mcbsp2dattx.c

来自「CHP 2 - Real-Time Digital Signal Process」· C语言 代码 · 共 37 行

// 
//  Project: Experiment 2.10.6 Configure and Use McBSP- Chapter 2 
//  File name: mcbsp2DatTx.c   
//  Function(s): mcbsp2DatTx()        
//
//  Description: This function writes a data to McBSP2 DXR1 
//
//  For the book "Real Time Digital Signal Processing: 
//                Implementation and Application, 2nd Ed"
//                By Sen M. Kuo, Bob H. Lee, and Wenshun Tian
//                Publisher: John Wiley and Sons, Ltd
//
//  Tools used: CCS v.2.12.07
//              TMS320VC5510 DSK Rev-C
//

#include "mcbsp.h"

#pragma CODE_SECTION(mcbsp2DatTx,    ".text:example:mcbsp2DatTx");

short mcbsp2DatTx(short data)
{
  short retValue;
  ioport volatile unsigned short*p;      

  p = (ioport volatile unsigned short*)(McBSP_BASE+McBSP2_OFFSET);           
    
  retValue = 0;
  // Only write data if XRDY is set
  if ( (*(p+SPCR2) & XRDY_BIT) != 0) 
  {
    *(p+DXR1) = data;     // Write data to DXR for transmitting
    retValue = 1;         // Indicate the data has been written
  }
  return (retValue ); 
}