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

Nantian Gumo

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 in reply to Jon Ward

    Thanks Jon.
    The puchar() routine doesn't be changed ,I just write a UART INTTERUPT routine for receiving the data from Decode_Card and enable UART Interrupt in Initial().When debugged in UV3,the program output nothing without 

      ES = 0; TI = 1
    ,and the same to running on object_board

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  • 0 in reply to Jon Ward

    Thanks Jon.
    The puchar() routine doesn't be changed ,I just write a UART INTTERUPT routine for receiving the data from Decode_Card and enable UART Interrupt in Initial().When debugged in UV3,the program output nothing without 

      ES = 0; TI = 1
    ,and the same to running on object_board

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