/* * This file is part of the libopencm3 project. * * Copyright (C) 2009 Uwe Hermann * Copyright (C) 2011 Damjan Marion * Copyright (C) 2011 Mark Panajotovic * * 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 #include /* Set STM32 to 168 MHz. */ void clock_setup(void) { rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_168MHZ]); /* Enable GPIOD clock. */ rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPDEN); } void gpio_setup(void) { /* Set GPIO12-15 (in GPIO port D) to 'output push-pull'. */ gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO12 | GPIO13 | GPIO14 | GPIO15); } int main(void) { int i; clock_setup(); gpio_setup(); /* Set two LEDs for wigwag effect when toggling. */ gpio_set(GPIOD, GPIO12 | GPIO14); /* Blink the LEDs (PD12, PD13, PD14 and PD15) on the board. */ while (1) { /* Toggle LEDs. */ gpio_toggle(GPIOD, GPIO12 | GPIO13 | GPIO14 | GPIO15); for (i = 0; i < 6000000; i++) /* Wait a bit. */ __asm__("nop"); } return 0; }