[求助] 关于dma的ad采集

了无痕迹01 2015-8-21 15:52 楼主

使用epwm触发adc转换后开启DMA传输，因为我只采集A0的数据，所以一次传输就传1个数据，再等epwm信号，来一个epwm信号就传输一次，共传输1024个数据后进DMA中断，也就是说epwm是采样频率。。。。但是结果发现数据是都正确，但是调试的时候没有进中断。。。。哪位大神能解答一下，，，谢谢了
#include "DSP2833x_Device.h"    // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h" // DSP2833x Examples Include File
#define ADC_SHCLK  0xf // S/H width in ADC module periods
#define ADC_CKPS 0x1 // ADC module clock = HSPCLK/1
// Prototype statements for functions found within this file.
interrupt void local_DINTCH1_ISR(void);
#pragma DATA_SECTION(DMABuf1,"DMARAML4");

// Global variables used in this example:
volatile Uint16 *DMADest;
volatile Uint16 *DMASource;
volatile Uint16 DMABuf1[1024];
Uint16 flag=0;
main()
{

Uint16 i=0;
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2833x_SysCtrl.c file.
InitSysCtrl();

EALLOW;
#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

SysCtrlRegs.HISPCP.all = ADC_MODCLK;// HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz
EDIS;

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();
// Clear Table
  for (i=0; i<1024; i++)
{
   DMABuf1[i] = 1;
}
// Disable CPU interrupts and clear all CPU interrupt flags:
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW;  // This is needed to write to EALLOW protected register
PieVectTable.DINTCH1= &local_DINTCH1_ISR;
EDIS; // This is needed to disable write to EALLOW protected registers

IER = M_INT7 ;                            //Enable INT7 (7.1 DMA Ch1)
EnableInterrupts();

//  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

// Configure ADC
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;  //采样窗设置，尽量大点
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS; //分频
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;       //级联模式 1  Cascaded mode
AdcRegs.ADCMAXCONV.all = 0x0000;       // 通道数为1个 Setup 1 conv's on SEQ1
AdcRegs.ADCTRL2.bit.RST_SEQ1 = 0x1;    //初始化SEQ1
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0; // 设置ADCINA0为第一采集通道 Setup ADCINA0 as 1st SEQ1 conv.
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;  // 允许epwm为触发SEQ1       Enable SOCA from ePWM to start SEQ1
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; //允许INT_SEQ1向CPU发出中断申请    Enable SEQ1 interrupt (every EOS)

// Configure ePWM1 设置1k的采样频率

EPwm1Regs.ETSEL.bit.SOCAEN = 1;       // Enable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = 2;    // 当TBCTR=TBPRD时产生epwm1soca信号
EPwm1Regs.ETPS.bit.SOCAPRD = 1;       //在第一个事件时，产生SOC信号 Generate pulse on 1st event

EPwm1Regs.TBCTR=0;                   //对时基计数器清0
EPwm1Regs.TBPRD = 0x61A7;             // Set period for ePWM1
EPwm1Regs.TBCTL.bit.HSPCLKDIV=3;    //TBCLK=25Mhz
EPwm1Regs.TBCTL.bit.CTRMODE = 0;    // count up and start

// Initialize DMA
DMAInitialize();
// 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(0,0,1);
DMACH1TransferConfig(1023,0,1);
DMACH1WrapConfig(0,0,0xFFFF,0);
DMACH1ModeConfig(DMA_SEQ1INT,PERINT_ENABLE,ONESHOT_DISABLE,CONT_ENABLE,SYNC_DISABLE,SYNC_SRC,
               OVRFLOW_DISABLE,SIXTEEN_BIT,CHINT_END,CHINT_ENABLE);

StartDMACH1();

for(;;)
{

}

}

interrupt void  local_DINTCH1_ISR(void)
{
// Acknowledge this interrupt to receive more interrupts from group 7
PieCtrlRegs.PIEACK.all = PIEACK_GROUP7;
  //  asm ("    ESTOP0");
flag++;
}