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Merge pull request #9 from ChuckM/469disco
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‎examples/stm32/f4/stm32f469-discovery/README.md

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Examples for the STM32F469-Discovery board
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------------------------------------------
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This directory contains various examples which use libopencm3 and run on
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the [ST Micro STM32F469-Discovery][disco] board. This board has a number
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of on board peripherals such as a MicroSD card slot, USB OTG connector,
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MEMS microphones, 800 x 450 touch screen graphics, and four user LEDs.
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Additionally the board is loaded with the ST/Link V2.1-1 software which is
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[mBed][] compatible. That means it shows up as a debug device, a disk device,
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and a serial port on the host machine. The examples showing use of the serial
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port configure this port so that additional hardware is not needed.
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[disco]: http://www.st.com/web/catalog/tools/FM116/CL1620/SC959/SS1532/LN1848/PF262395
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[mBed]: http://mbed.org/

‎examples/stm32/f4/stm32f469-discovery/blink_fancy/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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## Copyright (C) 2009 Uwe Hermann <[email protected]>
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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_fancy
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LDSCRIPT = ../stm32f469-discovery.ld
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include ../../Makefile.include
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‎examples/stm32/f4/stm32f469-discovery/blink_fancy/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 STM32F469IDISCOVERY eval board. It should blink
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the LEDs on the board.
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## Board connections
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*none required*

‎examples/stm32/f4/stm32f469-discovery/blink_fancy/blink_fancy.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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* Copyright (C) 2009 Uwe Hermann <[email protected]>
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* Copyright (C) 2011 Damjan Marion <[email protected]>
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* Copyright (C) 2011 Mark Panajotovic <[email protected]>
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* Copyright (C) 2015 Piotr Esden-Tempski <[email protected]>
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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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/* Set STM32 to 168 MHz. */
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static void clock_setup(void)
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{
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rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
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/* Enable GPIOD, GPIOG, and GPIOK clock. */
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rcc_periph_clock_enable(RCC_GPIOD);
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rcc_periph_clock_enable(RCC_GPIOG);
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rcc_periph_clock_enable(RCC_GPIOK);
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}
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static void gpio_setup(void)
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{
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/* Set GPIO6 (in GPIO port G) to 'output push-pull'. */
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gpio_mode_setup(GPIOG, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO6);
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/* Set GPIO4 and GPIO5 (in GPIO port D) to 'output push-pull'. */
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gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO4 | GPIO5);
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/* Set GPIO3 (in GPIO port K) to 'output push-pull'. */
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gpio_mode_setup(GPIOK, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO3);
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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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clock_setup();
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gpio_setup();
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/* Set two LEDs for wigwag effect when toggling. */
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gpio_set(GPIOG, GPIO6);
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gpio_set(GPIOK, GPIO3);
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/* Blink the LEDs (PG13 and PG14) on the board. */
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while (1) {
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/* Toggle LEDs. */
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gpio_toggle(GPIOG, GPIO6);
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gpio_toggle(GPIOD, GPIO4 | GPIO5);
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gpio_toggle(GPIOK, GPIO3);
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for (i = 0; i < 6000000; 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/stm32f469-discovery/blink_minimal/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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## Copyright (C) 2009 Uwe Hermann <[email protected]>
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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_minimal
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LDSCRIPT = ../stm32f469-discovery.ld
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include ../../Makefile.include
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‎examples/stm32/f4/stm32f469-discovery/blink_minimal/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 STM32F469IDISCOVERY 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/stm32f469-discovery/blink_minimal/blink_minimal.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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* Copyright (C) 2009 Uwe Hermann <[email protected]>
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* Copyright (C) 2011 Stephen Caudle <[email protected]>
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* Copyright (C) 2015 Piotr Esden-Tempski <[email protected]>
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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 GPIOD clock. */
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/* Manually: */
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/* RCC_AHB1ENR |= RCC_AHB1ENR_IOPGEN; */
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/* Using API functions: */
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rcc_periph_clock_enable(RCC_GPIOG);
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/* Set GPIO13 (in GPIO port G) to 'output push-pull'. */
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/* Manually: */
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/* GPIOG_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << 2); */
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/* GPIOG_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << 2); */
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/* Using API functions: */
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gpio_mode_setup(GPIOG, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO6);
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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 (PG13) on the board. */
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while (1) {
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/* Manually: */
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#if 0
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GPIOG_BSRR = GPIO13; /* 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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}
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GPIOG_BRR = GPIO13; /* 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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}
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#endif
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/* Using API functions gpio_set()/gpio_clear(): */
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#if 0
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gpio_set(GPIOG, GPIO13); /* 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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}
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gpio_clear(GPIOG, GPIO13); /* 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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}
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#endif
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/* Using API function gpio_toggle(): */
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gpio_toggle(GPIOG, GPIO6); /* 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/stm32f469-discovery/blink_systick/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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## Copyright (C) 2009 Uwe Hermann <[email protected]>
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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_systick
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LDSCRIPT = ../stm32f469-discovery.ld
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include ../../Makefile.include
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‎examples/stm32/f4/stm32f469-discovery/blink_systick/README.md

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# README
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This example is the similar to blink\_fancy except that it uses the
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systick timer to generate time accurate delays. Shows how to set
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up the systick timer to create an interrupt every millisecond and
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how to write a delay routine (msleep) that can then delay for a
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specific number of milliseconds.
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## Board connections
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*none required*

‎examples/stm32/f4/stm32f469-discovery/blink_systick/blink_systick.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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* Copyright (C) 2009 Uwe Hermann <[email protected]>
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* Copyright (C) 2011 Damjan Marion <[email protected]>
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* Copyright (C) 2011 Mark Panajotovic <[email protected]>
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* Copyright (C) 2013 Chuck McManis <[email protected]>
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* Copyright (C) 2015 Piotr Esden-Tempski <[email protected]>
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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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/* This version derived from fancy blink */
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/cm3/systick.h>
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/* monotonically increasing number of milliseconds from reset
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* overflows every 49 days if you're wondering
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*/
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volatile uint32_t system_millis;
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/* Called when systick fires */
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void sys_tick_handler(void)
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{
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system_millis++;
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}
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/* sleep for delay milliseconds */
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static void msleep(uint32_t delay)
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{
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uint32_t wake = system_millis + delay;
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while (wake > system_millis);
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}
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/*
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* systick_setup(void)
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*
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* This function sets up the 1khz "system tick" count. The SYSTICK counter is a
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* standard feature of the Cortex-M series.
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*/
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static void systick_setup(void)
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{
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/* clock rate / 1000 to get 1mS interrupt rate */
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systick_set_reload(168000);
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systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
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systick_counter_enable();
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/* this done last */
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systick_interrupt_enable();
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}
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/* Set STM32 system clock to 168 MHz. */
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static void clock_setup(void)
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{
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rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
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/* Enable GPIOD clock. */
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rcc_periph_clock_enable(RCC_GPIOD);
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}
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static void gpio_setup(void)
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{
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/* Set GPIO4-5 (in GPIO port D) to 'output push-pull'. */
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gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
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GPIO4 | GPIO5);
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}
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int main(void)
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{
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clock_setup();
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gpio_setup();
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systick_setup();
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/* Set two LEDs for wigwag effect when toggling. */
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gpio_set(GPIOD, GPIO4);
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/* Blink the LEDs (PG13 and PG14) on the board. */
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while (1) {
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gpio_toggle(GPIOD, GPIO4 | GPIO5);
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msleep(100);
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}
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return 0;
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}

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