PIC UART not working in proteus .

[azarutz]

hi i wrote program for pic uart in hitech-c and i am trying to simulate it in proteus and i need help .I used LCD to display data which i typed in virtual terminal is it works . what is virtual terminal in proteus . is it used to send and receive data from microcontroller .

#include<htc.h>
#include"lcd.h"
void pic_init();
void uart_init();
void transmit(char);
int data , rdata;
void interrupt ISR(void)
{
if(RCIF==1)
 { 
   if(OERR)
   {
    CREN=0;
    CREN=1;	
   }
  rdata=RCREG;   
 }
}
void main ()
{
 pic_init();
 uart_init();
 lcd_init(); 
 transmit('H');
 while(1)
 {
  printf("recived data=%c" ,rdata);  
 }
}
void pic_init()
{
 RC6=0;
 RC7=1;
 PORTD=0x00;
 PORTB=0xf8;
 GIE=1;
 PEIE=1;
 TXIE=1;
 RCIE=1; 
}
void uart_init()
{
 TX9=0;
 TXEN=1;
 SYNC=0;
 BRGH=1;
 SPEN=1;
 RX9=0;
 CREN=1;
 SPBRG = 129;
}
void transmit(char data)
{
 TXREG=data;
 while(!TRMT);
}

 

[aserhasan]

Could you post your proteus project files?

 

[azarutz]

Hi , sorry for late reply . i attached my file .

 

[jayanth.devarayanadurga]

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Code C - [expand]
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void transmit(char data)
{
 TXREG=data;
 while(!TXIF);
}

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Zip and post your MPLAB project files for quick solution.

 

[azarutz]

Hi , thanks for reply here is my file

 

[spudboy488]

Try these:

void pic_init()
{
 TRISC=0b10111111; 	// Was RC6=0; and RC7=1;
 TRISD=0x00;		// Was PORTD=0x00;
 TRISB=0xf8;		// Was PORTB=0xf8;
 
 GIE=1;
 PEIE=1;
 //TXIE=1;			// No need for this
 RCIE=1; 
}
void uart_init()
{
	
 SPEN=0;			// Missing: Disable UART to configure
 TX9=0;
 TXEN=1;
 SYNC=0;
 BRGH=1;
 
 RX9=0;
 CREN=1;
 SPBRG = 129;
 SPEN=1;			// Moved: Enable port once it's configured
}

 

[jayanth.devarayanadurga]

There is no TRISx and Config settings. RCEN = 1 is missing.

 

[spudboy488]

For further clarification, the reason the transmit interrupt enable (TXIE=1) is not needed is that your interrupt service routine didn't do anything with it. This was the cause for the program to hang. When you sent the 'H', it triggered the transmit interrupt but you never handled it or cleared the flag so it got stuck in the service routine.