8051 serial port interrupt for half duplex operation

[mesamune80]

Hi, everyone i wonder how am i going to do a multiprocessor half duplex.operation with 8051 using C to write it.i want to send 5 bytes to another micro(B) then it will send back to me 5 bytes,to indicate that it received the previous 5 bytes from the 1st micro,i need a switch for the micro(A) to start transmit the 5 bytes,and when miro(A) received the 5 bytes that send by micro(B) then a LED will flash ON.Anybody has any idea how to accomplish this task?Thanks for your help i really appriciate it.
and i need to check whether the bytes send are correct or not let say i want 1,2,3,4,5
i have to ensure that 1,2,3,4,5 are transmitted.

 

[bmcculla]

Just use the UART. Its a full duplex serial interface using 2 wires. Just connect the TX on one controller to RX on the other. You might have to invert the bytes you recieve

 

[mesamune80]

Yes,thanks for ur information ,but do u know how to write this program using C instead of ASM ?

 

[bmcculla]

__bit RecievedFlag = 0;
__bit BusyFlag = 0;
unsigned char SerialData;

while(1)
{
   if (RI) 
   {
       RI = 0;
       SerialData = SBUF;
       RecievedFlag = 1;
   }
   if (RecievedFlag & (!BusyFlag))
   {
       SBUF = SerialData;
       BusyFlag = 1;
    }
   if (TI)
   {
       TI = 0;
       BusyFlag = 0;
      ReceivedFlag = 0;
   }
}

I heven't tested this code - i don't have any code on hand that just reads the UART so I just slapped this together. This code gives the general idea for reading and writing the UART. The code as is should echo characters received from the UART.

 

[mesamune80]

Thanks for the codes that u had posted!!! Now i may have some idea how to do it ^^
Thanks for Bmcccula!!