Omega Engineering OME-A826PG 사용자 설명서

OME-A-826PG Software Manual [Win 95/98/NT] 

 

z

  Description: 

This subroutine will allocate a DMA buffer in the system area, and 

programming the gain code and sampling rate. then starting the DMA transfer for 
a specific A/D channel.  
 

z

  Syntax: 

WORD A826_AD_DMA_Start(WORD Ch, WORD Gain, WORD c1, Word c2, 

int Count, WORD wPassOut[ ] ) 

 

z

  Parameter: 

Ch  : 

[

Input

] the A/D channel.  

Gain   : 

[

Input

] the Gain code 

c1,c2  

 

: [

Input

] the DMA sampling rate is 2M/(c1*c2) 

Count  

: 

[

Input

] the desired A/D entries count for DMA transfer. 

wPassOut[] : 

[

Output

] the debug information. 

  wPassOut[0] : [

Output

]         0: successful in starting DMA transfer. 

    

   

     others: fail in starting DMA transfer. 

  wPassOut[1] : [

Output

] system DMA buffer ID. 

  wPassOut[2] : [

Output

] the I/O port base address. 

  wPassOut[3] : [

Output

] the IRQ level for DMA. 

  wPassOut[4] : [

Output

] the DMA channel no. 

  wPassOut[5] : [

Output

] reserved. 

  wPassOut[6] : [

Output

] reserved. 

  wPassOut[7] : [

Output

] reserved. 

  wPassOut[8] : [

Output

] the last 16 bits of physical address  

    

   

     for DMA buffer in system area. 

  wPassOut[9] : [

Output

] the first 16 bits of physical address  

    

   

     for DMA buffer in system area. 

 

z

  Return Value: 

NoError   

 

: successful   

       DmaStartError   

: failure 

 

Date: Aug-15-2000             Ver: 2.2                                                                                         Page  50