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Help to make driver of MX25L6445E

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kongfu1

Joined: 26 Apr 2010
Posts: 56

Help to make driver of MX25L6445E

Posted: Fri Jul 12, 2013 8:38 pm

Hi,

Somehow a driver of MX25L6445E is not working. Please help.

CCS 4.144
PIC24EP512GU810

Code:

#define TRANS_LENGTH 16
#define RANDOM_SEED 106
#define FLASH_TARGET_ADDR 0x00000000

uint32 FlashID = 0xc2201700;
uint8 ElectronicID = 0x16;

void SendFlashAddr( uint32 flash_address)
{
spi_write( flash_address >> 24 ); // A31-A0
spi_write( flash_address >> 16 );
spi_write( flash_address >> 8 );
spi_write( flash_address );
}

//enable write bit
ReturnMsg CMD_WREN( void )
{
// Chip select go low to start a flash command
output_low(FLS_MEM_CS);

// Write Enable command = 0x06, Setting Write Enable Latch Bit
spi_write( FLASH_CMD_WREN );

// Chip select go high to end a flash command
output_high(FLS_MEM_CS);

return FlashOperationSuccess;
}

//page program
ReturnMsg CMD_PP( uint32 flash_address, uint8 *source_address, uint32 byte_length )
{
uint32 index;
uint8 addr_4byte_mode;

// Check flash is busy or not
if( IsFlashBusy() ) return FlashIsBusy;

// Check 3-byte or 4-byte mode
addr_4byte_mode = TRUE; // 4-byte mode

// Setting Write Enable Latch bit
CMD_WREN();

// Chip select go low to start a flash command
output_low(FLS_MEM_CS);

// Write Page Program command
spi_write( FLASH_CMD_PP );
SendFlashAddr( flash_address );

// Set a loop to down load whole page data into flash's buffer
// Note: only last 256 byte will be programmed
for( index=0; index < byte_length; index++ )
{
spi_write( *(source_address + index) );
}

// Chip select go high to end a flash command
output_high(FLS_MEM_CS);

if( WaitFlashReady( 2000 ) )
return FlashOperationSuccess;
else
return FlashTimeOut;
}

//erase flash
ReturnMsg CMD_SE( uint32 flash_address )
{
uint8 addr_4byte_mode;

// Check flash is busy or not
if( IsFlashBusy() ) return FlashIsBusy;

addr_4byte_mode = TRUE; // 4-byte mode

// Setting Write Enable Latch bit
CMD_WREN();

// Chip select go low to start a flash command
output_low(FLS_MEM_CS);

//Write Sector Erase command = 0x20;
spi_write( FLASH_CMD_SE );
SendFlashAddr( flash_address );

// Chip select go high to end a flash command
output_high(FLS_MEM_CS);

if( WaitFlashReady( 5000 ) )
return FlashOperationSuccess;
else
return FlashTimeOut;
}

//read Status Register Bits.
ReturnMsg CMD_RDSR( uint8 *StatusReg )
{
uint8 gDataBuffer;

// Chip select go low to start a flash command
output_low(FLS_MEM_CS);

// Send command
spi_write( FLASH_CMD_RDSR );
gDataBuffer = spi_read( 0 );

// Chip select go high to end a flash command
output_high(FLS_MEM_CS);

*StatusReg = gDataBuffer;

return FlashOperationSuccess;
}

//read flash
ReturnMsg CMD_READ( uint32 flash_address, uint8 *target_address, uint32 byte_length )
{
uint32 index;

// Chip select go low to start a flash command
output_low(FLS_MEM_CS);

// Write READ command and address
spi_write( FLASH_CMD_READ );
SendFlashAddr( flash_address );

// Set a loop to read data into buffer
for( index=0; index < byte_length; index++ )
{
// Read data one byte at a time
*(target_address + index) = spi_read( 0 );
}

// Chip select go high to end a flash command
output_high(FLS_MEM_CS);

return FlashOperationSuccess;
}

//read mfg id
ReturnMsg CMD_RDID( uint32 *Identification )
{
uint32 temp;
uint8 gDataBuffer[3];

// Chip select go low to start a flash command
output_low(FLS_MEM_CS);

// Send command
spi_write( FLASH_CMD_RDID);

// Get manufacturer identification, device identification
gDataBuffer[0] = spi_read( 0 );
gDataBuffer[1] = spi_read( 0 );
gDataBuffer[2] = spi_read( 0 );

// Chip select go high to end a command
output_high(FLS_MEM_CS);

