serial.src

单片机串口通信例程

; serial.SRC generated from: serial.c
; COMPILER INVOKED BY:
;        C:\Keil\C51\BIN\C51.EXE serial.c OPTIMIZE(6,SPEED) BROWSE DEBUG OBJECTEXTEND TABS(3)

$NOMOD51

NAME	SERIAL

P0	DATA	080H
P1	DATA	090H
P2	DATA	0A0H
P3	DATA	0B0H
T0	BIT	0B0H.4
AC	BIT	0D0H.6
T1	BIT	0B0H.5
EA	BIT	0A8H.7
IE	DATA	0A8H
RD	BIT	0B0H.7
ES	BIT	0A8H.4
IP	DATA	0B8H
RI	BIT	098H.0
INT0	BIT	0B0H.2
CY	BIT	0D0H.7
TI	BIT	098H.1
INT1	BIT	0B0H.3
PS	BIT	0B8H.4
SP	DATA	081H
OV	BIT	0D0H.2
WR	BIT	0B0H.6
SBUF	DATA	099H
PCON	DATA	087H
SCON	DATA	098H
TMOD	DATA	089H
TCON	DATA	088H
IE0	BIT	088H.1
IE1	BIT	088H.3
B	DATA	0F0H
ACC	DATA	0E0H
ET0	BIT	0A8H.1
ET1	BIT	0A8H.3
TF0	BIT	088H.5
TF1	BIT	088H.7
RB8	BIT	098H.2
TH0	DATA	08CH
EX0	BIT	0A8H.0
IT0	BIT	088H.0
TH1	DATA	08DH
TB8	BIT	098H.3
EX1	BIT	0A8H.2
IT1	BIT	088H.2
P	BIT	0D0H.0
SM0	BIT	098H.7
TL0	DATA	08AH
SM1	BIT	098H.6
TL1	DATA	08BH
SM2	BIT	098H.5
PT0	BIT	0B8H.1
PT1	BIT	0B8H.3
RS0	BIT	0D0H.3
TR0	BIT	088H.4
RS1	BIT	0D0H.4
TR1	BIT	088H.6
PX0	BIT	0B8H.0
PX1	BIT	0B8H.2
DPH	DATA	083H
DPL	DATA	082H
REN	BIT	098H.4
RXD	BIT	0B0H.0
TXD	BIT	0B0H.1
F0	BIT	0D0H.5
PSW	DATA	0D0H
?PR?serial_init?SERIAL                   SEGMENT CODE 
?PR?serial?SERIAL    SEGMENT CODE 
?PR?getchar?SERIAL   SEGMENT CODE 
?PR?_putchar?SERIAL  SEGMENT CODE 
?PR?_puthex?SERIAL   SEGMENT CODE 
?CO?SERIAL           SEGMENT CODE 
	PUBLIC	HEX_TAB
	PUBLIC	_puthex
	PUBLIC	_putchar
	PUBLIC	getchar
	PUBLIC	serial
	PUBLIC	serial_init

	RSEG  ?CO?SERIAL
HEX_TAB:
	DB  '0' ,'1' ,'2' ,'3' ,'4' ,'5' ,'6' ,'7' ,'8' ,'9' 
	DB  'A' ,'B' ,'C' ,'D' ,'E' ,'F' ,000H


; // 题目：串口初始化C代码
; // 要求:
; // 1.波特率1200bps,无奇偶校验，停止位1，数据位8
; // 2.定时器T1做波特率发生器
; 
; /*
;  * 软件模拟测试说明:
;  * 1.这个测试采用查询方式进行串口通讯
;  * 2.将软件仿真环境的晶震设为11.059 MHz
;  * 3.软件模拟全速运行, 观察波特率是1200bps
;  * 4.在串口1中输入数字或字母,可观察到通讯是否有误。 
; */
; 
; #pragma src
; 
; #include <reg51.h>
; 
; //串口初始化
; void serial_init(void)

