前一篇帖子用PinRead来读取按键的状态，

R_IOPORT_PinRead(&g_ioport_ctrl,BSP_IO_PORT_00_PIN_04, &Pin_P004);

这个方法，实时性不是很高，所以如果想实现高效的按键检测，需要引入外部中断检测来实现。

配置按键的中断

1、按下图创建两个中断：

2、按下图配置中断：

配置好后同步工程
3、hal_entry函数如下：

bsp_io_level_t button2_status = BSP_IO_LEVEL_LOW;                                           //定义按键状态
bsp_io_level_t button3_status = BSP_IO_LEVEL_LOW;

void button1_callback(external_irq_callback_args_t *p_args)
{
	(void) p_args;
	R_IOPORT_PinWrite(&g_ioport_ctrl, LED_Red, button2_status); //反转LED灯状态
	button2_status =~button2_status;
	
}

void button2_callback(external_irq_callback_args_t *p_args)
{
	(void) p_args;
	R_IOPORT_PinWrite(&g_ioport_ctrl, LED_Bule, button3_status);
	button3_status =~button3_status;
	
}
/*******************************************************************************************************************//**
 * main() is generated by the RA Configuration editor and is used to generate threads if an RTOS is used.  This function
 * is called by main() when no RTOS is used.
 **********************************************************************************************************************/
void hal_entry(void)
{
    /* TODO: add your own code here */
	

	LED_Init();
        /* IRQ初始化函数 */
	R_ICU_ExternalIrqOpen(button1.p_ctrl,button1.p_cfg);
        R_ICU_ExternalIrqEnable(button1.p_ctrl); 
        R_ICU_ExternalIrqOpen(button2.p_ctrl, button2.p_cfg);
        R_ICU_ExternalIrqEnable(button2.p_ctrl);
	while(1)
	{
		R_BSP_SoftwareDelay(10, BSP_DELAY_UNITS_MILLISECONDS);
	}

上传开发板后，按下sw2 或者sw3，就可以很灵敏的控制红灯跟蓝灯的亮与来。