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brabo
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Merge pull request #12 from hyves42/master
Add example blink project for nucleo-f401re board
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‎examples/stm32/f4/nucleo-f401re/blink/Makefile

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##
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## This file is part of the libopencm3 project.
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This library is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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BINARY = blink
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LDSCRIPT = ../nucleo-f401re.ld
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include ../../Makefile.include
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‎examples/stm32/f4/nucleo-f401re/blink/README.md

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# README
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This is the smallest-possible example program using libopencm3.
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It's intended for the ST Nucleo-F401RE eval board. It should blink
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the GREEN LED on the board.
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## Board connections
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*none required*

‎examples/stm32/f4/nucleo-f401re/blink/blink.c

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/*
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* This file is part of the libopencm3 project.
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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static void gpio_setup(void)
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{
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/* Enable GPIOA clock. */
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/* Manually: */
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/*RCC_AHB1ENR |= RCC_AHB1ENR_IOPAEN; */
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/* Using API functions: */
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rcc_periph_clock_enable(RCC_GPIOA);
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/* Set GPIO5 (in GPIO port A) to 'output push-pull'. */
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/* Manually: */
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/*GPIOA_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << (((8 - 8) * 4) + 2)); */
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/*GPIOA_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << ((8 - 8) * 4)); */
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/* Using API functions: */
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gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO5);
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}
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int main(void)
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{
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int i;
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gpio_setup();
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/* Blink the LED (PC8) on the board. */
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while (1) {
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/* Manually: */
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/* GPIOA_BSRR = GPIO5; */ /* LED off */
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/* for (i = 0; i < 1000000; i++) */ /* Wait a bit. */
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/* __asm__("nop"); */
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/* GPIOA_BRR = GPIO5; */ /* LED on */
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/* for (i = 0; i < 1000000; i++) */ /* Wait a bit. */
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/* __asm__("nop"); */
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/* Using API functions gpio_set()/gpio_clear(): */
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/* gpio_set(GPIOA, GPIO5); */ /* LED off */
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/* for (i = 0; i < 1000000; i++) */ /* Wait a bit. */
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/* __asm__("nop"); */
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/* gpio_clear(GPIOA, GPIO5); */ /* LED on */
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/* for (i = 0; i < 1000000; i++) */ /* Wait a bit. */
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/* __asm__("nop"); */
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/* Using API function gpio_toggle(): */
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gpio_toggle(GPIOA, GPIO5); /* LED on/off */
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for (i = 0; i < 1000000; i++) { /* Wait a bit. */
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__asm__("nop");
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}
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}
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return 0;
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}

‎examples/stm32/f4/nucleo-f401re/nucleo-f401re.ld

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/*
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* This file is part of the libopencm3 project.
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Linker script for Nucleo F401RE (STM32F401RE, 512K flash, 96K RAM). */
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/* Define memory regions. */
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MEMORY
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{
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rom (rx) : ORIGIN = 0x08000000, LENGTH = 512K
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ram (rwx) : ORIGIN = 0x20000000, LENGTH = 96K
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}
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/* Include the common ld script. */
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INCLUDE libopencm3_stm32f4.ld
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