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181 lines
4.0 KiB
181 lines
4.0 KiB
3 months ago
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/** @addtogroup exti_file EXTI peripheral API
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* @ingroup peripheral_apis
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*/
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/*
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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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* Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
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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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* This provides the code for the "next gen" EXTI block provided in F2/F4/F7/L1
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* devices. (differences only in the source selection)
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*/
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/**@{*/
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#include <libopencm3/stm32/exti.h>
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#include <libopencm3/stm32/gpio.h>
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#if defined(EXTI_EXTICR)
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#define EXTICR_SELECTION_FIELDSIZE EXTI_EXTICR_FIELDSIZE
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#define EXTICR_SELECTION_REG(x) EXTI_EXTICR(x)
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#elif defined(AFIO_EXTICR)
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#define EXTICR_SELECTION_FIELDSIZE AFIO_EXTICR_FIELDSIZE
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#define EXTICR_SELECTION_REG(x) AFIO_EXTICR(x)
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#else
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#include <libopencm3/stm32/syscfg.h>
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#define EXTICR_SELECTION_FIELDSIZE SYSCFG_EXTICR_FIELDSIZE
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#define EXTICR_SELECTION_REG(x) SYSCFG_EXTICR(x)
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#endif
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void exti_set_trigger(uint32_t extis, enum 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(uint32_t 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(uint32_t 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(uint32_t extis)
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{
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#if defined(EXTI_RPR1) && defined(EXTI_FPR1)
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EXTI_RPR1 = extis;
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EXTI_FPR1 = extis;
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#else
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EXTI_PR = extis;
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#endif
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}
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/*
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* Check the flag of a given EXTI interrupt.
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* */
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uint32_t exti_get_flag_status(uint32_t exti)
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{
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#if defined(EXTI_RPR1) && defined(EXTI_FPR1)
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return (EXTI_RPR1 & exti) | (EXTI_FPR1 & exti);
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#else
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return EXTI_PR & exti;
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#endif
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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(uint32_t exti, uint32_t gpioport)
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{
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uint32_t line;
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for (line = 0; line < 16; line++) {
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if (!(exti & (1 << line))) {
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continue;
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}
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uint32_t bits = 0;
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switch (gpioport) {
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case GPIOA:
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bits = 0;
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break;
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case GPIOB:
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bits = 1;
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break;
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case GPIOC:
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bits = 2;
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break;
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case GPIOD:
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bits = 3;
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break;
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#if defined(GPIOE) && defined(GPIO_PORT_E_BASE)
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case GPIOE:
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bits = 4;
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break;
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#endif
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#if defined(GPIOF) && defined(GPIO_PORT_F_BASE)
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case GPIOF:
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bits = 5;
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break;
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#endif
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#if defined(GPIOG) && defined(GPIO_PORT_G_BASE)
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case GPIOG:
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bits = 6;
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break;
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#endif
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#if defined(GPIOH) && defined(GPIO_PORT_H_BASE)
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case GPIOH:
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bits = 7;
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break;
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#endif
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#if defined(GPIOI) && defined(GPIO_PORT_I_BASE)
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case GPIOI:
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bits = 8;
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break;
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#endif
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#if defined(GPIOJ) && defined(GPIO_PORT_J_BASE)
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case GPIOJ:
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bits = 9;
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break;
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#endif
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#if defined(GPIOK) && defined(GPIO_PORT_K_BASE)
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case GPIOK:
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bits = 10;
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break;
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#endif
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}
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uint8_t shift = (uint8_t)(EXTICR_SELECTION_FIELDSIZE * (line % 4));
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uint32_t mask = ((1 << EXTICR_SELECTION_FIELDSIZE) - 1) << shift;
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uint32_t reg = line / 4;
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EXTICR_SELECTION_REG(reg) = (EXTICR_SELECTION_REG(reg) & ~mask) | (bits << shift);
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};
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}
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/**@}*/
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