147 lines
2.9 KiB
C
147 lines
2.9 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2010 Mark Butler <mbutler@physics.otago.ac.nz>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/exti.h>
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#include <libopencm3/stm32/f2/syscfg.h>
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#include <libopencm3/stm32/f2/gpio.h>
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void exti_set_trigger(u32 extis, exti_trigger_type trig)
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{
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switch (trig) {
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case EXTI_TRIGGER_RISING:
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EXTI_RTSR |= extis;
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EXTI_FTSR &= ~extis;
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break;
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case EXTI_TRIGGER_FALLING:
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EXTI_RTSR &= ~extis;
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EXTI_FTSR |= extis;
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break;
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case EXTI_TRIGGER_BOTH:
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EXTI_RTSR |= extis;
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EXTI_FTSR |= extis;
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break;
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}
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}
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void exti_enable_request(u32 extis)
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{
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/* Enable interrupts. */
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EXTI_IMR |= extis;
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/* Enable events. */
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EXTI_EMR |= extis;
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}
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void exti_disable_request(u32 extis)
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{
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/* Disable interrupts. */
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EXTI_IMR &= ~extis;
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/* Disable events. */
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EXTI_EMR &= ~extis;
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}
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/*
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* Reset the interrupt request by writing a 1 to the corresponding
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* pending bit register.
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*/
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void exti_reset_request(u32 extis)
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{
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EXTI_PR = extis;
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}
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/*
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* Remap an external interrupt line to the corresponding pin on the
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* specified GPIO port.
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*
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* TODO: This could be rewritten in fewer lines of code.
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*/
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void exti_select_source(u32 exti, u32 gpioport)
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{
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u8 shift, bits;
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shift = bits = 0;
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switch (exti) {
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case EXTI0:
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case EXTI4:
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case EXTI8:
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case EXTI12:
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shift = 0;
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break;
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case EXTI1:
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case EXTI5:
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case EXTI9:
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case EXTI13:
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shift = 4;
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break;
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case EXTI2:
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case EXTI6:
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case EXTI10:
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case EXTI14:
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shift = 8;
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break;
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case EXTI3:
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case EXTI7:
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case EXTI11:
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case EXTI15:
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shift = 12;
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break;
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}
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switch (gpioport) {
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case GPIOA:
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bits = 0xf;
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break;
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case GPIOB:
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bits = 0xe;
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break;
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case GPIOC:
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bits = 0xd;
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break;
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case GPIOD:
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bits = 0xc;
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break;
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case GPIOE:
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bits = 0xb;
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break;
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case GPIOF:
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bits = 0xa;
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break;
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case GPIOG:
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bits = 0x9;
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break;
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}
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/* Ensure that only valid EXTI lines are used. */
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if (exti < EXTI4) {
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SYSCFG_EXTICR1 &= ~(0x000F << shift);
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SYSCFG_EXTICR1 |= (~bits << shift);
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} else if (exti < EXTI8) {
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SYSCFG_EXTICR2 &= ~(0x000F << shift);
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SYSCFG_EXTICR2 |= (~bits << shift);
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} else if (exti < EXTI12) {
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SYSCFG_EXTICR3 &= ~(0x000F << shift);
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SYSCFG_EXTICR3 |= (~bits << shift);
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} else if (exti < EXTI16) {
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SYSCFG_EXTICR4 &= ~(0x000F << shift);
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SYSCFG_EXTICR4 |= (~bits << shift);
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}
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}
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