AVR-Chat

Hi,

We had a similar requirement where we need the ATMEga128 to have a total of 6 UARTS.

Unless your speed requirements are very low, and your processor requirements outside of your software UARTS is not very high, I would recommend that you go for a hardware option, otherwise you may spent a lot of processor time on watching you software serial UARTS.

We have chosen the Oxford Semiconductor (http://www.oxsemi.co.uk/pages/uarts/index.html ) OX16C954 chip as it also has 128 byte transmit and 128 byte receive buffers per UART, does RS485 half and full duplex, full hardware RS232, IrDA, and much more. The chip is roughly the same size as ATMega128. (I have absolutely NO connection with that company)

We will be releasing the hardware and software under GPL for the Ethernut processor (refer to www.ethernut.de ) in the next month or so.

You may well be able to graft the hardware onto your design.

Cheers Douglas

We have to implement 6 serial connections to 6 modules from each
module. we are going to use the atmega128 on each module.

The atmega128 has 2 uarts so i can implement 2 simultaneous uarts.
It is preferable not to have any external components (we have to keep
footprint small) , so i want to do everything with the atmega128.

-- But what abt the other 4. Will I have to bit bang the rest of the
4 using a software routine uart?

-- Any other interesting solution which will allow me to use timers
or something so that the cpu doesnt have to be busy doing the serial
commn

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