DSP中的键盘控制程序的算法，基于TI公司的5509这款DSP芯片

clude "scancode.h"

#define REGISTERCLKMD (*(unsigned int *)0x58)
ioport unsigned int port8000;
ioport unsigned int port8001;
ioport unsigned int port8002;
ioport unsigned int port8005;
ioport unsigned int port8007;

void Delay(unsigned int nTime);  // 延时子程序
void RefreshLEDArray();   // 刷新显示
void SetLEDArray(int nNumber);  // 修改显示内容
char ConvertScanToChar(unsigned char cScanCode); // 将键盘扫描码转换为字符

unsigned int nScreenBuffer[1024];
unsigned char ledbuf[8],ledx[8];
unsigned char ledkey[10][8]=
{
 {0x00,0x00,0x7C,0x82,0x82,0x82,0x7C,0x00},
 {0x00,0x00,0x00,0x84,0xFE,0x80,0x00,0x00}, //1
 {0x00,0x00,0x84,0xC2,0xA2,0x92,0x8C,0x00}, //2
 {0x00,0x00,0x44,0x92,0x92,0x92,0x6C,0x00},
 {0x00,0x00,0x30,0x28,0x24,0xFE,0x20,0x00},
 {0x00,0x00,0x4E,0x92,0x92,0x92,0x62,0x00},
 {0x00,0x00,0x7C,0x92,0x92,0x92,0x64,0x00},
 {0x00,0x00,0x02,0xC2,0x32,0x0A,0x06,0x00},
 {0x00,0x00,0x6C,0x92,0x92,0x92,0x6C,0x00},
 {0x00,0x00,0x4C,0x92,0x92,0x92,0x7C,0x00}
};
unsigned int uPort8000;

main()
{
 int nCount,nCursorCount;
 unsigned int nScanCode,nKeyCode;
 unsigned char cKey;

 REGISTERCLKMD=0;
 port8000=0;  // 初始化ICETEK-CTR
 port8000=0x80;
 port8000=0;
 port8007=0;   // 关闭东西方向的交通灯
 port8007=0x40; // 关闭南北方向的交通灯
 uPort8000=port8002;  // 清键盘缓冲区
 for ( nCount=0;nCount<8;nCount++ )
 {
  ledbuf[nCount]=0x0ff;  // 显示为空白
  ledx[nCount]=(nCount<<4); // 生成显示列控制字
 }
 RefreshLEDArray();
 nCount=nCursorCount=0;
 
 for (;;)
 {
  nScanCode=port8001;
  nScanCode&=0x0ff;
  uPort8000=port8002;
  if ( nScanCode!=0 && nScanCode!=0x0ff )
  {
   if ( nScanCode==SCANCODE_Enter ) break;
   else
   {
    cKey=ConvertScanToChar(nScanCode);
    if ( cKey!=0 )
    {
     nKeyCode=cKey-'0';
     SetLEDArray(nKeyCode);
    }
   }
  }
  Delay(16);
  nCursorCount++; nCursorCount%=4;
  if ( nCursorCount==0 ) ledbuf[7]^=0x80;
 }
 for ( nCount=0;nCount<8;nCount++ )
 {
  ledbuf[nCount]=0x0ff;  // 显示为空白
  ledx[nCount]=(nCount<<4); // 生成显示列控制字
 }
 RefreshLEDArray();
 exit(0);
}

void Delay(unsigned int nDelay)
{
 int ii,jj,kk=0;
 for ( ii=0;ii<nDelay;ii++ )
 {
  for ( jj=0;jj<64;jj++ )
  {
   RefreshLEDArray();
   kk++;
  }
 }
}

void RefreshLEDArray()
{
 int i;
 for ( i=0;i<8;i++ )
 {
  port8000=ledx[i];
  port8005=ledbuf[i];
 }
}

void SetLEDArray(int nNumber)
{
 int i;
 for ( i=0;i<8;i++ )
  ledbuf[i]=~ledkey[nNumber][7-i];
}

char ConvertScanToChar(unsigned char cScanCode)
{
 char cReturn;
 
 cReturn=0;
 switch ( cScanCode )
 {
  case SCANCODE_0: cReturn='0'; break;
  case SCANCODE_1: cReturn='1'; break;
  case SCANCODE_2: cReturn='2'; break;
  case SCANCODE_3: cReturn='3'; break;
  case SCANCODE_4: cReturn='4'; break;
  case SCANCODE_5: cReturn='5'; break;
  case SCANCODE_6: cReturn='6'; break;
  case SCANCODE_7: cReturn='7'; break;
  case SCANCODE_8: cReturn='8'; break;
  case SCANCODE_9: cReturn='9'; break;
 }
 
 return cReturn;
}