1、开启时钟与GPIO配置
2、绑定中断
3、编写中断函数
1-2、开启时钟与GPIO配置、绑定中断
void button_init()
{
//使能时钟
rcu_periph_clock_enable(RCU_GPIOA);
//配置GOIO口
gpio_mode_set(GPIOA,GPIO_MODE_INPUT,GPIO_PUPD_NONE,GPIO_PIN_0);
//开中断时钟
rcu_periph_clock_enable(RCU_CFGCMP);
//配置中断优先级
nvic_irq_enable(EXTI0_1_IRQn,0);
//绑定GPIO口
syscfg_exti_line_config(EXTI_SOURCE_GPIOA,EXTI_SOURCE_PIN0);
//初始化中断线
exti_init(EXTI_0,EXTI_INTERRUPT,EXTI_TRIG_RISING);
//清除标志位
exti_interrupt_flag_clear(EXTI_0);
}
GD32E320没有优先级分组,因此不需要配置
3、编写中断函数
void EXTI0_1_IRQHandler(void)
{
if (exti_interrupt_flag_get(EXTI_0) ==1)
{
if(gpio_output_bit_get(GPIOA,GPIO_PIN_8)==SET)
{
gpio_bit_reset(GPIOA,GPIO_PIN_8);
}
else
{
gpio_bit_set(GPIOA,GPIO_PIN_8);
}
exti_interrupt_flag_clear(EXTI_0);
}
}
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