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Immediate offset problem with the LDR commands

Bulent Unalmis

Compiler give error message for following codes.
A1174E: "Data transfer offset 0x00000102 out of range. Permitted values are 0x00..0x1F"

    LDR   R1,=USB_BASE
    LDRB  R0,[R1,#USB0_CSRL0] ; Error code is A1174E !!!!

USB_BASE   EQU 0x40050000
USB0_CSRL0 EQU 0x102

But compiler dont give any error if i write this program thats way

USB_BASE   EQU 0x40050000
USB0_CSRL0 EQU 0x102

    LDR   R1,=USB_BASE
    LDRB  R0,[R1,#USB0_CSRL0] ; Error code is A1174E !!!!

What is wrong?

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  • 0 in reply to Patrick Noonan

    Yes, but the OP is convinced that we still haven't even understood his problem, so why would he assume that any of our comments may be related to the problem?

    Continuing on Andys track: a C programmer would have managed to implement quite a lot of real functionality by now since the C compiler condenses quite a lot of experience and documentation into a readily available digital servant.

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  • 0 in reply to Patrick Noonan

    Yes, but the OP is convinced that we still haven't even understood his problem, so why would he assume that any of our comments may be related to the problem?

    Continuing on Andys track: a C programmer would have managed to implement quite a lot of real functionality by now since the C compiler condenses quite a lot of experience and documentation into a readily available digital servant.

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