problem in sending data to pc from microcontroller

[suraksha s]

sir actually this is my serial program to send a letter 'a' on hyper terminal but when i try to load the program to controller ATMEGA 32 and try to display on hyperterminal i am unable to get the data. please help me out as soon as possible

#include <avr/io.h>

int main(void)
{

UCSRC |= (1<<UMSEL); // select asynchronous mode
UCSRC |= (1<<USBS);
UBRRH = 51>>8; // higher 8 bits of 51
UBRRL = 51; // lower 8 bits of 51
UCSRB |= (1<<RXEN)|(1<<TXEN); // enable transmitter and receiver both
UCSRC |= (1<<UCSZ0)|(1<<UCSZ1); // number of data bits is 8

unsigned int send='a';

while((UCSRA & (1<<UDRE))==0) {};

UDR=send;



}

 

[jayanth.devarayanadurga]

Try this links https://extremeelectronics.co.in/avr-tutorials/using-the-usart-of-avr-microcontrollers/
**broken link removed**

See what you are doing wrong. One error is you don't have a infinite while(1) loop in the main(0 function.

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Code C - [expand]
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unsigned int send='a';

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is wrong. It should be unsigned char as you are storing character variable in it.

 

[suraksha s]

sir eventhough if i give a loop and changed it as unsigned char i am not getting output

- - - Updated - - -

this is the changes i have made

#include <avr/io.h>

int main(void)
{

UCSRC |= (1<<UMSEL); // select asynchronous mode
UCSRC |= (1<<USBS);
UBRRH = 51>>8; // higher 8 bits of 51
UBRRL = 51; // lower 8 bits of 51
UCSRB |= (1<<RXEN)|(1<<TXEN); // enable transmitter and receiver both
UCSRC |= (1<<UCSZ0)|(1<<UCSZ1); // number of data bits is 8

unsigned char send='a';
while(1)
{
while((UCSRA & (1<<UDRE))==0) {};

UDR=send;
}



}

 

[jayanth.devarayanadurga]

Where is your interrupt routine for serial communication and you have to include interrupt.h file. I think you are using Atmel Studio. Use the code in the pdf I posted.

Did you try this code?

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Code C - [expand]
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#include < avr / io .h >
#include < avr / interrupt .h >
#define USART_BAUDRATE 9600
#define BAUD_PRESCALE ((( F_CPU / ( USART_BAUDRATE * 16 UL ))) - 1)
int main (void)
{
UCSRB |= (1 << RXEN ) | (1 << TXEN ); // Turn on the transmission and reception circuitry
UCSRC |= (1 << URSEL ) | (1 << UCSZ0 ) | (1 << UCSZ1 ); // Use 8-bit character sizes
UBRRH = ( BAUD_PRESCALE >> 8) ; // Load upper 8-bits of the baud rate value into the high byte
of the UBRR register
UBRRL = BAUD_PRESCALE ; // Load lower 8 -bits of the baud rate value into the low byte of the
UBRR register
UCSRB |= (1 << RXCIE ); // Enable the USART Recieve Complete interrupt (USART_RXC)
sei () ; // Enable the Global Interrupt Enable flag so that interrupts can be processed
for (;;) // Loop forever
{
// Do nothing - echoing is handled by the ISR instead of in the main loop
}
}
ISR ( USART_RXC_vect )
{
char ReceivedByte ;
ReceivedByte = UDR ; // Fetch the received byte value into the variable "ByteReceived"
UDR = ReceivedByte ; // Echo back the received byte back to the computer
}

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