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[EXAMPLE:F0] Add simple button example

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This commit is contained in:
Frantisek Burian
2013-12-14 19:16:17 +01:00
committed by Piotr Esden-Tempski
parent a8b3daeb57
commit f176fe59d9
3 changed files with 108 additions and 0 deletions
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examples/stm32/f0/stm32f0-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 = ../stm32f0-discovery.ld
include ../../Makefile.include

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examples/stm32/f0/stm32f0-discovery/button/README Normal file
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This example blinks the green LED on the ST STM32F0DISCOVERY eval board.
When you press the 'USER' button, the blinking is slower.

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examples/stm32/f0/stm32f0-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>
/* Set STM32 to 48 MHz. */
static void clock_setup(void)
{
rcc_clock_setup_in_hsi_out_48mhz();
}
static void gpio_setup(void)
{
/* Enable GPIOD clock. */
rcc_periph_clock_enable(RCC_GPIOC);
/* Set GPIO12 (in GPIO port D) to 'output push-pull'. */
gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT,
GPIO_PUPD_NONE, GPIO8 | GPIO9);
}
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 (PD12) on the board. */
while (1) {
gpio_toggle(GPIOC, GPIO8);
/* Upon button press, blink more slowly. */
if (gpio_get(GPIOA,GPIO0)) {
for (i = 0; i < 300000; i++) /* Wait a bit. */
__asm__("nop");
}
for (i = 0; i < 300000; i++) /* Wait a bit. */
__asm__("nop");
}
return 0;
}