/* * This file is part of the libopencm3 project. * * Copyright (C) 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 void gpio_setup(void); void led_on(void); void led_off(void); bool pb0_get(void); bool pb1_get(void); /** @file * Example for switching the User LED of the EFM32-TG-STK330 eval board on and * off using the buttons. */ int main(void) { gpio_setup(); while(1) { if (pb0_get()) led_on(); if (pb1_get()) led_off(); }; } /** * Enable GPIO, and set up port D7 as an output pin. */ void gpio_setup(void) { // 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_set_mode(GPIO_PD, GPIO_MODE_PUSHPULL, GPIO7); // Button PB0 is connected to pin PD8 and pulled low when pushed, // Botton PB1 to pin PB11 (sources as for LED). Pullups and debouncing // are alreay in place in hardware, so no filtering or pullup is // needed. gpio_set_mode(GPIO_PD, GPIO_MODE_INPUT, GPIO8); gpio_set_mode(GPIO_PB, GPIO_MODE_INPUT, GPIO11); } void led_on(void) { gpio_set(GPIO_PD, GPIO7); } void led_off(void) { gpio_clear(GPIO_PD, GPIO7); } bool pb0_get(void) { return !gpio_get(GPIO_PD, GPIO8); } bool pb1_get(void) { return !gpio_get(GPIO_PB, GPIO11); }