From 62f3897a2e03a4b935b2ef4b1a694c8923d8e802 Mon Sep 17 00:00:00 2001 From: Uwe Hermann Date: Wed, 9 Feb 2011 02:22:20 +0100 Subject: Add some examples for the STM32-Discovery board. This adds a directory of examples, tested on the STM32-Discovery, just modifications of: button, miniblink, fancyblink, usart, and rtc. Thanks Marko Kraljevic for the patch! --- examples/stm32/stm32-discovery/button/button.c | 75 ++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 examples/stm32/stm32-discovery/button/button.c (limited to 'examples/stm32/stm32-discovery/button/button.c') diff --git a/examples/stm32/stm32-discovery/button/button.c b/examples/stm32/stm32-discovery/button/button.c new file mode 100644 index 0000000..086d850 --- /dev/null +++ b/examples/stm32/stm32-discovery/button/button.c @@ -0,0 +1,75 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2009 Uwe Hermann , + * Copyright (C) 2010 Piotr Esden-Tempski + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include + +u16 exti_line_state; + +/* Set STM32 to 24 MHz. */ +void clock_setup(void) +{ + rcc_clock_setup_in_hse_8mhz_out_24mhz(); +} + +void gpio_setup(void) +{ + /* Enable GPIOC clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN); + + /* Set GPIO9 (in GPIO port C) to 'output push-pull'. */ + gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO9); +} + +void button_setup(void) +{ + /* Enable GPIOA clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN); + + /* Set GPIO0 (in GPIO port A) to 'input open-drain'. */ + gpio_set_mode(GPIOA, GPIO_MODE_INPUT, + GPIO_CNF_INPUT_FLOAT, GPIO0); +} + +int main(void) +{ + int i; + + clock_setup(); + gpio_setup(); + button_setup(); + + /* Blink the LED (PC9) on the board. */ + while (1) { + gpio_toggle(GPIOC, GPIO9); + + exti_line_state = GPIOA_IDR; + if ((exti_line_state & (1 << 0)) != 0) { + for (i = 0; i < 800000; i++) /* Wait a bit. */ + __asm__("nop"); + } + + for (i = 0; i < 800000; i++) /* Wait a bit. */ + __asm__("nop"); + } + + return 0; +} -- cgit v1.2.3