TB6612.cpp

00001 /* wallbot mini Library
00002  *
00003  * wallbotmini.cpp
00004  *
00005  * Copyright (c) 2010-2013 jksoft
00006  *
00007  * Permission is hereby granted, free of charge, to any person obtaining a copy
00008  * of this software and associated documentation files (the "Software"), to deal
00009  * in the Software without restriction, including without limitation the rights
00010  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00011  * copies of the Software, and to permit persons to whom the Software is
00012  * furnished to do so, subject to the following conditions:
00013  *
00014  * The above copyright notice and this permission notice shall be included in
00015  * all copies or substantial portions of the Software.
00016  *
00017  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00018  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00019  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00020  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00021  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00022  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00023  * THE SOFTWARE.
00024  */
00025 
00026 
00027 #include "TB6612.h"
00028 
00029 // TB6612 Class Constructor
00030 TB6612::TB6612(PinName pwm, PinName fwd, PinName rev):
00031         _pwm(pwm), _fwd(fwd), _rev(rev) {
00032 
00033     _fwd = 0;
00034     _rev = 0;
00035     _pwm = 0.0;
00036     stat = 0;
00037     _pwm.period(0.001);
00038     
00039 }
00040 
00041 // Speed Control
00042 //  arg
00043 //   float speed -1.0 - 0.0 - 1.0
00044 float TB6612::speed(float speed) {
00045     
00046     if( speed > 0.0 )
00047     {
00048         _pwm = speed;
00049         _fwd = 1;
00050         _rev = 0;
00051         stat = 1;
00052     }
00053     else if( speed < 0.0 )
00054     {
00055         _pwm = -speed;
00056         _fwd = 0;
00057         _rev = 1;
00058         stat = -1;
00059     }
00060     else
00061     {
00062         _fwd = 1;
00063         _rev = 1;
00064         stat = 0;
00065     }
00066     return speed==0 ? 0 : speed > 0 ? 1 : -1;
00067 }