//************************************************************

//標題:4乘4鍵盤的輸入函數
//  函數描述:   char gotkey(void)
//             從4*4小鍵盤輸入數據,返回0~9,及其它數據.
//***********************************************************
//時間遲延函數
//*********************************************************
void delay (void)     
{
  unsigned char i,j;
  for(i=0;i<5;i++)
    for(j=0;j<255;j++);
}
//*************************************************
//檢查是否有按鍵按下
//*************************************************
char keypad_scan()   
{
  char key,i;
  p2=0xF0;
  while(p2!=0XF0);
    do{
        for(i=0;i<=3;i++)
         {  p2=ksp;
           if(p2!=ksp)
           {
             delay();
             key=p2;
             if(key!=ksp)
             {
               return(key);
             }
           }
         }
       }while(1);
}
//***************************************
//取得鍵值
//***************************************
char gotkey()
{
  char temp,i;
  temp=keypad_scan();
  for(i=0;i<=15;i++)
   {
     if(temp==key_code)
      return(i);
   }
}




//**************************************
//93c66驅動程序
//**************************************
//********************************************

unsigned char read_byte(int address)
{int i, command;
unsigned char temp;
CS=1;
command=(READ|address);
write_command(command);
for(i=0;i<8;i++)
  {SK=1;
   SK=0;
   temp=(temp<<1);
   if(DO==1)
     temp=(temp|0X01);
  }
CS=0;
return(temp);
}

//**********************************************

void write_enable()
{int command;
CS=1;
command=EWEN;
write_command(command);
CS=0;
}

//***********************************************

void write_disable()
{int command;
CS=1;
command=EWDS
write_command(command);
CS=0;
}

//************************************************

void write_byte(int address,unsigned char write_date)
{int i,command;
write_enable();
CS=1;
command=(WRITE|address);
write_command(command);
for(i=0;i<8;i++)
  {if(write_date&0X80)}
     DI=1;
   elae
     DI=0;
   SK=1;
   SK=0;
   write_date=(write_data<<1);
  }
check_busy();
write_disable();
}

//*************************************************

void write_command(int command)
{int i;
command=(command<<shiftbit);
for(i=0;i<12;i++)
  {if(command&0X8000)
    DI=1;
   else
    DI=0;
   SK=1;
   SK=0;
   command=(command<<1);
  }
}

//***********************************************

void check_busy(void)
{CS=0;
CS=1;
while(DO==0);
}



//******************************************
//標題：ISD4004驅動法程序
//功能：語音選段播放
//******************************************
void delay(unsigned int time) //延遲n微秒
{
while(time!=0)
{
time-- ;
}
}
void delayms(unsigned int time) //延遲n毫秒
{ TMOD=0x01;

for(time;time>0;time--)
{
TH0=0xfc;
TL0=0x18;
TR0=1;
while(TF0!=1)
{;}
TF0=0;
TR0=0;
}

}

//************************************
//ISD4004 spi串行發送子程序，16位數據
//************************************
void spi_send(unsigned char isdx)
{ unsigned char isx_counter;
SS=0; //ss=0,打開spi通信端
SCLK=0;
for(isx_counter=0;isx_counter<8;isx_counter++) 
//先發低位再發高位，依次發送。
{ if ((isdx&0x01)==1)
MOSI=1;
else
MOSI=0;
isdx=isdx>>1;
SCLK=1;
delay(2);

SCLK=0;
delay(2);
}
}

//*******************************
//發送stop指令
//*******************************
void isd_stop(void)
{ delay(10);
spi_send(0x30);
SS=1;
delayms(50);
}
//*******************************
//發送上電指令，并延遲50ms
//*******************************
void isd_pu(void)
{ delay(10);
SS=0;
spi_send(0x20);
SS=1;
delayms(50);
}
//*******************************
//發送掉電指令，并延遲50ms
//*******************************

void isd_pd(void)
{ delay(10);

spi_send(0x10);
SS=1;
delayms(50);
}


//*******************************
//發送分段語音setplay指令
//*******************************
void isd_setplay(unsigned char adl,unsigned char adh)
{
isd_pd();
delayms(1);
spi_send(adl); 
delay(2);
spi_send(adh); 
delay(2);
spi_send(0xe0); 
SS=1;
spi_send(0xf0);
SS=1;
if(ISD_INT==0)
isd_stop();
isd_pd(); 
}