【从零开始做示波器第一步：搞定DSP之AD数据采集，采用DMA通道】

shixiaoling312

【从零开始做示波器第一步：搞定DSP之AD数据采集，采用DMA通道】 [复制链接]

调程序看文档，一直搞到晚上八点，终于把DMA传输方式采集AD数据的源码给搞定了。唉，真是大大考验了我的英文水平呐，说白了也就一两个寄存器没配置好的事儿。看到数组里面变化的数字们，感觉初代示波器已经离我不远了，嘻嘻。

核心代码：见附件
额，今天才发现，传的代码被公司电脑给加密了，以后直接贴上来得了，虽然有点长。。。


#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File

// ADC start parameters
#if (CPU_FRQ_150MHZ)     // Default - 150 MHz SYSCLKOUT
  #define ADC_MODCLK 0x3 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3)   = 25.0 MHz
#endif
#if (CPU_FRQ_100MHZ)
  #define ADC_MODCLK 0x2 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 100/(2*2)   = 25.0 MHz
#endif
#define ADC_CKPS   0x0   // ADC module clock = HSPCLK/1      = 25.5MHz/(1)   = 25.0 MHz
#define ADC_SHCLK  0x1   // S/H width in ADC module periods                  = 2 ADC cycle

#define BUF_SIZE   1024  // Sample buffer size


#pragma DATA_SECTION(DMABuf1,"DMARAML4");
volatile Uint16 DMABuf1[BUF_SIZE];

volatile Uint16 *DMADest;
volatile Uint16 *DMASource;
interrupt void local_DINTCH1_ISR(void);



void main(void)
{
   Uint16 i;
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2833x_SysCtrl.c file.
   InitSysCtrl();

// Specific clock setting for this example:
   EALLOW;
   SysCtrlRegs.HISPCP.all = ADC_MODCLK;        // HSPCLK = SYSCLKOUT/ADC_MODCLK
   EDIS;

// Step 2. Initialize GPIO:
// This example function is found in the DSP2833x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio();  // Skipped for this example

// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
   DINT;

// Initialize the PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the DSP2833x_PieCtrl.c file.
   InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:
   IER = 0x0000;
   IFR = 0x0000;

// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in DSP2833x_DefaultIsr.c.
// This function is found in DSP2833x_PieVect.c.
   InitPieVectTable();


// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
   EALLOW;        // Allow access to EALLOW protected registers
   PieVectTable.DINTCH1= &local_DINTCH1_ISR;
   EDIS;   // Disable access to EALLOW protected registers

   IER = M_INT7 ;                                     //Enable INT7 (7.1 DMA Ch1)
   EnableInterrupts();
// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2833x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
   InitAdc();  // For this example, init the ADC

// Specific ADC setup for this example:
   AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;  // Sequential mode: Sample rate   = 1/[(2+ACQ_PS)*ADC clock in ns]
                        //                     = 1/(3*40ns) =8.3MHz (for 150 MHz SYSCLKOUT)
                                            //                     = 1/(3*80ns) =4.17MHz (for 100 MHz SYSCLKOUT)
                                            // If Simultaneous mode enabled: Sample rate = 1/[(3+ACQ_PS)*ADC clock in ns]
   AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
   AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;        // 1  Cascaded mode
   AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0;
   AdcRegs.ADCTRL1.bit.CONT_RUN = 1;       // Setup continuous run
   AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1;  // Enable SEQ1 interrupt (every EOS)
   AdcRegs.ADCTRL2.bit.RST_SEQ1 = 0x1;

   AdcRegs.ADCTRL1.bit.SEQ_OVRD =1;       // Enable Sequencer override feature
   AdcRegs.ADCCHSELSEQ1.all = 0x0;         // Initialize all ADC channel selects to A0
   AdcRegs.ADCCHSELSEQ2.all = 0x0;
   AdcRegs.ADCCHSELSEQ3.all = 0x0;
   AdcRegs.ADCCHSELSEQ4.all = 0x0;
   AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0xf;  // convert and store in 8 results registers


//Step 5. User specific code, enable interrupts:
  // Initialize DMA
        DMAInitialize();

        // Clear Table
   for (i=0; i    {
     DMABuf1 = 0;
   }

       
// Configure DMA Channel
    DMADest   = &DMABuf1[0];              //Point DMA destination to the beginning of the array
        DMASource = &AdcMirror.ADCRESULT0;    //Point DMA source to ADC result register base
        DMACH1AddrConfig(DMADest,DMASource);
        DMACH1BurstConfig(15,1,1);
        DMACH1TransferConfig(63,-15,0);
        DMACH1WrapConfig(66,0,66,16);
        DMACH1ModeConfig(DMA_SEQ1INT,PERINT_ENABLE,ONESHOT_DISABLE,CONT_ENABLE,SYNC_DISABLE,SYNC_SRC,
                         OVRFLOW_DISABLE,SIXTEEN_BIT,CHINT_END,CHINT_ENABLE);





        StartDMACH1();



   // Start SEQ1
  AdcRegs.ADCTRL2.bit.SOC_SEQ1 = 0x1;
   for(;;)
   {
   /*for(i=0;i<10;i++){
            for(j=0;j<1000;j++){}
        AdcRegs.ADCTRL2.bit.SOC_SEQ1 = 1;    //Normally ADC will be tied to ePWM, or timed routine
   }                                             //For this example will re-start manually*/
   /*for(i=0;i<1024;i++)
           {
                 while (AdcRegs.ADCST.bit.INT_SEQ1== 0) {} // Wait for interrupt
                 AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;
              DMABuf1 =((AdcRegs.ADCRESULT0>>4) );
           }*/
   }
}

// INT7.1
interrupt void local_DINTCH1_ISR(void)     // DMA Channel 1
{

  // To receive more interrupts from this PIE group, acknowledge this interrupt
   PieCtrlRegs.PIEACK.all = PIEACK_GROUP7;

  // Next two lines for debug only to halt the processor here
  // Remove after inserting ISR Code
   asm ("      ESTOP0");
//  for(;;);
}

逆风飞翔

学习了，顶一下。  之前也用DSP做过示波器，只不过A/D用的是TI的ADS831，没用DSP内部AD，因为DSP内部A/D没调试成功，惭愧呀！

kyky11

不错