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Add method that directly return the adc value and get average value by digital slide filtering algorithm #4

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Add method that directly return the adc value and get average value by digital slide filtering algorithm #4

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87657ad
add a method that returnadc int directly
cheng3100 Jan 7, 2018
940f1cf
slide flitering
cheng3100 Jan 7, 2018
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42 changes: 42 additions & 0 deletions Vcc.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,9 @@

#include "Vcc.h"

//time to get the averge adc value
#define AVER_NUM 20

Vcc::Vcc( const float correction )
: m_correction(correction)
{
Expand Down Expand Up @@ -76,3 +79,42 @@ float Vcc::Read_Perc(const float range_min, const float range_max, const boolean

return perc;
}

int Vcc::Read_ADC(void)
{
// Read 1.1V reference against AVcc
// set the reference to Vcc and the measurement to the internal 1.1V reference
if (ADMUX != ADMUX_VCCWRT1V1)
{
ADMUX = ADMUX_VCCWRT1V1;

// Bandgap reference start-up time: max 70us
// Wait for Vref to settle.
delayMicroseconds(350);
}

// Start conversion and wait for it to finish.
ADCSRA |= _BV(ADSC);
while (bit_is_set(ADCSRA,ADSC)) {};
return ADC;
}

int Vcc::Read_ADC(int num)
{
static int Vcc_int[AVER_NUM]={0};
static int k = 0;
static int sum = 0;
if (num > AVER_NUM || num <0)
return -1;

sum -= Vcc_int[k];
Vcc_int[k++] = Read_ADC();
sum += Vcc_int[k-1];

if (k>num-1)
{
k = 0;
}

return sum/num;
}
9 changes: 9 additions & 0 deletions Vcc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,15 @@ class Vcc
* @return Current Vcc level, in Volts.
*/
float Read_Volts(void);
/**
* return the current adc value by int
*/
int Read_ADC(void);
/**
* return the current adc value using digital slide filtering by num times
*
*/
int Read_ADC(int num);

/**
* Retrieve current Vcc level. The total voltage range shall be passed
Expand Down