topic _asm directive in KDS in Kinetis Design Studio

_asm directive in KDS

frankbannon — Mon, 09 Mar 2015 13:14:43 GMT

Hi everyone,

I am a noob with KDS and Kinetis MCU's.

I imported "hello world" examples for the FRDMKL26Z board and I am compiling. I get a build error with the auto generated "Statup.c" code. The complier is expecting an add'l "(" in the ASM directive, see below.

It appears that the statup.c code was imported from Keil and not specific to KDS and KDS doesn't like the syntax. Any thoughts?

__asm void __thumb_startup(void)

{

IMPORT __init_hardware

IMPORT __main

LDR R0, =__init_hardware

BLX R0

LDR R0, =__main

BX R0

ALIGN 4

}

Re: _asm directive in KDS

ivadorazinova — Mon, 09 Mar 2015 15:31:53 GMT

Hi Frank Bannon,

please, where you get the example Hello World for KL26Z?

Do you work with KSDK V1.1 ?

Best Regards,

Iva

Re: _asm directive in KDS

ZhangJennie — Tue, 10 Mar 2015 10:19:37 GMT

Hi Frank,

the syntax is for ARM C compiler.

__asm void __thumb_startup(void)

{ <assembly code>}

if use GNU C compiler, use this syntax, for example:

__asm (

"mov r0,%0\n\t"

"cmp r0,#0\n\t"

"beq skip_sp\n\t"

"mov sp,r0\n\t"

"sub sp,#4\n\t"

"mov r0,#0\n\t"

"mvn r0,r0\n\t"

"str r0,[sp,#0]\n\t"

"add sp,#4\n\t"

"skip_sp:\n\t"

::"r"(addr));

Have a great day,
Zhang Jun

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Re: _asm directive in KDS

frankbannon — Wed, 11 Mar 2015 01:15:20 GMT

Iva,

I am using KDS2.0

I got the example code from the FRDMKL26 sample code. It is a CW project.

Frank