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stm32f469: Add utility code
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‎examples/stm32/f4/stm32f469-discovery/console/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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OBJS = ../util/clock.o ../util/console.o
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BINARY = main
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LDSCRIPT = ../stm32f469-discovery.ld
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include ../../Makefile.include
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‎examples/stm32/f4/stm32f469-discovery/console/README.md‎

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Console Example
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---------------
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These examples include some helper functions, one set are the
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clock setup for the board and the console function with has
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some basic support for sending strings to and from the debug
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part on the STM32F469-Discovery board.
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The main function simply initializes the console for 115200
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baud and sets up a very simple interactive loop. Reset on
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control-C is enabled so when the example is running, if you
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hold the control key and C the board will reset and restart.

‎examples/stm32/f4/stm32f469-discovery/console/main.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) 2013 Chuck McManis <[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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/*
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* USART example (alternate console)
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*/
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#include <stdint.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/usart.h>
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#include "../util/clock.h"
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#include "../util/console.h"
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/*
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* Set up the GPIO subsystem with an "Alternate Function"
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* on some of the pins, in this case connected to a
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* USART.
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*/
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int main(void)
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{
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char buf[128];
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int len;
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clock_setup(); /* initialize our clock */
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console_setup(115200);
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/* At this point our console is ready to go so we can create our
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* simple application to run on it.
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*/
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console_puts("\nUART Demonstration Application\n");
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while (1) {
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console_puts("Enter a string: ");
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len = console_gets(buf, 128);
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if (len) {
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console_puts("\nYou entered : '");
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console_puts(buf);
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console_puts("'\n");
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} else {
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console_puts("\nNo string entered\n");
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}
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}
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}

‎examples/stm32/f4/stm32f469-discovery/util/README.md‎

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Utility Functions
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-----------------
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Not part of the library, these utility functions provide some
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helper functions for the examples that simplify things.
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‎examples/stm32/f4/stm32f469-discovery/util/clock.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) 2013 Chuck McManis <[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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/*
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* Now this is just the clock setup code from systick-blink as it is the
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* transferrable part.
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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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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/cm3/systick.h>
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/* Common function descriptions */
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#include "../util/clock.h"
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/* milliseconds since boot */
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static volatile uint32_t system_millis;
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/* millisecond count down when sleeping */
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static volatile uint32_t system_delay;
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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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if (system_delay != 0) {
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system_delay--;
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}
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}
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/* simple sleep for delay milliseconds */
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void msleep(uint32_t delay)
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{
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system_delay = delay;
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while (system_delay > 0);
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}
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/* Getter function for the current time */
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uint32_t mtime(void)
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{
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return system_millis;
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}
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/*
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* clock_setup(void)
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*
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* This function sets up both the base board clock rate
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* and a 1khz "system tick" count. The SYSTICK counter is
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* a standard feature of the Cortex-M series.
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*/
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void clock_setup(void)
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{
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/* Base board frequency, set to 168Mhz */
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rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
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/* clock rate / 168000 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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}

‎examples/stm32/f4/stm32f469-discovery/util/clock.h‎

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/*
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* This include file describes the functions exported by clock.c
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*/
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#ifndef __CLOCK_H
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#define __CLOCK_H
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/*
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* Definitions for functions being abstracted out
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*/
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void msleep(uint32_t);
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uint32_t mtime(void);
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void clock_setup(void);
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#endif /* generic header protector */
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