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Selectable UART stream????

 
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Jason1980
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Selectable UART stream????
PostPosted: Mon Feb 25, 2008 2:07 pm     Reply with quote
I am using two UARTs in my application. Is there a way to be able to select between two rs232 streams without having to write another fprintf statement that does the same thing?

For example if my variable PORT=1 then I want to send the data out the first UART. If my variable PORT=2 then send data out the second UART

fprintf(PORT,"%d\r",data);


the compiler complains that the stream must be a constant. I'm just wondering if there is a way around this.

thanks
KD5UZZ_
Guest
Switch
PostPosted: Tue Feb 26, 2008 3:31 pm     Reply with quote
Code:

#use rs232(STREAM=PORT1,xmit=C6,rcv=C7,errors)
#use rs232(STREAM=PORT2,xmit=B2,rcv=B4)

int Port = 1;

switch (Port){
    case 1:
        printf(PORT1,"Blah blah blah");
        break;
    case 2:
        printf(PORT2,"Thing to print");
}



I doubt the #use rs232 lines are valid, but the rest of the code should work.
arunb



Joined: 08 Sep 2003
Posts: 492
Location: India

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RE:
PostPosted: Sat Mar 01, 2008 4:41 am     Reply with quote
Hi,

The format for selecting from multiple streams is like this

Code:

#use rs232(STREAM=PORT1,xmit=C6,rcv=C7,errors)
void xmit_port1()
{
  printf("Blah blah blah");
}

//For the second stream...

#use rs232(STREAM=PORT2,xmit=C6,rcv=C7,errors)
void xmit_port2()
{
  printf("Thing to print");
}



thanks
arunb
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