x5045.c

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//------------------------------------------------------------------------------------
// x5045.c
//------------------------------------------------------------------------------------
//
//------------------------------------------------------------------------------------
// Includes
//------------------------------------------------------------------------------------
#include <reg52.h>
#include "cpu/cpu.h"
#include "misc/general.h"
//------------------------------------------------------------------------------------
// x5045 Constants
//------------------------------------------------------------------------------------
#define x5045_WREN			0x06   				 // enable write operations
#define x5045_RDSR			0x05   				 // read status register
#define x5045_WRDI     	    0x04                 // disable write operations
#define x5045_READ			0x03   				 // read
#define x5045_WRITE		    0x02   				 // write
#define x5045_WDSR	  		0x01   				 // write status register
#define x5045_A8       	    0x03                 // address A8 bit
#define x5045_BUSY     	    0x01                 // Write-In-Progress bit mask
#define x5045_tWAIT     	6*0xFF               // wait out of Write-In-Progress
#define BUSY                1
#define IDLE                0
//------------------------------------------------------------------------------------
// Function PROTOTYPES
//------------------------------------------------------------------------------------
char x5045_Read_Status  (void);
void x5045_Write_Enable (void);
void x5045_Write_Status (void);
void x5045_Wait_Busy    (void);
bit  x5045_Is_Busy      (void);
void x5045_Write        ( char addr, char* buf, char n );
void x5045_Read         ( char addr, char* buf, char n );
//------------------------------------------------------------------------------------
// x5045 read status register routine
//------------------------------------------------------------------------------------
char x5045_Read_Status (void)
{
	char stat = 0;

	spi_Start;
	spi_Write_Byte ( x5045_RDSR );
	stat = spi_Read_Byte ();
	spi_Stop;
    return stat;
}
//------------------------------------------------------------------------------------
// x5045 write enable routine
//------------------------------------------------------------------------------------
void x5045_Write_Enable (void)
{
	spi_Start;
	spi_Write_Byte ( x5045_WREN );
	spi_Stop;
}
//------------------------------------------------------------------------------------
// x5045 write status register routine
//------------------------------------------------------------------------------------
void x5045_Write_Status (void)
{
	spi_Start;
	spi_Write_Byte ( x5045_WREN );
	spi_Write_Byte ( x5045_WDSR );
	spi_Write_Byte ( 0 );
	spi_Stop;
    x5045_Wait_Busy ();
}
//------------------------------------------------------------------------------------
// x5045 Wait Out Of Busy Routine
//------------------------------------------------------------------------------------
void x5045_Wait_Busy (void)
{
	int t = x5045_tWAIT;

	while ( t-- )
	{		
		Delay ( 0x00000020 );
		if (( x5045_BUSY & x5045_Read_Status ()) == IDLE ) break;
	}
}
//------------------------------------------------------------------------------------
// x5045 Poll Busy Routine
//------------------------------------------------------------------------------------
bit x5045_Is_Busy (void)
{
	if ( x5045_BUSY & x5045_Read_Status ()) return BUSY;
	return IDLE;
}
//------------------------------------------------------------------------------------
// x5045 read routine
//------------------------------------------------------------------------------------
void x5045_Read ( char addr, char* buf, char n )
{
	spi_Start;
	spi_Write_Byte ( x5045_READ | ((MSBYTE(addr) & 0x01) << x5045_A8));
	spi_Write_Byte ( LSBYTE(addr) );
	while ( n-- ) *buf++ = spi_Read_Byte ();
	spi_Stop;
}
//------------------------------------------------------------------------------------
// x5045 write routine
//------------------------------------------------------------------------------------
void x5045_Write ( char addr, char* buf, char n )
{
	spi_Start;
	spi_Write_Byte ( x5045_WRITE | ((MSBYTE(addr) & 0x01) << x5045_A8 ));
	spi_Write_Byte ( LSBYTE( addr ));
	while ( n-- ) spi_Write_Byte ( *buf++ );
	spi_Stop;
    x5045_Wait_Busy ();
}