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(  );

 }