int32_t DRV_SPI_MasterRMReceive8BitISR( struct DRV_SPI_DRIVER_OBJECT * pDrvInstance )
{
register SPI_MODULE_ID spiId = pDrvInstance->spiId;
register DRV_SPI_JOB_OBJECT * currentJob = pDrvInstance->currentJob;
if (currentJob == NULL)
{
return 0;
}
if (PLIB_SPI_ReceiverBufferIsFull(spiId))
{
/* We have data waiting in the SPI buffer */
if (currentJob->dataLeftToRx != 0)
{
/* Receive the data and updates the count */
currentJob->rxBuffer[currentJob->dataRxed] = PLIB_SPI_BufferRead(spiId);
currentJob->dataRxed++;
currentJob->dataLeftToRx --;
}
else
{
/* No Data but dummy data: Note: We cannot just clear the
buffer because we have to keep track of how many symbols/units we
have received, and the number may have increased since we checked
how full the buffer is.*/
PLIB_SPI_BufferRead(spiId);
//SYS_CONSOLE_MESSAGE("Rd ");
currentJob->dummyLeftToRx--;
}
/* No longer have a symbol in progress */
pDrvInstance->symbolsInProgress = 0;
}
return 0;
}
/************************************************************************
* Function: void SST25ReadArray(DWORD address, BYTE* pData, nCount)
*
* Overview: this function reads data into buffer specified
*
* Input: flash memory address, pointer to the data buffer, data number
*
************************************************************************/
void SST25ReadArray(uint32_t address, uint8_t *pData, uint16_t nCount)
{
SST25CSLow();
SPIPut(spiInitData.spiId, SST25_CMD_READ);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, address>>16);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, address>>8);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, address);
PLIB_SPI_BufferRead(spiInitData.spiId);
while(nCount--)
{
SPIPut(spiInitData.spiId, 0);
*pData++ = PLIB_SPI_BufferRead(spiInitData.spiId);
}
SST25CSHigh();
}
/************************************************************************
* Function: void SST25SectorErase(DWORD address)
*
* Overview: this function erases a 4Kb sector
*
* Input: address within sector to be erased
*
* Output: none
*
************************************************************************/
void SST25SectorErase(uint32_t address)
{
SST25WriteEnable();
// while(!SPILock(spiInitData.spiId));
SST25CSLow();
SPIPut(spiInitData.spiId, SST25_CMD_SER);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, address>>16);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, address>>8);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, address);
PLIB_SPI_BufferRead(spiInitData.spiId);
SST25CSHigh();
// SPIUnLock(spiInitData.spiId);
// Wait for write end
while(SST25IsWriteBusy());
}
/************************************************************************
* Function: BYTE SST25ReadByte(DWORD address)
*
* Overview: this function reads a byte from the address specified
*
* Input: address
*
* Output: data read
*
************************************************************************/
uint8_t SST25ReadByte(uint32_t address)
{
uint8_t temp;
SST25CSLow();
SPIPut(spiInitData.spiId, SST25_CMD_READ);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, address>>16);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, address>>8);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, address);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, 0);
temp = PLIB_SPI_BufferRead(spiInitData.spiId);
SST25CSHigh();
return (temp);
}
/************************************************************************
* Function: void SST25WriteByte(BYTE data, DWORD address)
*
* Overview: this function writes a byte to the address specified
*
* Input: data to be written and address
*
* Output: none
*
************************************************************************/
void SST25WriteByte(uint8_t data, uint32_t address)
{
SST25WriteEnable();
