Lpc2000

I have had a multitude of connection problems with newer IAR Kickstart
boards.  The connection is lost requiring a power cycle.  I have also
noticed that I have had ZERO problems with the older IAR Kickstart
board.  The older boards were four layer, the newer two.  The older
board uses a different RS232 driver than the new.  I have replaced the
driver (ST) on the new board with a Maxim device and ALL my connection
problems have gone away.  

FYI

(Your mileage may vary)

Richard

--- In lpc2000@yahoogroups.com, "Richard" <richas@y...> wrote:
> 
> I have had a multitude of connection problems with newer IAR 
Kickstart
> boards.  The connection is lost requiring a power cycle.  I have 
also
> noticed that I have had ZERO problems with the older IAR Kickstart
> board.  The older boards were four layer, the newer two.  The older
> board uses a different RS232 driver than the new.  I have replaced 
the
> driver (ST) on the new board with a Maxim device and ALL my 
connection
> problems have gone away.  

Hi,

can you be more specific - what connection problems you have had with 
Kickstart boards?
What baudrate? etc?

Tsvetan
---
PCB prototypes for $26 at http://run.to/pcb
(http://www.olimex.com/pcb)
PCB any volume assembly (http://www.olimex.com/pcb/protoa.html)
Development boards for ARM, AVR, PIC, and MSP430
(http://www.olimex.com/dev)

The connection would time out on all operations besides read part ID
at all baud rates.  Swapping out the driver fixed all problems.  This
scenario repeated itself on two different boards.

Richard

-- In lpc2000@yahoogroups.com, "tsvetanusunov" <tusunov@m...> wrote:

> 
> --- In lpc2000@yahoogroups.com, "Richard" <richas@y...> wrote:
> > 
> > I have had a multitude of connection problems with newer IAR 
> Kickstart
> > boards.  The connection is lost requiring a power cycle.  I have 
> also
> > noticed that I have had ZERO problems with the older IAR Kickstart
> > board.  The older boards were four layer, the newer two.  The older
> > board uses a different RS232 driver than the new.  I have replaced 
> the
> > driver (ST) on the new board with a Maxim device and ALL my 
> connection
> > problems have gone away.  
> 
> Hi,
> 
> can you be more specific - what connection problems you have had with 
> Kickstart boards?
> What baudrate? etc?
> 
> Tsvetan
> ---
> PCB prototypes for $26 at http://run.to/pcb
> (http://www.olimex.com/pcb)
> PCB any volume assembly (http://www.olimex.com/pcb/protoa.html)
> Development boards for ARM, AVR, PIC, and MSP430
> (http://www.olimex.com/dev)

Hi,

Tools used:
GNU gdb 5.3 (insight)
LPC2106 board running ARM remote GDB stubs (over UART)

Short description:
When I try to set a breakpoint at a thumb C-function
starting at address 0x40000278, GDB debugger (insight)
sends a (GDB protocol) command to write 0xbebe
(Instruction which would generate a Undef exception)
at 0x40000282 & not at 0x40000278. Which is actually
the function\ufffds exit & not the entry.

Detailed description:
I issue the following commands on the GDB\ufffds console

$ target /dev/com1
$ load
$ b APP_vMain
$ c

And GDB log file reads as follows <Just the important
lines are included here>:

c b APP_vMain 
w $m40000278,2#60
r +$00b5#f7
w +$m4000027a,2#89
r +$0248#ce
w +$m4000027c,2#8b
r +$00f0#f6
w +$m4000027e,2#8d
r +$02fb#2a
w +$m40000280,2#59
r +$01bc#26
w +
c c
w $Z0,40000282,2#a4
r +$#00
w +$m40000282,2#5b
r +$0047#cb
w +$M40000282,2:bebe#03
r +$OK#9a
w +$Hc0#db


Clipping from the image disassembly around APP_vMain()
function:

40000274:	4000fc00 	andmi	pc, r0, r0, lsl #24

40000278 <APP_vMain>:
40000278:	b500      	push	{lr}
4000027a:	4802      	ldr	r0, [pc, #8]	(40000284
<.text+0x184>)
4000027c:	fb02f000 	bl	40000884 <CONSOL_SendString>
40000280:	bc01      	pop	{r0}
40000282:	4700      	bx	r0
40000284:	0ff0      	lsr	r0, r6, #31
40000286:	4000      	and	r0, r0

GDB reads the 1st 5 instructions staring 0x40000274
(APP_vMain) & finally sets the Break (Undef)
instruction at the 6th instruction. Why?

Please help me understand the issue behind this.

Thanks,
-Mike.


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com