adc_filtr.c File Reference

#include <lpc21xx.h>
#include <types.h>
#include "adc_filtr.h"
#include <stdlib.h>
#include <string.h>
#include <deb_led.h>

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Defines
#define	ADCCH0   22
	ADC0 value for PINSEL.
#define	ADCCH1   24
	ADC1 value for PINSEL.
#define	ADCCH2   26
	ADC2 value for PINSEL.
#define	ADCCH3   28
	ADC3 value for PINSEL.
Functions
int	compare (const void *a, const void *b)
	Comparsion function for quicksort.
void	adc_filter (unsigned char chan)
	Median filter for ADC.
void	adc_isr_filtr (void)
	ADC ISR routine.
void	init_adc_filter (unsigned rx_isr_vect)
	Inicializes ADC service for all ADC (4) channels and installs ISR routine to VIC.

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Define Documentation

#define ADCCH0   22

ADC0 value for PINSEL.

#define ADCCH1   24

ADC1 value for PINSEL.

#define ADCCH2   26

ADC2 value for PINSEL.

#define ADCCH3   28

ADC3 value for PINSEL.

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Function Documentation

void adc_filter

(

unsigned char

chan

)

Median filter for ADC.

If new data is available the median is recalculated. This function may be called from main function, it should take long time to calculate the median for all ADC value.

Parameters:

chan

bit oriented (0~3) value, defines which ADC channels have new data

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void adc_isr_filtr

(

void

)

ADC ISR routine.

This routine reads selected ADC value and multiplies it by ADC_MUL and adds ADC_OFFSET to calculate the volage (3.25mV/div). After this reading the next ADC channel is set up for measuring.

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int compare	(	const void *	a,
		const void *	b
	)

Comparsion function for quicksort.

Parameters:

	*a	first number for comparion
	*b	second number for comparion

Returns:

1 if b is higher than a

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void init_adc_filter

(

unsigned

rx_isr_vect

)

Inicializes ADC service for all ADC (4) channels and installs ISR routine to VIC.

Automaticly starts the conversion of first channel on given conversion frequency.

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