SST25CSLow();
SPIPut(spiInitData.spiId, SST25_CMD_WRITE);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, address>>16);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, address>>8);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, address);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, data);
PLIB_SPI_BufferRead(spiInitData.spiId);
SST25CSHigh();
// Wait for write end
while(SST25IsWriteBusy());
}
int32_t DRV_SPI_MasterEBMReceive8BitISR( struct DRV_SPI_DRIVER_OBJECT * pDrvInstance )
{
register SPI_MODULE_ID spiId = pDrvInstance->spiId;
register DRV_SPI_JOB_OBJECT * currentJob = pDrvInstance->currentJob;
/* Figure out how many bytes are waiting to be received."*/
uint8_t bufferBytes = PLIB_SPI_FIFOCountGet(spiId, SPI_FIFO_TYPE_RECEIVE);
/* Calculate the maximum number of data bytes that can be received*/
size_t dataUnits = MIN(currentJob->dataLeftToRx, bufferBytes);
size_t counter;
if (dataUnits != 0)
{
bufferBytes -= dataUnits;
currentJob->dataLeftToRx -= dataUnits;
/* Set the buffer location to receive bytes from the SPI to*/
uint8_t *bufferLoc = &(currentJob->rxBuffer[currentJob->dataRxed]);
for (counter = 0; counter < dataUnits; counter++)
{
/* Receive the data from the SPI */
bufferLoc[counter] = PLIB_SPI_BufferRead(spiId);
}
/* Adjust the amount of data that has been received */
currentJob->dataRxed += dataUnits;
/* Update the symbols in progress so we can send more units later */
pDrvInstance->symbolsInProgress -= dataUnits;
}
/* Figure out the maximum number of dummy data to be received */
size_t dummyUnits = MIN(currentJob->dummyLeftToRx, bufferBytes);
if (dummyUnits != 0)
{
/* Lower the number of dummy bytes to be received */
currentJob->dummyLeftToRx -= dummyUnits;
pDrvInstance->symbolsInProgress -= dummyUnits;
for (counter = 0; counter < dummyUnits; counter++)
{
/* Receive and throw away the byte. Note: We cannot just clear the
buffer because we have to keep track of how many symbols/units we
have received, and the number may have increased since we checked
how full the buffer is.*/
PLIB_SPI_BufferRead(spiId);
}
}
/* Figure out how many bytes are left to be received */
size_t bytesLeft = currentJob->dataLeftToRx + currentJob->dummyLeftToRx;
/* If the bytes left are smaller than the HW mark we have to change the interrupt mode */
if (bytesLeft < PLIB_SPI_RX_8BIT_HW_MARK(spiId))
{
PLIB_SPI_FIFOInterruptModeSelect(spiId, SPI_FIFO_INTERRUPT_WHEN_RECEIVE_BUFFER_IS_NOT_EMPTY);
}
return 0;
}
/************************************************************************
* Function: void SST25ResetWriteProtection()
*
* Overview: this function reset write protection bits
*
* Input: none
*
* Output: none
*
************************************************************************/
void SST25ResetWriteProtection(void)
{
#if defined(USE_M25P80)
uint8_t status;
#endif
// while(!SPILock(spiInitData.spiId));
SST25CSLow();
// send write enable command
SPIPut(spiInitData.spiId, SST25_CMD_EWSR);
PLIB_SPI_BufferRead(spiInitData.spiId);
SST25CSHigh();
#if defined(USE_M25P80)
SST25CSLow();
// verify if the WEL bit is set high
while(1)
{
SPIPut(spiInitData.spiId, SST25_CMD_RDSR);
SPIGet(spiInitData.spiId);
status = 0xFF;
while((status & SST25_STATUS_MASK) > 0)
{
SPIPut(spiInitData.spiId, 0);
status = SPIGet(spiInitData.spiId);
}
if ((status & SST25_WEL_STATUS) == SST25_WEL_STATUS)
break;
}
SST25CSHigh();
#endif
SST25CSLow();
SPIPut(spiInitData.spiId, SST25_CMD_WRSR);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, 0);
PLIB_SPI_BufferRead(spiInitData.spiId);
SST25CSHigh();
// SPIUnLock(spiInitData.spiId);
// Wait for write end
while(SST25IsWriteBusy());
}
/************************************************************************
* Function: BYTE SST25IsWriteBusy(void)
*
