//******************************************************************************
//MSP430-TEST44X Demo   Timer_B worked at capture mode ,LCD display the key value
//
//	Description;P1.1 connect P3.6;  P1.2 connect P3.5;  P1.3 connect P3.4;
//	Timer_B worked at the capture mode ,when the key put down,bring a negl .
//	Timer_B capture the signal and intrrupt to get the key value.LCD dispaly 
//	the key vaule.There are have eight key weave.
//      only key_1;only key_2,only key_3;put key_1>5s;put key_3>5s;first key_2,
//	then key_3;first key_3 then key_2;    
//
// 
//           msp430f449
//         ---------------
//        |          P3.4 |<----KEY_1(INC)
//        |          P3.5 |<----KEY_2(DEC)
//        |          P3.6 |<----KEY_3(FUN)
//        |               |
//        |               |
//  Yang Rui
//  Lierda, Inc
//  MAY 2004
//  Built with IAR Embedded Workbench Version: 1.26B
//*******************************************************************************
#include <msp430x44x.h>
unsigned int  key_count=0x00;
unsigned char key_value=0xff;
unsigned char kinput=0x00;
unsigned char ktemp=0x00;
unsigned char kstore=0x00;
unsigned char kready=0x00;
unsigned char koutput=0x00;
unsigned char getkey=0x00;
unsigned char key_flag=0x00;
const unsigned kconst=0x70;
#define ten_ms     0x028e;
#define key_1_5s   0x1f;
#define key_error  0xee;
#define key_3_5s   0x3f;
#define key_2_3    0x23;
#define key_3_2    0x32; 
const   unsigned char lcd_table[16]={
0x7B,  /* "0" */
0x12,  /* "1" */
0x4F,  /* "2" */
0x1F,  /* "3" */                              //0-F display table
0x36,  /* "4" */
0x3D,  /* "5" */
0x7D,  /* "6" */
0x13,  /* "7" */
0x7F,  /* "8" */
0x3F,  /* "9" */
0x77,  /* "A" */
0x7C,  /* "B" */
0x69,  /* "c" */
0x5E,  /* "D" */
0x6D,  /* "E" */
0x65,  /* "F" */
};
void main(void)
{   int i;
     WDTCTL = WDTPW + WDTHOLD;
    TBCTL = TBSSEL0+TBCLR;            
    TBCCTL3 = CM_2+SCS+CAP+CCIE+CCIS_1;          //下降沿捕获，CCI3B 为信号源
    TBCCTL4 = CM_2+SCS+CAP+CCIE+CCIS_1;          //下降沿捕获，CCI4B 为信号源
    TBCCTL5 = CM_2+SCS+CAP+CCIE+CCIS_1;          //下降沿捕获，CCI5B 为信号源
    P3SEL |= BIT4+BIT5+BIT6;
    BTCTL=BTSSEL+BT_ADLY_250+BTFRFQ1;     //BT 0.25 S interrupt
    IE2|=BTIE;
    P5SEL=0xfc;                           //enable lcd display
    LCDCTL=LCDON+LCD4MUX+LCDP2;
    for (i=0; i<8; ++i)                   // clear lcd 
    LCDMEM[i] = 0x00;    
     _EINT();                                 //允许中断
//*mainloop*//
    for(;;)
    {
       _BIS_SR(LPM3_bits);                   //进入低功耗模式3
       _NOP();
    }
}
#if __VER__ < 200
interrupt[TIMERB1_VECTOR] void Timer_B1(void)
#else
#pragma vector=TIMERB1_VECTOR
__interrupt void Timer_B1 (void)
#endif
{   
switch (TBIV)
 {
    case 6: goto key;
    case 8:goto key;
    case 10:goto key;
key:
    if (TBCTL&MC_1)
    {
      kinput= ~P3IN;
      kready = ktemp & kinput | kready &(ktemp ^ kinput);
      ktemp = kinput;
      koutput = kready & ( ~kstore | kconst);
      kstore = kready;  
      if (koutput!=0)
      key_count++;   
      if (koutput==0x10)
      getkey=0x10;                        
         else if (koutput==0x20)
         getkey=0x20;
             else if (koutput==0x40)
             getkey=0x40; 
                                               
     }                          
    else
    {

     TBCTL |= MC_1+TBIE;                             
     TBCCTL3 = CCIE;
     TBCCR3 = ten_ms;
     TBCCR0 = TBCCR3;  
     break; 
    }
    switch (koutput)
    {
    case 0x00: goto key_00;
    case 0x10: goto key_10;
//    case 0x20: goto key_20;
    case 0x30: goto key_30;
    case 0x40: goto key_40;
    case 0x50: goto key_50;
    case 0x60: goto key_60;
key_00:
if((P3IN&0x70)!=0x70)
  break;
  else if(getkey==0x10)
     key_value=0x10;
        else if((getkey==0x20)&(key_flag==0))
            key_value=0x20;
                else if((getkey==0x40)&(key_flag==0))
                    key_value=0x40;
  goto tb_init;      
key_10:
  if(key_count>250)
    { key_value=key_1_5s;
     goto tb_init;}
  break;
key_30:
  key_value=0x30;
  goto tb_init;
key_40:
  if(key_count>250)
    { key_value=key_3_5s;
     goto tb_init;}
  break;
key_50:
  key_value=key_error;
  goto tb_init;
key_60:
    key_flag++;
    if(getkey==0x20)
    {key_value=key_2_3; 
    break;}    
    else if(getkey==0x40)  
    {key_value=key_3_2;
    break;}
    
tb_init:
    TBCTL = TBSSEL_1+TBCLR;            
    TBCCTL3 = CM_2+SCS+CAP+CCIE+CCIS_1;          //下降沿捕获，CCI3B 为信号源
    TBCCTL4 = CM_2+SCS+CAP+CCIE+CCIS_1;          //下降沿捕获，CCI4B 为信号源
    TBCCTL5 = CM_2+SCS+CAP+CCIE+CCIS_1;          //下降沿捕获，CCI5B 为信号源
    key_count=00;
    kinput=00;
    ktemp=00;
    kstore=00;
    kready=00;
    koutput=00;
    getkey=00;
    key_flag=00;
    }
   break; 
  } 
}
  
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     

#pragma vector=BASICTIMER_VECTOR
__interrupt void basic_timer(void)
{
 LCDMEM[1]=lcd_table[key_value&0x0f];
 LCDMEM[2]=lcd_table[key_value>>4];
}