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