Electronic – problem communicating uart with pic

cpicuart

I am trying to do uart program in pic. I want to display characters send by controller to pc. But i am not able to do this. following is my code

#include<pic.h>

__CONFIG(0x3f72);

#define FOSC       10000     //10Mhz==>10000Khz
#define BAUD_RATE   9.6     //9600 Baudrate
#define BAUD_VAL   ((char)(FOSC/ (16 * BAUD_RATE )) – 1)     

void main()
{
 unsigned char ReceiveChar;  
 TRISC=0xc0;   //RC7,RC6 set to usart mode(INPUT)
 TXSTA=0x24;   //Transmit Enable
 SPBRG=BAUD_VAL; //9600 baud at 10Mhz
 RCSTA=0x90;   //Usart Enable, Continus receive enable
 TXREG='0';

 while(1)
 {
   if (RCIF==1) //char received? Send 'A' back to Terminal
       {
     ReceiveChar=RCREG;

     if(TXIF==1)
     TXREG=ReceiveChar;
   }  
  }
}

Best Answer

Well your code looks OK, but do you know that microchip provides PIC18 peripheral library so you can directly use functions, instead of putting values to registers.

Following is the sample code you can use:

#include <plib.h>
#pragma config FNOSC = PRIPLL       
#pragma config POSCMOD = HS         
#pragma config FPLLMUL = MUL_18     
#pragma config FPLLIDIV = DIV_2     
#pragma config FPBDIV = DIV_1       
#pragma config FPLLODIV = DIV_1     
#pragma config FWDTEN = OFF         
#define SYSTEM_FREQUENCY        {define you system frequency here}
#define BAUDRATE                115200
int main()
{
 int pbFreq;
 pbFreq=SYSTEMConfigPerformance(SYSTEM_FREQUENCY);
OpenUART( UART_EN | UART_NO_PAR_8BIT | UART_1STOPBIT, UART_RX_ENABLE | UART_TX_ENABLE, (pbFreq/16/BAUDRATE)-1);
 while(1)
 {
   putsUART("Hello World.!");
 }
}
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