why doesnt this code work on my AT91RM9200 (newbie)
From: funkymunky (prehistorictoad2k_at_yahoo.com)
Date: 12/31/04
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Date: 31 Dec 2004 04:16:10 -0800
Hi,
Im an undergrad student, and a newbioe to the ARM. Im working on a
board based on the AT91RM9200 uC. Im relying on the default boot
program, and im using the xmodem protocol to load the foll. program
thru hyperterminal. Im just sending a nibble to the I/O pins, expecting
to verify the effect with a multimeter. but this isnt working:
#include <stdio.h>
int main()
{
__asm
{
start:MOV r1, #0xFFFFF800 //PIO C
MOV r0,#0xF //only the last 4 pins needed
STR r0, [r1] //send to PIO_PER
MOV r0, #0
STR r0, [r1, #0x4] //send to PIO_PDR
MOV r0, #0xF //output enabled on last 4 pins
STR r0, [r1, #0x10]//send to PIO_OER
MOV r0, #0
STR r0, [r1, #0x14] //send to PIO_ODR
MOV r0, #0xF //sync output on last 4 pins
STR r0, [r1, #0xA0] //send to PIO_OWER
MOV r0, #0
STR r0, [r1, #0xA4] //send to PIO_OWDR
MOV r0, #0xA
STR r0, [r1, #0x38] //send this to the pins
loop: B loop //infinite loop
}
}
after this ->
armcc -c test.c
armlink test.o -o test.axf
fromelf test.axf -bin -o test.bin
then i load this bin file onto the controller. But nothing
happens..whats going on :-(
thanx in anticipation
Mayank
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