Assemble in C

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originally posted by sriram_k@Mar 20 2007, 08:24 AM

hi

i am i am new to nios. i want to insert an asm code in c prog...

in microcontroller prog..... i use# pragma...

this command is not working in nios ide. plz tell me in what way i can insert my

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Have a try on the inline asm, which basically enable users to write assembly instructions directly. For example:

 asm ("stw    r0,  16(sp)");

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originally posted by arrive+mar 20 2007, 04:13 pm--><div class='quotetop'>quote (arrive @ mar 20 2007, 04:13 pm)</div>

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<!--quotebegin-sriram_k@Mar 20 2007, 08:24 AM

hi

i am i am new to nios. i want to insert an asm code in c prog...

in microcontroller prog..... i use# pragma...

this command is not working in nios ide. plz tell me in what way i can insert my

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=22362)

--- quote end ---

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Have a try on the inline asm, which basically enable users to write assembly instructions directly. For example:

 asm ("stw    r0,  16(sp)");

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=22365)</div>

[/b]

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Just a small example:

__asm__ __volatile__("mov r2, %0 \n\t"

"mov r3, %1 \n\t"

"ldw r4, 0(r2) \n\t"

"stw r4, 312(r3) \n\t"

: // No output needed !

:"r"(var_a),"r"(var_b) // Input

:"r2","r3","r4" // used registers

);

Have a look at http://homepage.fudan.edu.cn/%7eeuler/gcc_asm/inline-1.html (http://homepage.fudan.edu.cn/%7eeuler/gcc_asm/inline-1.html)

Christian

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originally posted by sriram_k+mar 21 2007, 12:13 pm--><div class='quotetop'>quote (sriram_k @ mar 21 2007, 12:13 pm)</div>

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originally posted by christian_80@mar 21 2007, 03:45 am

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originally posted by arrive@mar 20 2007, 04:13 pm

<!--quotebegin-sriram_k@Mar 20 2007, 08:24 AM

hi

i am i am new to nios. i want to insert an asm code in c prog...

in microcontroller prog..... i use# pragma...

this command is not working in nios ide. plz tell me in what way i can insert my

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=22362)

--- quote end ---

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Have a try on the inline asm, which basically enable users to write assembly instructions directly. For example:

 asm ("stw    r0,  16(sp)");

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=22365)</div>

[/b]

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Just a small example:

__asm__ __volatile__("mov r2, %0 \n\t"

"mov r3, %1 \n\t"

"ldw r4, 0(r2) \n\t"

"stw r4, 312(r3) \n\t"

: // No output needed !

:"r"(var_a),"r"(var_b) // Input

:"r2","r3","r4" // used registers

);

Have a look at http://homepage.fudan.edu.cn/%7eeuler/gcc_asm/inline-1.html (http://homepage.fudan.edu.cn/%7eeuler/gcc_asm/inline-1.html)

Christian

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=22369)</div>

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thanks christian...

its working fine.. also i found the link posted in group is very useful.. http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/biggrin.gif

till now i was simulating the code in simulator only....

i had DE2 board...

could u plz.. send me any link regarding the syntax in C code for nios processor to handle the I/O ports and all....

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=22388)</div>

[/b]

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Many information can be found in the Nios2 Software Developer Guide on altera.com

A simple 32bit IO Component can be accessed by:

IORD_32DIRECT(PERIPHERAL_NAME_BASE(defined in the SOPC Builder),OFFSET,VALUE)

IRWR_32DIRECT(PERIPHERAL_NAME_BASE,VALUE)

Christian