62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 Perry Hung.
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* Copyright (c) 2011, 2012 LeafLabs, LLC.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file wirish/pwm.cpp
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* @brief Wiring-style pwmWrite().
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*/
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#include "pwm.h"
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#include <libmaple/libmaple_types.h>
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#include <libmaple/timer.h>
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#include "boards.h"
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#include "io.h"
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void pwmWrite(uint8 pin, uint16 duty_cycle) {
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if (pin >= BOARD_NR_GPIO_PINS) {
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return;
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}
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timer_dev *dev = PIN_MAP[pin].timer_device;
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uint8 cc_channel = PIN_MAP[pin].timer_channel;
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ASSERT(dev && cc_channel);
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timer_set_compare(dev, cc_channel, duty_cycle);
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}
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/*
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* Roger Clark. Added new function to replicate more closely what the Arduino API does
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* Note. This implementation is currently slower than it could be,
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* because pinMode needs to be called to set the special (new) mode of PWM
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* Some optimisation may be possible with pinMode or even in this function
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*/
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void analogWrite(uint8 pin, int duty_cycle8)
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{
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pinMode(pin,PWM);
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pwmWrite(pin,duty_cycle8 * 257);// 257 maps 255 to 65535 (i.e 255*257 = 65535)
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}
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