Try this code
LDRH r3, [r4], #2 STRH r3, [r5], #2 LDR r3, [r4], #4 STR r3, [r5], #4
It can build . but cause my mobilphone crash. how to resolve this problem? p.s I want use LDRH and LDR in same memory segment!
Are you sure that the base registers (r4 and r5) point to such addresses that both the halfword and the fullword accesses are on proper address boundaries?
The last two bits of the addresses must be 10 before your code to make it work (i.e. last hex digit is
2, 6, a or e).The memory segment will not affect the addressing here.
-- Tauno Voipio tauno voipio (at) iki fi
hi Tauno: I'm a beginner to learn arm asm, :), I just want use LDR to read two halfword to let my code more effective.but when i have odd halfword , I must use LDRH to read one halfword. can I do this?thanks for help^^
"Tauno Voipio" ??????:c9hie.47$ snipped-for-privacy@read3.>> Try this code
If the data is halfword-aligned, use LDRH/STRH for all the halfwords.
For longer transfers, you may use fullwords, but then you need to first test for odd halfwords and transfer them separately, then move all fullword-aligned halfword pairs and then maybe the last halfword if there are not even pairs to transfer.
HTH
-- Tauno Voipio tauno voipio (at) iki fi
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