uart.c

来自「80c51F020的开发程序 包括ADC DDS DAC」· C语言 代码 · 共 34 行

/*------------------------------------------------------------
	File Name: 		uart.c
	Auther:			Samuel
	Revision:		R1
	History:		R1			Jul.05, 2007		Creation
------------------------------------------------------------*/

#include "common.h"
#include "uart.h"


void uart_init(void)
{
	//UART0, mode:1, baud:115200(22.1184MHz), 8bit

	PCON |= 0x80;										// SMOD=1 (HW_UART uses Timer 1 overflow
															// with no divide down).

	TMOD = 0x20;										// Configure Timer 1 for use by HW_UART
	CKCON |= 0x10;										// Timer 1 derived from SYSCLK
	TH1 = 0xF4;							// Timer 1 initial value
	TL1 = 0xF4;							// Timer 1 reload value

	TR1 = 1;    										// Start Timer 1

	RI=0;													// Clear HW_UART receive and transmit
	TI=0;													// complete indicators.

	SCON = 0x50;										// Configure HW_UART for mode 1, receiver enabled.

    	SBUF=0x00;// NULL: make the first TI=1


}