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[stm32f429i-discovery] Added button example.

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Piotr Esden-Tempski
2015-01-14 18:23:01 -08:00
parent 7bf64424ab
commit 25d924f699
3 changed files with 115 additions and 0 deletions
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examples/stm32/f4/stm32f429i-discovery/button/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 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/>.
##
BINARY = button
LDSCRIPT = ../stm32f429i-discovery.ld
include ../../Makefile.include

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examples/stm32/f4/stm32f429i-discovery/button/README Normal file
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This example blinks the GREEN LED on the ST STM32F429IDISCOVERY eval board.
When you press the 'USER' button, the blinking is slower.
Board connections:
------------------
<none required>

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examples/stm32/f4/stm32f429i-discovery/button/button.c Normal file
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>,
* Copyright (C) 2010 Piotr Esden-Tempski <piotr@esden.net>
* Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
*
* 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/>.
*/
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
uint16_t exti_line_state;
/* Set STM32 to 168 MHz. */
static void clock_setup(void)
{
rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_168MHZ]);
}
static void gpio_setup(void)
{
/* Enable GPIOG clock. */
rcc_periph_clock_enable(RCC_GPIOG);
/* Set GPIO13 (in GPIO port G) to 'output push-pull'. */
gpio_mode_setup(GPIOG, GPIO_MODE_OUTPUT,
GPIO_PUPD_NONE, GPIO13);
}
static void button_setup(void)
{
/* Enable GPIOA clock. */
rcc_periph_clock_enable(RCC_GPIOA);
/* Set GPIO0 (in GPIO port A) to 'input open-drain'. */
gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_NONE, GPIO0);
}
int main(void)
{
int i;
clock_setup();
button_setup();
gpio_setup();
/* Blink the LED (PD13) on the board. */
while (1) {
gpio_toggle(GPIOG, GPIO13);
/* Upon button press, blink more slowly. */
exti_line_state = GPIOA_IDR;
if ((exti_line_state & (1 << 0)) != 0) {
for (i = 0; i < 3000000; i++) { /* Wait a bit. */
__asm__("nop");
}
}
for (i = 0; i < 3000000; i++) { /* Wait a bit. */
__asm__("nop");
}
}
return 0;
}