Lpc2000

--- In lpc2000@yahoogroups.com, Stanley Frederickson <robostanley@...>
wrote:
>
> I suspect that if you add a NOP after the LDMIA
> instruction so that the LDMIA is in the decode stage
> before  you kick off the restart then you will get the
> expected results.
> 
> It appears that the core isn't going back up to full
> speed and when you think you are reading out the value
> of the registers with a STM instruction, you are
> actually getting your NOPs (the 0xE1A00000 values in
> R1-R8 are the MOV R0,R0 instruction) thrown back at
> you.  You probably aren't clocking out the registers
> from the STM instruction but instead you are clocking
> in the data for the LDMIA so the NOPs are staying on
> the data bus when you come back around to read them
> since the core thinks it is reading from the data bus
> and not writing to it.
> 
> Shouldn't you be expecting 0xa0000020 back in R0 and
> not 0x40000020?

I made mistake. In my last message should be 
"Put in R0 Addr = 0x40000000  (R0 writing OK)"
so I expecting 0x40000020 back in R0.

I add NOP after LDMIA and now I get:

R0: 0x40000020
R1: NOP
R2-R8: correct values of RAM from address 0x40000004.

In R0 is NOP but should be value of RAM from address 0x40000000.

Reading of registers is OK becouse I always get this same values.

Thanks and regards