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main.c File Reference


Detailed Description

Atmel Corporation

File : main.c Compiler : IAR EWAAVR 2.28a/3.10c Revision :

Revision
1.1
Date :
Date
Wednesday, July 13, 2005 10:43:44 UTC
Updated by :
Author
omella

Support mail : avr@atmel.com

Supported devices : All devices with a ADC can be used. The example is written for ATmega16

AppNote : AVR121 - Enhancing ADC resolution by oversampling

Description : Example of how to use oversampling to increase the resolution This code shows an example of how to increase the ADCs resolution from 10-bit to 16-bit. It might be usefull to write every single ADC result to UART, to ensure that LSB toggles

Definition in file main.c.

#include <iom16.h>
#include <inavr.h>

Go to the source code of this file.

Functions

__interrupt void ADCinterrupt (void)
 ADC interrupt routine.
void init_adc (void)
 Enables ADC, Interrupt enabled, ADC-clock=125kHz, VREF=AREF.
void init_counter (void)
 Fast PWM, Clk / 64, Clear OC2 on compare match, 50% duty cycle.
void oversampled (void)
 Compensate errors, scaling result, round up, increase averaged result.

Variables

double accumulator = 0
 Accumulated 10-bit samples.
short samples = 0
 Number of conversions.
short temp = 0
 Temporary variable.
double Vin = 0
 16-bit float number result


Function Documentation

__interrupt void ADCinterrupt void   ) 
 

Definition at line 41 of file main.c.

References accumulator, and samples.

void init_adc void   ) 
 

Definition at line 54 of file main_uart.c.

Referenced by main().

void init_counter void   ) 
 

Definition at line 78 of file main_uart.c.

Referenced by main().

void oversampled void   ) 
 

Definition at line 160 of file main_uart.c.

References accumulator, samples, temp, vin(), write_16bit(), and write_space().

Referenced by main().


Variable Documentation

double accumulator = 0
 

< Including header file Including header file

Definition at line 29 of file main.c.

Referenced by ADCinterrupt(), oversampled(), vin(), and write_16bit().

short samples = 0
 

Definition at line 32 of file main.c.

Referenced by ADCinterrupt(), main(), and oversampled().

short temp = 0
 

Definition at line 31 of file main.c.

Referenced by oversampled().

double Vin = 0
 

Definition at line 30 of file main.c.

Referenced by vin().


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