程序设计

修改key.c

#include "key.h"

uint8_t key_scan(void)
{
	static uint8_t key_up = 1;//按键状态变量
	uint8_t keyval = 0;//按键值变量

	if(key_up && (KEY0 == 0||KEY1 == 0||KEY2 == 0))
	{
		HAL_Delay(10);//去抖
		key_up = 0;//按键被按下
		if(KEY0 == 0)
			keyval = KEY0_PRES;
		if(KEY1 == 0)
			keyval = KEY1_PRES;
		if(KEY2 == 0)
			keyval = KEY2_PRES;
	}
	if(KEY0 == 1&&KEY1 == 1&&KEY2 == 1)
	{
		key_up = 1;//按键抬起
	}
	return keyval;//返回键值
}

修改key.h

#include "main.h"

#define KEY0        HAL_GPIO_ReadPin(KEY0_GPIO_Port, KEY0_Pin)
#define KEY1        HAL_GPIO_ReadPin(KEY1_GPIO_Port, KEY1_Pin)
#define KEY2        HAL_GPIO_ReadPin(KEY2_GPIO_Port, KEY2_Pin)

#define KEY0_PRES    1              /* KEY0 按下 */
#define KEY1_PRES    2              /* KEY1 按下 */
#define KEY2_PRES    3              /* KEY2 按下 */

uint8_t key_scan(void);

修改main.c

在main.c中添加头文件

#include "KEY/key.h"

在主函数中调用按键扫描函数

key = key_scan();
if(key == 1)
{
	hint();
	printf("1\r\n");
}
if(key == 2)
{
	hint();
	printf("2\r\n");
}
if(key == 3)
{
	hint();
	printf("3\r\n");
}