mc8051fun/uart_init.c

#include "mc8051fun.h"

//#include <stc12.h>
#include <at89c51ed2.h>

void uart_init(long fosc, long baud)
{
	TMOD = 0x20;       // Timer 1 in Mode 2
	TH1 = 0xFD;        // 9600 baud rate
	TL1 = 0xFD;        // Initial value (not necessary)
	TR1 = 1;           // Start Timer 1
	SCON = 0x50;       // 8-bit data, 1 stop bit, REN enabled
	return;


	TMOD = 0;		/* Timer 1, 8-bit auto reload mode */
	//   P_SW1 |= (1 << 6); // move UART1 pins -> P3_6:rxd, P3_7:txd
	
	// UART1 use Timer2
//	T2L = (65536 - (fosc / 4 / baud)) & 0xFF;
//	T2H = (65536 - (fosc / 4 / baud)) >> 8;

	SM0 = 0;
	SM1 = 1;	// serial mode 1: 8-bit async
//	AUXR |= 0x14;	// T2R: run T2, T2x12: T2 clk src sysclk/1
//	AUXR |= 0x01;	// S1ST2: T2 is baudrate generator
	SCON = 0x50;  	

	TMOD |= T1_M1;
	TI=1;
	TCLK=0;
	RCLK=0;
//	TBCK=0;
//	RBCK=0;
//
	TH1=0xFD;


	//SMOD0=0;

    ES = 1;                     // enable uart1 interrupt
    EA = 1;                     // enable interrupts
    REN = 1;



}