181 lines
4.0 KiB
C
181 lines
4.0 KiB
C
/** @addtogroup exti_file EXTI peripheral API
|
|
* @ingroup peripheral_apis
|
|
*/
|
|
/*
|
|
* This file is part of the libopencm3 project.
|
|
*
|
|
* Copyright (C) 2010 Mark Butler <mbutler@physics.otago.ac.nz>
|
|
* Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
|
|
*
|
|
* This library is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this library. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* This provides the code for the "next gen" EXTI block provided in F2/F4/F7/L1
|
|
* devices. (differences only in the source selection)
|
|
*/
|
|
/**@{*/
|
|
|
|
|
|
#include <libopencm3/stm32/exti.h>
|
|
#include <libopencm3/stm32/gpio.h>
|
|
|
|
#if defined(EXTI_EXTICR)
|
|
#define EXTICR_SELECTION_FIELDSIZE EXTI_EXTICR_FIELDSIZE
|
|
#define EXTICR_SELECTION_REG(x) EXTI_EXTICR(x)
|
|
#elif defined(AFIO_EXTICR)
|
|
#define EXTICR_SELECTION_FIELDSIZE AFIO_EXTICR_FIELDSIZE
|
|
#define EXTICR_SELECTION_REG(x) AFIO_EXTICR(x)
|
|
#else
|
|
#include <libopencm3/stm32/syscfg.h>
|
|
#define EXTICR_SELECTION_FIELDSIZE SYSCFG_EXTICR_FIELDSIZE
|
|
#define EXTICR_SELECTION_REG(x) SYSCFG_EXTICR(x)
|
|
#endif
|
|
|
|
void exti_set_trigger(uint32_t extis, enum exti_trigger_type trig)
|
|
{
|
|
switch (trig) {
|
|
case EXTI_TRIGGER_RISING:
|
|
EXTI_RTSR |= extis;
|
|
EXTI_FTSR &= ~extis;
|
|
break;
|
|
case EXTI_TRIGGER_FALLING:
|
|
EXTI_RTSR &= ~extis;
|
|
EXTI_FTSR |= extis;
|
|
break;
|
|
case EXTI_TRIGGER_BOTH:
|
|
EXTI_RTSR |= extis;
|
|
EXTI_FTSR |= extis;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void exti_enable_request(uint32_t extis)
|
|
{
|
|
/* Enable interrupts. */
|
|
EXTI_IMR |= extis;
|
|
|
|
/* Enable events. */
|
|
EXTI_EMR |= extis;
|
|
}
|
|
|
|
void exti_disable_request(uint32_t extis)
|
|
{
|
|
/* Disable interrupts. */
|
|
EXTI_IMR &= ~extis;
|
|
|
|
/* Disable events. */
|
|
EXTI_EMR &= ~extis;
|
|
}
|
|
|
|
/*
|
|
* Reset the interrupt request by writing a 1 to the corresponding
|
|
* pending bit register.
|
|
*/
|
|
void exti_reset_request(uint32_t extis)
|
|
{
|
|
#if defined(EXTI_RPR1) && defined(EXTI_FPR1)
|
|
EXTI_RPR1 = extis;
|
|
EXTI_FPR1 = extis;
|
|
#else
|
|
EXTI_PR = extis;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Check the flag of a given EXTI interrupt.
|
|
* */
|
|
uint32_t exti_get_flag_status(uint32_t exti)
|
|
{
|
|
#if defined(EXTI_RPR1) && defined(EXTI_FPR1)
|
|
return (EXTI_RPR1 & exti) | (EXTI_FPR1 & exti);
|
|
#else
|
|
return EXTI_PR & exti;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Remap an external interrupt line to the corresponding pin on the
|
|
* specified GPIO port.
|
|
*
|
|
* TODO: This could be rewritten in fewer lines of code.
|
|
*/
|
|
void exti_select_source(uint32_t exti, uint32_t gpioport)
|
|
{
|
|
uint32_t line;
|
|
for (line = 0; line < 16; line++) {
|
|
if (!(exti & (1 << line))) {
|
|
continue;
|
|
}
|
|
|
|
uint32_t bits = 0;
|
|
|
|
switch (gpioport) {
|
|
case GPIOA:
|
|
bits = 0;
|
|
break;
|
|
case GPIOB:
|
|
bits = 1;
|
|
break;
|
|
case GPIOC:
|
|
bits = 2;
|
|
break;
|
|
case GPIOD:
|
|
bits = 3;
|
|
break;
|
|
#if defined(GPIOE) && defined(GPIO_PORT_E_BASE)
|
|
case GPIOE:
|
|
bits = 4;
|
|
break;
|
|
#endif
|
|
#if defined(GPIOF) && defined(GPIO_PORT_F_BASE)
|
|
case GPIOF:
|
|
bits = 5;
|
|
break;
|
|
#endif
|
|
#if defined(GPIOG) && defined(GPIO_PORT_G_BASE)
|
|
case GPIOG:
|
|
bits = 6;
|
|
break;
|
|
#endif
|
|
#if defined(GPIOH) && defined(GPIO_PORT_H_BASE)
|
|
case GPIOH:
|
|
bits = 7;
|
|
break;
|
|
#endif
|
|
#if defined(GPIOI) && defined(GPIO_PORT_I_BASE)
|
|
case GPIOI:
|
|
bits = 8;
|
|
break;
|
|
#endif
|
|
#if defined(GPIOJ) && defined(GPIO_PORT_J_BASE)
|
|
case GPIOJ:
|
|
bits = 9;
|
|
break;
|
|
#endif
|
|
#if defined(GPIOK) && defined(GPIO_PORT_K_BASE)
|
|
case GPIOK:
|
|
bits = 10;
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
uint8_t shift = (uint8_t)(EXTICR_SELECTION_FIELDSIZE * (line % 4));
|
|
uint32_t mask = ((1 << EXTICR_SELECTION_FIELDSIZE) - 1) << shift;
|
|
uint32_t reg = line / 4;
|
|
|
|
EXTICR_SELECTION_REG(reg) = (EXTICR_SELECTION_REG(reg) & ~mask) | (bits << shift);
|
|
};
|
|
}
|
|
/**@}*/
|
|
|