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Some matter with my "printf()",what can i do ?

When program running to "printf()",the PC always stop at

C:0X0A2A 3099FD JNB TI(0X98.1),C:0A2A

I try adding some word as following :

ES = 0;   //UART INT is Enable before
TI = 1;
printf("%bd",3);
ES = 1;

So , the program running well.Can you tell why being disable UARTs'INT and Setting TI are necessary? How can i overleap this word ?

Another question,why "printf("%bd",3);" can send unsigned char variable to PC right while "printf("%c",3);" not ? What's different between %bd and %c?

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0 Jon Ward over 20 years ago in reply to Nantian Gumo

The program outputs nothing because the interrupt is getting triggered each time TI is set. You can't mix polled and interrupt-driven serial I/O on an 8051.

Jon
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0 Jon Ward over 20 years ago in reply to Nantian Gumo

The program outputs nothing because the interrupt is getting triggered each time TI is set. You can't mix polled and interrupt-driven serial I/O on an 8051.

Jon
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0 Nantian Gumo over 20 years ago in reply to Jon Ward

Catch your words,if enable UART-Interrupt then can't use printf() to poll flag's bit .Can you give me some example about sending data from 8051 with UART Interrupt routine?
Thanks.
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