157 lines
4.7 KiB
C++
157 lines
4.7 KiB
C++
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 Bryan Newbold.
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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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#include <wirish/HardwareTimer.h>
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#include <libmaple/rcc.h>
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#include <wirish/ext_interrupts.h> // for noInterrupts(), interrupts()
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#include <wirish/wirish_math.h>
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#include <board/board.h> // for CYCLES_PER_MICROSECOND
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// TODO [0.1.0] Remove deprecated pieces
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/*
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* Evil hack to infer this->dev from timerNum in the HardwareTimer
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* constructor. See:
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*
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* http://www.parashift.com/c++-faq-lite/pointers-to-members.html#faq-33.2
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* http://yosefk.com/c++fqa/function.html#fqa-33.2
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*/
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extern "C" {
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static timer_dev **this_devp;
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static rcc_clk_id this_id;
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static void set_this_dev(timer_dev *dev) {
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if (dev->clk_id == this_id) {
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*this_devp = dev;
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}
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}
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}
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/*
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* HardwareTimer routines
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*/
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HardwareTimer::HardwareTimer(uint8 timerNum) {
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rcc_clk_id timerID = (rcc_clk_id)(RCC_TIMER1 + (timerNum - 1));
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this->dev = NULL;
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noInterrupts(); // Hack to ensure we're the only ones using
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// set_this_dev() and friends. TODO: use a lock.
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this_id = timerID;
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this_devp = &this->dev;
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timer_foreach(set_this_dev);
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interrupts();
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ASSERT(this->dev != NULL);
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}
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void HardwareTimer::pause(void) {
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timer_pause(this->dev);
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}
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void HardwareTimer::resume(void) {
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timer_resume(this->dev);
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}
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uint32 HardwareTimer::getPrescaleFactor(void) {
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return timer_get_prescaler(this->dev) + 1;
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}
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void HardwareTimer::setPrescaleFactor(uint32 factor) {
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timer_set_prescaler(this->dev, (uint16)(factor - 1));
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}
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uint16 HardwareTimer::getOverflow() {
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return timer_get_reload(this->dev);
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}
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void HardwareTimer::setOverflow(uint16 val) {
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timer_set_reload(this->dev, val);
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}
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uint16 HardwareTimer::getCount(void) {
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return timer_get_count(this->dev);
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}
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void HardwareTimer::setCount(uint16 val) {
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uint16 ovf = this->getOverflow();
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timer_set_count(this->dev, min(val, ovf));
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}
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#define MAX_RELOAD ((1 << 16) - 1)
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uint16 HardwareTimer::setPeriod(uint32 microseconds) {
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// Not the best way to handle this edge case?
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if (!microseconds) {
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this->setPrescaleFactor(1);
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this->setOverflow(1);
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return this->getOverflow();
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}
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uint32 period_cyc = microseconds * CYCLES_PER_MICROSECOND;
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uint16 prescaler = (uint16)(period_cyc / MAX_RELOAD + 1);
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uint16 overflow = (uint16)((period_cyc + (prescaler / 2)) / prescaler);
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this->setPrescaleFactor(prescaler);
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this->setOverflow(overflow);
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return overflow;
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}
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void HardwareTimer::setMode(int channel, timer_mode mode) {
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timer_set_mode(this->dev, (uint8)channel, (timer_mode)mode);
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}
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uint16 HardwareTimer::getCompare(int channel) {
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return timer_get_compare(this->dev, (uint8)channel);
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}
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void HardwareTimer::setCompare(int channel, uint16 val) {
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uint16 ovf = this->getOverflow();
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timer_set_compare(this->dev, (uint8)channel, min(val, ovf));
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}
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void HardwareTimer::attachInterrupt(int channel, voidFuncPtr handler) {
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timer_attach_interrupt(this->dev, (uint8)channel, handler);
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}
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void HardwareTimer::detachInterrupt(int channel) {
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timer_detach_interrupt(this->dev, (uint8)channel);
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}
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void HardwareTimer::refresh(void) {
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timer_generate_update(this->dev);
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}
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/* -- Deprecated predefined instances -------------------------------------- */
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HardwareTimer Timer1(1);
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HardwareTimer Timer2(2);
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HardwareTimer Timer3(3);
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HardwareTimer Timer4(4);
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#ifdef STM32_HIGH_DENSITY
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HardwareTimer Timer5(5);
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HardwareTimer Timer6(6);
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HardwareTimer Timer7(7);
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HardwareTimer Timer8(8);
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#endif
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