92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>,
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* 2010 Piotr Esden-Tempski <piotr@esden.net>
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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 <libopenstm32.h>
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/* Set STM32 to 72 MHz. */
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void clock_setup(void)
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{
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/* Select HSI as SYSCLK source. */
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rcc_set_sysclk_source(SW_SYSCLKSEL_HSICLK);
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/* Set the PLL multiplication factor to 9. */
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rcc_set_pll_multiplication_factor(PLLMUL_PLL_CLK_MUL9);
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/* Select HSI/2 as PLL source. */
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rcc_set_pll_source(PLLSRC_HSI_CLK_DIV2);
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rcc_set_pllxtpre(PLLXTPRE_HSE_CLK_DIV2);
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/* Enable PLL oscillator and wait for it to stabilize. */
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rcc_osc_on(PLL);
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rcc_wait_for_osc_ready(PLL);
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/* Select PLL as SYSCLK source. */
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rcc_set_sysclk_source(SW_SYSCLKSEL_PLLCLK);
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}
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void gpio_setup(void)
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{
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/* Enable GPIOC clock. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, IOPCEN);
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/* Set GPIO6 (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, GPIO6 | GPIO7 | GPIO8 | GPIO9);
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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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/* Blink the LED (PC12) on the board. */
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gpio_set(GPIOC, GPIO6);
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while (1) {
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gpio_toggle(GPIOC, GPIO6); /* LED on/off */
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gpio_toggle(GPIOC, GPIO7); /* LED on/off */
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for (i = 0; i < 400000; i++); /* Wait (needs -O0 CFLAGS). */
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gpio_toggle(GPIOC, GPIO7); /* LED on/off */
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gpio_toggle(GPIOC, GPIO8); /* LED on/off */
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for (i = 0; i < 400000; i++); /* Wait (needs -O0 CFLAGS). */
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gpio_toggle(GPIOC, GPIO8); /* LED on/off */
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gpio_toggle(GPIOC, GPIO9); /* LED on/off */
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for (i = 0; i < 400000; i++); /* Wait (needs -O0 CFLAGS). */
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gpio_toggle(GPIOC, GPIO8); /* LED on/off */
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gpio_toggle(GPIOC, GPIO9); /* LED on/off */
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for (i = 0; i < 400000; i++); /* Wait (needs -O0 CFLAGS). */
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gpio_toggle(GPIOC, GPIO7); /* LED on/off */
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gpio_toggle(GPIOC, GPIO8); /* LED on/off */
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for (i = 0; i < 400000; i++); /* Wait (needs -O0 CFLAGS). */
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gpio_toggle(GPIOC, GPIO6); /* LED on/off */
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gpio_toggle(GPIOC, GPIO7); /* LED on/off */
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for (i = 0; i < 400000; i++); /* Wait (needs -O0 CFLAGS). */
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}
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return 0;
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}
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u32 *vector_table[2] __attribute__ ((section(".vectors"))) = {
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(u32 *) 0x20000800, /* Use 2 KB stack (0x800 bytes). */
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(u32 *) main, /* Use main() as reset vector for now. */
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};
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