293 lines
8.5 KiB
C
293 lines
8.5 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 libmaple/exti.c
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* @brief External interrupt control routines
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*/
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#include <libmaple/exti.h>
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#include <libmaple/libmaple.h>
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#include <libmaple/nvic.h>
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#include <libmaple/bitband.h>
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static inline void dispatch_single_exti(uint32 exti_num);
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static inline void dispatch_extis(uint32 start, uint32 stop);
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/*
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* Internal state
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*/
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typedef struct exti_channel {
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void (*handler)(void *);
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void *arg;
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} exti_channel;
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static exti_channel exti_channels[] = {
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{ .handler = NULL, .arg = NULL }, // EXTI0
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{ .handler = NULL, .arg = NULL }, // EXTI1
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{ .handler = NULL, .arg = NULL }, // EXTI2
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{ .handler = NULL, .arg = NULL }, // EXTI3
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{ .handler = NULL, .arg = NULL }, // EXTI4
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{ .handler = NULL, .arg = NULL }, // EXTI5
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{ .handler = NULL, .arg = NULL }, // EXTI6
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{ .handler = NULL, .arg = NULL }, // EXTI7
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{ .handler = NULL, .arg = NULL }, // EXTI8
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{ .handler = NULL, .arg = NULL }, // EXTI9
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{ .handler = NULL, .arg = NULL }, // EXTI10
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{ .handler = NULL, .arg = NULL }, // EXTI11
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{ .handler = NULL, .arg = NULL }, // EXTI12
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{ .handler = NULL, .arg = NULL }, // EXTI13
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{ .handler = NULL, .arg = NULL }, // EXTI14
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{ .handler = NULL, .arg = NULL }, // EXTI15
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};
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/*
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* Portable routines
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*/
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/**
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* @brief Register a handler to run upon external interrupt.
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*
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* This function assumes that the interrupt request corresponding to
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* the given external interrupt is masked.
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*
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* @param num External interrupt line number.
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* @param port Port to use as source input for external interrupt.
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* @param handler Function handler to execute when interrupt is triggered.
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* @param mode Type of transition to trigger on, one of:
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* EXTI_RISING, EXTI_FALLING, EXTI_RISING_FALLING.
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* @see exti_num
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* @see exti_cfg
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* @see voidFuncPtr
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* @see exti_trigger_mode
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*/
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void exti_attach_interrupt(exti_num num,
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exti_cfg port,
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voidFuncPtr handler,
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exti_trigger_mode mode) {
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// Call callback version with arg being null
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exti_attach_callback(num, port, (voidArgumentFuncPtr)handler, NULL, mode);
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}
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/**
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* @brief Register a handler with an argument to run upon external interrupt.
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*
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* This function assumes that the interrupt request corresponding to
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* the given external interrupt is masked.
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*
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* @param num External interrupt line number.
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* @param port Port to use as source input for external interrupt.
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* @param handler Function handler to execute when interrupt is triggered.
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* @param arg Argument to pass to the interrupt handler.
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* @param mode Type of transition to trigger on, one of:
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* EXTI_RISING, EXTI_FALLING, EXTI_RISING_FALLING.
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* @see exti_num
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* @see exti_cfg
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* @see voidFuncPtr
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* @see exti_trigger_mode
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*/
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void exti_attach_callback(exti_num num,
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exti_cfg port,
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voidArgumentFuncPtr handler,
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void *arg,
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exti_trigger_mode mode) {
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ASSERT(handler);
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/* Register the handler */
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exti_channels[num].handler = handler;
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exti_channels[num].arg = arg;
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/* Set trigger mode */
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switch (mode) {
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case EXTI_RISING:
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bb_peri_set_bit(&EXTI_BASE->RTSR, num, 1);
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break;
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case EXTI_FALLING:
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bb_peri_set_bit(&EXTI_BASE->FTSR, num, 1);
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break;
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case EXTI_RISING_FALLING:
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bb_peri_set_bit(&EXTI_BASE->RTSR, num, 1);
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bb_peri_set_bit(&EXTI_BASE->FTSR, num, 1);
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break;
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}
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/* Use the chip-specific exti_select() to map num to port */
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exti_select(num, port);
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/* Unmask external interrupt request */
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bb_peri_set_bit(&EXTI_BASE->IMR, num, 1);
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/* Enable the interrupt line */
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switch(num)
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{
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case EXTI0:
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nvic_irq_enable(NVIC_EXTI0);
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break;
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case EXTI1:
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nvic_irq_enable(NVIC_EXTI1);
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break;
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case EXTI2:
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nvic_irq_enable(NVIC_EXTI2);
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break;
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case EXTI3:
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nvic_irq_enable(NVIC_EXTI3);
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break;
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case EXTI4:
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nvic_irq_enable(NVIC_EXTI4);
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break;
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case EXTI5:
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case EXTI6:
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case EXTI7:
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case EXTI8:
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case EXTI9:
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nvic_irq_enable(NVIC_EXTI_9_5);
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break;
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case EXTI10:
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case EXTI11:
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case EXTI12:
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case EXTI13:
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case EXTI14:
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case EXTI15:
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nvic_irq_enable(NVIC_EXTI_15_10);
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break;
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}
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}
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/**
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* @brief Unregister an external interrupt handler
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* @param num External interrupt line to disable.
