serial_comm_1.c

单片机像计算机发送、接收数据、串口中断、蓝牙通讯

/**********************************************
*   File: Serial_Comm_1.C
*   Description: Serial Communication Example 1
*   Created Date:  2007-10-01
*   Last Modified: 2007-10-01
*   Author: Jeffrey - [e-mail]
*   Notes: None
**********************************************/
#include "Atmel/AT89X51.h"

unsigned char Read_Keyboard();
void RS232_SendData(unsigned char Sdata);

/**********************************************
*   Function: delay(unsigned int t)
*   Input Variables: t
*   Return Variables: None
*   Usage: Common Delay Routine, t as the delay time ticks
**********************************************/
void delay(unsigned int t)
{
		for(;t>0;t--);		// 延时循环
}

/**********************************************
*   Function: RS232_Init(void)
*   Input Variables: none
*   Return Variables: None
*   Usage: Init UART
**********************************************/
void RS232_Init()
{
	SCON = 	0x50;		// UART工作于模式1， REN=1 
	TMOD = 	0x20 ;		// Timer1 工业于模式2
	PCON |= 0x80;		// SMOD1 = 1 
	TH1	= 0xF3;			// 波特率9600 Bds at 24MHz 
	TL1	= 0xF3;			// 波特率9600 Bds at 24MHz 
	TR1 = 1; 			// 启动Timer1 
}

/**********************************************
*   Function: main()
*   Input Variables: None
*   Return Variables: None
*   Usage: Program Entry
*********************************************/
void main()
{
		unsigned char Keyboard_Status = 0xff;		// 定义键值
		while(1)
		{
				Keyboard_Status = Read_Keyboard();	// 读取按键值
				//********************主程序部分*********************//
				switch(Keyboard_Status)
				{
					case (~0x01):
					{
						RS232_SendData('A');
						break;					
					}
					case (~0x02):
					{
						RS232_SendData('B');
						break;					
					}
					case (~0x04):
					{
						RS232_SendData('C');
						break;					
					}
					case (~0x08):
					{
						RS232_SendData('D');
						break;					
					}
					case (~0x10):
					{
						RS232_SendData('E');
						break;					
					}
					case (~0x20): 
					{
						RS232_SendData('F');
						break;					
					}
					case (~0x40): 
					{
						RS232_SendData('G');
						break;
					}
					case (~0x80): 
					{
						RS232_SendData('H');
						break;
					}
					default:
					RS232_SendData('X');
					break;
				}
				//********************主程序部分*********************//
		}
}

/**********************************************
*   Function: RS232_SendData(unsigned char Sdata)
*   Input Variables: unsigned char Sdata
*   Return Variables: none
*   Usage: Send a Char to UART
*********************************************/
void RS232_SendData(unsigned char Sdata)
{
	SBUF = Sdata;		// 发送数据
	while(TI==0);		// 等待发送完毕
	TI = 0;			    // 清除发送结束标志
}

/**********************************************
*   Function: Read_Keyboard
*   Input Variables: None
*   Return Variables: Keys Value
*   Usage: Read Keyboard Status
*********************************************/
unsigned char Read_Keyboard()
{
		unsigned char Keys_Value;				// 定义键值变量
		unsigned char Keys_Temp;
		
		do
		{
			P2 = 0xff;							// P2口置高，准备读取按键状态
			Keys_Temp = P2;						// 读取按键状态
			delay(150);							// 消抖延时
			P2 = 0xff;							// P2口置高，准备读取按键状态
			Keys_Value = P2;					// 读取按键状态
		}
		while(Keys_Value != Keys_Temp);			// 如果读取状态不一致，则重复读取键值
		return Keys_Value;						// 返回按键状态值
}