Aleksander Vognild Burkow / TxIR

Fork of TxIR

Fork of TxIR by Nordic Pucks

TxIR.cpp@2:cc8371213c85, 2014-06-26 (annotated)

Committer:
sigveseb
Date:
Thu Jun 26 14:18:26 2014 +0000
Revision:
2:cc8371213c85
Parent:
0:7d2088337345
Child:
3:bc64c2d5bc26
change timing strategy

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ASaidi 0:7d2088337345 1
ASaidi 0:7d2088337345 2 /******************************************************************************
ASaidi 0:7d2088337345 3 * Low level infrared transmission
ASaidi 0:7d2088337345 4 * This library provides a low level interface to send IR commands. in principle
ASaidi 0:7d2088337345 5 * other higher level IR type remotes could be build on top of this. I wrote
ASaidi 0:7d2088337345 6 * this code to send IR commands to a Nikon camera, which it works rather well
ASaidi 0:7d2088337345 7 * for.
ASaidi 0:7d2088337345 8 *
ASaidi 0:7d2088337345 9 * Copyright (C) 2010 Ali Saidi
ASaidi 0:7d2088337345 10 *
ASaidi 0:7d2088337345 11 * Permission is hereby granted, free of charge, to any person obtaining a copy
ASaidi 0:7d2088337345 12 * of this software and associated documentation files (the "Software"), to deal
ASaidi 0:7d2088337345 13 * in the Software without restriction, including without limitation the rights
ASaidi 0:7d2088337345 14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
ASaidi 0:7d2088337345 15 * copies of the Software, and to permit persons to whom the Software is
ASaidi 0:7d2088337345 16 * furnished to do so, subject to the following conditions:
ASaidi 0:7d2088337345 17 *
ASaidi 0:7d2088337345 18 * The above copyright notice and this permission notice shall be included in
ASaidi 0:7d2088337345 19 * all copies or substantial portions of the Software.
ASaidi 0:7d2088337345 20 *
ASaidi 0:7d2088337345 21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
ASaidi 0:7d2088337345 22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
ASaidi 0:7d2088337345 23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
ASaidi 0:7d2088337345 24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
ASaidi 0:7d2088337345 25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
ASaidi 0:7d2088337345 26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
ASaidi 0:7d2088337345 27 * THE SOFTWARE.
ASaidi 0:7d2088337345 28 */
sigveseb 2:cc8371213c85 29 #include "mbed.h"
ASaidi 0:7d2088337345 30 #include "TxIR.hpp"
ASaidi 0:7d2088337345 31
sigveseb 2:cc8371213c85 32 bool shouldFlip;
sigveseb 2:cc8371213c85 33
sigveseb 2:cc8371213c85 34 Serial pc(USBTX, USBRX);
sigveseb 2:cc8371213c85 35
sigveseb 2:cc8371213c85 36 Timer timer;
ASaidi 0:7d2088337345 37
ASaidi 0:7d2088337345 38 void
ASaidi 0:7d2088337345 39 TxIR::doAction()
ASaidi 0:7d2088337345 40 {
ASaidi 0:7d2088337345 41 if (pos >= len) {
ASaidi 0:7d2088337345 42 return;
ASaidi 0:7d2088337345 43 }
sigveseb 2:cc8371213c85 44 pc.printf("doAction, pos: %i\n", pos);
sigveseb 2:cc8371213c85 45 shouldFlip = true;
sigveseb 2:cc8371213c85 46 delay.attach_us(this, &TxIR::doAction, data[pos++] * 200);
ASaidi 0:7d2088337345 47 }
ASaidi 0:7d2088337345 48
ASaidi 0:7d2088337345 49 bool
sigveseb 2:cc8371213c85 50 TxIR::txSeq(unsigned freq, unsigned len, const unsigned *data)
ASaidi 0:7d2088337345 51 {
sigveseb 2:cc8371213c85 52
ASaidi 0:7d2088337345 53 // @todo a lock or semaphore should be used here
ASaidi 0:7d2088337345 54 if (inUse())
ASaidi 0:7d2088337345 55 return false;
ASaidi 0:7d2088337345 56 _inUse = true;
ASaidi 0:7d2088337345 57
ASaidi 0:7d2088337345 58 // keep a copy of the data, so it can't change
ASaidi 0:7d2088337345 59 pos = 0;
ASaidi 0:7d2088337345 60 // setup the PWM
ASaidi 0:7d2088337345 61 txPin.write(0.0);
ASaidi 0:7d2088337345 62 txPin.period_us(freq);
ASaidi 0:7d2088337345 63
ASaidi 0:7d2088337345 64 // Get the interrupt ready
ASaidi 0:7d2088337345 65 delay.detach();
sigveseb 2:cc8371213c85 66
sigveseb 2:cc8371213c85 67 int times[len];
sigveseb 2:cc8371213c85 68 for(int i=0;i<len;i++){
sigveseb 2:cc8371213c85 69 times[i] = 0;
sigveseb 2:cc8371213c85 70 }
ASaidi 0:7d2088337345 71
sigveseb 2:cc8371213c85 72 int bit = 1;
sigveseb 2:cc8371213c85 73 pc.printf("S\n");
ASaidi 0:7d2088337345 74 txPin.write(0.5);
sigveseb 2:cc8371213c85 75 timer.start();
sigveseb 2:cc8371213c85 76 int time = timer.read_us();
sigveseb 2:cc8371213c85 77 int old_time = time;
sigveseb 2:cc8371213c85 78 int dt = 0;
sigveseb 2:cc8371213c85 79 while(pos < len) {
sigveseb 2:cc8371213c85 80 old_time = time;
sigveseb 2:cc8371213c85 81 time = timer.read_us();
sigveseb 2:cc8371213c85 82 dt += time - old_time;
sigveseb 2:cc8371213c85 83 while(dt > data[pos]) {
sigveseb 2:cc8371213c85 84 dt -= data[pos];
sigveseb 2:cc8371213c85 85 bit = !bit;
sigveseb 2:cc8371213c85 86 txPin.write(0.5 * bit);
sigveseb 2:cc8371213c85 87 times[pos] = dt;
sigveseb 2:cc8371213c85 88 pos++;
sigveseb 2:cc8371213c85 89 }
sigveseb 2:cc8371213c85 90 }
sigveseb 2:cc8371213c85 91 timer.stop();
sigveseb 2:cc8371213c85 92 pc.printf("Success, wrote %i/%i\n", pos, len);
sigveseb 2:cc8371213c85 93 pc.printf("Miss timings: [%i", times[0]);
sigveseb 2:cc8371213c85 94 for(int i=1;i<len;i++){
sigveseb 2:cc8371213c85 95 pc.printf(", %i", times[i]);
sigveseb 2:cc8371213c85 96 }
sigveseb 2:cc8371213c85 97 txPin.write(0);
sigveseb 2:cc8371213c85 98 _inUse = false;
sigveseb 2:cc8371213c85 99 delay.detach();
ASaidi 0:7d2088337345 100 return true;
ASaidi 0:7d2088337345 101 }