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software UART

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hi, i've a pc connected to a microcontroller , and this micro is connected to another micro in which is connected to another PC .
i wanna send a msg from the 1st pc and be transmitted to the another pc .

im using 89C52 which have only 1 UART, and im using Keil C51...
i've managed to transmit and recieve bytes from pc to the micro but from micro to micro i couldnt do that , i've googled and didnt find what i need ..

i tried also extract the byte's bits and send the bits bit by bit by a delay but there were a problem in synchronization .. and also couldnt determine the baud rate ...

thanks ..
 
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