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POArduino Assembler programming: Nothing happens
 

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  1. POArduino Assembler programming: Nothing happens
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    <p>Hi StackOverflow community,</p> <p>I am trying to program my old Arduino Duemilanove Board (Atmega 168V-10PU) in Assembler. I tried it a few times before but everytime the code was not executed. So i tried to program an equivalent test program in C, and it worked. Here it is:</p> <pre><code>// file led.c #include &lt;avr/io.h&gt; int main(void) { DDRB = 0xFF; PORTB = 0xFF; while (1) { asm("nop\n"); } return 0; } </code></pre> <p>The asm dump of the compiler results in (shortened),</p> <pre><code>ldi r24,lo8(-1) ; tmp44, out 0x4,r24 ; MEM[(volatile uint8_t *)36B], tmp44 out 0x5,r24 ; MEM[(volatile uint8_t *)37B], tmp44 </code></pre> <p>which works and activates the LED at Arduino Pin 13 (AVR pin PB5).</p> <p>But when I use this asm file,</p> <pre><code>// file led.S #include "avr/io.h" .global main main: ldi r24, 0xFF out DDRB, r24 out PORTB, r24 end: jmp end </code></pre> <p>the compiler dump results in (shortened),</p> <pre><code>ldi r24, 0xFF out ((0x04) + 0x20), r24 out ((0x05) + 0x20), r24 </code></pre> <p>what might explain why nothing happens.</p> <p>In addition here are the makefiles for the <a href="http://pastebin.com/5hdzbwxX" rel="nofollow">C version</a> and the <a href="http://pastebin.com/4yur5FAc" rel="nofollow">Assembler version</a></p> <p>Thanks for helping!</p> <p>EDIT: Here are also the full assembler dump files of the <a href="http://pastebin.com/fns0MPnb" rel="nofollow">C version</a> and the <a href="http://pastebin.com/jPG1Vc5K" rel="nofollow">Assembler version</a></p> <p>EDIT 2: I looked up the register addresses in the include file iom168.h, which references to iomx8.h, where it says <code>#define PORTB _SFR_IO8 (0x05)</code>. The compiler follows the include chain</p> <pre><code>io.h -&gt; iom168.h -&gt; iomx8.h io.h -&gt; common.h -&gt; sfr_defs.h </code></pre> <p>In sfr_defs.h is written:</p> <pre><code>#define _SFR_IO8(io_addr) ((io_addr) + __SFR_OFFSET) </code></pre> <p>A few more lines upwards the offset is defined:</p> <pre><code>#ifndef __SFR_OFFSET /* Define as 0 before including this file for compatibility with old asm sources that don't subtract __SFR_OFFSET from symbolic I/O addresses. */ # if __AVR_ARCH__ &gt;= 100 # define __SFR_OFFSET 0x00 # else # define __SFR_OFFSET 0x20 # endif #endif </code></pre> <p>(Sorry for the formatting) Any idea where this error comes from?</p>
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    1. COObviously, the DDRB and PORTB resolve differently in your assembly file, so could you be using the wrong version of io.h where these are presumably defined?
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    2. COI just added #define __SFR_OFFSET 0x00 at the beginning of my assembler source file. In the asm dump it shows now `out ((0x04) + 0x00), r24` and `out ((0x05) + 0x00), r24` and it works.
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