FIFO.c

Go to the documentation of this file.

#include "FIFO.h"


//*****************************************************************************
//
// Function definitions
//
//*****************************************************************************


tBoolean FIFO_isBufferFull( unsigned int *pulRead, unsigned int *pulWrite, unsigned int ulSize )
{
    //  if the writing pointer catch up the read pointer the fifo is full
    return ( ( ( ( *pulWrite + 1 ) % ulSize ) == *pulRead ) ? 1 : 0 );
}


tBoolean FIFO_isBufferEmpty( unsigned int *pulRead, unsigned int *pulWrite )
{
    // if the number of the read characters are the same as the written the fifo is empty
    return ( ( *pulWrite  == *pulRead ) ? 1 : 0 );
}


unsigned int FIFO_getBufferCount( unsigned int *pulRead, unsigned int *pulWrite, unsigned int ulSize )
{
    return ( ( *pulWrite >= *pulRead ) ? ( *pulWrite - *pulRead ) : ( ulSize - ( *pulRead - *pulWrite ) ) );
}