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Piotr Esden-Tempski
2013-04-19 17:19:32 -07:00
commit 9d5526f773
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examples/stm32/f1/stm32-maple/miniblink/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 = miniblink
LDSCRIPT = ../stm32-maple.ld
include ../../Makefile.include

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examples/stm32/f1/stm32-maple/miniblink/README Normal file
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This is the smallest-possible example program using libopencm3.
It's intended for the ST STM32-based Leaf Labs Maple board (see
http://leaflabs.com for details). It should blink the LED on the board.

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examples/stm32/f1/stm32-maple/miniblink/miniblink.c 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/>.
*/
#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/gpio.h>
static void gpio_setup(void)
{
/* Enable GPIOA clock. */
/* Manually: */
// RCC_APB2ENR |= RCC_APB2ENR_IOPCEN;
/* Using API functions: */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
/* Set GPIO5 (in GPIO port A) to 'output push-pull'. */
/* Manually: */
// GPIOA_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << (((5 - 8) * 4) + 2));
// GPIOA_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << ((5 - 8) * 4));
/* Using API functions: */
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO5);
}
int main(void)
{
int i;
gpio_setup();
/* Blink the LED (PA5) on the board. */
while (1) {
/* Manually: */
// GPIOA_BSRR = GPIO5; /* LED off */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
// GPIOA_BRR = GPIO5; /* LED on */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
/* Using API functions gpio_set()/gpio_clear(): */
// gpio_set(GPIOA, GPIO5); /* LED off */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
// gpio_clear(GPIOA, GPIO5); /* LED on */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
/* Using API function gpio_toggle(): */
gpio_toggle(GPIOA, GPIO5); /* LED on/off */
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("nop");
}
return 0;
}