[PIC] dsPIC33EP ADC with DMA configuration

Status
Not open for further replies.

14779

Newbie level 1
Joined
Dec 9, 2014
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Visit site
Activity points
13
Hi all,

I am struggling to get the ADC with DMA working on the dsPIC33EP256MC506. I think the issue is in the declaration of the pointer and the size of the buffers. I have looked at the example codes for this but all of the example codes use eds and I believe this controller does not have eds. Any help would be hugely appreciated ( ) as I have been going round in circles with this for a few weeks now.

The initialization of the ADC and DMA is

Code C - [expand]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
void Initialise_AD(void)
{
    unsigned int adcBuf[15][1];
    AD1CON1=0x0068;                                                           
    AD1CON2=0x0300;                                                            
    AD1CON3=0x0003;                                                            
    AD1CON4=0x0100;                                                            
    AD1CHS123=0x0000;                                                           
    AD1CHS0=0x000A;                                                             
    AD1CSSL=0x0000;                                                             
    AD1CSSH=0x0000;
    IFS0bits.AD1IF = 0;                                                         
    IEC0bits.AD1IE = 0;                                                         
    AD1CON1bits.ADON = 1;
 
        // DMA1 configuration
    DMA1CON=0x0020;
    DMA1CNT =3;                                                                
    DMA1PAD=(unsigned int) &ADC1BUF0;                                          
    DMA1REQ=0x000D;                                                            
    DMA1STAL = __builtin_dmaoffset(adcBuf);                                     
    DMA1STAH=0x0000;                                                            
    DMA1CONbits.CHEN=1;                                                        
    IFS0bits.DMA1IF = 0;                                                       
    IEC0bits.DMA1IE = 1;       
}




The interrupt handler is

Code C - [expand]
1
2
3
4
5
6
7
8
9
10
11
void __attribute__((interrupt,no_auto_psv)) _DMA1Interrupt(void)
{
 
    _DMA1IF=0;
    IFS5bits.PWM1IF=0;
    _SAMP=1;
    data1=adcBuf[10][1];
    data2=adcBuf[0][1];
    data3=adcBuf[1][1];
    data4=adcBuf[2][1];    
}



I am expecting to see the data from AN10, AN0, AN1 and AN2 on data1, data2, data3, and data4 respectively.

Many thanks
 

Status
Not open for further replies.

Similar threads

Cookies are required to use this site. You must accept them to continue using the site. Learn more…