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Added a simple exti test using rising and falling trigger instead of sampling the gpio pin to determine the current state of the pin.

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Piotr Esden-Tempski 2011-01-13 15:10:38 -08:00
parent 9cea5525f6
commit 51a3044232
3 changed files with 153 additions and 0 deletions
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23
examples/stm32/stm32-h103/exti_rising_falling/Makefile Normal file
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
##
## This program is free software: you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This program 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 General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see <http://www.gnu.org/licenses/>.
##
BINARY = exti_rising_falling
include ../../Makefile.include

99
examples/stm32/stm32-h103/exti_rising_falling/exti_rising_falling.c Normal file
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>,
* 2010 Piotr Esden-Tempski <piotr@esden.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/nvic.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/exti.h>
#define FALLING 0
#define RISING 1
u16 exti_direction = FALLING;
/* Set STM32 to 72 MHz. */
void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_72mhz();
}
void gpio_setup(void)
{
/* Enable GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
/* Set GPIO12 (in GPIO port C) to 'output push-pull'. */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
}
void exti_setup(void)
{
/* Enable GPIOA clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
/* Enable AFIO clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN);
/* Enable EXTI0 interrupt */
nvic_enable_irq(NVIC_EXTI0_IRQ);
/* Set GPIO0 (in GPIO port A) to 'input open-drain'. */
gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
GPIO_CNF_INPUT_PULL_UPDOWN, GPIO0);
gpio_set(GPIOA, GPIO0);
/* configure EXTI subsystem */
exti_select_source(EXTI0, GPIOA);
exti_direction = FALLING;
exti_set_trigger(EXTI0, EXTI_TRIGGER_FALLING);
exti_enable_request(EXTI0);
}
void exti0_isr()
{
exti_reset_request(EXTI0);
if (exti_direction == FALLING) {
gpio_set(GPIOC, GPIO12);
exti_direction = RISING;
exti_set_trigger(EXTI0, EXTI_TRIGGER_RISING);
} else {
gpio_clear(GPIOC, GPIO12);
exti_direction = FALLING;
exti_set_trigger(EXTI0, EXTI_TRIGGER_FALLING);
}
}
int main(void)
{
clock_setup();
gpio_setup();
exti_setup();
/* Blink the LED (PC12) on the board. */
while (1) {
__asm("nop");
}
return 0;
}

31
examples/stm32/stm32-h103/exti_rising_falling/exti_rising_falling.ld Normal file
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Linker script for Olimex STM32-H103 (STM32F103RBT6, 128K flash, 20K RAM). */
/* Define memory regions. */
MEMORY
{
rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
}
/* Include the common ld script. */
INCLUDE libopencm3_stm32.ld