meter_task.c

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/* This file has been prepared for Doxygen automatic documentation generation.*/
#include "meter.h"


uint8_t rtc_flag = 0, key_flag=0;
uint8_t magnetic_tamper_flag = 0;
uint8_t cover_open_flag = 0;
void tamper_check(void)
{
  uint16_t Irms_tamper_low, Irms_tamper_high;
  static uint8_t rev_current = 0, earth_fault = 0;
  Irms_tamper_low = Irms[0] - ((Irms[0]*64)>>8);            
  Irms_tamper_high = Irms[0] + ((Irms[0]*64)>>8);
  if ((Nrms < Irms_tamper_low) | (Nrms > Irms_tamper_high))
  {
    earth_fault++;
  }
  else
  {
    earth_fault = 0;
  }
  if(earth_fault > 15)      //checking for 15 seconds
  {
    PORTB.OUTSET  = TAMPER_EARTH_FAULT;
    earth_fault   = 15;
  }
  else
  {
    PORTB.OUTCLR  = TAMPER_EARTH_FAULT;
  }
  
  if (active_energy_signed  < -5 || neutral_power < -5)     //comparing the sign of neutral and pahse power
  {     rev_current = 1;        }
  else
  {     rev_current = 0;                }
  if (rev_current == 1)
  {     PORTB.OUTTGL    = TAMPER_CURRENT_REVERSAL;              }   // toggle the LED on current reversal detection
  else
  {     PORTB.OUTCLR    = TAMPER_CURRENT_REVERSAL;              }
  if ((Vrms[0] == 0) && (Irms[0] > 500))
  {     PORTB.OUTSET    = TAMPER_NEUTRAL_CUT;                   }
  else
  {     PORTB.OUTCLR    = TAMPER_NEUTRAL_CUT;                   }
  if(magnetic_tamper_flag == 1)
  {
    lcd_read_write(LCD_DATA_READ_WRITE,24,1);
  }
}



ISR(PORTB_INT0_vect)
{
        SLEEP.CTRL &=  ~SLEEP_SEN_bm;
        PORTB.INT0MASK  = 0x00;
        key_flag++;
        if (key_flag > 10)
        {
                key_flag = 0;
        }
        delay_ms(50);           // to avoid switch bouncing
        PORTB.INTFLAGS = 0x00;
        PORTB.INT0MASK = PIN2_bm;
        init_lcd();     
}

ISR(PORTC_INT0_vect)
{
  SLEEP.CTRL &=  ~SLEEP_SEN_bm;
  uint8_t pin_val = 0;
  PORTC.INT0MASK        = 0x00;
  delay_ms(20);
  pin_val = PORTC.IN;
  if((pin_val & PIN2_bm) == 0)      // cover open interrupt, currently used to store energy value to eeprom for debugging
   {
      cover_open_flag ^= 0x1;
   }
  else if((pin_val & PIN4_bm) == 0x10)   
  {
    magnetic_tamper_flag = 1;
  }
  else if((pin_val & PIN5_bm) == 0)        //currently used to change the display for testing
  {
    key_flag--;
    if (key_flag == 255)
    {
      key_flag = 10;
    }
  }  
  PORTC.INTFLAGS = 0x00;
  PORTC.INT0MASK = PIN2_bm |PIN4_bm |PIN5_bm;   
}


ISR(PORTD_INT0_vect)
{
    SLEEP.CTRL    &=  ~SLEEP_SEN_bm;
    PORTD.PIN4CTRL      = PORT_OPC_WIREDAND_gc;
    //PORTD.OUTCLR  = PIN4_bm;
    __watchdog_reset();
}