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[SOLVED] how to check the uart transmission in proteus?

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PRABAKARDEVA

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i know that how to initialize the uart for transmitting the data and also know to write the data into the register.....but when i checked the uart in proteus.....it showing stack overflow error...what is that error?is that error because of program?
 

i didn't use more functions....calling the functions by two times....can u pls post any code for transmitting the data using uart?
 

PRABAKARDEVA said:
i didn't use more functions....calling the functions by two times....can u pls post any code for transmitting the data using uart?
Click to expand...

Not only using much functions, calling a function inside a function and recursive functions can make stake overflow
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main()
{
main();
}

(most of the embedded compilers not offering recursive functions)
or 
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main()
{
add();
}
add()
{
multiply();
}
multiply()
{
add();
}

or simply a ISR could make a stake overflow in higher interrupt rate...
 

Code: 
#include<pic.h>
#include<htc.h>
__CONFIG(FOSC_HS & WDTE_OFF & BOREN_OFF & LVP_OFF & DEBUG_OFF);

#define _XTAL_FREQ   20000000

void main()
{
	TRISC6=1;
	    TRISC7=1;
	unsigned char x;
	unsigned int rate=9600;
	x=((_XTAL_FREQ-(16*rate))/(16*rate));    
		TXREG='0';
		BRGH=1;
		SPBRG=x;
		SYNC=0;
		SPEN=1;
		TXEN=1;
		CREN=1;
		GIE=1;
		PEIE=1;
		TXIE=1;
		RCIE=1;
		
	while(!TXIF)
			 continue;		
			TXREG="HELLO";
	
}

- - - Updated - - -

the coding actually shows something in proteus.....but again stack overflow message is displayed....

- - - Updated - - -

PROTEUS FILE HAS BEEN ATTACHED HERE...
 

Attachments

  • CAP.jpg
    CAP.jpg
    196.9 KB · Views: 128

Try this. There is a bug in Proteus related to baudrate. Change baudrate to 1200 bps or 2400 bps in Proteus Virtual Terminal. It will display properly. Keep baudrate as 9600 bps in code.

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#include<htc.h>
 
__CONFIG(FOSC_HS & WDTE_OFF & BOREN_OFF & LVP_OFF & DEBUG_OFF);
 
#define _XTAL_FREQ 20000000
 
void UART_Write(unsigned char uartData);
void UART_Write_Text(unsigned char *uartData);
 
void UART_Write(unsigned char uartData){
 
    TXREG = uartData;
    while(!TXIF);
}
 
void UART_Write_Text(unsigned char *uartData){
 
    while(*uartData)
        UART_Write(*uartData++);
}
 
void main(){
 
    unsigned char x;
    unsigned int rate=9600;
 
    TRISC6=1;
    TRISC7=1;
 
    x = (_XTAL_FREQ - (16 * rate) / (16 * rate); 
    
       
    BRGH = 1;
    SPBRG = x;
    SYNC = 0;
    SPEN = 1;
    TXEN = 1;
    CREN = 1;
    GIE = 1;
    PEIE = 1;
    TXIE = 1;
    RCIE = 1;
 
    INTCON = 0xC0;
 
    while(1){
 
        UART_Write_Text("Hello");
        //Add delay of 500 ms here
 
    }
    
}
 

yeah...its displayed jayanth......why the error occured?what was happened by the 9600 baud rate in virtual terminal?



thank u..



but the stack overflow problem continues...
 

Code C - [expand]
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#include<htc.h>
 
__CONFIG(FOSC_HS & WDTE_OFF & BOREN_OFF & LVP_OFF & DEBUG_OFF);
 
#define _XTAL_FREQ 20000000
 
void UART_Write(unsigned char uartData);
void UART_Write_Text(unsigned char *uartData);
 
void UART_Write(unsigned char uartData){
 
    TXREG = uartData;
    while(!TXIF);
}
 
void UART_Write_Text(unsigned char *uartData){
 
    while(*uartData)
        UART_Write(*uartData++);
}
 
void main(){
 
    unsigned char x;
    unsigned int rate=9600;
 
    TRISC6=1;
    TRISC7=1;
 
    x = (_XTAL_FREQ - (16 * rate) / (16 * rate); 
    
       
    BRGH = 1;
    SPBRG = x;
    SYNC = 0;
    SPEN = 1;
    TXEN = 1;
    CREN = 1;
    GIE = 1;
 //   PEIE = 1;
    TXIE = 1;
    RCIE = 1;
 
 //   INTCON = 0xC0;
 
    while(1){
 
        UART_Write_Text("Hello");
        //Add delay of 500 ms here
 
    }
    
}

Hi try this code....

- - - Updated - - -

you have not written ISR but enabled peripheral interrupts...

- - - Updated - - -

and also setting 129 instead of x you can see with 9600 baud...
 

hi venkadesh....why did u comment those interrupts?can u explain it?

- - - Updated - - -

hi jayanth..i used your code and my code also....again it was not transmitting the data...
 

stack overflow is not occuring after comment those interrupts.....but it was not transmitting the data....

- - - Updated - - -

why do i wanna write the isr?
 

but works fine to me....untitled.JPG
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#include<htc.h>
 
__CONFIG(FOSC_HS & WDTE_OFF & BOREN_OFF & LVP_OFF & DEBUG_OFF);
 
void UART_Write(unsigned char uartData);
void UART_Write_Text(const char *uartData);
 
void UART_Write(unsigned char uartData){
 
    TXREG = uartData;
    while(!TXIF);
}
 
void UART_Write_Text(const char *uartData){
 
    while(*uartData)
        UART_Write(*uartData++);
}
 
void main(){
 
 
 
    TRISC6=1;
    TRISC7=1;
 
   
    BRGH = 1;
    SPBRG = 129;
    SYNC = 0;
    SPEN = 1;
    TXEN = 1;
    CREN = 1;
 
    while(1){
 
        UART_Write_Text("Hello");
        //Add delay of 500 ms here
    }


- - - Updated - - -

You don wanto write ISR and enabling also dont want enable the peripheral ISR...
 
yeah..its working venkadesh.thank u........after comment those peripheral interrupts...


if i want to write a code for whatever i entering in the keyboard....just want to be displayed in virtual terminal..what should i do?
 

if any key activated (not pressed(if you do so it will transmit continuously when pressing)) put the key value in "void UART_Write(unsigned char uartData)" with addition of '0' (0x30).. that will be shown in the VT..
 

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