62 lines
1.8 KiB
C
62 lines
1.8 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 Damjan Marion <damjan.marion@gmail.com>
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* Copyright (C) 2011 Mark Panajotovic <marko@electrontube.org>
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* Copyright (C) 2013 Joshua Harlan Lifton <joshua.harlan.lifton@gmail.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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/* Set STM32 to 24 MHz. */
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static void clock_setup(void)
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{
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rcc_clock_setup_in_hse_8mhz_out_24mhz();
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/* Enable GPIOC clock. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
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}
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static void gpio_setup(void)
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{
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/* Set GPIO9-12 (in GPIO port C) to 'output push-pull'. */
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL,
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GPIO9 | GPIO10 | GPIO11 | 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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clock_setup();
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gpio_setup();
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/* Set two LEDs for wigwag effect when toggling. */
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gpio_set(GPIOC, GPIO9 | GPIO11);
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/* Blink the LEDs (PC9 - PC12) on the board. */
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while (1) {
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gpio_toggle(GPIOC, GPIO9 | GPIO10 | GPIO11 | GPIO12);
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for (i = 0; i < 2000000; 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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