Example of FAST ADC does not work for Arduino Due

[jglodo]

Hi,
I tried to compile a simple code included at the end of this text with the board set to Arduino DUE and I received the following errors:

sketch_nov26a.ino: In function 'void setup()':
sketch_nov26a:16: error: 'ADCSRA' was not declared in this scope
sketch_nov26a:16: error: '_SFR_BYTE' was not declared in this scope
sketch_nov26a:16: error: 'ADPS2' was not declared in this scope
sketch_nov26a:16: error: '_BV' was not declared in this scope
sketch_nov26a:17: error: 'ADPS1' was not declared in this scope
sketch_nov26a:18: error: 'ADPS0' was not declared in this scope

If I select the Arduino UNO board, there is no problem. I tried to look around for a solution but
so far I have not been able to locate any, and unfortunately I do not have enough experience to solve it.
If it helps, it seems like <avr/io.h> is missing for DUE. #import <avr/io.h> works fine for UNO.

Regards,
Jarek

================= Example ====================

define FASTADC 1

ifndef cbi

define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))

endif

ifndef sbi

define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))

endif

int value=0;

void setup()
{
Serial.begin(9600) ;

if FASTADC

sbi(ADCSRA,ADPS2) ;
cbi(ADCSRA,ADPS1) ;
cbi(ADCSRA,ADPS0) ;

endif

}

void loop()
{
for (int i=0;i<100;i++) value = analogRead(0);
}

[lestofante]

this is not a bug.
arduino DUE probably doesn't have register ADCSRA, so it is also missing
ADPS2, ADPS1, ADPS0. This is not a bug, you should use arduino due register.
missing _SFR_BYTE e _BV are avr specific macro (avr/sfr_defs.h), you should
look for ARM equivalent (the DUE use an ARM processor)

that means you can just copy-paste low level code from two completely
different hardware architecture

2012/11/27 jglodo notifications@github.com

Hi,
I tried to compile a simple code included at the end of this text with the
board set to Arduino DUE and I received the following errors:

sketch_nov26a.ino: In function 'void setup()':
sketch_nov26a:16: error: 'ADCSRA' was not declared in this scope
sketch_nov26a:16: error: '_SFR_BYTE' was not declared in this scope
sketch_nov26a:16: error: 'ADPS2' was not declared in this scope
sketch_nov26a:16: error: '_BV' was not declared in this scope
sketch_nov26a:17: error: 'ADPS1' was not declared in this scope
sketch_nov26a:18: error: 'ADPS0' was not declared in this scope

If I select the Arduino UNO board, there is no problem. I tried to look
around for a solution but
so far I have not been able to locate any, and unfortunately I do not have
enough experience to solve it.
If it helps, it seems like is missing for DUE. #import works fine for UNO.

Regards,
Jarek

================= Example ====================

#define FASTADC 1
#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif
#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif

int value=0;

void setup()
{
Serial.begin(9600) ;

#if FASTADC
sbi(ADCSRA,ADPS2) ;
cbi(ADCSRA,ADPS1) ;
cbi(ADCSRA,ADPS0) ;
#endif
}

void loop()
{
for (int i=0;i<100;i++) value = analogRead(0);
}

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/1137.

[jglodo]

Thanks for the explanation. Appreciate it.