3c6e9fd56d
So that the navigation pane works correctly in browsers. Some additional doc fixes put in where found (but many more still to go). Added some dummy .c and .h files to bring the associated docs into line. makefile changed to allow 'make html' as well as 'make doc' (the latter only does html anyway).
156 lines
3.3 KiB
C
156 lines
3.3 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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* 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/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/memorymap.h>
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#include <libopencm3/stm32/exti.h>
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#include <libopencm3/stm32/gpio.h>
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#if !defined(AFIO_BASE)
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# include <libopencm3/stm32/syscfg.h>
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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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EXTI_PR = extis;
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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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return EXTI_PR & exti;
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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, mask = 0x0F;
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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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}
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uint8_t shift = (uint8_t)(4 * (line % 4));
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uint32_t reg = line / 4;
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bits <<= shift;
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mask <<= shift;
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#if defined(AFIO_BASE)
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AFIO_EXTICR(reg) = (AFIO_EXTICR(reg) & ~mask) | bits;
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#else
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SYSCFG_EXTICR(reg) = (SYSCFG_EXTICR(reg) & ~mask) | bits;
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#endif
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};
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}
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/**@}*/
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