98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/*!
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\file main.c
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\brief the example of EXTI which generates an interrupt request and toggle the LED
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\version 2021-10-30, V1.0.0, firmware for GD32W51x
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*/
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/*
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Copyright (c) 2021, GigaDevice Semiconductor Inc.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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OF SUCH DAMAGE.
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*/
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#include "gd32w51x.h"
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#include "gd32w515p_eval.h"
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void key_gpio_init(void);
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void key_exti_init(void);
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/*!
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\brief main function
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\param[in] none
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\param[out] none
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\retval none
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*/
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int main(void)
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{
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/* configure led GPIO port */
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gd_eval_led_init(LED1);
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/* initialize the key */
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key_gpio_init();
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key_exti_init();
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/* turn on LED1 */
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gd_eval_led_on(LED1);
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while (1){
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}
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}
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/*!
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\brief initialize the key GPIO
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\param[in] none
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\param[out] none
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\retval none
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*/
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void key_gpio_init(void)
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{
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/* enable the WAKEUP key gpio clock */
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rcu_periph_clock_enable(RCU_GPIOA);
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/* configure button pin as input */
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gpio_mode_set(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_NONE, GPIO_PIN_2);
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}
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/*!
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\brief initialize the EXTI configuration of the key
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\param[in] none
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\param[out] none
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\retval none
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*/
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void key_exti_init(void)
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{
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/* enable the CFGCMP clock */
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rcu_periph_clock_enable(RCU_SYSCFG);
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/* configure NVIC priority group */
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nvic_priority_group_set(NVIC_PRIGROUP_PRE2_SUB2);
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/* enable and set key EXTI interrupt to the specified priority */
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nvic_irq_enable(EXTI2_IRQn, 1U, 1U);
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/* connect key EXTI line to key GPIO pin */
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syscfg_exti_line_config(EXTI_SOURCE_GPIOA, EXTI_SOURCE_PIN2);
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/* configure key EXTI line */
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exti_init(EXTI_2, EXTI_INTERRUPT, EXTI_TRIG_FALLING);
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exti_interrupt_flag_clear(EXTI_2);
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}
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