Lpc2000

Hi Shannon.

Thanks for your reply !

I dont think I'll use the CP2101's control pins
(you'd probertly never know if an interfacing application would drive them)
:)

But many thanks for the suggestion !

Regards
Lasse

-----Oprindelig meddelelse-----
Fra: Shannon Holland [mailto:holland@...]
Sendt: 1. juli 2004 17:40
Til: lpc2000@yahoogroups.com
Emne: Re: [lpc2000] Flash access & bootloader question ?



On Jul 1, 2004, at 2:04 AM, Lasse Madsen wrote:

> The Bootloader uses UART without the modem interface, can i connect
> this
> uart to a Cygnal CP2101 seriel to USB converter
> (this device only has a 512 byte buffer as far as i remember so what i
> dont
> know is if the bootloader waits for some
> character and then resumes operation like XON/XOFF sw flow control or
> if it
> just bursts all the data out ?)
>

I think if you read the flash section of the user manual you will find
the answers to your questions. There is a response from the bootloader
for each section of flash image you download so flow control should not
be a problem. To get into bootloader mode though you need to hold P0.14
low at reset. So you either need GPIO and serial from your usb->serial
converter or have some other way to hold that line low.

If you can drive some of the modem control lines on the CP2101 then you
could have it manage reset and P0.14.

Shannon





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