topic Re: LPC1549 ISP Supported Baud Rates in LPC Microcontrollers

LPC1549 ISP Supported Baud Rates

mikepage — Fri, 11 Jun 2021 08:20:54 GMT

Morning All,

We've been struggling to get reliable autobauding on LPC1549 for some months now. I know autobauding is a minefield and that matches the effort we've put into addressing the problem. But I have a simple question:

What baud rate(s) should we be able to use reliably?

Cheers,

Mike.

Re: LPC1549 ISP Supported Baud Rates

Alice_Yang — Fri, 11 Jun 2021 09:56:24 GMT

Hello mikepage,

How about 115200 ?

Re: LPC1549 ISP Supported Baud Rates

mikepage — Sat, 12 Jun 2021 13:27:59 GMT

Hi Alice, that would be great. I find 115200 works most of the time with other LPC parts (LPC2364, LPC1763, LPC824, LPC845, LPC1788) but with the LPC1549 it's failing to autobaud about half the time and my client is having to use 19200 or even 9600 for reliability.

But I think you've answered my question - thanks! 115200 should be achieveable. I'll kick this back to the hardware engineers.

Re: LPC1549 ISP Supported Baud Rates

mikepage — Thu, 01 Jul 2021 09:51:10 GMT

Update: we have found slow edges could negatively affect autobauding.

But the problem remains, with many theories being suggested. We are close to giving up on ISP.