cf_main.c

TI 5402 dsp芯片读写cf卡的源程序

/*====================================================================
* Code to perform CompactFlash Memory Card Operations
* Author:	Miguel Hernandez IV
* Filename:	cf_main.c
* Date:		07-29-01
*		11-04-01 Minor updates to prepare for publication.
**********************************************************************
* This is an example of how to access a Compact Flash Memory Card
* based on the application note titled, "Compact Flash Memory Card 
* Interface for the TMS320VC54x", TI Literature number SPRA803. 
**********************************************************************
* Files:    
*			cf_main.c
*			cf_routines.asm
*			cf_io_space.inc
*			cf_linker.cmd
*			rts.lib
*			cf_write_buffer.dat
**********************************************************************
* Note:	This is a simple example, and it should be modified to 
* 	handle specific system requirements.
**********************************************************************
====================================================================*/

/*====================================================================
	ATA Commands
====================================================================*/

extern unsigned short CReadSectors;
extern unsigned short CWriteSectors;
extern unsigned short CIdentifyDrive; 
ioport unsigned portb006;
ioport unsigned portb007;
ioport unsigned port9002;
ioport unsigned porta802;
ioport unsigned porta806;
/*====================================================================
	initial LBA value
====================================================================*/

extern unsigned long LBA;

/*====================================================================
	Function Prototypes
====================================================================*/

/*---- CompactFlash Status Checks ----*/

void CF_CheckReadyStatus();
void CF_CheckBusyStatus();
void CF_CheckDrqStatus();
void CF_CheckErrorStatus();

/*---- Reset ----*/

void CF_HardwareReset();

/*---- Initialize C54x ----*/

void DSP_Init();

/*---- Commands ----*/

void CF_IssueCommand(unsigned long PhysicalSector, 
                     unsigned short SectorCount, 
                     unsigned short Command);
void CF_IdentifyDrive();

/*---- CF Read/Write -----*/                      

void ReadCF(unsigned long PhysicalSector, 
            unsigned short SectorCount);
void WriteCF(unsigned long PhysicalSector, 
             unsigned short SectorCount);

/*---- CF Present ----*/

int CF_Present();

/*==================================================================*/

void main(void)
{
	 unsigned int aa;
	 int i;
     DSP_Init();			/* Initialize DSP */
    
for(i=0;i<255;i++)
 {
     porta802=i;
   //aa=port9002;
   //asm("   RSBX XF");
   //asm("   RPT #07FFFh");
   
   asm("   nop");
   asm("   nop");
   aa=porta802;
   asm("   nop");
   asm("   nop");
    // port8000=0xffff;
    asm("   nop");
    if(aa!=i)
    {
     asm("   nop");
    }
    //aa=port9002;
  // portb006=0x1111;
    
 //   port9002=0x34; 
    
  //  aa=port9002;
 //   port9002=0x22; 
    
    
 }
 
    LBA=0x000;
    if (CF_Present())
    { /*CF card detected so it's ok to run these functions*/
    CF_HardwareReset();		/* Reset CompactFlash */
		while(1)
		{
		
          
          WriteCF(LBA, 0);
          ReadCF(LBA, 0);		/* Read to CompactFlash */
          LBA+=256;
         
          }
          /********************************************************/
          /*Uncomment the statements below to try other functions.*/
          /*CF_IdentifyDrive();*/	/* Issue Identify Drive Command */
          /*WriteCF(LBA, 1);*/		/* Write to CompactFlash */
          /********************************************************/
     }
     else
    { /*No CF card detected. Power down system and re-insert card.*/
          while(1){} /*Spin here forever*/ 
    }
}
              

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