[SOLVED] how to send 'a' char on atmega uart just once or some input occur

[ud23]

hi all i want to do some simple program want send char 'a' only one time not continuous on UART of atmega 8535

void USARTWriteChar(char data)
{
   //Wait untill the transmitter is ready
   
   
   while(!(UCSRA & (1<<UDRE)));
   //{
      //Do nothing
   //}

   //Now write the data to USART buffer
   UDR = data;	 
  
}

i am using this function for sending data but it sending continuous 'a' on hyper when some switch press
i want to send just one time when switch press.Is there any flag bit to stop continuous transmit.

 

[doraemon]

Hello!

You should show us the program that call this function.

Dora.

 

[jayanth.devarayanadurga]

Check these links
http://extremeelectronics.co.in/av...r-microcontrollers-reading-and-writing-data/
http://www.engineersgarage.com/emb...projects/serial-communication-atmega16-usart
http://deans-avr-tutorials.googlecode.com/svn/trunk/InterruptUSART/Output/InterruptUSART.pdf

//Global Variables
unsigned int doonce = 0;


void USARTWriteChar(char data)
{
   if(doonce == 0) {
   	//Wait untill the transmitter is ready
   
   
   	while(!(UCSRA & (1<<UDRE)));
   	//{
      		//Do nothing
   	//}

   	//Now write the data to USART buffer
   	UDR = data;
	doonce = 1;
   }	 
  
}

I think your USARTWriteChar() is called infinitely in the while(1) loop. So, if you send any character to the function it gets printed infinitely.