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/******************************************************************************
* The MIT License
*
* Copyright (c) 2011 LeafLabs, LLC.
*
* 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.
*****************************************************************************/
/**
* @file libmaple/timer.c
* @author Marti Bolivar <mbolivar@leaflabs.com>
* @brief Portable timer routines.
*/
#include <libmaple/timer.h>
static void disable_channel(timer_dev *dev, uint8 channel);
static void pwm_mode(timer_dev *dev, uint8 channel);
static void output_compare_mode(timer_dev *dev, uint8 channel);
static inline void enable_irq(timer_dev *dev, uint8 interrupt);
/**
* Initialize a timer, and reset its register map.
* @param dev Timer to initialize
*/
void timer_init(timer_dev *dev) {
rcc_clk_enable(dev->clk_id);
rcc_reset_dev(dev->clk_id);
}
/**
* @brief Disable a timer.
*
* The timer will stop counting, all DMA requests and interrupts will
* be disabled, and no state changes will be output.
*
* @param dev Timer to disable.
*/
void timer_disable(timer_dev *dev) {
(dev->regs).bas->CR1 = 0;
(dev->regs).bas->DIER = 0;
switch (dev->type) {
case TIMER_ADVANCED: /* fall-through */
case TIMER_GENERAL:
(dev->regs).gen->CCER = 0;
break;
case TIMER_BASIC:
break;
}
}
/**
* Sets the mode of an individual timer channel.
*
* Note that not all timers can be configured in every mode. For
* example, basic timers cannot be configured to output compare mode.
* Be sure to use a timer which is appropriate for the mode you want.
*
* @param dev Timer whose channel mode to set
* @param channel Relevant channel
* @param mode New timer mode for channel
*/
void timer_set_mode(timer_dev *dev, uint8 channel, timer_mode mode) {
ASSERT_FAULT(channel > 0 && channel <= 4);
/* TODO decide about the basic timers */
ASSERT(dev->type != TIMER_BASIC);
if (dev->type == TIMER_BASIC)
return;
switch (mode) {
case TIMER_DISABLED:
disable_channel(dev, channel);
break;
case TIMER_PWM:
pwm_mode(dev, channel);
break;
case TIMER_OUTPUT_COMPARE:
output_compare_mode(dev, channel);
break;
}
}
/**
* @brief Attach a timer interrupt.
* @param dev Timer device
* @param interrupt Interrupt number to attach to; this may be any
* timer_interrupt_id or timer_channel value appropriate
* for the timer.
* @param handler Handler to attach to the given interrupt.
* @see timer_interrupt_id
* @see timer_channel
*/
void timer_attach_interrupt(timer_dev *dev,
uint8 interrupt,
voidFuncPtr handler) {
dev->handlers[interrupt] = handler;
timer_enable_irq(dev, interrupt);
enable_irq(dev, interrupt);
}
/**
* @brief Detach a timer interrupt.
* @param dev Timer device
* @param interrupt Interrupt number to detach; this may be any
* timer_interrupt_id or timer_channel value appropriate
* for the timer.
* @see timer_interrupt_id
* @see timer_channel
*/
void timer_detach_interrupt(timer_dev *dev, uint8 interrupt) {
timer_disable_irq(dev, interrupt);
dev->handlers[interrupt] = NULL;
}
/*
* Utilities
*/
static void disable_channel(timer_dev *dev, uint8 channel) {
timer_detach_interrupt(dev, channel);
timer_cc_disable(dev, channel);
}
static void pwm_mode(timer_dev *dev, uint8 channel) {
timer_disable_irq(dev, channel);
timer_oc_set_mode(dev, channel, TIMER_OC_MODE_PWM_1, TIMER_OC_PE);
timer_cc_enable(dev, channel);
}
static void output_compare_mode(timer_dev *dev, uint8 channel) {
timer_oc_set_mode(dev, channel, TIMER_OC_MODE_ACTIVE_ON_MATCH, 0);
timer_cc_enable(dev, channel);
}
/* FIXME: These IRQ enable routines fail for timers 9 through 14.
* We don't support those timers yet, so it's OK for now, but this
* really needs to get fixed. */
static void enable_advanced_irq(timer_dev *dev, timer_interrupt_id id);
static void enable_nonmuxed_irq(timer_dev *dev);
static inline void enable_irq(timer_dev *dev, timer_interrupt_id iid) {
if (dev->type == TIMER_ADVANCED) {
enable_advanced_irq(dev, iid);
} else {
enable_nonmuxed_irq(dev);
}
}
static void enable_advanced_irq(timer_dev *dev, timer_interrupt_id id) {
uint8 is_timer1 = dev->clk_id == RCC_TIMER1;
switch (id) {
case TIMER_UPDATE_INTERRUPT:
nvic_irq_enable(is_timer1 ? NVIC_TIMER1_UP : NVIC_TIMER8_UP);
break;
case TIMER_CC1_INTERRUPT:
case TIMER_CC2_INTERRUPT:
case TIMER_CC3_INTERRUPT:
case TIMER_CC4_INTERRUPT:
nvic_irq_enable(is_timer1 ? NVIC_TIMER1_CC : NVIC_TIMER8_CC);
break;
case TIMER_COM_INTERRUPT:
case TIMER_TRG_INTERRUPT:
nvic_irq_enable(is_timer1 ? NVIC_TIMER1_TRG_COM : NVIC_TIMER8_TRG_COM);
break;
case TIMER_BREAK_INTERRUPT:
nvic_irq_enable(is_timer1 ? NVIC_TIMER1_BRK : NVIC_TIMER8_BRK);
break;
}
}
static void enable_nonmuxed_irq(timer_dev *dev) {
switch (dev->clk_id) {
case RCC_TIMER2:
nvic_irq_enable(NVIC_TIMER2);
break;
case RCC_TIMER3:
nvic_irq_enable(NVIC_TIMER3);
break;
case RCC_TIMER4:
nvic_irq_enable(NVIC_TIMER4);
break;
case RCC_TIMER5:
nvic_irq_enable(NVIC_TIMER5);
break;
case RCC_TIMER6:
nvic_irq_enable(NVIC_TIMER6);
break;
case RCC_TIMER7:
nvic_irq_enable(NVIC_TIMER7);
break;
default:
ASSERT_FAULT(0);
break;
}
}
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