/* * This file is part of the libopencm3 project. * * Copyright (C) 2010 Uwe Hermann * Copyright (C) 2012 Michael Ossmann * * This library is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This library 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library. If not, see . */ #include void gpio_setup(void) { GPIO0_DIR |= (1 << 5); /* Configure GPIO0[5] (P6_6) as output. */ } int main(void) { int i; gpio_setup(); /* Blink D2 on the board. */ while (1) { gpio_set(GPIO0, GPIOPIN5); /* LED on */ for (i = 0; i < 800000; i++) /* Wait a bit. */ __asm__("nop"); gpio_clear(GPIO0, GPIOPIN5); /* LED off */ for (i = 0; i < 800000; i++) /* Wait a bit. */ __asm__("nop"); } return 0; }