experimental fork to solve timing issues
Fork of TxIR by
Diff: TxIR.cpp
- Revision:
- 0:7d2088337345
- Child:
- 2:cc8371213c85
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TxIR.cpp Sun Dec 12 05:36:26 2010 +0000 @@ -0,0 +1,78 @@ + +/****************************************************************************** + * Low level infrared transmission + * This library provides a low level interface to send IR commands. in principle + * other higher level IR type remotes could be build on top of this. I wrote + * this code to send IR commands to a Nikon camera, which it works rather well + * for. + * + * Copyright (C) 2010 Ali Saidi + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + + #include "TxIR.hpp" + + +void +TxIR::doAction() +{ + if (pos >= len) { + delete [] data; + _inUse = false; + txPin.write(0); + return; + } + + delay.attach_us(this, &TxIR::doAction, data[pos++]); + if (high) + txPin.write(0); + else + txPin.write(0.5); + high = !high; +} + +bool +TxIR::txSeq(unsigned freq, unsigned _len, const unsigned *_data) +{ + // @todo a lock or semaphore should be used here + if (inUse()) + return false; + _inUse = true; + + // keep a copy of the data, so it can't change + len = _len; + data = new unsigned[len]; + memcpy(data, _data, len * sizeof(unsigned)); + pos = 0; + + // setup the PWM + txPin.write(0.0); + txPin.period_us(freq); + + // Get the interrupt ready + delay.detach(); + high = true; + delay.attach_us(this, &TxIR::doAction, data[pos++]); + + // Begin + txPin.write(0.5); + + return true; +}