I was wondering if anybody ever had interfaced a Mega128 to the USB port of a PC?
Does anybody know anything on that topic? Please enlighten me with links, hints or whatever you see fit.
Morten W. J.
Search this Forum for recent discussions on the topic. FTDI seems to be the concensus answer for ease of implementation.
You can put lipstick on a pig, but it is still a pig.
I've never met a pig I didn't like, as long as you have some salt and pepper.
FTDI, a Scottisch company, offers several chips for USB conversion, either from/to serial or parallel.
I use the FTDI232 or so (can't remember exact name), which converts a UART (or a full blown RS232 port) to USB, and provides together with their driver software a virtual COM port on your PC. You don't need an RS232 interface circuit though, it directly takes the logic levels of the uC
the FTDI chip has 0-4.5V logic, whereas your uC probably runs on 3V logic. So a level-converting buffer is needed in addition to the example circuit of FTDI!
Other than this, I have good experience with the chip and software.
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The "B" version of the FTDI chips actually allows you to interface to any logic level, 3.3 OR 5v. There is a "VCCIO" pin that, if you tie it to 3.3v, the interface is 3.3v logic compatible. If you tie it to 5v, then - you guessed it - you can interface to 5v..
i use the FT8U232AM from FTDI Chip too.
I 'd like to buy one of this circuit (looks very interesting) FT245, I live in France, were can I buy only a few pieces for my own projects.
i come from germany, and i have buyed the FTDI Chips from the "UNTRONIC AG" in germany.
Please write an email and ask for an presentation of price at: Sonja.Sassmannshausen@Unitronic.de .
Can you please inform us, when you have found an seller ? (i only asked about the FT8U232AM, but they have them all ...)
i am from china,you may choose at43usb355,that is ery good.
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