AW: [En-Nut-Discussion] ASM Branch

[Ernst Stippl]

Hi Tim!

The "BX" instruction jumps to an address hold in a register (which the
instructions operand), and may optionally switch to Thumb mode.

The "B" instruction jumps to an address hold in the instruction itself. I
think thats what you need.

regards
ernst

-----Ursprüngliche Nachricht-----
Von: en-nut-discussion-bounces at egnite.de
[mailto:en-nut-discussion-bounces at egnite.de] Im Auftrag von Tim DeBaillie
Gesendet: Donnerstag, 02. November 2006 00:35
An: en-nut-discussion at egnite.de
Betreff: [En-Nut-Discussion] ASM Branch


I am working on the ethernut 4.2 ethernet based bootloader for the
AT91SAM7X256.  I have code at a particular location (0x10100) in flash and
would like to "jump" to it.  I believe the right command is:

asm volatile ("bx #0x10100");

But this doesn't work.  I believe this may have something to do with R15 in
the microcontroller (the program counter), but I am unsure.

Does anyone want to lend a hand with this arm instruction set?

Tim
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