/* * This file is part of the libopencm3 project. * * Copyright (C) 2009 Uwe Hermann * 2012 chrysn * * 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 3 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, see . */ #include #include int main(void) { // FIXME: As of now, this doesn't work without x being volatile; an issue with linking? volatile int x; // Before GPIO works, according to d0034_efm32tg_reference_manual.pdf // note in section 28.3.7, we'll have to enable GPIO in CMU_HFPERCLKEN0 CMU_HFPERCLKEN0 |= CMU_HFPERCLKEN0_GPIO; // The User LED is connected to PD7 to the plus side of the LED // according to t0011_efm32_tiny_gecko_stk_user_manual.pdf figures 16.2 // and 16.3 (called UIF_LED0) GPIO_PD_MODEL = GPIO_MODE_PUSHPULL<<(7*4); GPIO_PD_DOUTSET = 1<<7; while(1) { for(x = 0; x < 200000; ++x); GPIO_PD_DOUTTGL = 1<<7; }; }