inter.c

#include <xc.h>
#include <stdint.h>

// Constants for oxygen level and water exchange
#define OXYGEN_THRESHOLD 80     // Threshold for low oxygen level
#define WATER_EXCHANGE_INTERVAL 5000   // Water exchange interval in milliseconds

// Function prototypes
void Interrupt_Init();
void __interrupt() OxygenLevel_ISR();
void __interrupt() WaterExchange_ISR();

// Global variables
volatile uint8_t oxygenLevel = 100;    // Initial oxygen level
volatile uint8_t waterExchangeFlag = 0;    // Water exchange flag
volatile uint16_t waterExchangeTimer = 0;  // Timer for water exchange interval

void main(void) {
    // Initialize Interrupts
    Interrupt_Init();

    while (1) {
        // Main program loop
        // Perform other tasks
    }

    return;
}

void Interrupt_Init() {
    // Enable interrupts
    INTCONbits.PEIE = 1;    // Peripheral Interrupt Enable bit
    INTCONbits.GIE = 1;     // Global Interrupt Enable bit

    // Configure oxygen level interrupt
    IOCANbits.IOCAN4 = 1;   // Interrupt on falling edge (LOW to HIGH)
    PIE0bits.IOCIE = 1;     // Enable IOC (Interrupt-on-Change) interrupt

    // Configure timer interrupt for water exchange
    T0CON0bits.T0EN = 1;    // Enable Timer0
    T0CON0bits.T016BIT = 0; // 8-bit mode
    T0CON0bits.T0OUTPS = 0b0000;    // 1:1 postscaler
    T0CON1bits.T0CS = 0b010;    // FOSC/4 as the clock source
    T0CON1bits.T0ASYNC = 0;     // Synchronized operation
    T0CON1bits.T0CKPS = 0b1111; // 1:32768 prescaler
    TMR0H = 0x06;   // Initialize Timer0 value (for 5 ms interrupt interval)
    TMR0L = 0x18;
    PIE0bits.TMR0IE = 1;    // Enable Timer0 interrupt
}

void __interrupt() OxygenLevel_ISR() {
    if (IOCAFbits.IOCAF4) {
        IOCAFbits.IOCAF4 = 0;    // Clear the interrupt flag

        // Read oxygen level from sensor
        // Update the oxygenLevel variable with the new value

        // Check oxygen level
        if (oxygenLevel < OXYGEN_THRESHOLD) {
            // Low oxygen level, take appropriate action (e.g., sound an alarm)
            // Perform necessary tasks
        }
    }
}

void __interrupt() WaterExchange_ISR() {
    if (PIR0bits.TMR0IF) {
        PIR0bits.TMR0IF = 0;    // Clear the Timer0 interrupt flag

        // Increment water exchange timer
        waterExchangeTimer++;

        // Check if water exchange interval has elapsed
        if (waterExchangeTimer >= WATER_EXCHANGE_INTERVAL) {
            waterExchangeTimer = 0;     // Reset the timer
            waterExchangeFlag = 1;      // Set the water exchange flag
        }
    }
}