79 lines
2.0 KiB
C
79 lines
2.0 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>,
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* Copyright (C) 2010 Piotr Esden-Tempski <piotr@esden.net>
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* Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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uint16_t exti_line_state;
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/* Set STM32 to 168 MHz. */
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static void clock_setup(void)
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{
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rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_168MHZ]);
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}
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static void gpio_setup(void)
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{
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/* Enable GPIOG clock. */
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rcc_periph_clock_enable(RCC_GPIOG);
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/* Set GPIO13 (in GPIO port G) to 'output push-pull'. */
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gpio_mode_setup(GPIOG, GPIO_MODE_OUTPUT,
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GPIO_PUPD_NONE, GPIO13);
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}
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static void button_setup(void)
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{
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/* Enable GPIOA clock. */
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rcc_periph_clock_enable(RCC_GPIOA);
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/* Set GPIO0 (in GPIO port A) to 'input open-drain'. */
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gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_NONE, GPIO0);
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}
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int main(void)
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{
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int i;
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clock_setup();
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button_setup();
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gpio_setup();
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/* Blink the LED (PD13) on the board. */
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while (1) {
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gpio_toggle(GPIOG, GPIO13);
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/* Upon button press, blink more slowly. */
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exti_line_state = GPIOA_IDR;
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if ((exti_line_state & (1 << 0)) != 0) {
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for (i = 0; i < 3000000; i++) { /* Wait a bit. */
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__asm__("nop");
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}
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}
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for (i = 0; i < 3000000; i++) { /* Wait a bit. */
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__asm__("nop");
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}
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}
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return 0;
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}
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