#include "Arduino.h"

#include "Metro.h"

#include "ads1210.h"
#include "led.h"
#include "SimpleModbusSlave.h"

const uint8_t LED_PIN = 8;
const uint8_t ADC_CS_PIN = 9;
const uint8_t ADC_RDY_PIN = 7;
const uint8_t MODBUS_TX_ENABLE_PIN = 6;
const uint8_t MODBUS_ID = 3;

ADS1210 ads1210;
LED led;
Metro secondTick = Metro(1000);
uint32_t uptimeSeconds;


struct {
	union {
		uint32_t in;
		uint16_t modbusRegisters[2]; // 0, 1
	} adcValue;
	union {
		uint32_t in;
		uint16_t modbusRegisters[2]; // 2, 3
	} uptimeSeconds;
} modbusHoldingRegisters;


void setup() {  
  led.begin(LED_PIN);
  ads1210.begin(ADC_CS_PIN, ADC_RDY_PIN);
  modbus_configure(&Serial, 1200, SERIAL_8N2, MODBUS_ID, MODBUS_TX_ENABLE_PIN, 
                   sizeof(modbusHoldingRegisters), modbusHoldingRegisters)
  uptimeSeconds = 0;
}

void loop() {
  modbus_update();

  ads1210.exec();
  modbusHoldingRegisters.adcValue.in = ads1210.value;

  if (secondTick.check() == 1) {
    led.toggle();
	uptimeSeconds++;
	modbusHoldingRegisters.uptimeSeconds.in = uptimeSeconds;
  }
}