/*  IRF TX for NIKON-CAMERA  2012/9/8      By@M.K
    Target     : PIC12F629   4MHz       :3V control
    CONFIG     : 0x3184      mikroC Pro V5.4
    GP0=Steart SW            GP2=IFR_LED
    Last MOD   9/17 14:42    Used ROM 128
------------------------
From data: http://www.sbprojects.com/projects/nikon/index.php
  +--//----+        +-----+        +-----+        +-----+
  |        | 28000us|     | 1580us |     | 3580us |     |
--+ 2000us +---//---+400us+---//---+400us+---//---+400us+---
*/

sbit SW   at GP4_bit;             // Start ON

char      i;

void IFR_TX1()                    //2000 USec
{
     for (i=0;i<76;i++) {
         GPIO=7;
         Delay_us(11);
         GPIO=0;
         Delay_us(5);
     }
         Delay_us(13);
}

void IFR_TX2()                    //401 USec
{
     for (i=0;i<15;i++) {
         GPIO=7;
         Delay_us(11);
         GPIO=0;
         Delay_us(5);
     }
}

void interrupt()
{                                 //interrupt over
    if (INTCON.GPIF==1)
        INTCON.GPIF=0;
}

void main()
{
     OSCCAL=0x38;                 //tun frequency
     CMCON =0b00000111;           //un use Compalater
     TRISIO=0b00011000;           //I/O set
     GPIO  =0;
     WPU   =0b00010000;
     OPTION_REG=0b00000000;       // TMR0 Prescaler 1/2 TMR0 1/250=1/500
     IOC   =0b00010000;           //set of INTERRUPT-ON-CHANGE GPIO REGISTER
//
     while (1) {
         TRISIO=0xff;
         INTCON=0b10001000;       //GIE.GPIE [un use timer0]
         asm SLEEP;               // Stop
         INTCON=0;
         TRISIO=0b00011000;
// main Camera Control
           IFR_TX1();             // 2mS on-off
             Delay_ms(28);        // 28mS Wait
           IFR_TX2();             //400US on-off
             Delay_us(1580);
           IFR_TX2();
             Delay_us(3580);
           IFR_TX2();             //End of TX
               while(GP4_bit==0); // SW over!
     }
}