gistfile1.txt

// Receive usart
#include <18f4520.h>
#use delay(clock=20000000)
#fuses HS, NOWDT, NOLVP
#include "../Library/18f4520ptr.h"
#include "../Library/modifiedlcd.h"

#INT_RDA
void int_rda_isr(){
   //output_high(PIN_A0);
   //delay_ms(400);

   output_high(PIN_C0);
   printf(lcd_putc, "\f %c", *RCREG);

   *TXREG = *RCREG +1;
}

main(){
   lcd_init();
   ADCON1->PCFGx=0xF; // All Digital
   *TRISC=0x80;
   *TRISA=0x00;

   TXSTA->TXEN=1; // Tx On
   TXSTA->SYNC=0; // Asynch
   TXSTA->BRGH=0; // Low Speed
   RCSTA->SPEN=1; // Rx On          RCSTA is setting up two interupts.
   RCSTA->CREN=1; // Rx Cont. on
   BAUDCON->BRG16=1;       // Setting baud rate based off of table.
   *SPBRG=129; // setting the interupt
   PIE1->RCIE=1;  // Rx Interupt Enable
                  // If Tx Enable is ON it wont work.
   INTCON->GIE=1;
   INTCON->PEIE=1;
   while(1){
   //printf(lcd_putc, "\f hello");
   //delay_ms(300);
   }
}