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* @see exti_num
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*/
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void exti_detach_interrupt(exti_num num) {
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/* First, mask the interrupt request */
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bb_peri_set_bit(&EXTI_BASE->IMR, num, 0);
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/* Then, clear the trigger selection registers */
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bb_peri_set_bit(&EXTI_BASE->FTSR, num, 0);
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bb_peri_set_bit(&EXTI_BASE->RTSR, num, 0);
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/* Finally, unregister the user's handler */
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exti_channels[num].handler = NULL;
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exti_channels[num].arg = NULL;
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}
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/*
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* Private routines
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*/
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void exti_do_select(__io uint32 *exti_cr, exti_num num, exti_cfg port) {
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uint32 shift = 4 * (num % 4);
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uint32 cr = *exti_cr;
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cr &= ~(0xF << shift);
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cr |= port << shift;
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*exti_cr = cr;
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}
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/*
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* Interrupt handlers
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*/
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void __irq_exti0(void) {
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dispatch_single_exti(EXTI0);
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}
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void __irq_exti1(void) {
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dispatch_single_exti(EXTI1);
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}
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void __irq_exti2(void) {
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dispatch_single_exti(EXTI2);
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}
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void __irq_exti3(void) {
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dispatch_single_exti(EXTI3);
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}
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void __irq_exti4(void) {
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dispatch_single_exti(EXTI4);
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}
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void __irq_exti9_5(void) {
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dispatch_extis(5, 9);
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}
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void __irq_exti15_10(void) {
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dispatch_extis(10, 15);
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}
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/*
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* Auxiliary functions
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*/
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/* Clear the pending bits for EXTIs whose bits are set in exti_msk.
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*
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* If a pending bit is cleared as the last instruction in an ISR, it
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* won't actually be cleared in time and the ISR will fire again. To
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* compensate, this function NOPs for 2 cycles after clearing the
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* pending bits to ensure it takes effect. */
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static __always_inline void clear_pending_msk(uint32 exti_msk) {
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EXTI_BASE->PR = exti_msk;
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asm volatile("nop");
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asm volatile("nop");
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}
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/* This dispatch routine is for non-multiplexed EXTI lines only; i.e.,
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* it doesn't check EXTI_PR. */
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static __always_inline void dispatch_single_exti(uint32 exti) {
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voidArgumentFuncPtr handler = exti_channels[exti].handler;
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if (!handler) {
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return;
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}
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handler(exti_channels[exti].arg);
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clear_pending_msk(1U << exti);
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}
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/* Dispatch routine for EXTIs which share an IRQ. */
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static __always_inline void dispatch_extis(uint32 start, uint32 stop) {
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uint32 pr = EXTI_BASE->PR;
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uint32 handled_msk = 0;
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uint32 exti;
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/* Dispatch user handlers for pending EXTIs. */
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for (exti = start; exti <= stop; exti++) {
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uint32 eb = (1U << exti);
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if (pr & eb) {
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voidArgumentFuncPtr handler = exti_channels[exti].handler;
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if (handler) {
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handler(exti_channels[exti].arg);
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handled_msk |= eb;
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}
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}
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}
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/* Clear the pending bits for handled EXTIs. */
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clear_pending_msk(handled_msk);
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}
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