I just downloaded the latest version of the Arduino software (1.6.5). However, when I look into the Application Support folder under Library (I have a mac), I find that I have a folder named 1.6.3:

Library ▸ Arduino15 ▸ packages ▸ arduino ▸ hardware ▸ sam ▸ 1.6.3

Does this mean there is a hidden 1.6.5 folder that I am not seeing?

BTW, this issue surfaced, because I am trying to fiddle around with the ADC clock speed, but it seems that nothing is happening:

void setup() {
  #define ADC_FREQ_MAX = 1;

void loop() {

gives me:

opamp.ino: In function 'void setup()':
opamp:2: error: expected primary-expression before '=' token
opamp.ino:4:18: note: in expansion of macro 'ADC_FREQ_MAX'
opamp:4: error: expected primary-expression before ')' token
opamp:4: error: expected ';' before ')' token
expected primary-expression before '=' token
  • It could simply be that the versions of code within that folder are at a level called 1.6.3. Big applications are usually componentized which means that the release level of the app as a whole may be different from the release levels of its parts. I could easily imagine that inside the 1.6.5 IDE there are parts that haven't changed since 1.6.3 and hence retain that version identity. – Kolban Jun 19 '15 at 0:42
  • Ok, but I am changing the ADC frequency to like 1Hz, and I can't see any noticeable change, i.e. the analogRead() function still samples way faster than that - an apparent contradiction (I've even restarted the IDE) – David Roberts Jun 19 '15 at 0:43
  • 1
    Your define is incorrect, it should be #define ADC_FREQ_MAX 1 only, no =, no ;. – jfpoilpret Jun 19 '15 at 4:38
  • It's likely the different versions have been installed in different places - system wide vs. user-specific, etc. – Chris Stratton Jul 6 '17 at 19:03
  • I'm voting to close this question because there isn't a single, specific clearly answerable question here, and the question has been abandoned in this state long enough that it is unlikely to ever be improved. – Chris Stratton Jul 6 '17 at 19:04

1.6.5 is the version of the Arduino IDE.

1.6.3 is the version of the Arduino SAM Boards package that you have installed.

Does this mean there is a hidden 1.6.5 folder that I am not seeing?

Library/Arduino15 is where your preferences.txt file and Boards Manager index files are stored. Library/Arduino15/packages is where hardware packages installed via Tools > Board > Boards Manager are stored. The Arduino IDE will be located elsewhere on your hard drive. If you need to find it here is an easy way:

  1. Tools > Examples > 01.Basics > BareMinimum
  2. Sketch > Show Sketch Folder - this will open the Examples/01.Basics/BareMinimum subfolder of the Arduino IDE installation folder.

BTW, this issue surfaced...

That's off the topic of your question and already answered in a comment on your question so I will refrain from answering it.

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The error you see is because of the equal sign in your #define. That equal should not be there. So the line that uses it ends up being.

Serial.println(= 1);

Which is obviously wrong.

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