Problem making AVR assembler work in the Arduino IDE

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AVR_Beginner
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Posted by AVR_Beginner: Wed. Nov 22, 2017 - 11:33 PM
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I am a beginner! I have the latest Arduino IDE (1.8.3 I believe ) installed on my other computer. I am learning to do AVR assembler out of a bunch of books. 

 

All is well and I am writing functions, geting values, twiddling ports and pins to my heart's delight... Except some things just won't compile.

 

MyArray:     .DB   1,2,3,4,5,6   

will not compile.

 

.DEF statements will not either 

 

LPM will not put the value found at the address (specified in the Z register) into R0

 

I can work around all these but I still would like it all to work "right" and as it should.  I will not be supprised if I come across more things that should work but don't.

Aside from these and a few other glitches I seem to be able to write small, elementary code and verify the returned values are correct.

 

My question is there a list of know issues  trying to do AVR assembler in the Arduino IDE and any workarounds? 

 

Thanks in advance.

I am a new AVR programmer. I am learning alone out of books, the Internet, etc. Please excuse me if I ask simple questions. Thanks.

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Tools, Arduino
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awneil
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Posted by awneil: Wed. Nov 22, 2017 - 11:55 PM
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AVR_Beginner wrote:
MyArray:     .DB   1,2,3,4,5,6   

will not compile.

What do you mean, "will not compile"?

Are you getting error message(s)? If so, what are they?

 

Note that "Compile" is what you do to High-Level Languages; the term for Assembler is "Assemble".

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
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  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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AVR_Beginner
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Posted by AVR_Beginner: Thu. Nov 23, 2017 - 12:04 AM
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awneil:

 

 

Thank you.  Assemble  :-)

 

Here is the error with .DB  Please note the .BYTE works fine though. I don't know why.

 

sketch\limit1.S: Assembler messages:

sketch\limit1.S:117: Error: unknown pseudo-op: `.db'

exit status 1
Error compiling for board Arduino/Genuino Uno.

 

I am a new AVR programmer. I am learning alone out of books, the Internet, etc. Please excuse me if I ask simple questions. Thanks.

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AVR_Beginner
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Posted by AVR_Beginner: Thu. Nov 23, 2017 - 12:06 AM
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Yet this code snippet directly above the "MyArray" I am trying to make work assembles fine and I can access it fine.

 

Table2:   
//   index        0     1       2       3       4       5      6      7  
           .BYTE  10,   21,     32,     43,     54,     65,    76,    87  
//                8     9       10      11      12      13     14     15
           .BYTE  98,   109,    110,    121,    132,    143,   154,   165
//                16    17      18      19      20      21     22     23           
           .BYTE  176,  187,    198,    209,    210,    221,   232,   243
           .BALIGN 2

 

I am a new AVR programmer. I am learning alone out of books, the Internet, etc. Please excuse me if I ask simple questions. Thanks.

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awneil
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Posted by awneil: Thu. Nov 23, 2017 - 12:08 AM (Reply to #3)
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So what assembler does the Arduino IDE actually use?

 

There is no standard Assembler syntax - they are all different.

 

Have you RTFM for the particular Assembler to check if it is supposed to accept ".DB" ?  and, if it is supposed to accept ".DB", what the correct syntax is ...

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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AVR_Beginner
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Posted by AVR_Beginner: Thu. Nov 23, 2017 - 12:11 AM
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I don't know the exact assembler Arduino uses under the hood.

 

I would RTFM if there was a FM to read. So far I have not found any FM for the assembler version Arduino uses and I have not found any FM that would point me to differences / changes / etc from AVR assembler... Thus my asking the questions here.

I am a new AVR programmer. I am learning alone out of books, the Internet, etc. Please excuse me if I ask simple questions. Thanks.

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awneil
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Posted by awneil: Thu. Nov 23, 2017 - 12:21 AM (Reply to #6)
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AVR_Beginner wrote:
I don't know the exact assembler Arduino uses under the hood.

It matters - you need to know that!

 

I would RTFM if there was a FM to read.

Knowing which assembler it is is key to finding the FM for it!

 

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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AVR_Beginner
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Posted by AVR_Beginner: Thu. Nov 23, 2017 - 12:25 AM
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OK... so being this is an Arduino forum on a web page with assembler experts... can some one please tell me exactly which assembler I have and where any manual / compatablity matrix exists if any. 

 

I frankly don't know how to dive into Arduino and Java and find it out.

I am a new AVR programmer. I am learning alone out of books, the Internet, etc. Please excuse me if I ask simple questions. Thanks.

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awneil
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Posted by awneil: Thu. Nov 23, 2017 - 12:31 AM (Reply to #8)
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There's an Arduino forum here only because most Arduinos are AVRs.

 

The place to find the experts with specific knowledge of the Arduino IDE, etc, is the actual Arduino forums: https://forum.arduino.cc/

 

 

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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AVR_Beginner
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Posted by AVR_Beginner: Thu. Nov 23, 2017 - 12:36 AM
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I just posted the question there.

I am a new AVR programmer. I am learning alone out of books, the Internet, etc. Please excuse me if I ask simple questions. Thanks.

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awneil
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Posted by awneil: Thu. Nov 23, 2017 - 12:42 AM (Reply to #10)
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When cross-posting the same question to multiple forums always give links between them - so that people can see what's going on.

 

Otherwise someone may waste their time giving an answer in one which has already been given in the other.

 

 

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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Greg_Muth
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Posted by Greg_Muth: Thu. Nov 23, 2017 - 12:58 AM
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can some one please tell me exactly which assembler I have

D:\Users\mutha>"C:\Program Files (x86)\Arduino\hardware\tools\avr\avr\bin\as.exe" -v
GNU assembler version 2.26 (avr) using BFD version (GNU Binutils) 2.26.20160125

 

Greg Muth

Portland, OR, US

Xplained/Pro/Mini Boards mostly

 

Make Xmega Great Again!

 

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El Tangas
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Posted by El Tangas: Thu. Nov 23, 2017 - 01:54 AM
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Arduino uses the gnu assembler, called "as", more specifically "avr-as" in this case. Directive ".db" is from Atmel assembler.

 

You need to replace ".db" by ".byte". A list of available directives: https://sourceware.org/binutils/...

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awneil
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Posted by awneil: Thu. Nov 23, 2017 - 02:12 AM
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So the required manual is: https://sourceware.org/binutils/docs/as/

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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AVR_Beginner
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Posted by AVR_Beginner: Thu. Nov 23, 2017 - 08:36 PM
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awneil, greg, El and everyone else: Thank you!  I am gonna download and start one it after Thanksgiving dinner... provided the triptophan doesn't nuke me first LOL

I am a new AVR programmer. I am learning alone out of books, the Internet, etc. Please excuse me if I ask simple questions. Thanks.

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