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Author Topic: Get "standard" serial port  (Read 2539 times)
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Jeckson
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« on: August 02, 2010, 11:01:00 11:01 »

Hai
Great All

I found http://www.recursion.jp/avrcdc/cdc-232.html very usefull for usb to ttl converter with attniy45.
Unfortunedly the speed only <4800bps.
I'm sticky to attiny45 cause the size.
Any information on how to modified it to get "standard" 9600 bps?

Thank's
Jeckson
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kayvee
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« Reply #1 on: August 02, 2010, 11:54:11 11:54 »

It is most likely the limited processing power of the AT device that restricts the throughput to 4800bps.

It you want something far more flexible you need to look at something like the FTDI or Silicon Labs CP210x series, which are also available in small packages if you are space constrained.
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Jeckson
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« Reply #2 on: August 03, 2010, 09:44:32 09:44 »

Thank you very much

It is most likely the limited processing power of the AT device that restricts the throughput to 4800bps.

It you want something far more flexible you need to look at something like the FTDI or Silicon Labs CP210x series, which are also available in small packages if you are space constrained.


I'm sticky to attiny45 cause the size.
Any information on how to modified it to get "standard" 9600 bps?

Thank's
Jeckson

FTDI chip very hard to get part in my country.(must be on-line puchased)

Any possibility to get standard serial "9600 bps"? How's about added crystal oscillator like:
http://www.harbaum.org/till/i2c_tiny_usb/index.shtml

perhaps fixed baud rate at rate 9600bps??

Regards
Jeckson
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pickit2
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« Reply #3 on: August 03, 2010, 12:31:57 12:31 »

Quote
ATtiny45/85 uses internal RC oscillator and PLL. It is calibrated by  USB signal when connected. UART is implemented by software. It is not enough for high speed data transfer
so you need to look at firmware or other device your link http://www.harbaum.org/till/i2c_tiny_usb/index.shtml may have answer. on ebay you can see usb to serial converters http://cgi.ebay.co.uk/USB-RS232-Serial-9Pin-Cable-Adapter-PDA-GPS-/390099866255?cmd=ViewItem&pt=UK_Computing_CablesConnectors_RL&hash=item5ad3c3928f at a local phone shop I bought one for 1, owner had bought 10 from china.
« Last Edit: August 03, 2010, 12:35:24 12:35 by pickit2 » Logged

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Jeckson
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« Reply #4 on: August 10, 2010, 12:01:31 12:01 »

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Thank's...Could I purchased in 1000 pieces from China?

Quote
at a local phone shop I bought one for 1

At my local shop gave me 7 US$.

Thank you
Jeckson
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Jeckson
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« Reply #5 on: August 10, 2010, 02:38:59 14:38 »

I just investigated at local PC and Computer shop..

They gave me at 13US$...ALAS.

Jeckson
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technovm
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« Reply #6 on: October 27, 2010, 10:29:31 10:29 »

You can try USB to Serial converters by Bafo: www.bafo.com
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