Barcode_Sampling

Files
file	barcode_sample.c
	Barcode Sampling.
Functions
void	barcodeSample (struct BC_STRUCT *p, unsigned int count)
	General purpose barcode sampling.
void	barcodeOverflow (struct BC_STRUCT *p)
	Barcode sample overflow.

---

Function Documentation

void barcodeOverflow

(

struct BC_STRUCT *

p

)

Barcode sample overflow.

Parameters:

*p

points to channel context

Returns:

None

Definition at line 113 of file barcode_sample.c.

References BC_STRUCT::sample_ctr, BC_STRUCT::sample_ptr, and BC_STRUCT::sample_state.

                                         {

    // Abort if less than the minimum required samples
    if(p->sample_ctr < MIN_BARCODE_SAMPLES){
        p->sample_state = WAITING;
    }

    // Store the overflow count and flag as ready               
    else{
        *p->sample_ptr++ = 0;
        p->sample_state = READY;
    }
}

void barcodeSample	(	struct BC_STRUCT *	p,
		unsigned int	count
	)

General purpose barcode sampling.

Parameters:

	*p	points to channel context
	count	is sample count

Returns:

None

Definition at line 72 of file barcode_sample.c.

References BC_STRUCT::overflow_ctr, BC_STRUCT::sample_buffer, BC_STRUCT::sample_ctr, BC_STRUCT::sample_ptr, and BC_STRUCT::sample_state.

{
    // Leave if sample is already available
    if(p->sample_state == READY){
        return;
    }

    // Arm overflow counter
    p->overflow_ctr = BARCODE_OVERFLOW_TIME;

    // Initialize if just starting
    if(p->sample_state != BUSY){
        p->sample_ctr = 0;
        p->sample_ptr = p->sample_buffer;
        p->sample_state = BUSY;
        return;
    }

    // Already Sampling

    // Buffer full?
    if(p->sample_ctr++ >= (sizeof p->sample_buffer / 2) - 1){

        // Kill the sampling
        p->sample_ctr = 0;
        p->overflow_ctr = 1;
        p->sample_state = WAITING;
        return;
    }

    // Store the count
    *p->sample_ptr++ = count;
}