led.cpp

#include "led.h"
#include "flasher.h"
#include "constants.h"
#include "logger.h"
#include <Arduino.h>

namespace led {
  namespace {
    const uint8_t VCC_PWM = 105; //Value to adjust for optimal 2V output voltage

    //Array keeping track of states
    bool states[constants::NUMBER_OF_LEDS];
  }

  void shiftOut() {
    //Latch Low. VCC high
    digitalWrite(constants::P_LED_VCC, HIGH);
    digitalWrite(constants::P_LED_LATCH, LOW);


    //Shift out
    for (uint8_t i = constants::NUMBER_OF_LEDS; i <= constants::NUMBER_OF_LEDS; i--)  {
      digitalWrite(constants::P_LED_DATA, states[i]);

      //Clock
      digitalWrite(constants::P_LED_CLOCK, HIGH);
      digitalWrite(constants::P_LED_CLOCK, LOW);
    }

    //If data is left on high drop to low, so that the final output voltage is not altered
    digitalWrite(constants::P_LED_DATA, LOW);

    //Latch high. VCC adjust to two volts
    digitalWrite(constants::P_LED_LATCH, HIGH);
    analogWrite(constants::P_LED_VCC, VCC_PWM);

  }

  void turnOn(uint8_t ledNumber) {
    logger::log(logger::TYPE_INFO, "led", "Set led number " + String(ledNumber) + " ON");

    states[ledNumber] = HIGH;
  }

  void turnOff(uint8_t ledNumber) {
    logger::log(logger::TYPE_INFO, "led", "Set led number " + String(ledNumber) + " OFF");

    states[ledNumber] = LOW;
  }

  void setup() {
    pinMode(constants::P_LED_VCC, OUTPUT);
    pinMode(constants::P_LED_DATA, OUTPUT);
    pinMode(constants::P_LED_CLOCK, OUTPUT);
    pinMode(constants::P_LED_LATCH, OUTPUT);
  }
}