/*
** This function will send the Write Enable command to the Flash device.
*/
static void WriteEnable(void)
{
unsigned int dummy = 0;
unsigned short length = 0;
txBuffer[0] = FLASH_WRITE_ENABLE;
length = 1;
/* Configure the write enable parameters for Edma transfer.*/
McSpiTxEdmaParamSet(MCSPI_TX_EVENT, MCSPI_TX_EVENT, txBuffer,
length);
/* Configure the write enable parameters for Edma receive.*/
McSpiRxEdmaParamSet(MCSPI_RX_EVENT, MCSPI_RX_EVENT, (unsigned char *)dummy,
length, FALSE);
/* Register the call-back function for Tx/Rx events of McSPI.*/
cb_Fxn[MCSPI_TX_EVENT] = &CallBack;
cb_Fxn[MCSPI_RX_EVENT] = &CallBack;
McSPITransfer(length);
/* Check whether write enable command is properly latched on to flash */
IsWriteEnabled();
}
static void WriteEnable(void)
{
unsigned int buffLength = 1;
volatile char writeEn;
volatile char dummy;
writeEn = SPI_FLASH_WRITE_EN;
/* Configure the PaRAM registers in EDMA for Transmission. */
SpiTxEdmaParamSet(EDMA3_CHA_SPI1_TX, EDMA3_CHA_SPI1_TX, &writeEn, buffLength);
/* Registering Callback Function for Transmission. */
cb_Fxn[EDMA3_CHA_SPI1_TX] = &callback;
/* Configure the PaRAM registers in EDMA for Reception. */
SpiRxEdmaParamSet(EDMA3_CHA_SPI1_RX, EDMA3_CHA_SPI1_RX, &dummy, buffLength, FALSE);
/* Registering Callback Function for Reception. */
cb_Fxn[EDMA3_CHA_SPI1_RX] = &callback;
/* Assert the CSHOLD line corresponding to the SPI Flash. */
CSHoldAssert();
/* Enable SPI controller to generate DMA events */
SPIIntEnable(SOC_SPI_1_REGS, SPI_DMA_REQUEST_ENA_INT);
/* Wait until both the flags are set to 1 in the callback function. */
while((0 == flagTx) || (0 == flagRx));
flagTx = 0;
flagRx = 0;
/* Deassert the CSHOLD line corresponding to the SPI Flash. */
CSHoldDeassert();
/* Wait until SPI Flash is enabled for writing. */
while (IsWriteEnabled() != TRUE);
}
