//*****************************************************************************
//
//! GetPacket() receives a data packet.
//!
//! \param pucData is the location to store the data received from the device.
//! \param pucSize is the number of bytes returned in the pucData buffer that
//! was provided.
//!
//! This function receives a packet of data from UART port.
//!
//! \returns The function returns zero to indicated success while any non-zero
//! value indicates a failure.
//
//*****************************************************************************
int
GetPacket(unsigned char *pucData, unsigned char *pucSize)
{
unsigned char ucCheckSum;
unsigned char ucSize;
//
// Get the size waht and the checksum.
//
do
{
if(UARTReceiveData(&ucSize, 1))
{
return(-1);
}
}
while(ucSize == 0);
if(UARTReceiveData(&ucCheckSum, 1))
{
return(-1);
}
*pucSize = ucSize - 2;
if(UARTReceiveData(pucData, *pucSize))
{
*pucSize = 0;
return(-1);
}
//
// Calculate the checksum from the data.
//
if(CheckSum(pucData, *pucSize) != ucCheckSum)
{
*pucSize = 0;
return(NakPacket());
}
return(AckPacket());
}
//*****************************************************************************
//
//! GetPacket() receives a data packet.
//!
//! \param pui8Data is the location to store the data received from the device.
//! \param pui8Size is the number of bytes returned in the pui8Data buffer that
//! was provided.
//!
//! This function receives a packet of data from UART port.
//!
//! \returns The function returns zero to indicated success while any non-zero
//! value indicates a failure.
//
//*****************************************************************************
int32_t
GetPacket(uint8_t *pui8Data, uint8_t *pui8Size)
{
uint8_t ui8CheckSum;
uint8_t ui8Size;
//
// Get the size and the checksum.
//
do
{
if(UARTReceiveData(&ui8Size, 1))
{
return(-1);
}
}
while(ui8Size == 0);
if(UARTReceiveData(&ui8CheckSum, 1))
{
return(-1);
}
*pui8Size = ui8Size - 2;
if(UARTReceiveData(pui8Data, *pui8Size))
{
*pui8Size = 0;
return(-1);
}
//
// Calculate the checksum from the data.
//
if(CheckSum(pui8Data, *pui8Size) != ui8CheckSum)
{
*pui8Size = 0;
return(NakPacket());
}
return(AckPacket());
}
