//使用F330,串口為P0.4,P0.5;操作方法：插上短路環J11，拔掉J12，連上USB線。
//-----------------------------------------------------------------------------
// UART.c
//-----------------------------------------------------------------------------


//-----------------------------------------------------------------------------
// 所包含的頭文件
//------------------------------------------------------------------------

#include <c8051f330.h>                 
#include <stdio.h>

//-----------------------------------------------------------------------------
// 常量定義
//-----------------------------------------------------------------------------

#define SYSCLK          24500000             // 系統工作頻率
#define BAUDRATE        9600               // 串口工作波特率
#define TIMER2_RATE     1000                 // 定時器2溢出標志位頻率
 
//-----------------------------------------------------------------------------
// F33x’定時器2的16位SFR
//-----------------------------------------------------------------------------

sfr16 TMR2RL   = 0xca;                 
sfr16 TMR2     = 0xcc;                 

//-----------------------------------------------------------------------------

// 功能函數
//-----------------------------------------------------------------------------

void SYSCLK_Init (void);
void PORT_Init (void);
void UART0_Init (void);
void Timer2_Init (int);
bit ReceiveBit;
unsigned char temp;
void delay(unsigned int m)
{
unsigned int n;
n=0;
while(n<m)
{n++;}
return;
}
//-----------------------------------------------------------------------------
// 主程序
//-----------------------------------------------------------------------------

 void main (void) {


   PCA0MD &= ~0x40;                    // 禁止看門狗
                                       
   PORT_Init();                        // 初始化端口I/O
   
   SYSCLK_Init ();                     //  初始化系統時鐘
   
   Timer2_Init(SYSCLK/TIMER2_RATE);    //  初始化 Timer 2 
   
   UART0_Init();                       //  串口初始化
  EA=1;
  ES0=1;
  while(1)
  {
  while(ReceiveBit==1)
  {
  ES0=0;
  EA=0;
  ReceiveBit=0;
  delay(60000);
 delay(60000);
 delay(60000);
 SBUF0=temp;
 while(TI0==0);
 TI0=0;
delay(60000);
 delay(60000);
 delay(60000);
 ES0=1;
 EA=1;
  }
  }
  //printf (" KEN :) Happy new year!  \n ");                //  輸出字符     
 
}

  

//-----------------------------------------------------------------------------
// 端口初始化
//-----------------------------------------------------------------------------
//
// Configure the Crossbar and GPIO ports.
//
// P0.4 - UART TX
// P0.5 - UART RX
// P3.3 - LED

void PORT_Init (void)
{
   //P0SKIP  |= 0x01;                    
  // P0MDIN  |= 0x01;                    // 配置P0.0為模擬出入
   P0MDOUT |= 0x10;                    // 使能 UTX 為推挽輸出
 //  P1MDOUT |= 0x08;                    // 使能 LED 為推挽輸出
   XBR0    = 0x01;                     // 使能 UART on P0.4(TX) and P0.5
                     
   XBR1    = 0x40;                  
}
//-----------------------------------------------------------------------------
// 系統時鐘初始化
//-----------------------------------------------------------------------------


void SYSCLK_Init (void)
{
   OSCICN |= 0x03;                     // 配置內部振蕩器的的最大頻率
                                        
   RSTSRC  = 0x04;                     // 使能始終丟失檢測寄存器

}

//-----------------------------------------------------------------------------
// 串口初始化
//-----------------------------------------------------------------------------


void UART0_Init (void)
{
   SCON0 = 0x10;                       
   if (SYSCLK/BAUDRATE/2/256 < 1) {

      TH1 = -(SYSCLK/BAUDRATE/2);
      CKCON &= ~0x0B;                  
      CKCON |=  0x08;
   } else if (SYSCLK/BAUDRATE/2/256 < 4) {
      TH1 = -(SYSCLK/BAUDRATE/2/4);
      CKCON &= ~0x0B;                                    
      CKCON |=  0x09;
   } else if (SYSCLK/BAUDRATE/2/256 < 12) {
      TH1 = -(SYSCLK/BAUDRATE/2/12);
      CKCON &= ~0x0B;                  
   } else {
      TH1 = -(SYSCLK/BAUDRATE/2/48);
      CKCON &= ~0x0B;                   
      CKCON |=  0x02;
   }

   TL1 = TH1;                          
   TMOD &= ~0xf0;                      
   TMOD |=  0x20;                       
   TR1 = 1;                            
  // TI0 = 1;                            
}
//-----------------------------------------------------------------------------
// 時鐘2中斷
//-----------------------------------------------------------------------------

void Timer2_Init (int counts)
{
   TMR2CN = 0x00;                      // 停止時鐘2;清除 TF2H 和TF2L;
                                       
   CKCON |= 0x10;                      
   TMR2RL  = -counts;                  
   TMR2    = TMR2RL;                   
   ET2 = 0;                            
   TR2 = 1;                            
}
void UATR0_ISR(void)  interrupt 4
{
if(!TI0)
{
RI0=0;
temp=SBUF0;
ReceiveBit=1;
}
TI0=0;
}