From cff706e3ca3823ffb388a4e87c4ef8bf925945c4 Mon Sep 17 00:00:00 2001 From: Fergus Noble Date: Thu, 15 Sep 2011 01:20:45 -0700 Subject: Rename F1 examples folder. --- examples/stm32f1/stm32-h103/exti_both/exti_both.c | 92 +++++++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 examples/stm32f1/stm32-h103/exti_both/exti_both.c (limited to 'examples/stm32f1/stm32-h103/exti_both/exti_both.c') diff --git a/examples/stm32f1/stm32-h103/exti_both/exti_both.c b/examples/stm32f1/stm32-h103/exti_both/exti_both.c new file mode 100644 index 0000000..edfc676 --- /dev/null +++ b/examples/stm32f1/stm32-h103/exti_both/exti_both.c @@ -0,0 +1,92 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2009 Uwe Hermann , + * 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 +#include +#include + +u16 exti_line_state; + +/* Set STM32 to 72 MHz. */ +void clock_setup(void) +{ + rcc_clock_setup_in_hse_8mhz_out_72mhz(); + +} + +void gpio_setup(void) +{ + /* Enable GPIOC clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN); + + /* Set GPIO12 (in GPIO port C) to 'output push-pull'. */ + gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, + GPIO_CNF_OUTPUT_PUSHPULL, GPIO12); +} + +void exti_setup(void) +{ + /* Enable GPIOA clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN); + + /* Enable AFIO clock. */ + rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN); + + /* Enable EXTI0 interrupt */ + nvic_enable_irq(NVIC_EXTI0_IRQ); + + /* Set GPIO0 (in GPIO port A) to 'input float'. */ + gpio_set_mode(GPIOA, GPIO_MODE_INPUT, + GPIO_CNF_INPUT_FLOAT, GPIO0); + + /* configure EXTI subsystem */ + exti_select_source(EXTI0, GPIOA); + exti_set_trigger(EXTI0, EXTI_TRIGGER_BOTH); + exti_enable_request(EXTI0); +} + +void exti0_isr() +{ + exti_line_state = GPIOA_IDR; + + if ((exti_line_state & (1 << 0)) != 0) { + gpio_clear(GPIOC, GPIO12); + } else { + gpio_set(GPIOC, GPIO12); + } + + exti_reset_request(EXTI0); +} + +int main(void) +{ + + clock_setup(); + gpio_setup(); + exti_setup(); + + /* Blink the LED (PC12) on the board. */ + while (1) { + __asm("nop"); + } + + return 0; +} -- cgit v1.2.3