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Topic: Special Serial Port 250Kbaud at 128bit length (Read 683 times) previous topic - next topic


i got a specialize product that work in a serial fashion,
no start bit, 128 bit of data and no stop bit.
There is a trigger input and after that the device send me 128 bit in a stream at 240K baud exactly 4 microsecond per bit.

I cannot use the Asynchronous serial port because, it can probably only be program for 5 6 7 or 8 bit
any idea how i should do this?
Thanks for your help


Seeing as 128 bits is equivalent to 16 8-bit bytes, there's nothing stopping you from just reading the data with the UART.


Dec 03, 2011, 04:15 am Last Edit: Dec 03, 2011, 04:27 am by Graynomad Reason: 1
Can't use a UART, it will strip start and stop bits.

I think you'll have to bit bang your own serial.

How to you know when the data stream starts? Is the first byte a known value or something?

EDIT: "There is a trigger input", just reread that.

The algorithm is simple enough but maintaining sync over 128 bits might need some work. You may have to resync on edges.

Rob Gray aka the GRAYnomad www.robgray.com

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