#include  "msp430x44x.h " 
//-------------------------------------------------------------
//MSP-Test44x Demo   ROW matrix key ,LCD dispaly the key value
//
//                          MSP430F449             
//                       -----------------
//                   /|\|              XIN|-  
//                    | |                 |            key
//         LCD        --|RST          XOUT|-       
//        ----------    |                 |       |             | 
//       |     COM0|<---|COM0         P1.0|------>|1  2  3  *   |
//       |       . |  . |  .            . |   .   |4  5  6  0   |
//       |     COM3|<---|COM3           . |   .   |7  8  9  #   |    
//       |      S0 |<---|S0             . |   .   |             | 
//       |       . |  . |             P1.7|------>|             |
//       |      S14|<---|S14              |
//
//  Yang Rui
//  Lierda, Inc
//  February 2004
//  Built with IAR Embedded Workbench Version: 1.26B
//---------------------------------------------------------
//-----flag byte define------
//---------------------------------------------------------
#define     key_press       0x2
//---------------------------------------------------------
//-----vaule define----------
//---------------------------------------------------------
static  unsigned char flag;                       //flag register
static  unsigned char key_buff;                   //key vaule buffer
static  unsigned char sec;                        //second buffer
static  unsigned char min;                        //minuter buffer
static  unsigned char hour;                       //hour buffer
const   unsigned char lcd_table[12]={
0x7b,       //*"0"*//
0x12,       //*"1"*//
0x4f,       //*"2"*//
0x1f,       //*"3"*//                             //lcd display table
0x36,       //*"4"*//
0x3d,       //*"5"*//
0x7d,       //*"6"*//
0x13,       //*"7"*//
0x7f,       //*"8"*//
0x3f,       //*"9"*//
0x6d,       //*"e"*//
0x65,       //*"f"*//
};
const   unsigned char key_table[12]={
0x0b,       //*(key_vaule)          00(key_num)
0x09,       //9                     01 
0x08,       //8                     02
0x07,       //7                     03
0x00,       //0                     04
0x06,       //6                     05            //key vaule table
0x05,       //5                     06
0x04,       //4                     07  
0x0a,       //#                     08
0x03,       //3                     09
0x02,       //2                     0a  
0x01,       //1                     0b
};
void rtc(void);
void display_rtc(void);
void display_dec(int i,int j);
void lcd_display (void);
void scan_key_deal(void);

//--------------------------------------------------
//-----------main PROGRAM-----------------------------
//--------------------------------------------------
void main(void)
{  
    int i;
    WDTCTL = WDTPW + WDTHOLD;
    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();
//*mainloop*//
    for(;;)
    {
       _BIS_SR(LPM3_bits);                //in LPM3
       _NOP();
               
    }
}   
    

// Basic Timer interrupt service routine
interrupt[BASICTIMER_VECTOR] void basic_timer(void)
{
    rtc();                                //RTC modulate
    scan_key_deal();                      //scan the queue key
    if(flag)                              //if key press,show the key value
    {
    flag=flag<0x6f?flag+1:0;
    lcd_display();
    }
    else    
    display_rtc();                        //not ,display the rtc
} 
//--------------------------------------------------------
//---------RTC PROGRAM------------------------------------
//--------------------------------------------------------
void  rtc (void)
{ 
  if (++sec < 240)
    return;
  sec = 0;
  if (++min < 60)
    return;
  min = 0;
  if (++hour < 24)
    return;
  hour = 0; 
} 
//---------------------------------------------------------
//---------RTC DISPLAY PROGRAM-----------------------------
//---------------------------------------------------------
void display_rtc(void)
{ int i;
  i=sec;
  i=i>>2;
  display_dec(0,i);
  i=min;
  display_dec(2,i);
  i=hour;
  display_dec(4,i); 
  LCDMEM[6]=0x00;  
}
//---------------------------------------------------------
//-------- RTC LCD DISPLAY PROGRAM-------------------------
//---------------------------------------------------------
void display_dec(int i,int j)
{
 LCDMEM[i]=lcd_table[j%10]+0x80;
 LCDMEM[i+1]=lcd_table[j/10];
}
//---------------------------------------------------------
//-------- KEY DISPLAY PROGRAM-----------------------------
//---------------------------------------------------------
void lcd_display (void)
{
int i;
for (i=0;i<7;i++)
LCDMEM[i]=lcd_table[key_buff&0x0f];
}
//---------------------------------------------------------
//------- SCAN KEY PROGRAM---------------------------------
//---------------------------------------------------------
void scan_key_deal(void)
{
unsigned char counter;
unsigned char buffer;
unsigned char com_byte;
unsigned char key_num;
P1DIR=0x0f;
com_byte=0xff;
P1OUT&=~0x08;
P1OUT&=~0x04;
P1OUT&=~0x02;
buffer=P1IN;                  
if(0xf0!=(buffer&0xf0))                    //judge if the key was press
    {
    P1OUT|=0x08;
    P1OUT|=0x04;
    P1OUT|=0x02;
    com_byte=0xff;
    key_num=0x00;
    com_byte=0x02;  
    for(counter=0x03;counter>0;counter--)  //get the key num
        {
        P1OUT&=~com_byte;                  //scan the row
        if(!(P1IN&BIT4))
        break;
        key_num++;
        if(!(P1IN&BIT5))
        break;
        key_num++;
        if(!(P1IN&BIT6))
        break;
        key_num++;
        if(!(P1IN&BIT7))
        break;
        key_num++;
        com_byte=com_byte<<1;        
        }
     flag|=key_press;
     buffer=P1IN;
     buffer=P1IN;
     key_buff=key_table[key_num];         //get the key value     
     return;       
     }   
//     flag&=~key_press;           
}