repair to work with grove
Dependents: Grove-temp-Joy-Dig-Display-Range
Diff: RangeFinder.cpp
- Revision:
- 0:05c9036328ee
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/RangeFinder.cpp Wed Jul 04 15:55:50 2012 +0000 @@ -0,0 +1,39 @@ +/* Copyright (c) 2012 Nick Ryder, University of Oxford + * nick.ryder@physics.ox.ac.uk + * + * MIT License + * + * 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 "RangeFinder.h" + +RangeFinder::RangeFinder(PinName pin, int pulsetime, float scale, int time): + pio(pin), scale(scale), pulsetime(pulsetime), timeout(time) { +} + +RangeFinder::~RangeFinder() { +} + +float RangeFinder::read_m() { + pio.write_us(1, pulsetime); + float t = (float) pio.read_high_us(timeout); + if (t == -1.0) { + return -1.0; + } + return t / scale; +}