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

PRABAKARDEVA · Oct 7, 2013

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?

arunbharathi.arasu · Oct 7, 2013

select virtual instrumentation mode in left side of ur window,then select Virtual terminal in pic device area.

jayanth.devarayanadurga · Oct 7, 2013

Stack overflow occurs if you have highly nested functions.

PRABAKARDEVA · Oct 7, 2013

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

jayanth.devarayanadurga · Oct 7, 2013

Can't help you without seeing the code. Zip and post project files and Proteus file. Don't just post the code or .c file. I can't create new project.

Venkadesh_M · Oct 7, 2013

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?

Not only using much functions, calling a function inside a function and recursive functions can make stake overflow

Code C - [expand]
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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...

PRABAKARDEVA · Oct 7, 2013

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...

jayanth.devarayanadurga · Oct 7, 2013

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.

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
 
    }
    
}

PRABAKARDEVA · Oct 8, 2013

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...

jayanth.devarayanadurga · Oct 8, 2013

It is a bug of PIC model you are using in Proteus. Zip and post the project files so that it can be debugged. Did you use my code or yours? You code is missing while(1) loop.

Venkadesh_M · Oct 8, 2013

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...

PRABAKARDEVA · Oct 8, 2013

i had tried your code venkadesh...again the same problem occurs.....

Venkadesh_M · Oct 8, 2013

hi stack overflow???

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

PRABAKARDEVA · Oct 8, 2013

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...

Venkadesh_M · Oct 8, 2013

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

PRABAKARDEVA · Oct 8, 2013

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

- - - Updated - - -

why do i wanna write the isr?

Venkadesh_M · Oct 8, 2013

but works fine to me....

Code C - [expand]
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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...

PRABAKARDEVA · Oct 8, 2013

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?

Venkadesh_M · Oct 8, 2013

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..

PRABAKARDEVA · Oct 8, 2013

are u telling me to put the key value in txreg reg?

Code C - [expand]
1 2 3 4 5 6 7 8 9 10 11 12	main() { add(); } add() { multiply(); } multiply() { add(); }

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

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