dsPIC33EP256MC506用于扫描模拟输入的ADC和DMA配置

我目前使用的是DSIC33 EP256MC506，其中我配置了8个IO作为模拟输入。我有（我想我已经）配置ADC来扫描8个模拟输入和DMA来将ADC数据分流到RAM中的一个缓冲区（大小9）。我通常希望把每个模拟输入的数据放在缓冲器的每个元素中，然后在DMA产生中断时读取缓冲器。然而，DMA似乎只把数据放在前两个元素中。由MPLAB代码配置器和DMA中断服务例程生成。当我读取IAN0变量时，只有ANAN0和IAN1有数据。在这方面的任何帮助都将非常感谢。谢谢。



      以下为原文

    I am currently using the dsPIC33EP256MC506 where I have configured 8 IO as analog input. I have (I think i have) configured the ADC to scan the 8 analog inputs and the DMA to shunt the ADC data to a buffer (of size 9) in the RAM. I would generally like to have the data from each analog input placed in each element of the buffer and then read the buffer when the DMA generates an interrupt.
However, the DMA seems to be placing the data only in the first two elements.
Attached is the code for the configuration of the ADC and DMA generated by the MPLAB Code configurator and the DMA interrupt service routine.


unsigned int BufferA[10];
extern unsigned int inAN0 = 0, inAN1 = 0, inAN3 = 0, inAN5 = 0, inAN8 = 0, inAN9 = 0, inAN10 = 0, inAN11 = 0, inAN12 = 0;


typedef struct
{
uint8_t intSample;
}

ADC_OBJECT;

static ADC_OBJECT adc1_obj;

/**
  Section: Driver Interface
*/


void ADC1_Initialize (void)
{
    // ASAM enabled; ADDMABM enabled; ADSIDL disabled; DONE disabled; SIMSAM Sequential; FORM Absolute decimal result, unsigned, right-justified; SAMP enabled; SSRC Internal Counter ends sampling and starts conversion; AD12B 12-bit; ADON enabled; SSRCG disabled;

   AD1CON1 = 0x94E6;

    // CSCNA enabled; VCFG0 VREF-; VCFG1 VREF+; ALTS disabled; BUFM disabled; SMPI 1; CHPS 1 Channel;

   AD1CON2 = 0x6400;

    // SAMC 2; ADRC FOSC/2; ADCS 255;

   AD1CON3 = 0x2FF;
   
   //ADDAEN enabled, DMABL allocates 2 words of buffer to each input
   
   AD1CON4 = 0x101;

    // CH0SA AN0; CH0SB AN0; CH0NB AVSS; CH0NA AVSS;
   
   AD1CHS0 = 0x0;

    // CSS26 disabled; CSS25 disabled; CSS24 disabled; CSS31 disabled; CSS30 disabled;

   AD1CSSH = 0x0;

    // CSS9 disabled; CSS8 enabled; CSS7 enabled; CSS6 enabled; CSS5 disabled; CSS4 disabled; CSS3 enabled; CSS2 enabled; CSS15 disabled; CSS1 enabled; CSS14 disabled; CSS0 enabled; CSS13 disabled; CSS12 disabled; CSS11 enabled; CSS10 enabled;

   AD1CSSL = 0xDCF;

    // CH123SA disabled; CH123SB CH1=OA2/AN0,CH2=AN1,CH3=AN2; CH123NA disabled; CH123NB CH1=VREF-,CH2=VREF-,CH3=VREF-;

   AD1CHS123 = 0x0;


   adc1_obj.intSample = AD1CON2bits.SMPI;
   
}



void ADC1_Tasks ( void )
{
    // clear the ADC interrupt flag
    IFS0bits.AD1IF = false;
}



void DMA_Initialize(void)
{
    // Initialize channels which are enabled
    // AMODE Peripheral Indirect Addressing mode; CHEN enabled; SIZE 16 bit; DIR Reads from peripheral address, writes to RAM address; NULLW disabled; HALF Initiates interrupt when all of the data has been moved; MODE Continuous, Ping-Pong modes are disabled;
    DMA1CON= 0x20; //Enable DMA Channel later;
    // FORCE disabled; IRQSEL ADC1;
    DMA1REQ= 0xD;
    DMA1REQbits.IRQSEL = 13;
    // STA 0;
    DMA1STAH= 0x0000;
   
    DMA1STAL= __builtin_dmaoffset(BufferA);
   
    //DMA1STAL= &BufferA[0];
   
    DMA1PAD = (int) &ADC1BUF0; //Point DMA0 to ADC1BUF0
    DMA1CNT = 9;
    // Clearing Channel 1 Interrupt Flag;
    IFS0bits.DMA1IF = false;
    // Enabling Channel 1 Interrupt
    IPC3bits.DMA1IP = 1; // Set interrupt priority
    IEC0bits.DMA1IE = 1;

    //Enable DMA Channel 1
    }
void __attribute__ ( ( interrupt, no_auto_psv ) ) _DMA1Interrupt( void )
{
inAN0 = BufferA[0];
inAN1 = BufferA[1];
inAN3 = BufferA[2];
inAN5 = BufferA[3];
inAN8 = BufferA[4];
inAN9 = BufferA[5];
inAN10 = BufferA[6];
inAN11 = BufferA[7];
inAN12 = BufferA[8];
IFS0bits.DMA1IF = 0;
}




When I read the inAN0 variables only inAN0 and inAN1 have data.

Any help in this regards will be much appreciated.

Thanks in advance.