82 lines
2.2 KiB
C
82 lines
2.2 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) 2015 Piotr Esden-Tempski <piotr@esden.net>
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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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static void gpio_setup(void)
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{
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/* Enable GPIOD clock. */
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/* Manually: */
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/* RCC_AHB1ENR |= RCC_AHB1ENR_IOPGEN; */
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/* Using API functions: */
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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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/* Manually: */
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/* GPIOG_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << 2); */
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/* GPIOG_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << 2); */
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/* Using API functions: */
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gpio_mode_setup(GPIOG, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO13);
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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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/* Blink the LED (PG13) on the board. */
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while (1) {
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/* Manually: */
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#if 0
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GPIOG_BSRR = GPIO13; /* LED off */
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for (i = 0; i < 1000000; i++) { /* Wait a bit. */
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__asm__("nop");
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}
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GPIOG_BRR = GPIO13; /* LED on */
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for (i = 0; i < 1000000; i++) { /* Wait a bit. */
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__asm__("nop");
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}
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#endif
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/* Using API functions gpio_set()/gpio_clear(): */
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#if 0
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gpio_set(GPIOG, GPIO13); /* LED off */
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for (i = 0; i < 1000000; i++) { /* Wait a bit. */
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__asm__("nop");
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}
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gpio_clear(GPIOG, GPIO13); /* LED on */
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for (i = 0; i < 1000000; i++) { /* Wait a bit. */
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__asm__("nop");
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}
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#endif
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/* Using API function gpio_toggle(): */
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gpio_toggle(GPIOG, GPIO13); /* LED on/off */
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for (i = 0; i < 1000000; 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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