Cleanup sendSharp and fix reliability

Author: Informatic

IRremote.cpp

@@ -1109,35 +1109,27 @@ linked LIRC file.
 void IRsend::sendSharp(unsigned long data, int nbits) {
  unsigned long invertdata = data ^ SHARP_TOGGLE_MASK;
  enableIROut(38);
- for (int i = 0; i < nbits; i++) {
- if (data & 0x4000) {
- mark(SHARP_BIT_MARK);
- space(SHARP_ONE_SPACE);
- }
- else {
- mark(SHARP_BIT_MARK);
- space(SHARP_ZERO_SPACE);
- }
- data <<= 1;
- }
- 
- mark(SHARP_BIT_MARK);
- space(SHARP_ZERO_SPACE);
- delay(46);
- for (int i = 0; i < nbits; i++) {
- if (invertdata & 0x4000) {
- mark(SHARP_BIT_MARK);
- space(SHARP_ONE_SPACE);
- }
- else {
- mark(SHARP_BIT_MARK);
- space(SHARP_ZERO_SPACE);
+
+ // Sending codes in bursts of 3 (normal, inverted, normal) makes transmission
+ // much more reliable. That's the exact behaviour of CD-S6470 remote control.
+ for (int n = 0; n < 3; n++) {
+ for (int i = 1 << (nbits-1); i > 0; i>>=1) {
+ if (data & i) {
+ mark(SHARP_BIT_MARK);
+ space(SHARP_ONE_SPACE);
+ }
+ else {
+ mark(SHARP_BIT_MARK);
+ space(SHARP_ZERO_SPACE);
+ }
  }
- invertdata <<= 1;
+ 
+ mark(SHARP_BIT_MARK);
+ space(SHARP_ZERO_SPACE);
+ delay(40);
+
+ data = data ^ SHARP_TOGGLE_MASK;
  }
- mark(SHARP_BIT_MARK);
- space(SHARP_ZERO_SPACE);
- delay(46);
 }
 
 void IRsend::sendDISH(unsigned long data, int nbits)