![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
Measure Distance
Diff: hcsr04.cpp
- Revision:
- 0:fb0929f37ebe
- Child:
- 1:093521f56089
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hcsr04.cpp Sat Mar 30 17:27:39 2013 +0000 @@ -0,0 +1,67 @@ +/* Copyright (c) 2013 Prabhu Desai + * pdtechworld@gmail.com + * + * 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 "hcsr04.h" + + +DistMeasure::DistMeasure(PinName TrigPin,PinName EchoPin,unsigned int maxtime): + trigger(TrigPin), echo(EchoPin), timeout(maxtime) +{ + pulsetime.stop(); + pulsetime.reset(); + // this.rise(&DistMeasure::isr_rise); + // this.fall(&DistMeasure::isr_fall); +} + + +DistMeasure::~DistMeasure() +{ +} + + +void DistMeasure::isr_rise(void) +{ + pulsetime.start(); +} + +void DistMeasure::isr_fall(void) +{ + pulsetime.stop(); + pulsedur = pulsetime.read_us(); + distance= (pulsedur*343)/20000; + pulsetime.reset(); +} +void DistMeasure::rise (void (*fptr)(void)) +{ + echo.rise(fptr); +} +void DistMeasure::fall (void (*fptr)(void)) +{ + echo.fall(fptr); +} + +unsigned int DistMeasure::get_distance_cm() +{ + if(distance > 65530) { + return -1; + } else { + return distance; + } +}