topic Re: FCS, failure to step in CodeWarrior for MCU

FCS, failure to step

Matt1of3 — Fri, 04 Nov 2011 05:17:45 GMT

Hi All

I have 2 questions, I'm using Codewarrior 10.0, mcs08ac16 controller

1) The PEmicro drop down menu on the tool bar is turned off, how do I turn it on?

2) I’m having difficulty with the Full Chip Simulator when using the BCLR instruction. If I try to set a bit in RAM (first page) it will not work, I get a “Target request failed: Failed to step" error. I also have problems with the Assembler at the same instruction:

BCLR 1,$71 will assemble but will not step

BCLR 1,0x71 will not assemble, I get and “End of line expected “ error A2400

BCLR 1,113 will assemble but will not step.

When I’m using the BDM the code will run although I get a warning on the BCLR Instructions. If it Assembles the disassembly looks good to me.

Is there a way I can get the simulator to accept bit instructions to low RAM?

Thanks and regards,

Re: FCS, failure to step

bigmac — Fri, 04 Nov 2011 14:58:40 GMT

Hello,

Matt1of3 wrote:
2) I’m having difficulty with the Full Chip Simulator when using the BCLR instruction. If I try to set a bit in RAM (first page) it will not work, I get a “Target request failed: Failed to step" error. I also have problems with the Assembler at the same instruction:

BCLR 1,$71 will assemble but will not step
BCLR 1,0x71 will not assemble, I get and “End of line expected “ error A2400
BCLR 1,113 will assemble but will not step.

I assume that you have a .asm file, and you are not using HLI assembler within a .c file. For a .asm file, the representation of a hexadecimal number uses the $ prefix only.

The FCS objects to reading "uninitialised" memory locations, even though the MCU itself would actually return the value containing the "garbage" bits. The BCLR instruction is actually a read-modify-write type, where the whole byte value is read. If this be the issue, simply initialise the memory location with MOV #0,$71 during the POR initialisation process to ensure that all bits are initialised.

Regards,

Mac

Re: FCS, failure to step

Matt1of3 — Fri, 04 Nov 2011 21:45:53 GMT

Thank Mac, Spot On! We usually initialize flags with the bit instructions, I wouldn’t have figured this out.