hi all..i need some advices and helps here..
i am using lpc2129 and i can flash the program into the board before
this, but it just all the sudden that my board cannot communicate with
my pc..did anyone has experience like this before?can give me some
suggestions?is it the problems of my pc or the board itself?
i had tried to replace the RS232,MAX232 IC and the serial cable but
the board still cannot communicate with my pc.
i connect the board to my pc using serial cable and lpc2000 Flash Utility.
hope to hear from u guys soon..cause this is kinda emergency..thanks!!
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lpc2129 cannot communicate with pc..
Started by ●March 20, 2008
Reply by ●March 20, 20082008-03-20
--- In l..., "azhong_0810" wrote:
>
> hi all..i need some advices and helps here..
> i am using lpc2129 and i can flash the program into the board before
> this, but it just all the sudden that my board cannot communicate with
> my pc..did anyone has experience like this before?can give me some
> suggestions?is it the problems of my pc or the board itself?
> i had tried to replace the RS232,MAX232 IC and the serial cable but
> the board still cannot communicate with my pc.
>
> i connect the board to my pc using serial cable and lpc2000 Flash
Utility.
> hope to hear from u guys soon..cause this is kinda emergency..thanks!!
>
It's RS232, so it's guaranteed to be a PITA. It's even more complex
than usual if you are using the RS232 control lines to operate the
'P0.14' ISR bootloader start and the processor reset line. You really
need a scope to check what's happening along the chain.
Is the PC operating the control lines correctly?
Are these signals correctly arriving at P0.14 and the reset line?
Is the ISR bootloader issuing its prompt?
Is the PC receiving this prompt?
Is the PC issuing commands to the ISR bootloader?
Are these commands reaching the chip UARTo Rx?
Rgds,
Martin
>
> hi all..i need some advices and helps here..
> i am using lpc2129 and i can flash the program into the board before
> this, but it just all the sudden that my board cannot communicate with
> my pc..did anyone has experience like this before?can give me some
> suggestions?is it the problems of my pc or the board itself?
> i had tried to replace the RS232,MAX232 IC and the serial cable but
> the board still cannot communicate with my pc.
>
> i connect the board to my pc using serial cable and lpc2000 Flash
Utility.
> hope to hear from u guys soon..cause this is kinda emergency..thanks!!
>
It's RS232, so it's guaranteed to be a PITA. It's even more complex
than usual if you are using the RS232 control lines to operate the
'P0.14' ISR bootloader start and the processor reset line. You really
need a scope to check what's happening along the chain.
Is the PC operating the control lines correctly?
Are these signals correctly arriving at P0.14 and the reset line?
Is the ISR bootloader issuing its prompt?
Is the PC receiving this prompt?
Is the PC issuing commands to the ISR bootloader?
Are these commands reaching the chip UARTo Rx?
Rgds,
Martin
