wireless_temp_sensor_receiver/wireless_temp_sensor_receiver.ino

#include "queue.h"

boolean disableRx = true;

const int rxPinA      = 7;  // RX, Connected to pin 7

//********************************************************************
//                              SETUP
//********************************************************************
void setup() {
  
  disableRx = true;

  pinMode(rxPinA, INPUT);
    
  Serial.begin(9600);  // USB Serial

  rcvInitQueue();
  
  cli(); // Clear interrupt
  setup_timer_interrupt();
  sei(); // Enable interrupt
  
  disableRx = false;
}

//********************************************************************
//                       INTERRUPT FUNCTIONS
//********************************************************************

void setup_timer_interrupt()
{
  //set timer1 interrupt at 20Hz
  TCCR1A = 0;// set entire TCCR1A register to 0
  TCCR1B = 0;// same for TCCR1B
  TCNT1  = 0;//initialize counter value to 0
  // set compare match register for 1hz increments
  
  //  OCR1A = 40. This results is 16MHz / 8 / 40 = 20 uS between interrupts
  OCR1A = 40;

  // turn on CTC mode
  TCCR1B |= (1 << WGM12);

  // Set CS12:CS10 to 010 = /8 prescaler
  TCCR1B |= (1 << CS11);  
 
  // enable timer compare interrupt
  TIMSK1 |= (1 << OCIE1A);
}  

// 20uS timer interrupt function
ISR(TIMER1_COMPA_vect,ISR_NOBLOCK) {
  
    static unsigned char currValue = 0;
    static unsigned short samples = 0;
    static unsigned short newSamples = 0;
    
    // Sample the pin value
    unsigned char value = digitalRead(rxPinA);

    if( value == currValue ) {
        samples++;
        samples+=newSamples;
        newSamples=0;
    }
    else {
        newSamples++;
    }

    if( newSamples == 3 ) {
        uint16_t queSamples = (uint16_t)((samples*20 > 60000)? 60000 : samples*20);
        rcvEnQueue(queSamples); // Max 46000
        samples = newSamples;
        newSamples = 0;
        currValue = value;    
    }
}

void stopInterrupts() {
    EIMSK &= 0xFC;      // Clear bit 1:0 in Enable Interrupt register
}

//********************************************************************
//                           LOOP
//
//********************************************************************
#define SER_RX_MODE_WAIT 0
#define SER_RX_MODE_RCV 1
#define SER_RX_MODE_END 2

extern unsigned long x_data; // Receive data from Nexa
extern unsigned long temp1_x_data; // Receive data from temp1

void loop() {
    
  static boolean firstRun = true;

  static uint16_t width;
  
  unsigned long now = millis(); // Get the current time
  
  
  // Display version information 10 sec after startup
   if( firstRun == true && now > 30000 ) {
    Serial.println("433MHz Temp sensor receiver (Sparkfun Pro Micro) Ver: 180204 09:35");
    firstRun = false;
  }
  
  if( rcvDeQueue(&width) ) {
    
        
  }
  
}