/* * This file is part of the libopencm3 project. * * Copyright (C) 2011 Gareth McMullin * Copyright (C) 2012 Alexandru Gagniuc * * 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 . */ /** * \addtogroup Examples * * Flashes the Red, Green and Blue diodes on the board, in order. * * RED controlled by PF1 * Green controlled by PF3 * Blue controlled by PF2 */ #include #include void gpio_setup(void) { SYSCTL_RCGCGPIO |= 0x20; /* Enable GPIOF in run mode. */ const u32 outpins = ((1<<3) | (1<<2) | (1<<1)); GPIO_DIR(GPIOF) |= outpins; /* Configure outputs. */ GPIO_DEN(GPIOF) |= outpins; /* Enable digital function on outputs. */ } #define FLASH_DELAY 800000 int main(void) { int i; gpio_setup(); /* Blink STATUS LED (PF0) on the board. */ while (1) { /* * Flash the Red diode */ gpio_set(GPIOF, GPIO1); for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */ __asm__("nop"); gpio_clear(GPIOF, GPIO1); for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */ __asm__("nop"); /* * Flash the Green diode */ gpio_set(GPIOF, GPIO3); for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */ __asm__("nop"); gpio_clear(GPIOF, GPIO3); for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */ __asm__("nop"); /* * Flash the Blue diode */ gpio_set(GPIOF, GPIO2); for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */ __asm__("nop"); gpio_clear(GPIOF, GPIO2); for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */ __asm__("nop"); } return 0; }