* Overview: this function reads status register and chek BUSY bit for write operation
*
* Input: none
*
* Output: non zero if busy
*
************************************************************************/
uint8_t SST25IsWriteBusy(void)
{
uint8_t temp;
SST25CSLow();
SPIPut(spiInitData.spiId, SST25_CMD_RDSR);
PLIB_SPI_BufferRead(spiInitData.spiId);
SPIPut(spiInitData.spiId, 0);
temp = PLIB_SPI_BufferRead(spiInitData.spiId);
SST25CSHigh();
return (temp & 0x01);
}
int32_t DRV_SPI0_BufferAddWriteRead(const void * txBuffer, void * rxBuffer, uint32_t size)
{
bool continueLoop;
int32_t txcounter = 0;
int32_t rxcounter = 0;
uint8_t unitsTxed = 0;
const uint8_t maxUnits = 16;
do {
continueLoop = false;
unitsTxed = 0;
if (PLIB_SPI_TransmitBufferIsEmpty(SPI_ID_4))
{
while (!PLIB_SPI_TransmitBufferIsFull(SPI_ID_4) && (txcounter < size) && unitsTxed != maxUnits)
{
PLIB_SPI_BufferWrite(SPI_ID_4, ((uint8_t*)txBuffer)[txcounter]);
txcounter++;
continueLoop = true;
unitsTxed++;
}
}
while (txcounter != rxcounter)
{
while (PLIB_SPI_ReceiverFIFOIsEmpty(SPI_ID_4));
((uint8_t*)rxBuffer)[rxcounter] = PLIB_SPI_BufferRead(SPI_ID_4);
rxcounter++;
continueLoop = true;
}
if (txcounter > rxcounter)
{
continueLoop = true;
}
}while(continueLoop);
return txcounter;
}
int32_t DRV_SPI1_BufferAddWriteRead(const void * txBuffer, void * rxBuffer, uint32_t size)
{
bool continueLoop;
int32_t txcounter = 0;
int32_t rxcounter = 0;
do {
continueLoop = false;
if(!PLIB_SPI_TransmitBufferIsFull(SPI_ID_2) && txcounter < size)
{
PLIB_SPI_BufferWrite(SPI_ID_2, ((uint8_t*)txBuffer)[txcounter]);
txcounter++;
continueLoop = true;
}
while (txcounter != rxcounter)
{
while(!PLIB_SPI_ReceiverBufferIsFull(SPI_ID_2));
((uint8_t*)rxBuffer)[rxcounter] = PLIB_SPI_BufferRead(SPI_ID_2);
rxcounter++;
continueLoop = true;
}
if (txcounter > rxcounter)
{
continueLoop = true;
}
}while(continueLoop);
return txcounter;
}
/************************************************************************
* Function: SST25WriteEnable()
*
* Overview: this function allows write/erase SST25. Must be called
* before every write/erase command.
*
* Input: none
*
* Output: none
*
************************************************************************/
void SST25WriteEnable(void)
{
SST25CSLow();
SPIPut(spiInitData.spiId, SST25_CMD_WREN);
PLIB_SPI_BufferRead(spiInitData.spiId);
SST25CSHigh();
}
/************************************************************************
* Function: void SST25ChipErase(void)
*
* Overview: chip erase
*
* Input: none
*
************************************************************************/
void SST25ChipErase(void)
{
#if defined(USE_M25P80)
uint8_t status;
#endif
#if defined(USE_SST25VF016)
SST25WriteEnable();
#endif
// while(!SPILock(spiInitData.spiId));
SST25CSLow();
#if defined(USE_M25P80)
// send write enable command
SPIPut(spiInitData.spiId, SST25_CMD_EWSR);
SPIGet(spiInitData.spiId);
SST25CSHigh();
Nop();
SST25CSLow();
// verify if the WEL bit is set high
while(1)
{
SPIPut(spiInitData.spiId, SST25_CMD_RDSR);
SPIGet(spiInitData.spiId);
status = 0xFF;
while((status & SST25_STATUS_MASK) > 0)
{
SPIPut(spiInitData.spiId, 0);
status = SPIGet(spiInitData.spiId);
}
if ((status & SST25_WEL_STATUS) == SST25_WEL_STATUS)
break;
}
SST25CSHigh();
#endif
SST25CSLow();
SPIPut(spiInitData.spiId, SST25_CMD_ERASE);
PLIB_SPI_BufferRead(spiInitData.spiId);
SST25CSHigh();
#if defined (USE_M25P80)
// wait for BULK ERASE to be done
SST25CSLow();
SPIPut(spiInitData.spiId, SST25_CMD_RDSR);
SPIGet(spiInitData.spiId);
while(1)
{
SPIPut(spiInitData.spiId, 0);
status = (SPIGet(spiInitData.spiId)& SST25_WIP_STATUS);
if ((status & SST25_WIP_STATUS) == 0)
break;
}
SST25CSHigh();
#endif
// SPIUnLock(spiInitData.spiId);
// Wait for write end
while(SST25IsWriteBusy());
}