Re: LPC2000 UART drops characters silently?

Started by Leon Heller July 19, 2006
----- Original Message -----
From: "brendanmurphy37"
To:
Sent: Wednesday, July 19, 2006 11:28 AM
Subject: [lpc2000] Re: LPC2000 UART drops characters silently?
> --- In l..., "John Heenan" wrote:
>>
>> Thanks for sharing your results with us Brendan. Looks like we have
>> had another time wasting false alarm. I don't imagine you will
>> receive an apology or acknowledgment from Jaya, who appears to
> regard
>> anyone who does not engage in reckless opininated criticism of
>> Philips as having the habits of animals.
>>
>> There was another false alarm over the UARTs and 'spurious
>> interrupts'.
>>
>> A certain amount of care, attention to detail and lack of arrogance
>> towards Philips for enhancing their peripherals with useful
>> functionality would help.
>>
>> From what I can remember about the UART, it simply cannot be
> treated
>> with the same reckless abandon as with other microcontrollers.
>>
>> John Heenan
>> Thanks for your acknowledgement - at least someone read the report!
>
> I wouldn't be too hard on Jaya. I for one have learned two things:
>
> 1. LPC21xx UART seems to require 2 stop bits on the receive side.
> Although this is what I'd always assumed, apparently this isn't
> always the case with UARTs. I'd agree that the alternative (of
> being "one-stop-bit tolerant" on the receive side) would be a better
> approach. I've no idea how common this is though in UART designs.
> Some more information would be useful here.

I can't say I've ever used 2 stop bits with any MCU UART, although I
generally have most data going the other way into the PC with the
applications I've worked on, using standard 8n1 settings at both ends.

Leon

An Engineer's Guide to the LPC2100 Series