AT91SAM7S/src/adc.c File Reference

#include "adc.h"
#include "board.h"

Defines
#define	TRGEN   (0x1)
	Hardware triggering.
#define	TRGSEL   (0x0)
	Use a Timer output signal (on rising edge) from TIOA0 (for this example).
#define	LOWRES   (0x1)
	8-bit result output
#define	SLEEP   (0x0)
	Normal Mode.
#define	PRESCAL   (0x2)
	AD CLK = 8 MHz.
#define	STARTUP   (0xf)
	This time period must be higher than 20 µs and not 20 ms;.
#define	SHTIM   (0x2)
	Sample & Hold time.
Functions
void	ADCInit (void)

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Detailed Description

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Define Documentation

#define SHTIM   (0x2)

Sample & Hold time.

Must be higher than 3 ADC clock cycles but depends on output impedance of the analog driver to the ADC input.
Sample & Hold Time = (SHTIM+1) / ADCClock

#define STARTUP   (0xf)

This time period must be higher than 20 µs and not 20 ms;.

Startup Time = (STARTUP+1) * 8 / ADCClock

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Function Documentation

void ADCInit

(

void

)

Init A/D converter