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Port button example to WaveShare Open103R

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This commit is contained in:
Joshua Harlan Lifton
2013-09-07 22:08:53 -07:00
committed by Piotr Esden-Tempski
parent f1bb59e19c
commit c672f1b329
3 changed files with 112 additions and 0 deletions
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26
examples/stm32/f1/waveshare-open103r/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>
## Copyright (C) 2013 Joshua Harlan Lifton <joshua.harlan.lifton@gmail.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/>.
##
BINARY = button
LDSCRIPT = ../waveshare-open103r.ld
include ../../Makefile.include

8
examples/stm32/f1/waveshare-open103r/button/README Normal file
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This example blinks LED1 on the WaveShare Open103R eval board.
When you press the 'USER' button, the blinking is slower.

78
examples/stm32/f1/waveshare-open103r/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) 2013 Joshua Harlan Lifton <joshua.harlan.lifton@gmail.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 24 MHz. */
static void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_24mhz();
}
static void gpio_setup(void)
{
/* Enable GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
/* Set GPIO9 (in GPIO port C) to 'output push-pull'. */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO9);
}
static void button_setup(void)
{
/* Enable GPIOA clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
/* Set GPIO9 (in GPIO port A) to 'input with pull-up resistor'. */
gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
GPIO_CNF_INPUT_PULL_UPDOWN, GPIO9);
gpio_set(GPIOA, GPIO9);
}
int main(void)
{
int i;
clock_setup();
gpio_setup();
button_setup();
/* Blink LED1 (PC9) on the board. */
while (1) {
gpio_toggle(GPIOC, GPIO9);
/* Upon button press, blink more slowly. */
exti_line_state = GPIOA_IDR;
if ((exti_line_state & (1 << 9)) == 0) {
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("nop");
}
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("nop");
}
return 0;
}