> What I'm trying to do is decode my remote control.  For right now, I just
> have Timer1 setup with DIV_BY_1 and my CCP is set to capture on falling
> edge (inverted output from IR receiver).

I was just goofing around with a Sony transmitter & CCS and came up with this.

#include <16F876A.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#define pulsin_pin PIN_B1

long pulse[14];                 // Up to 14 pulse results

void pulsin(void)
{
     int i;

     for(i=0; i<14; i++)               // 0 to 13
     {
       while (input(pulsin_pin));   // Hold while pulsin_pin = 1
       set_timer1(0);                 // Zero timer1 on 1 to 0 transition
       while (!input(pulsin_pin));  // Hold while pulsin_pin = 0
       pulse[i] = get_timer1();     // Read number of timer1 ticks for pulse time
     }
}

void main()
{
     int i;
     float x;

     port_b_pullups(TRUE);           // Hold input pin + IR detector output high
     disable_interrupts(GLOBAL);  // Disable interrupts
     set_tris_b(0x01);                  // RB1 = pulse input
     setup_timer_1(T1_INTERNAL | T1_DIV_BY_1); // Internal clk + 1:1 prescale (200nS ticks)

     while(TRUE)
     {
       pulsin();                      // Measure 14 pulses

       for(i=0; i<14; i++)         // 0 to 13
         {
           x = pulse[i] * 0.0000002; // x * 200nS = pulse width
           printf("Pulse %u = %01.6f \r\n",i, x); // Print pulsin results
           delay_ms(500);            // Short delay between updates
         }  // end for
     }   // end while
}  // end main

/* Result when pressing button #1 on Sony TV transmitter

Pulse 0 = 0.002471   Start (2.4mS) header pulse
Pulse 1 = 0.000667   Button code data bit #1 (600uS = 0)
Pulse 2 = 0.000691   #2
Pulse 3 = 0.000644   #3
Pulse 4 = 0.000644   #4
Pulse 5 = 0.000667   #5
Pulse 6 = 0.000643   #6
Pulse 7 = 0.000691   #7
Pulse 8 = 0.001255   Sony TV device code bit #1 (1.2mS = 1)
Pulse 9 = 0.000644   #2
Pulse 10 = 0.000644  #3
Pulse 11 = 0.000692  #4
Pulse 12 = 0.000644  #5
Pulse 13 = 0.002472  Next start pulse after 7 data + 5 device bits

*/

I have some CCS routines for a 15-key Sony type IR transmitter using the
16F628A w/internal osc. I can email you copies if you want to experiment
with them.


Regards,

-Bruce
tech@rentron.com
http://www.rentron.com

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