Rotary encoder library.
Dependents: RotaryEncoder_TestProgram ST7735_Pong accuBlast_display
Diff: RotaryEncoder.cpp
- Revision:
- 0:6537b3b709b6
- Child:
- 1:8000eddbf4aa
diff -r 000000000000 -r 6537b3b709b6 RotaryEncoder.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/RotaryEncoder.cpp Sun Dec 19 05:03:45 2010 +0000 @@ -0,0 +1,75 @@ +/** + * ============================================================================= + * Rotary Encoder class (Version 0.0.1) + * ============================================================================= + * Copyright (c) 2010 Shinichiro Nakamura (CuBeatSystems) + * + * 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 "RotaryEncoder.h" + +/** + * Create rotary encoder. + * + * @param pin1_name + * @param pin2_name + * @param min Minimum value. + * @param max Maximum value. + * @param val Default value. + */ +RotaryEncoder::RotaryEncoder(PinName pin1_name, PinName pin2_name, int min, int max, int val) + : pin1(pin1_name), pin2(pin2_name), min(min), max(max), val(val) { + pin1.mode(PullUp); + pin2.mode(PullUp); + ticker.attach_us(this, &RotaryEncoder::func_ticker, 500); +} + +/** + * Dispose. + */ +RotaryEncoder::~RotaryEncoder() { +} + +/** + * Internal tick function. + */ +void RotaryEncoder::func_ticker() { + static uint8_t code; + + code = (code << 2) + (((pin1.read() << 1) | (pin2.read() << 0)) & 3); + code &= 15; + switch (i) { + case 0x7: + if (min < val) { + val--; + } else { + val = min; + } + break; + case 0xd: + if (val < max) { + val++; + } else { + val = max; + } + break; + } +}