Hiii ,
I am using AT45DB041E flash which are available on FRDM-KW41Z evaluation borad ,
Interfacing of AT45DB041E using SPI communication , using this Read Manufacturer ID and Device ID successfully , but for read data it always read FF or 00
unsigned char RdFlashByte(unsigned int BuffAddr)
{
unsigned char rddata = 0 ;
unsigned char t1[5]={0};
PRINTF("\nRdFlashByte\r\n");
while(!FlashReadBusy()); //wait if device is busy
t1[0] = BUFFER_1_READ; //or 0xD1
t1[1] = 0x00;
t1[2] = ((unsigned char)(BuffAddr>>8));
t1[3] = ((unsigned char)(BuffAddr));
t1[4] = 0x00;
isTransferCompleted = false ;
dspi_transfer_t masterXfer;
masterXfer.txData = &t1[0] ;
masterXfer.rxData = NULL ;
masterXfer.dataSize = 5 ;
masterXfer.configFlags = kDSPI_MasterCtar1 | EXAMPLE_DSPI_MASTER_PCS_FOR_TRANSFER | kDSPI_MasterPcsContinuous;
DSPI_MasterTransferNonBlocking(EXAMPLE_DSPI_MASTER_BASEADDR, &g_m_handle, &masterXfer);
/* Wait transfer complete */
while (!isTransferCompleted)
{
}
/* Delay to wait slave is ready */
for (i = 0; i < EXAMPLE_DSPI_DEALY_COUNT; i++)
{
__NOP();
}
isTransferCompleted = false ;
masterXfer.txData = NULL ;
masterXfer.rxData = &rddata ;
masterXfer.dataSize = 1 ;
masterXfer.configFlags = kDSPI_MasterCtar1 | EXAMPLE_DSPI_MASTER_PCS_FOR_TRANSFER | kDSPI_MasterActiveAfterTransfer;
DSPI_MasterTransferNonBlocking(EXAMPLE_DSPI_MASTER_BASEADDR, &g_m_handle, &masterXfer);
/* Wait transfer complete */
while (!isTransferCompleted)
{
}
/* Delay to wait slave is ready */
for (i = 0; i < EXAMPLE_DSPI_DEALY_COUNT; i++)
{
__NOP();
}
PRINTF("\n Rx data :%d \r\n,",rddata);
return rddata;
} //End of RdFlashByte Function
please give some idea.
