TM4C129ENCPDT: SPI

Hi All

In my code, I am able to read the device ID from SPI flash but unable to do read  operations. . And when I write a dummy data A B C D and try to read it I am getting all 0xFFs only. Please have a look into my code and help me.

Thanks in Advance.

Im using spi configuration in it rtos

void SPI_CONFIG(void)
{
SPI_Params_init(&spiParams);
spiParams.transferMode = SPI_MODE_BLOCKING;
spiParams.transferTimeout = SPI_WAIT_FOREVER;
spiParams.transferCallbackFxn = NULL;
spiParams.mode = SPI_MASTER;
spiParams.bitRate = 1000000;
spiParams.dataSize = 8;
spiParams.frameFormat = SPI_POL1_PHA1;

spiHandle = SPI_open(Board_SPI0,&spiParams);
if(spiHandle == NULL)
{
// printf("unable to open spi2...!");
}
}

// Function to make flash memory Write Enable

void flashWriteEnable(void)
{
controlCSPin(true); // Set CS pin low to enable the device
// Enable Write Enable
transmitBuffer[0] = 0x06; // Write Enable command
SPI_Transaction spiTransaction;
spiTransaction.count = 1;
spiTransaction.txBuf = transmitBuffer;
spiTransaction.rxBuf = NULL;

if (SPI_transfer(spiHandle, &spiTransaction))
{
// printf("Write Enable successful....!");
}
else
{
// printf("Write Enable error occurred.......!");
return;
}
controlCSPin(false); // Set CS pin high to disable the device
}

// Function to Erase Sector of flash memory
void flashSectorErase(uint32_t address)
{
controlCSPin(true); // Set CS pin low to enable the device
// Erase Sector
SPI_Transaction spiTransaction;
// spiTransaction.count = length + 4;
// spiTransaction.count = length;
spiTransaction.txBuf = transmitBuffer1;
spiTransaction.rxBuf = receiveBuffer1;

transmitBuffer[0] = 0x20; // Sector Erase command
transmitBuffer[1] = (address >> 16) & 0xFF; // Address byte 2
transmitBuffer[2] = (address >> 8) & 0xFF; // Address byte 1
transmitBuffer[3] = address & 0xFF; // Address byte 0
spiTransaction.count = 4;

if (SPI_transfer(spiHandle, &spiTransaction))
{
// printf("Sector Erase successful.....!");
}
else
{
// printf("Sector Erase error occurred.....!");
return;
}
}

// Function to write data to W25Q flash memory
void flashWrite(uint32_t address, uint8_t *data, uint32_t length)
{
flashWriteEnable();
flashSectorErase(address);
// Read the status register of the W25Q32 flash memory
uint8_t statusRegister = readStatusRegister();

SPI_Transaction spiTransaction;
// spiTransaction.count = length + 4;
spiTransaction.count = length;
spiTransaction.txBuf = transmitBuffer1;
spiTransaction.rxBuf = receiveBuffer1;

// Wait for erase operation to complete (can use status register polling)
if((statusRegister & 0x02)) //((statusRegister & 0x01) == 0) busy
{
// Page Program
controlCSPin(true); // Set CS pin low to enable the device
transmitBuffer[0] = 0x02; // Page Program command
transmitBuffer[1] = (address >> 16) & 0xFF; // Address byte 2
transmitBuffer[2] = (address >> 8) & 0xFF; // Address byte 1
transmitBuffer[3] = address & 0xFF; // Address byte 0

memcpy(&transmitBuffer[4], data, length);
spiTransaction.count = length + 4;

if (SPI_transfer(spiHandle, &spiTransaction))
{
// printf("Page Program successful.....!");
}
else
{
// printf("Page Program error occurred.....!");
return;
}

controlCSPin(false); // Set CS pin high to disable the device
}

}

// Function to read data from W25Q flash memory
void flashRead(uint32_t address, uint8_t *data, uint32_t length)
{
controlCSPin(true); // Set CS pin low to enable the device
transmitBuffer1[0] = 0x03; // Read command
transmitBuffer1[1] = (address >> 16) & 0xFF; // Address byte 2
transmitBuffer1[2] = (address >> 8) & 0xFF; // Address byte 1
transmitBuffer1[3] = address & 0xFF; // Address byte 0

SPI_Transaction spiTransaction;
spiTransaction.count = length + 4;
// spiTransaction.count = length;
spiTransaction.txBuf = transmitBuffer1;
spiTransaction.rxBuf = receiveBuffer1;

if (SPI_transfer(spiHandle, &spiTransaction))
{
memcpy(data, &receiveBuffer1[4], length);
// printf("Read successful.......!");
}
else
{
// printf("Read error occurred......!");
}
controlCSPin(false); // Set CS pin high to disable the device
}