/* * This file is part of the libopenstm32 project. * * Copyright (C) 2009 Uwe Hermann * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include int main(void) { int i; /* Enable GPIOC clock. */ RCC_APB2ENR = RCC_IOPCEN; /* Set GPIO12 (in GPIO port C) to 'output push-pull'. */ /* Manually: */ // GPIOC_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << (((12 - 8) * 4) + 2)); // GPIOC_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << ((12 - 8) * 4)); /* Using API functions: */ gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO12); /* Blink the LED (PC12) on the board. */ while (1) { /* Manually: */ // GPIOC_BSRR = GPIO12; /* LED off */ // for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */ // GPIOC_BRR = GPIO12; /* LED on */ // for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */ /* Using API functions gpio_set()/gpio_clear(): */ // gpio_set(GPIOC, GPIO12); /* LED off */ // for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */ // gpio_clear(GPIOC, GPIO12); /* LED on */ // for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */ /* Using API function gpio_toggle(): */ gpio_toggle(GPIOC, GPIO12); /* LED on/off */ for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */ } return 0; } u32 *vector_table[2] __attribute__ ((section(".vectors"))) = { (u32 *)0x20000800, /* Use 2 KB stack (0x800 bytes). */ (u32 *)main, /* Use main() as reset vector for now. */ };