uart.c

UART 8051 C

//------------------------------------------------------------------------------------
// UART.c
//------------------------------------------------------------------------------------
// Copyright (C) 2005 Silicon Laboratories, Inc.
//
// AUTH: BD
// DATE: 19 MAY 2008
//
// UART makes LED enable
//
// Tool chain: KEIL Eval 'c'
//

//------------------------------------------------------------------------------------
// Includes
//------------------------------------------------------------------------------------
#include <uart1.h>                    // SFR declarations
#include <stdio.h>

//------------------------------------------------------------------------------------
// Global CONSTANTS
//------------------------------------------------------------------------------------

#define SYSCLK 3062500                    // approximate SYSCLK frequency in Hz
#define BAUDRATE     115200               // Baud rate of UART in bps

long result;                              // ADC0 decimated value
char temp;
char i;

sbit  LED = P1^6;                         // green LED: '1' = ON; '0' = OFF

//------------------------------------------------------------------------------------
// Function PROTOTYPES
//------------------------------------------------------------------------------------
//void UART1_ISR (void) ;
//void tx0_char(char);
//------------------------------------------------------------------------------------
// MAIN Routine
//------------------------------------------------------------------------------------
void main (void) {

   // disable watchdog timer
   WDTCN = 0xde;
   WDTCN = 0xad;
   
   Init_Device();

   EA = 1;											// enable global interrupts

   SFRPAGE = LEGACY_PAGE;                 			// Page to sit in for now

   while (1) {                            			// spin forever
		
   }
}

//------------------------------------------------------------------------------------
// Interrupt Service Routines
//------------------------------------------------------------------------------------

//------------------------------------------------------------------------------------
// UART1_ISR
//------------------------------------------------------------------------------------
// This routine changes the state of the LED whenever UART1 interrupt.
//
// NOTE: The SFRPAGE register will automatically be switched to the UART1 Page
// When an interrupt occurs.  SFRPAGE will return to its previous setting on exit
// from this routine.
//
void UART1_ISR (void) interrupt 20
{
   
   char SFRPAGE_SAVE = SFRPAGE;        // Save Current SFR page   

   SFRPAGE   = UART1_PAGE;
   
   if(RI1 == 1)
   {
    	if(SBUF1 == 0)					
			LED = 0;
		else
			LED = 1;
	}
	RI1 = 0;
		
   /*if(TI1 == 1)
   {
 	   SFRPAGE   = UART1_PAGE;
	   
	   LED = 1;                            // change state of LED
	   printf("A");
	   TI1 = 0;

   }*/

   SFRPAGE = SFRPAGE_SAVE;             // Restore SFR page
}