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0x3FFFC018

I am trying to write some words starting from 0x3FFFC000 to 0x3FFFC018. I am able to write to all locations except 0x3FFFC018.

Keil uvision4, ARM7

AREA  sevensegment, CODE, READONLY

                LDR r1,=space
                LDR r0,=0x3FFFC000
                MOV r3,#0
next    LDR r2,[r1]
                STR r2,[r0],#4
                ADD r3,r3,#1
                CMP r3,#7
                BNE next

exit    b exit
space   DCD   0x20202020
                END

Parents

0 John Linq over 10 years ago in reply to Westonsupermare Pier

A quick search gives me this:

http://www.keil.com/dd/docs/arm/philips/lpc214x.h

#define FIO0DIR         (*((volatile unsigned long *) 0x3FFFC000))
#define FIO0MASK        (*((volatile unsigned long *) 0x3FFFC010))
#define FIO0PIN         (*((volatile unsigned long *) 0x3FFFC014))
#define FIO0SET         (*((volatile unsigned long *) 0x3FFFC018))

Reply

0 John Linq over 10 years ago in reply to Westonsupermare Pier

A quick search gives me this:

http://www.keil.com/dd/docs/arm/philips/lpc214x.h

#define FIO0DIR         (*((volatile unsigned long *) 0x3FFFC000))
#define FIO0MASK        (*((volatile unsigned long *) 0x3FFFC010))
#define FIO0PIN         (*((volatile unsigned long *) 0x3FFFC014))
#define FIO0SET         (*((volatile unsigned long *) 0x3FFFC018))

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