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[examples] Added systick example for obldc strip.

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This commit is contained in:
Piotr Esden-Tempski 2012-11-11 20:37:18 -08:00
parent d1e789b5b7
commit 7006d3c457
2 changed files with 106 additions and 0 deletions
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25
examples/stm32/f1/obldc-strip/systick/Makefile Normal file
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
##
## 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 <http://www.gnu.org/licenses/>.
##
BINARY = systick
LDSCRIPT = ../obldc-strip.ld
include ../../Makefile.include

81
examples/stm32/f1/obldc-strip/systick/systick.c Normal file
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2012 Piotr Esden-Tempski <piotr@esden.net>
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/flash.h>
#include <libopencm3/stm32/f1/gpio.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/cm3/systick.h>
u32 temp32;
void gpio_setup(void)
{
/* Enable alternate function peripheral clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN);
/* Enable GPIOB clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
gpio_clear(GPIOB, GPIO4); /* LED green on */
gpio_set(GPIOB, GPIO5); /* LED red off */
/* Set GPIO4/5 (in GPIO port B) to 'output push-pull' for the LEDs. */
gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO4);
gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO5);
AFIO_MAPR |= AFIO_MAPR_SWJ_CFG_FULL_SWJ_NO_JNTRST;
}
void sys_tick_handler(void)
{
temp32++;
/* We call this handler every 1ms so 1000ms = 1s on/off. */
if (temp32 == 1000) {
gpio_toggle(GPIOB, GPIO4); /* LED green on/off */
gpio_toggle(GPIOB, GPIO5); /* LED red on/off */
temp32 = 0;
}
}
int main(void)
{
rcc_clock_setup_in_hsi_out_64mhz();
gpio_setup();
temp32 = 0;
/* 64MHz / 8 => 8000000 counts per second */
systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8);
/* 8000000/8000 = 1000 overflows per second - every 1ms one interrupt */
systick_set_reload(8000);
systick_interrupt_enable();
/* Start counting. */
systick_counter_enable();
while (1); /* Halt. */
return 0;
}