	RSEG  ?PR?serial_init?SERIAL
serial_init:
			; SOURCE LINE # 19
; {
			; SOURCE LINE # 20
;    //ET1  = 0;     //CLR   0ABH      ;禁止T1中断
;    TMOD = 0x20;  //MOV   89H,#20H  ;timer 1 mode 2: 8-Bit reload(定时器T1 模式2: 8位自动初值重装)
			; SOURCE LINE # 22
	MOV  	TMOD,#020H
;    TH1  = 0xE8;  //MOV   8DH,#0E8H
			; SOURCE LINE # 23
	MOV  	TH1,#0E8H
;    TL1  = 0xE8;  //MOV   8BH,#0E8H ;1200bps, 11.059
			; SOURCE LINE # 24
	MOV  	TL1,#0E8H
;    TR1  = 1;     //SETB  8EH       ;启动定时器1
			; SOURCE LINE # 25
	SETB 	TR1
;    
;    SCON = 0x50;  // mode 1: 10-bit UART, enable receiver(模式1: 10位异步发送/接收, 使能接收允许位)
			; SOURCE LINE # 27
	MOV  	SCON,#050H
;    //SM1  = 1;     //                ;串行口 模式1
;    //SM0  = 0;
;    //REN  = 1;     //                ;允许串行中断接收
; 
;    SM2  = 1;     //SETB  O9DH      ;收到有效的停止位时才将RI置1
			; SOURCE LINE # 32
	SETB 	SM2
;                   
;    ES   = 1;     //SETB  0ACH      ;允许串行中断 
			; SOURCE LINE # 34
	SETB 	ES
;    EA   = 1;     //SETB  0AFH      ;总中断开
			; SOURCE LINE # 35
	SETB 	EA
; }
			; SOURCE LINE # 36
	RET  	
; END OF serial_init

CSEG	AT	00023H
	LJMP	serial

; 
; //中断方式处理串口数据
; 
; void serial(void) interrupt 4 using 1

	RSEG  ?PR?serial?SERIAL
	USING	1
serial:
			; SOURCE LINE # 40
; {
; 	if(RI)
			; SOURCE LINE # 42
; 	{
			; SOURCE LINE # 43
; 	   // RI = 0;
;       // 串口接收, 采用临时缓冲
; 	}
			; SOURCE LINE # 46
; #if 0
;    if(TI)
;    {
;       // TI = 0;
;       // 串口发送, 没有必要使用中断方式
;    }
; #endif
; 
; }
			; SOURCE LINE # 55
?C0003:
	RETI 	
; END OF serial

; 
; // 查询方式接收串口数据
; unsigned char getchar(void)

	RSEG  ?PR?getchar?SERIAL
getchar:
	USING	0
			; SOURCE LINE # 58
; {
			; SOURCE LINE # 59
?C0004:
;    while(!RI);
			; SOURCE LINE # 60
	JNB  	RI,?C0004
?C0005:
;    RI=0;
			; SOURCE LINE # 61
	CLR  	RI
;    return SBUF;
			; SOURCE LINE # 62
	MOV  	R7,SBUF
; }
			; SOURCE LINE # 63
?C0006:
	RET  	
; END OF getchar

; // 查询方式发送串口数据
; void putchar(unsigned char ch)

	RSEG  ?PR?_putchar?SERIAL
_putchar:
			; SOURCE LINE # 65
;---- Variable 'ch?340' assigned to Register 'R7' ----
; {
			; SOURCE LINE # 66
;    SBUF=ch;
			; SOURCE LINE # 67
	MOV  	SBUF,R7
?C0007:
;    while(!TI);
			; SOURCE LINE # 68
	JNB  	TI,?C0007
?C0008:
;    TI=0;
			; SOURCE LINE # 69
	CLR  	TI
; }
			; SOURCE LINE # 70
	RET  	
; END OF _putchar

; 
; code unsigned char HEX_TAB []="0123456789ABCDEF";
; void puthex(unsigned char ch)

	RSEG  ?PR?_puthex?SERIAL
_puthex:
	USING	0
			; SOURCE LINE # 73
;---- Variable 'ch?441' assigned to Register 'R7' ----
; {
			; SOURCE LINE # 74
;    unsigned char i,j;
;    i=ch>>4;
			; SOURCE LINE # 76
	MOV  	A,R7
	SWAP 	A
	ANL  	A,#0FH
	MOV  	R6,A
;---- Variable 'i?442' assigned to Register 'R6' ----
;    j=ch&0x0f;
			; SOURCE LINE # 77
	MOV  	A,R7
	ANL  	A,#0FH
;---- Variable 'j?443' assigned to Register 'R5' ----
	MOV  	R5,A
;    putchar(HEX_TAB[i]);
			; SOURCE LINE # 78
	MOV  	A,R6
	MOV  	DPTR,#HEX_TAB
	MOVC 	A,@A+DPTR
	MOV  	R7,A
	LCALL	_putchar
;    putchar(HEX_TAB[j]);
			; SOURCE LINE # 79
	MOV  	A,R5
	MOVC 	A,@A+DPTR
	MOV  	R7,A
	LCALL	_putchar
; }
			; SOURCE LINE # 80
	RET  	
; END OF _puthex

	END