use interrupts

main.c

@@ -18,35 +18,53 @@
 #pragma config IESO = OFF       // Internal/External Switchover disabled
 #pragma config FCMEN = OFF      // Fail-Safe Clock Monitor disabled
 
-void main(void) {
-    // Clock setup (8MHz)
-    OSCCON = 0x70;             // Internal oscillator at 8MHz
+void __interrupt() isr(void) {
+    INTCONbits.GIE = 0;
     
-    TRISIO = 0b00000010;       // GP1 input, GP2 output
-    ANSEL  = 0b01000010;       // AN1 analog, ADC clock Fosc/32 (ADCS2=1)
-    
-    // ADC Configuration
-    ADCON0 = 0x85;             // ADC ON, Channel AN1, ADCS=01 (Fosc/32)
-    
-    // PWM Configuration
-    PR2 = 0xFF;                // PWM period ~1.95kHz
-    CCP1CON = 0x0C;            // PWM mode
-    T2CON = 0x04;              // Timer2 on, prescaler 1:1
-
-    while(1) {
-        ADCON0bits.GO = 1; // Set GO/DONE bit (bit 1)
-        while(ADCON0bits.GO);  // Wait for conversion
-        
-        // Read 10-bit result
-        CCPR1L = ((ADRESH & 0x03) << 8) | ADRESL;
+    if (PIR1bits.ADIF) {
+        // Read ADC result
+        unsigned int adc_result = 0;
+        adc_result = ((ADRESH & 0x03) << 8) | ADRESL;
         
         // Update PWM duty cycle
-        unsigned int adc_value = ((ADRESH & 0x03) << 8) | ADRESL;
-
-        // Set PWM duty cycle
-        CCPR1L = adc_value >> 2;          // Upper 8 bits
-        CCP1CONbits.DC1B = adc_value & 3; // Lower 2 bits
+        CCPR1L = adc_result >> 2;        // Upper 8 bits
+        CCP1CONbits.DC1B = adc_result & 0x03; // Lower 2 bits
         
-        __delay_ms(10);
+        // Clear interrupt flag and restart conversion
+        PIR1bits.ADIF = 0;
+        ADCON0bits.GO = 1;
+    }
+    
+    INTCONbits.GIE = 1;
+}
+
+void main(void) {
+    // Clock setup
+    OSCCON = 0x70;             // 8MHz internal oscillator
+    
+    // GPIO configuration
+    TRISIO = 0b00000010;       // GP1 input, GP2 output
+    ANSEL = 0b00000010;        // AN1 analog, ADCS2=0 (Fosc/32)
+    
+    // ADC configuration
+    ADCON0 = 0x85;             // ADON=1, CHS=AN1, ADCS=10 (Fosc/32)
+    
+    // PWM configuration
+    PR2 = 0xFF;                // PWM period ~7.8kHz (1:1 prescaler)
+    CCP1CON = 0x0C;            // PWM mode
+    T2CON = 0x06;              // Timer2 on, prescaler 1:1
+          
+    // Interrupt configuration
+    //PIR1bits.ADIF = 0;         // Clear ADC ready flag
+    PIE1bits.ADIE = 1;         // Enable ADC interrupts
+    INTCONbits.PEIE = 1;       // Enable peripheral interrupts
+    INTCONbits.GIE = 1;        // Enable global interrupts
+   
+    // Start first conversion
+    ADCON0bits.GO = 1;
+    
+    while(1) {
+        // Main loop sleeps between conversions
+        //SLEEP();
     }
 }