【NUCLEO-L496ZG-P 试用体验】按键控制打印输出

//mode ---value 1:long press 

//     ---value 0:short press

uint8_t scankey(uint8_t mode)

{

	static uint8_t press = 1;

	if(mode) press = 1;

	if(press||USER_KEY)

	{

		HAL_Delay(50);

		press = 0;

		if(USER_KEY) return(KEY_PRE);

	}

	else if(!USER_KEY)

	{

		press = 1;

	}

	return 0;

}

 printf("the init of uart success !!!\r\n");

	static uint16_t i;

	while(1)

	{

		if(scankey(0))

		{

			RED_TOG;

			i++;

			printf("i = %d\r\n",i);

			HAL_Delay(500);

		}

	}