Nordic Pucks / IRSender

Lib for sending IR signals from mbed.

Dependents:   ir-puck ir-puck2 ir-puck

IRSender.cpp@0:741de6c95ae9, 2014-07-25 (annotated)

Committer:
cristea
Date:
Fri Jul 25 07:43:47 2014 +0000
Revision:
0:741de6c95ae9
Child:
2:4576fcd93ffd
Initial commit of cleaned up IR sending lib

Who changed what in which revision?

UserRevisionLine numberNew contents of line
cristea 0:741de6c95ae9 1
cristea 0:741de6c95ae9 2 #include "mbed.h"
cristea 0:741de6c95ae9 3 #include "IRSender.h"
cristea 0:741de6c95ae9 4
cristea 0:741de6c95ae9 5 bool IRSender::irSeq(unsigned freq, unsigned len, const unsigned *data)
cristea 0:741de6c95ae9 6 {
cristea 0:741de6c95ae9 7 // TODO: implement a lock or semaphore here
cristea 0:741de6c95ae9 8 if (_inUse) {
cristea 0:741de6c95ae9 9 return false;
cristea 0:741de6c95ae9 10 }
cristea 0:741de6c95ae9 11 _inUse = true;
cristea 0:741de6c95ae9 12
cristea 0:741de6c95ae9 13 int pos = 0;
cristea 0:741de6c95ae9 14 senderPin.write(0.0);
cristea 0:741de6c95ae9 15 senderPin.period_us(freq);
cristea 0:741de6c95ae9 16
cristea 0:741de6c95ae9 17 int times[len];
cristea 0:741de6c95ae9 18 for (int i=0; i<len; i++) {
cristea 0:741de6c95ae9 19 times[i] = 0;
cristea 0:741de6c95ae9 20 }
cristea 0:741de6c95ae9 21
cristea 0:741de6c95ae9 22 int bit = 1;
cristea 0:741de6c95ae9 23 LOG("Start\n");
cristea 0:741de6c95ae9 24 senderPin.write(0.5);
cristea 0:741de6c95ae9 25 timer.start();
cristea 0:741de6c95ae9 26
cristea 0:741de6c95ae9 27 int time = timer.read_us();
cristea 0:741de6c95ae9 28 int old_time = time;
cristea 0:741de6c95ae9 29 int dt = 0;
cristea 0:741de6c95ae9 30
cristea 0:741de6c95ae9 31 while (pos < len) {
cristea 0:741de6c95ae9 32 // TODO: Handle timer overflow
cristea 0:741de6c95ae9 33 // Consider using GPIOTE
cristea 0:741de6c95ae9 34 old_time = time;
cristea 0:741de6c95ae9 35 time = timer.read_us();
cristea 0:741de6c95ae9 36 dt += time - old_time;
cristea 0:741de6c95ae9 37
cristea 0:741de6c95ae9 38 while (dt > data[pos] && pos < len) {
cristea 0:741de6c95ae9 39 dt -= data[pos];
cristea 0:741de6c95ae9 40 bit = !bit;
cristea 0:741de6c95ae9 41 senderPin.write(0.5 * bit);
cristea 0:741de6c95ae9 42 times[pos] = dt;
cristea 0:741de6c95ae9 43 pos++;
cristea 0:741de6c95ae9 44 }
cristea 0:741de6c95ae9 45 }
cristea 0:741de6c95ae9 46
cristea 0:741de6c95ae9 47 timer.stop();
cristea 0:741de6c95ae9 48 senderPin.write(0);
cristea 0:741de6c95ae9 49 LOG("Success, wrote %i/%i\n", pos, len);
cristea 0:741de6c95ae9 50 LOG("Miss timings: %i", times[0]);
cristea 0:741de6c95ae9 51 for (int i=1; i<len; i++) {
cristea 0:741de6c95ae9 52 APPEND(", %i", times[i]);
cristea 0:741de6c95ae9 53 }
cristea 0:741de6c95ae9 54 APPEND("]\n");
cristea 0:741de6c95ae9 55 _inUse = false;
cristea 0:741de6c95ae9 56 return true;
cristea 0:741de6c95ae9 57 }