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sending data to serial port

maria

I am interfacing an led with via serial port. I have set up the serial port already.

I have a display with these specification parameters: baudrate:2400 data:8 bits end code:1bit

I am trying to display the test code which comes in the following format:
"10"+"01H"+"0FFH"

I tried printf but didn't work:
printf("10"+"0x01"+"0x0FF");
Any suggestions??

10x