DSP5509的ADC实验

1. 本次使用esay5509开发板，具体做这个板子叫做大道科技。

2. 5509有2个ADC的输入引脚，就是2个采集通道

3. 看下ADC的寄存器

4. 看下代码中怎么引用ADC的寄存器的，这种写法很少用，但是在DSP中很常见的。

 ioport unsigned int *ADCCTL1=(unsigned int *)0x6800;
 ioport unsigned int *ADCDATA1=(unsigned int *)0x6801;
 ioport unsigned int *ADCCLKDIV1=(unsigned int *)0x6802;
 ioport unsigned int *ADCCLKCTL1=(unsigned int *)0x6803;
 #define ADCCTL (*ADCCTL1)
 #define ADCDATA (*ADCDATA1)
 #define ADCCLKDIV (*ADCCLKDIV1)
 #define ADCCLKCTL (*ADCCLKCTL1) 

5. 主程序比较简单

 main()
 {
     int i;
     unsigned int uWork;

     EnableAPLL();

     InitADC();
     PLL_Init();
     while (  )
     {
         for ( i=;i<;i++ )
         {
             ADCCTL=0x8000;    // 启动AD转换，通道0
             do
             {
                 uWork=ADCDATA;
             } while ( uWork&0x8000 );
             nADC0[i]=uWork&0x0fff;
         }
         for ( i=;i<;i++ )
         {
             ADCCTL=0x9000;    // 启动AD转换，通道1
             do
             {
                 uWork=ADCDATA;
             } while ( uWork&0x8000 );
             nADC1[i]=uWork&0x0fff;
         }
         asm( " nop");        // break point 在这里设断点
     }
 }

 void InitADC()
 {
     ADCCLKCTL=0x23; // 4MHz ADCLK
     ADCCLKDIV=0x4f00;
 }

6. 在程序中注意到一个细节，怎么直接给寄存器赋值的，看下面*( ioport volatile unsigned short* )0x1f00 = 4;这种写法很重要，一定要掌握。

 void EnableAPLL( )
 {
     /* Enusre DPLL is running */
     *( ioport volatile unsigned short* )0x1f00 = ;
     wait(  );
     *( ioport volatile unsigned short* )0x1f00 = ;
     // MULITPLY
     *( ioport volatile unsigned short* )0x1f00 = 0x3000;
     // COUNT
     *( ioport volatile unsigned short* )0x1f00 |= 0x4F8;
     wait(  );
     //*( ioport volatile unsigned short* )0x1f00 |= 0x800
     // MODE
     *( ioport volatile unsigned short* )0x1f00 |= ;
     wait(  );
     // APLL Select
     *( ioport volatile unsigned short* )0x1e80 = ;
     // DELAY
     wait(  );
 }