72 lines
2.1 KiB
C
72 lines
2.1 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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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU 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 program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/f1/rcc.h>
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#include <libopencm3/stm32/f1/gpio.h>
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void gpio_setup(void)
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{
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/* Enable GPIOC clock. */
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/* Manually: */
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// RCC_APB2ENR |= RCC_APB2ENR_IOPCEN;
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/* Using API functions: */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
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/* Set GPIO12 (in GPIO port C) to 'output push-pull'. */
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/* Manually: */
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// GPIOC_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << (((12 - 8) * 4) + 2));
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// GPIOC_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << ((12 - 8) * 4));
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/* Using API functions: */
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
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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 (PC12) on the board. */
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while (1) {
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/* Manually: */
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// GPIOC_BSRR = GPIO12; /* LED off */
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// for (i = 0; i < 800000; i++) /* Wait a bit. */
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// __asm__("nop");
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// GPIOC_BRR = GPIO12; /* LED on */
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// for (i = 0; i < 800000; i++) /* Wait a bit. */
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// __asm__("nop");
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/* Using API functions gpio_set()/gpio_clear(): */
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// gpio_set(GPIOC, GPIO12); /* LED off */
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// for (i = 0; i < 800000; i++) /* Wait a bit. */
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// __asm__("nop");
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// gpio_clear(GPIOC, GPIO12); /* LED on */
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// for (i = 0; i < 800000; i++) /* Wait a bit. */
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// __asm__("nop");
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/* Using API function gpio_toggle(): */
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gpio_toggle(GPIOC, GPIO12); /* LED on/off */
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for (i = 0; i < 800000; i++) /* Wait a bit. */
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__asm__("nop");
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}
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return 0;
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}
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