ir_LG.cpp

00001 #include "IRremote.h"
00002 #include "IRremoteInt.h"
00003 
00004 //==============================================================================
00005 //                               L       GGGG
00006 //                               L      G
00007 //                               L      G  GG
00008 //                               L      G   G
00009 //                               LLLLL   GGG
00010 //==============================================================================
00011 
00012 #define LG_BITS 28
00013 
00014 #define LG_HDR_MARK 8000
00015 #define LG_HDR_SPACE 4000
00016 #define LG_BIT_MARK 600
00017 #define LG_ONE_SPACE 1600
00018 #define LG_ZERO_SPACE 550
00019 #define LG_RPT_LENGTH 60000
00020 
00021 //+=============================================================================
00022 #if DECODE_LG
00023 bool  IRrecv::decodeLG (decode_results *results)
00024 {
00025     long  data   = 0;
00026     int   offset = 1; // Skip first space
00027 
00028     // Check we have the right amount of data
00029     if (irparams.rawlen < (2 * LG_BITS) + 1 )  return false ;
00030 
00031     // Initial mark/space
00032     if (!MATCH_MARK(results->rawbuf[offset++], LG_HDR_MARK))  return false ;
00033     if (!MATCH_SPACE(results->rawbuf[offset++], LG_HDR_SPACE))  return false ;
00034 
00035     for (int i = 0;  i < LG_BITS;  i++) {
00036         if (!MATCH_MARK(results->rawbuf[offset++], LG_BIT_MARK))  return false ;
00037 
00038         if      (MATCH_SPACE(results->rawbuf[offset], LG_ONE_SPACE))   data = (data << 1) | 1 ;
00039         else if (MATCH_SPACE(results->rawbuf[offset], LG_ZERO_SPACE))  data = (data << 1) | 0 ;
00040         else                                                           return false ;
00041         offset++;
00042     }
00043 
00044     // Stop bit
00045     if (!MATCH_MARK(results->rawbuf[offset], LG_BIT_MARK))   return false ;
00046 
00047     // Success
00048     results->bits        = LG_BITS;
00049     results->value       = data;
00050     results->decode_type = LG;
00051     return true;
00052 }
00053 #endif
00054 
00055 //+=============================================================================
00056 #if SEND_LG
00057 void  IRsend::sendLG (unsigned long data,  int nbits)
00058 {
00059     // Set IR carrier frequency
00060     enableIROut(38);
00061 
00062     // Header
00063     mark(LG_HDR_MARK);
00064     space(LG_HDR_SPACE);
00065     mark(LG_BIT_MARK);
00066 
00067     // Data
00068     for (unsigned long  mask = 1UL << (nbits - 1);  mask;  mask >>= 1) {
00069         if (data & mask) {
00070             space(LG_ONE_SPACE);
00071             mark(LG_BIT_MARK);
00072         } else {
00073             space(LG_ZERO_SPACE);
00074             mark(LG_BIT_MARK);
00075         }
00076     }
00077     space(0);  // Always end with the LED off
00078 }
00079 #endif
00080