61 lines
1.7 KiB
C
61 lines
1.7 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) 2011 Stephen Caudle <scaudle@doceme.com>
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* Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
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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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#define LED_GREEN_PIN GPIO4
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#define LED_GREEN_PORT GPIOB
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#define LED_RED_PIN GPIO5
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#define LED_RED_PORT GPIOA
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static void gpio_setup(void)
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{
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/* Enable GPIOB clock. */
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rcc_periph_clock_enable(RCC_GPIOA);
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rcc_periph_clock_enable(RCC_GPIOB);
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/* set pins to output mode, push pull */
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gpio_mode_setup(LED_RED_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_RED_PIN);
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gpio_mode_setup(LED_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_GREEN_PIN);
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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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gpio_setup();
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while (1) {
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/* toggle each led in turn */
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gpio_toggle(LED_GREEN_PORT, LED_GREEN_PIN);
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for (i = 0; i < 100000; i++) { /* Wait a bit. */
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__asm__("nop");
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}
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gpio_toggle(LED_RED_PORT, LED_RED_PIN);
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for (i = 0; i < 100000; 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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