printf does not work

[ashrafkhatri]

Below is my code. My code work fine and print "Pic controller" on serial port on portb pin4 interupt. But when i add serial interupt #INT_RDA, printf stop printing on portb pin4 interupt.
I want to know why.
Can any one explain the problem, why serial port interupt stop sending data on serial pin on portb interupt

[Matro]

Try :

[ashrafkhatri]

then how can i print on serial pin , while pressing portb pin4. and also include #int_RDA in my code as wel for recieving data

[Matro]

The best is to only set a flag in the #INT_RB ISR.
In your main() endless loop you check this flag. And if it is set you process the data (printf(), ...) and finally clear the flag.

Matro

[ashrafkhatri]

Thanks for your replying

Do you mean i use
#int_rb noclear in my code

how can i set flags and reset it in main loop in C language
could you post a sample code for my better understanding

[Douglas Kennedy]

In your interrupt isr set a global flag myisr_got_achar=true declare it as global (Ex int8 myglobal_flag int8 myisr_got_achar) to indicate a specific condition as having occured ( Ex interrupt so a keypress or interrupt received a char) . In the main code initialize the global Ex flag myisr_got_achar=false and and in the main loop check to see if it was set by the isr if so do the appropriate action in the main routine ( Ex if( myisr_gat_achar ==true) printf(" char recvd"))
then clear the flag Ex flag myisr_got_achar=false so a future event if it happens can re-trigger it).
Stay with byte size vars don't use word size since they take more than one instruction to assign them allowing for a rare situation in which an interrupt could happen between instructions.