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Forum Index : Microcontroller and PC projects : 480 kb baudrate with ...?

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plasma
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Joined: 08/04/2012
Location: Germany
Posts: 437

Posted: 01:53am 10 Jul 2015

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Hi ,

I know mmbasic cant handle 480 kb with serial baudrate
but i like to know what chip can handle this baudrate ?
Pc serial has also a slow serial in my case.

Mfg

robert.rozee
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Joined: 31/12/2012
Location: New Zealand
Posts: 2437

Posted: 02:07am 10 Jul 2015

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i'm running an arduino nano at 500,000 baud, and had no problems even at 1,000,000 baud - meaning that an atmel ATmega328p is ok at these speeds.

at these high baud rates it can help to select a baud rate that is a multiple of the system clock. for instance, while a nano worked fine at 500,000 baud, it failed to communicate at 460,800 baud. the nano's clock is 16MHz. in the same vein, if the device you are talking to supports it, you may like to try the micromite at 500,000 baud.

cheers,
rob :-)

addendum: if one end of your serial link is through a USB to serial bridge, you will strike an issue that USB is limited to 1000 "transactions" per second, where the size of each transaction can be small (only 1 character) or big (10,000 or more characters). so to achieve good throughput you do need to be sending data from your PC in relatively large chunks, not one character at a time.Edited by robert.rozee 2015-07-11

Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9593

Posted: 02:12am 10 Jul 2015

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The new MM+ beast can support up to 1Mb on all four serial ports via MMBASIC.

From manual for new MM+ page 71:

Quote
On the Micromite Plus all serial ports are capable of high speed (> 1Mbaud/sec). The maximum baud rate at any clock speed is practically limited by crosstalk and the capacitance of the wiring.

Smoke makes things work. When the smoke gets out, it stops!

plasma
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Joined: 08/04/2012
Location: Germany
Posts: 437

Posted: 02:54am 10 Jul 2015

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Great Info , thx

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