RTI on SH08 problem

Cram — Mon, 31 May 2010 17:41:24 GMT

Hi all,

I want to create a 256mS delay using the RTI modulo on a SH08, I don't eant an interrupt so I'll use pollins software solution.

I used the RTI modulo before but never get this error:

Error: At location FFCC -
Error: Attempt to use invalid or uninitialized memory

Error: Interrupt processing failed.
HALTED

The message apperas only when the RTICNT reaches the RTIMOd value and the RTFI flag should be set, If I disable the general interrupts I don't have the error.

Can anybody help me? Thxs in advance.

Re: RTI on SH08 problem

Cram — Tue, 01 Jun 2010 22:58:37 GMT

Hi all,

I used the MTIM modulo to generate de delay time, and today I checked again with the RTI modulo, and everything is working fine.

Re: RTI on SH08 problem

i_kauf — Thu, 03 Jun 2010 12:21:59 GMT

Hello Cram!

I do not understand C Language cause I write my programs in assembly language.

It seems to me that you dont initialize the Interrupt Vectors.

Try to initialize the interrupt Vector Table from 0xFFFE - 0xFFC0. In assembly language that should look like this:

RTC_ISR:

RTI

Vectorstart: EQU $FFC0

;**************************************************************
;* Interrupt Vectors for MC9S08SH8 *
;**************************************************************
ORG Vectorstart

           DC.W spurious          ; 31 unuset/future used
            DC.W spurious          ; 30 Vacamp
            DC.W spurious          ; 29 unuset/future used
            DC.W spurious          ; 28 unuset/future used
            DC.W spurious          ; 27 unuset/future used
            DC.W spurious          ; 26 Vmtim
            DC.W  RTC_ISR          ; 25 Vrtc
            DC.W spurious          ; 24 Viic
            DC.W spurious          ; 23 Vadc
            DC.W spurious          ; 22 unuset/future used
            DC.W spurious          ; 21 Vportb
            DC.W spurious          ; 20 Vporta
            DC.W spurious          ; 19 unuset/future used
            DC.W spurious          ; 18 Vscitx
            DC.W  spurious         ; 17 Vscirx
            DC.W spurious          ; 16 Vscierr
            DC.W spurious          ; 15 Vspi
            DC.W spurious          ; 14 Vtpm2ovf
            DC.W spurious          ; 13 Vtpm2ch1
            DC.W spurious          ; 12 Vtpm2ch0
            DC.W spurious          ; 11 Vtpm1ovf
            DC.W spurious          ; 10 unuset/future used
            DC.W spurious          ; 9   unuset/future used
            DC.W spurious          ; 8   unuset/future used
            DC.W spurious          ; 7   unuset/future used
            DC.W spurious          ; 6   Vtpm1ch1
            DC.W spurious          ; 5   Vtpm1ch0
            DC.W spurious          ; 4   unuset/future used
            DC.W spurious          ; 3   Vlvd
            DC.W spurious          ; 2   Virq
            DC.W spurious          ; 1   SWI
            DC.W _Startup          ; 0   Reset

Regards,

Ingo

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