24F32KA301 Example LED Flash using Microchip C

Example program for the Microchip PIC 24F32KA301 using Microchip C compiler

Using Timer1 and interrupts, flashes LED on A0 once per second

	
/*
 * Microchip C Compiler Demo Program for PIC24F32KA301
 * PIC24F32KA301 flash LED on A0 using Timer1 and interrupts
 * Copyright (C)2011 HobbyTronics.co.uk
 * Freely distributable.
*/ 

//include basic header definition
#include <p24f32ka301.h>

//config
_FOSCSEL(FNOSC_FRCPLL & IESO_OFF);    // FRC Oscillator with PLL (32MHz)
_FOSC (FCKSM_CSDCMD & SOSCSEL1_SOSCLP & POSCFREQ_MS 
       & OSCIOFNC_OFF & POSCMOD_NONE);  

/*Clock switching and Fail-Safe Clock monitor DISABLED
  Secondary Oscillator Select
  Primary Oscillator Frequency Range
  OSCO Pin Configuration OFF
  Oscillator Selection
*/

//prototypes
void timer1_init(void);

//main loop
int main(void)
{
   //Set up Clock
   OSCCON = 0x11C0;    // select INTERNAL FRC (32MHz), Post Scale & PLL
   CLKDIV = 0x0000;    // No clock Divide
    
   //Set Ports to Digital
   ANSELA=0x0000;
   ANSELB=0x0000;
   ANSELC=0x0000;
   TRISA=0x0000;
   LATAbits.LATA0 = 0;

   timer1_init();
   SRbits.IPL = 0 ;    // turn on all interrupt priorities
    
   //Loop forever
   while(1)
   {
   }
}

//Set up Timer, target 2Hz interrupts
void timer1_init(void)
{
   //Setup Timer1
   PR1 = 0x7A12;          // set for 2Hz (Clock is 32KHz/2 = 16MHz)
   IPC0bits.T1IP = 5;     //set interrupt priority
   T1CON = 0b1000000000110000;    //turn on the timer
   IFS0bits.T1IF = 0;     //reset interrupt flag
   IEC0bits.T1IE = 1;     //turn on the timer1 interrupt
}

//_T1Interrupt() is the T1 interrupt service routine (ISR).
void __attribute__((__interrupt__, auto_psv)) _T1Interrupt(void)
{
   LATAbits.LATA0 = ~LATAbits.LATA0;    //Toggle output to LED
   IFS0bits.T1IF = 0;
}