// Store identification
temp = gDataBuffer[0];
temp = (temp << 8) | gDataBuffer[1];
*Identification = (temp << 8) | gDataBuffer[2];

return FlashOperationSuccess;
}
//read electronic ID
ReturnMsg CMD_RES( uint8 *ElectricIdentification )
{

// Chip select go low to start a flash command
output_low(FLS_MEM_CS);

// Send flash command and insert dummy cycle
spi_write( FLASH_CMD_RES);
//Insert Dummy Cycle - 24 bits
spi_read(0);
spi_read(0);
spi_read(0);

// Get electric identification
*ElectricIdentification = spi_read(0);

// Chip select go high to end a flash command
output_high(FLS_MEM_CS);

return FlashOperationSuccess;
}

BOOL IsFlashBusy( void )
{
uint8 gDataBuffer;

CMD_RDSR( &gDataBuffer );
if( (gDataBuffer & FLASH_WIP_MASK) == FLASH_WIP_MASK )
return TRUE;
else
return FALSE;
}

BOOL WaitFlashReady( uint32 ExpectTime )
{

uint32 temp = 0;
while( IsFlashBusy() )
{
if( temp > ExpectTime )
{
return FALSE;
}
temp = temp + 1;
delay_ms(1);
}
return TRUE;

}

uint8 FlashID_Test( void )
{
uint32 flash_id = 0;
uint16 error_cnt = 0;
uint16 rems_id;
uint8 electric_id = 0;
FlashStatus flash_state = {0};
ReturnMsg msg;

/* Read flash device id */
msg = CMD_RDID( &flash_id );
if( msg != (ReturnMsg)FlashOperationSuccess )
return FALSE;

msg = CMD_RES( &electric_id );
if( msg != (ReturnMsg)FlashOperationSuccess )
return FALSE;

/* Compare to expected value */
if( flash_id != FlashID )
return FALSE;

if( electric_id != ElectronicID )
return FALSE;

return TRUE;
}

uint8 FlashReadWrite_Test( void )
{
ReturnMsg message= 0;
FlashStatus flash_state = {0};

uint32 flash_addr;
uint32 trans_len = 0;
uint16 i=0, error_cnt = 0;
uint16 seed = 0;
uint8 st_reg = 0;
uint8 memory_addr[TRANS_LENGTH] = {0};
uint8 memory_addr_cmp[TRANS_LENGTH] = {0};

/* Assign initial condition */
flash_addr = FLASH_TARGET_ADDR;
trans_len = TRANS_LENGTH;
seed = RANDOM_SEED;

/* Prepare data to transfer */
srand( seed );
for( i=0; i< trans_len; i=i+1 ){
memory_addr[i] = rand()%256; // generate random byte data
}

/* Erase 4K sector of flash memory
Note: It needs to erase dirty sector before program */
CMD_SE( flash_addr );

/* Program data to flash memory */
CMD_PP( flash_addr, memory_addr, trans_len );

/* Read flash memory data to memory buffer */
CMD_READ( flash_addr, memory_addr_cmp, trans_len );

/* Compare original data and flash data */
for( i=0; i < (trans_len); i=i+1 )
{
if( memory_addr[i] != memory_addr_cmp[i] )
error_cnt++;
}

/* Erase 4K sector of flash memory */
CMD_SE( flash_addr );

if( error_cnt != 0 )
return FALSE;
else
return TRUE;

}

void initFSHMem(void)
{
uint8 theRet;
BOOL theBool;
output_high(FLS_MEM_CS);
output_high(FLS_MEM_CS);
setup_spi(SPI_MASTER | SPI_H_TO_L | SPI_CLK_DIV_512);

theBool = WaitFlashReady( 1000 );
if(theBool)
theRet = FlashReadWrite_Test();
//theRet = FlashID_Test();
}

Thanks.

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Fri Jul 12, 2013 9:43 pm

Quote:

Somehow a driver of MX25L6445E is not working. Please help.

Check your code. For SPI applications, the first thing to check is your
setup_spi() statement:

Quote:

setup_spi(SPI_MASTER | SPI_H_TO_L | SPI_CLK_DIV_512);

Here are the #define statements for the SPI modes:

Code:

#define SPI_MODE_0 (SPI_L_TO_H | SPI_XMIT_L_TO_H)
#define SPI_MODE_1 (SPI_L_TO_H)
#define SPI_MODE_2 (SPI_H_TO_L)
#define SPI_MODE_3 (SPI_H_TO_L | SPI_XMIT_L_TO_H)

Now you should look in the MX25L6445E data sheet, at the following
figure, and see what SPI modes it supports:

Quote:

Figure 1-1. Serial Modes Supported (for Normal Serial mode)

Compare that to the mode in your setup_spi() statement.

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