M5StickC timer

m5stickc-timer.ino

/* NB: HAT speaker needs to be connected */

#include <M5StickC.h>
#include "esp32-hal-timer.h"

volatile int interruptCounter;
int totalInterruptCounter;

// https://techtutorialsx.com/2017/10/07/esp32-arduino-timer-interrupts/
hw_timer_t * timer = NULL; //Created Hardware Timer
portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;

int timer_secondsX10 = 0;  // TODO: use hw timer instead

float accX = 0;
float accY = 0;
float accZ = 0;

bool started = 0;

void IRAM_ATTR onTimer() {
  portENTER_CRITICAL_ISR(&timerMux);
  interruptCounter++;
  portEXIT_CRITICAL_ISR(&timerMux);
}

const int servo_pin = 26;
int freq = 50;
int ledChannel = 0;
int resolution = 10;

void setup() {
  Serial.begin(115200);

  //Timer
  timer = timerBegin(0,80,true);//(Use timer 0,80Mhz crystal thus set divider of 80 -> (1/(80MHz/80)))
  timerAttachInterrupt(timer,&onTimer,true);//Attach timer function to timer
  timerAlarmWrite(timer,200000,true);//Set alarm to call timer fucntion every 1 second since 1 tick is 1 microsecond, third parameter is for it to repeat it
  timerAlarmEnable(timer);//enable timer
  Serial.println("Start Timer");

  // put your setup code here, to run once:
  M5.begin();
  M5.IMU.Init();
  
  M5.Lcd.setRotation(1);
  M5.Lcd.fillScreen(BLACK);
  M5.Lcd.setCursor(5, 0, 2);
  M5.Lcd.printf("TIMER");

  pinMode(M5_BUTTON_HOME, INPUT);
  pinMode(M5_BUTTON_RST, INPUT);

  ledcSetup(ledChannel, freq, resolution);
  ledcAttachPin(servo_pin, ledChannel);
  ledcWrite(ledChannel, 0);
  
  delay(100);
  
}

void reset_timer() {
  started = 0;
  timer_secondsX10 = 0;
}

void timer_add_minutes(int x) {
  timer_secondsX10 += 60 * x * 10;
}

void loop() {

  M5.Lcd.setCursor(60, 30, 2);
  int rem_seconds = int(timer_secondsX10 / 10) % 60;
  int minutes = floor(timer_secondsX10 / 600);
  M5.Lcd.printf("%2d:%2d", minutes, rem_seconds);
  
  //M5.Lcd.setCursor(30, 61, 2);
  //M5.Lcd.printf(" %.2f %.2f %.2f", accX, accY, accZ);
  
  if (interruptCounter > 0) {
 
    portENTER_CRITICAL(&timerMux);
    interruptCounter--;
    portEXIT_CRITICAL(&timerMux);
 
    totalInterruptCounter++;
 
    Serial.print("An interrupt as occurred. Total number: ");
    Serial.println(totalInterruptCounter);
 
  }

  // Add a minute on a shake
  M5.IMU.getAccelData(&accX,&accY,&accZ);
  if (accX > 2.2 || accY > 2.2 ) {
    timer_add_minutes(1);
    delay(400);  // Delay to avoid twice action
    started = 1;
  }
  
  if(digitalRead(M5_BUTTON_HOME) == LOW){
    timer_add_minutes(5);
    delay(200);  // Delay to avoid "twice press"
    started = 1;
  } else if(digitalRead(M5_BUTTON_RST) == LOW) {
    reset_timer();
  }

  delay(100);

  if(timer_secondsX10 > 0) {
    timer_secondsX10 -= 1;
  } else if(started) {
    // Buzz six times
    for (int16_t i = 0; i < 6; ++ i) {
      ledcWriteTone(ledChannel, 1250);
      delay(100);
      ledcWriteTone(ledChannel, 0);
      delay(20);
      ledcWriteTone(ledChannel, 1300);
      delay(100);
      ledcWriteTone(ledChannel, 0);
      delay(1000);
    }
    started = 0;
  }
  


}