Serial Interface Program Needed

[ahm_hassaan]

Dear All,
I use ATMEGA162 in my project I already use the 2 USART interface embedded into the ATMega162.
Now i need to use another USART by using the ordinary GIOs ports, so i need to made it by software.
Plz help me with accurate S/W for serial interface using ordinary ports.

 

[budhy]

Full duplex SW UART

This is an implementation of a full duplex software UART

It uses one 8 bit TC, can share it when not active, and 6 bytes of memory, it can simply be ported to any AVR.

better AVR305 based UART

Since people looking at this are looking for a UART, heres one based on AVR305 that I ported to WINAVR. Its VERY cross-part-friendly, and VERY quick. 19200 is reliable on the Tiny15, with 38400 being sketchy, but usable (I think my clock isnt quite cali