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analog.h: document and clean up. 

No functional change.
This commit is contained in:
Markus Hitter 2015-05-11 00:54:18 +02:00
parent efa1e9bcbb
commit 881629b74c
2 changed files with 46 additions and 22 deletions
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35
analog.h
View File

@ -3,12 +3,31 @@
#include <stdint.h>
#ifndef SIMULATOR
/** \def REFERENCE_AREF
This compares the voltage to be measured against the voltage on the Aref pin.
This also requires a voltage to be actually provided on the Aref pin, which
none of the commonly available controllers or Arduinos do.
*/
#define REFERENCE_AREF 0
/** \def REFERENCE_AVCC
This compares the voltage to be measured against the voltage on the Aref pin,
but also connects AVcc to Aref, so no external voltage is required. Using
this is said to be more accurate than doing this connection externally, on
the pins of the chip, so this is the most commonly used option.
*/
#define REFERENCE_AVCC 64
#if defined (__AVR_ATmega168__) || defined (__AVR_ATmega328__) || defined (__AVR_ATmega328P__)
/** \def REFERENCE_1V1
\def REFERENCE_2V56
These compare the voltage to be measured against internally created
1.1 or 2.56 volts. Not useful on commonly available RepRap controllers,
but might be a good choice for custom devices providing only a low voltage.
*/
#if defined (__AVR_ATmega168__) || defined (__AVR_ATmega168P__) || \
defined (__AVR_ATmega328__) || defined (__AVR_ATmega328P__)
#define REFERENCE_1V1 192
#elif defined (__AVR_ATmega_644__) || defined (__AVR_ATmega644p__)
#else
#define REFERENCE_1V1 128
#define REFERENCE_2V56 192
#endif
@ -23,16 +42,8 @@
#define REFERENCE REFERENCE_AVCC
#ifndef REFERENCE
#warning define REFERENCE as one of
#if defined (__AVR_ATmega168__) || defined (__AVR_ATmega328__) || defined (__AVR_ATmega328P__)
#warning REFERENCE_AREF, REFERENCE_AVCC or REFERENCE_1V1
#elif defined (__AVR_ATmega_644__) || defined (__AVR_ATmega644p__)
#warning REFERENCE_AREF, REFERENCE_AVCC, REFERENCE_1V1 or REFERENCE_2V56
#error REFERENCE undefined. See analog.h on how to choose it.
#endif
#warning in your config.h
#error REFERENCE undefined
#endif
#endif /* SIMULATOR */
void analog_init(void);

33
extruder/analog.h
View File

@ -3,11 +3,31 @@
#include <stdint.h>
/** \def REFERENCE_AREF
This compares the voltage to be measured against the voltage on the Aref pin.
This also requires a voltage to be actually provided on the Aref pin, which
none of the commonly available controllers or Arduinos do.
*/
#define REFERENCE_AREF 0
/** \def REFERENCE_AVCC
This compares the voltage to be measured against the voltage on the Aref pin,
but also connects AVcc to Aref, so no external voltage is required. Using
this is said to be more accurate than doing this connection externally, on
the pins of the chip, so this is the most commonly used option.
*/
#define REFERENCE_AVCC 64
#if defined (__AVR_ATmega168__) || defined (__AVR_ATmega328__) || defined (__AVR_ATmega328P__)
/** \def REFERENCE_1V1
\def REFERENCE_2V56
These compare the voltage to be measured against internally created
1.1 or 2.56 volts. Not useful on commonly available RepRap controllers,
but might be a good choice for custom devices providing only a low voltage.
*/
#if defined (__AVR_ATmega168__) || defined (__AVR_ATmega168P__) || \
defined (__AVR_ATmega328__) || defined (__AVR_ATmega328P__)
#define REFERENCE_1V1 192
#elif defined (__AVR_ATmega_644__) || defined (__AVR_ATmega644p__)
#else
#define REFERENCE_1V1 128
#define REFERENCE_2V56 192
#endif
@ -22,14 +42,7 @@
#define REFERENCE REFERENCE_AVCC
#ifndef REFERENCE
#warning define REFERENCE as one of
#if defined (__AVR_ATmega168__) || defined (__AVR_ATmega328__) || defined (__AVR_ATmega328P__)
#warning REFERENCE_AREF, REFERENCE_AVCC or REFERENCE_1V1
#elif defined (__AVR_ATmega_644__) || defined (__AVR_ATmega644p__)
#warning REFERENCE_AREF, REFERENCE_AVCC, REFERENCE_1V1 or REFERENCE_2V56
#endif
#warning in your config.h
#error REFERENCE undefined
#error REFERENCE undefined. See analog.h on how to choose it.
#endif
void analog_init(void);