//INTERRUPT1
//Program to tests interrupts
//Interrupts the flashing of an LED by 'simultaneously' mirroring RX port to ESC when RX changes state
//Written for PIC12F683 to be compiled with the CC5X compiler
//Clock frequency not changed from 4MHz default
//Copyright David Theunissen 2007 www.flyelectric.ukgateway.net

//-----------------------------------------------------------------------------
#include "12F683.H"				//PIC chip file
#include "INT16CXX.H"			//Interrupt header file from CC5X

#pragma origin 4				//Locates interrupt location at address 4 as required by CC5X

#pragma config = 0b.11.1100.0100//Normal device configuration
								//11. Brown-out Detect enabled
								//11 Code Protect off
								//0 MCLR/GP3 set to digital input
								//0. Powerup timer enabled
								//0 Watchdog timer disabled
								//100 Oscillator set to INTRCIO
								
#define ESC 	GPIO.1			//GP1 (Pin6) is ESC
#define RX 		GPIO.3			//GP3 (Pin4) is RX
#define LED1 	GPIO.5			//GP5 (Pin2) is LED1

//-----------------------------------------------------------------------------
//Position of interrupt function and some #include files have to be juggled around
//This is to avoid 'overlapping code' compile errors
//These seem to be caused by taking up too much memory before the #pragma origin 4 statement

interrupt esc_rx()				//Interrupt function for ESC to mirror RX when RX changes state
{
	int_save_registers    		//Standard registers saved
	ESC=RX;						//Mirror RX pulse to ESC on each change of state
	GPIF=0;						//Clear the GPIO interrupt flag after each change of state
	int_restore_registers 		//Pre-interrupt register settings restored
}

//-----------------------------------------------------------------------------

#include "delay_ms.h"			//Delay function used below
								//Placed here to avoid  compile errors (see above)


//FUNCTIONS section (ie: programs) ============================================
	
void main()						
{								
//	TRISIO0 = 0;				//Sets GP0/AN0 (pin7) to Output
	TRISIO1 = 0;				//Sets GP1/AN1 (pin6) to Output (ESC)
//	TRISIO2 = 1;				//sets GP2/AN2 (pin5) to Input
	TRISIO3 = 1;				//sets GP3 (pin4) to Input (RX)
//	TRISIO4 = 1;				//sets GP4/AN3 (pin3) to Input
	TRISIO5 = 0;				//Sets GP5 (pin2) to Output (LED1)
    
//	ANS0 = 0;					//Sets AN0 (pin7) to digital
	ANS1 = 0;					//Sets AN1 (pin6) to digital
//  ANS2 = 1;					//Sets AN2 (pin5) to analogue
//  ANS3 = 1;					//Sets AN3 (pin3) to analogue
    
    CMCON0 = 0b.111;			//Switches all 3 comparator ports off
    
    GIE = 1;					//Enable interrupts
    GPIE = 1;					//Enable GPIO interrupts
    IOC = 0b.0.1000;			//Only GP3 enabled
    

//-----------------------------------------------------------------------------
			
    while (1)
    {
	    LED1 = 0;				
	    delay_ms(500);			
  
	    LED1 = 1;
		delay_ms(500);
    }						//end while
}							//end main