Serial communcation using 8051

[NIVESH SHARMA]

Sir I am using a switch on P2.0. when switch off A is transmit infinite times and whent it is off B is transmit infinite times but i want to transmit only one time,what changes i will do in code. 

[AJISH ALFRED]

Hi,

did you mean “P2.0. when switch ON A is transmit infinite times and whent it is OFF B is transmit infinite times”.

You have written “off” only !!

 

What you can do is once an ON condition is detected send A and wait till the condition becomes OFF, and once it is OFF send B and wait till the ON condition is detected. Repeat this in a loop.

 

The following code is just to give you an idea;

 

while ( 1 )

{

    while (OFF); // wait till ON is detected, the condition fails and go to next statement

    sendA ();

    while (ON);  // wait till OFF is detected, the condition fails and go to next statement

    sendB ();

}

[Ashutosh Bhatt]

you have to give key debounce delay after key is pressed. then send A once and enter in continuous loop that will send B only once and do nothing till key is pressed again

 

 

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