www.pudn.com > cf_sector_RW.rar > cf_main.c
/*====================================================================
* 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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