92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/*
|
|
* This file is part of the libopencm3 project.
|
|
*
|
|
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
|
|
* Copyright (C) 2011 Damjan Marion <damjan.marion@gmail.com>
|
|
* Copyright (C) 2011 Mark Panajotovic <marko@electrontube.org>
|
|
* Copyright (C) 2013 Chuck McManis <cmcmanis@mcmanis.com>
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
/* This version derived from fancy blink */
|
|
|
|
#include <libopencm3/stm32/rcc.h>
|
|
#include <libopencm3/stm32/gpio.h>
|
|
#include <libopencm3/cm3/nvic.h>
|
|
#include <libopencm3/cm3/systick.h>
|
|
|
|
/* monotonically increasing number of milliseconds from reset
|
|
* overflows every 49 days if you're wondering
|
|
*/
|
|
volatile uint32_t system_millis;
|
|
|
|
/* Called when systick fires */
|
|
void sys_tick_handler(void)
|
|
{
|
|
system_millis++;
|
|
}
|
|
|
|
/* sleep for delay milliseconds */
|
|
static void msleep(uint32_t delay)
|
|
{
|
|
uint32_t wake = system_millis + delay;
|
|
while (wake > system_millis);
|
|
}
|
|
|
|
/* Set up a timer to create 1mS ticks. */
|
|
static void systick_setup(void)
|
|
{
|
|
/* clock rate / 1000 to get 1mS interrupt rate */
|
|
systick_set_reload(168000);
|
|
systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
|
|
systick_counter_enable();
|
|
/* this done last */
|
|
systick_interrupt_enable();
|
|
}
|
|
|
|
/* Set STM32 to 168 MHz. */
|
|
static void clock_setup(void)
|
|
{
|
|
rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_168MHZ]);
|
|
|
|
/* Enable GPIOG clock. */
|
|
rcc_periph_clock_enable(RCC_GPIOG);
|
|
}
|
|
|
|
static void gpio_setup(void)
|
|
{
|
|
/* Set GPIO13-14 (in GPIO port G) to 'output push-pull'. */
|
|
gpio_mode_setup(GPIOG, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
|
|
GPIO13 | GPIO14);
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
clock_setup();
|
|
gpio_setup();
|
|
systick_setup();
|
|
|
|
/* Set two LEDs for wigwag effect when toggling. */
|
|
gpio_set(GPIOG, GPIO13);
|
|
|
|
/* Blink the LEDs (PG13 and PG14) on the board. */
|
|
while (1) {
|
|
gpio_toggle(GPIOG, GPIO13 | GPIO14);
|
|
msleep(100);
|
|
}
|
|
|
|
return 0;
|
|
}
|