SerialUSB.println(err);
        }
    }
    asm volatile ("nop");
}

char *dtostrf (double val, signed char width, unsigned char prec, char *sout) {
  asm(".global _printf_float");

  char fmt[20];
  sprintf(fmt, "%%%d.%df", width, prec);
  sprintf(sout, fmt, val);
  return sout;
}