51單片機(jī)模擬串口C語言程序代碼

作者：時(shí)間：2016-11-28 來源：網(wǎng)絡(luò)

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#include "string.h"

#include"stdio.h"

#include

sfr16 DPTR = 0x82;

typedef unsigned char INT8U;

typedef unsigned int INT16U;

typedef unsigned char uint8_t;

typedef unsigned int uint16_t;

typedef unsigned int uchar;

typedef unsigned char byte;

typedef unsigned int word;

#define YES 1

#define NO 0

//定義使用哪個(gè)定時(shí)器, 只可定義一個(gè)

#define TIMER_0

//#define TIMER_1

//定義串口收、發(fā)送管腳。

sbit rs_TXD = P2^1;

sbit rs_RXD = P2^0;

//根據(jù)定時(shí)器確定參數(shù)

#ifdef TIMER_0

#define TMOD_AND_WORD 0xF0;

#define TMOD_TIME_MODE 0x01;

#define TMOD_COUNT_MODE 0x05; //設(shè)置計(jì)數(shù)模式位

sbit TCON_ENABLE_TIMER = TCON^4;

sbit TCON_TFx = TCON^5; //中斷標(biāo)志位

sbit IE_ETx = IE^1; //中斷允許位為 ET0

sbit IP_PTx = IP^1; //中斷優(yōu)先級(jí)

sfr rs_timerL = 0x8A; //TL0

sfr rs_timerH = 0x8C; //TH0

#endif

#ifdef TIMER_1

#define TMOD_AND_WORD 0x0F;

#define TMOD_TIME_MODE 0x10;

#define TMOD_COUNT_MODE 0x50; //設(shè)置計(jì)數(shù)模式位

sbit TCON_ENABLE_TIMER = TCON^6; //

sbit TCON_TFx = TCON^7; //中斷標(biāo)志位

sbit IE_ETx = IE^3; //中斷允許位為 ET1

sbit IP_PTx = IP^4; //中斷優(yōu)先級(jí)

sfr rs_timerL = 0x8B; //TL1

sfr rs_timerH = 0x8D; //TH1

#endif

INT8U bdata rs_BUF; //串行收、發(fā)時(shí)用的移位暫存器。

sbit rs_BUF_bit7 = rs_BUF^7; //移位暫存器的最高位。

INT8U rs_shift_count; //移位計(jì)數(shù)器。

INT8U bdata rsFlags;

sbit rs_f_TI = rsFlags^0; //0:正在發(fā)送; 1: 一個(gè)字符完畢

sbit rs_f_RI_enable = rsFlags^1; //0:禁止接收; 1:允許接收

sbit rs_f_TI_enable = rsFlags^2; //0:禁止發(fā)送; 1:允許發(fā)送

//選擇以下一個(gè)晶體頻率

//#define Fosc 6000000 //6MHz

#define Fosc 11059200 //11.059MHz

//#define Fosc 12000000

//#define Fosc 18432000

//#define Fosc 20000000

//#define Fosc 24000000

//#define Fosc 30000000

//#define Fosc 40000000

//選擇以下一個(gè)波特率:

//#efine Baud 300 //11.059MHz時(shí)，baud 最低為 300

//#define Baud 1200

//#define Baud 2400

//#define Baud 4800

#define Baud 9600

//#define Baud 14400

//#define Baud 19200

//#define Baud 28800

//#define Baud 38400

//#define Baud 57600

//收、發(fā)一位所需定時(shí)器計(jì)數(shù)

#define rs_FULL_BIT0 ((Fosc/12) / Baud)

#define rs_FULL_BIT (65536 - rs_FULL_BIT0)

#define rs_FULL_BIT_H rs_FULL_BIT >> 8 //收、發(fā)一位所需定時(shí)器計(jì)數(shù)高位

#define rs_FULL_BIT_L (rs_FULL_BIT & 0x00FF) //收、發(fā)一位所需定時(shí)器計(jì)數(shù)低位

//檢測起始位的時(shí)間間隔所需定時(shí)器計(jì)數(shù)

#define rs_TEST0 rs_FULL_BIT0 / 4 //波特率較低時(shí)可以除以 3 或除以 2

#define rs_TEST ((~rs_TEST0))

#define rs_TEST_H rs_TEST >> 8 //高位

#define rs_TEST_L rs_TEST & 0x00FF //低位

//發(fā)送起始位所需定時(shí)器總計(jì)數(shù)

#define rs_START_BIT 0xFFFF - (Fosc/12/Baud) + 0x28

#define rs_START_BIT_H rs_START_BIT >> 8 //發(fā)送起始位所需定時(shí)器計(jì)數(shù)高位

#define rs_START_BIT_L rs_START_BIT & 0x00FF //發(fā)送起始位所需定時(shí)器計(jì)數(shù)低位

#define rs_RECEIVE_MAX 32 //最大接收長度

INT8U idata rs232buffer[rs_RECEIVE_MAX]; //收、發(fā)緩沖區(qū)

INT16U ReceivePoint; //接收數(shù)據(jù)存儲(chǔ)指針

void soft_rs232_interrupt( void );

#ifdef TIMER_0

void timer0 (void) interrupt 1 using 3

{

if (rs_RXD == 0 | rs_shift_count > 0)

{ soft_rs232_interrupt(); }

else

{

rs_timerH = rs_TEST_H;

rs_timerL = rs_TEST_L;

}

#endif

#ifdef TIMER_1

void timer1 (void) interrupt 3 using 3

{

if (rs_RXD == 0 | rs_shift_count > 0)

{ soft_rs232_interrupt(); }

else

{

rs_timerH = rs_TEST_H;

rs_timerL = rs_TEST_L;

}

#endif

void soft_rs232_init (void) //串口初始化

{

TCON_ENABLE_TIMER = 0; //停止定時(shí)器

TMOD &= TMOD_AND_WORD;

TMOD |= TMOD_TIME_MODE;

rs_RXD = 1; //接收腳置成高電平

rs_TXD = 1; //發(fā)射腳置成高電平

IP_PTx = 1; //置中斷優(yōu)先級(jí)為高

IE_ETx = 1; //允許定時(shí)器中斷

}

void soft_receive_init() //監(jiān)測起始位

{

TCON_ENABLE_TIMER = 0; //停止定時(shí)器

rs_timerH = rs_TEST_H;

rs_timerL = rs_TEST_L;

rs_shift_count = 0;

TCON_ENABLE_TIMER = 1; //啟動(dòng)定時(shí)器

}

void soft_receive_enable() //允許接收

{

rs_f_RI_enable = 1; //允許接收

rs_f_TI_enable = 0; //禁止發(fā)送

soft_receive_init(); //監(jiān)測起始位, RXD 下降沿觸發(fā)接收字節(jié)過程.

}

void soft_send_enable (void) //允許發(fā)送

{

TCON_ENABLE_TIMER = 0; //停止定時(shí)器

rs_f_TI_enable = 1; //允許發(fā)送

rs_f_RI_enable = 0; //禁止接收

rs_shift_count = 0; //清移位計(jì)數(shù)器

rs_f_TI = 1; //發(fā)送一個(gè)字符完畢標(biāo)志

TCON_ENABLE_TIMER = 1; //啟動(dòng)定時(shí)器

}

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