Rlp sound reading Panda 2

I am tring to get sound samples from microphone through Fez Panda 2. I am using rlp to accomplish that. Here is my code:

int GHAL_AnalogIn_Read(unsigned char channel)
{
        return ((*((int*)(ADC_DATA_BASE_ADDRESS) + channel)) >>8) & 0x3FF;
}
int ReadAudio(unsigned int *generalArray, void **args, unsigned int argsCount ,unsigned int *argSize)
{
        unsigned char *buffer = (unsigned char*)args[0];
        int buffer_lengh = argSize[0];
        unsigned char channel = *(unsigned char*)args[1];
        int i=0;
        while(i<buffer_lengh)
        {
           buffer[i] = GHAL_AnalogIn_Read(channel);
           i++;
           RLPext->Delay(100);
        }
        return 0;
}

The problem is that I need float values not unsigned char because I'm performing fft on these sound samples. So I need modification that will provide me float values. Any ideas?

unsigned char someValueThatYouHave = 42;

float someValueThatYoudPrefer = (float)someValueThatYouHave;

done.

@evildictaitor:I tried that, of course, but it seems to me that you didn't quite uderstand what I need to do. Simple cast would not solve the problem. I need modification of this function

int GHAL_AnalogIn_Read(unsigned char channel)

{
        return ((*((int*)(ADC_DATA_BASE_ADDRESS) + channel)) >>8) & 0x3FF;
}

or something like that...