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uint8_t Key_GetNum(void) {
    uint8_t keyNum = 0;
   /*
       在Key_init()中
       设置所有行为高电平，列为输入下拉模式（IPD）
       GPIO_SetBits(GPIOB, Key_ROW1 | Key_ROW2 | Key_ROW3 | Key_ROW4);
       GPIO_ResetBits(GPIOA, Key_Pin_A_All);
       GPIO_ResetBits(GPIOC, Key_Pin_C_All);
	*/
	GPIO_SetBits(GPIOB, Key_ROW4);
	GPIO_ResetBits(GPIOB, Key_ROW1);
	if (GPIO_ReadInputDataBit(GPIOA, Key_COL1) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOA, Key_COL1) == Bit_RESET);
		keyNum = 1;
	} else if (GPIO_ReadInputDataBit(GPIOA, Key_COL2) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOA, Key_COL2) == Bit_RESET);
		keyNum = 5;
	} else if (GPIO_ReadInputDataBit(GPIOC, Key_COL3) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOC, Key_COL3) == Bit_RESET);
		keyNum = 9;
	} else if (GPIO_ReadInputDataBit(GPIOC, Key_COL4) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOC, Key_COL4) == Bit_RESET);
		keyNum = 13;
	}
	// 等待一段时间，避免检测到多个按键同时按下
	Delay_ms(10);
    	GPIO_SetBits(GPIOB, Key_ROW1);
	GPIO_ResetBits(GPIOB, Key_ROW2);
	if (GPIO_ReadInputDataBit(GPIOA, Key_COL1) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOA, Key_COL1) == Bit_RESET);
		keyNum = 2;
	} else if (GPIO_ReadInputDataBit(GPIOA, Key_COL2) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOA, Key_COL2) == Bit_RESET);
		keyNum = 6;
	} else if (GPIO_ReadInputDataBit(GPIOC, Key_COL3) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOC, Key_COL3) == Bit_RESET);
		keyNum = 10;
	} else if (GPIO_ReadInputDataBit(GPIOC, Key_COL4) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOC, Key_COL4) == Bit_RESET);
		keyNum = 14;
	}
	Delay_ms(10);
    	GPIO_SetBits(GPIOB, Key_ROW2);
	GPIO_ResetBits(GPIOB, Key_ROW3);
	if (GPIO_ReadInputDataBit(GPIOA, Key_COL1) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOA, Key_COL1) == Bit_RESET);
		keyNum = 3;
	} else if (GPIO_ReadInputDataBit(GPIOA, Key_COL2) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOA, Key_COL2) == Bit_RESET);
		keyNum = 7;
	} else if (GPIO_ReadInputDataBit(GPIOC, Key_COL3) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOC, Key_COL3) == Bit_RESET);
		keyNum = 11;	
	} else if (GPIO_ReadInputDataBit(GPIOC, Key_COL4) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOC, Key_COL4) == Bit_RESET);
		keyNum = 15;
	}
	Delay_ms(10);
    	GPIO_SetBits(GPIOB, Key_ROW3);
	GPIO_ResetBits(GPIOB, Key_ROW4);
	if (GPIO_ReadInputDataBit(GPIOA, Key_COL1) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOA, Key_COL1) == Bit_RESET);
		keyNum = 4;
	} else if (GPIO_ReadInputDataBit(GPIOA, Key_COL2) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOA, Key_COL2) == Bit_RESET);
		keyNum = 8;
	} else if (GPIO_ReadInputDataBit(GPIOC, Key_COL3) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOC, Key_COL3) == Bit_RESET);
		keyNum = 12;
	} else if (GPIO_ReadInputDataBit(GPIOC, Key_COL4) == Bit_RESET && keyNum == 0) {Delay_ms(10);
		while(GPIO_ReadInputDataBit(GPIOC, Key_COL4) == Bit_RESET);
		keyNum = 16;
	}
    Delay_ms(10);
    	return keyNum;
}