模拟串口C语言程序代码

只看该作者 · 2024-6-24 23:49

[code]#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

//定义使用哪个定时器, 只可定义一个
#define TIMER_0
//#define TIMER_1

//定义串口收、发送管脚。
sbit rs_TXD = P2^1;
sbit rs_RXD = P2^0;

//根据定时器确定参数
#ifdef TIMER_0
#define TMOD_AND_WORD 0xF0;
#define TMOD_TIME_MODE  0x01;
#define TMOD_COUNT_MODE 0x05;    //设置计数模式位
sbit  TCON_ENABLE_TIMER = TCON^4;
sbit  TCON_TFx = TCON^5;          //中断标志位
sbit  IE_ETx = IE^1;             //中断允许位为 ET0
sbit  IP_PTx = IP^1;             //中断优先级

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;    //设置计数模式位
sbit  TCON_ENABLE_TIMER = TCON^6;  //
sbit  TCON_TFx = TCON^7;          //中断标志位
sbit  IE_ETx = IE^3;             //中断允许位为 ET1
sbit  IP_PTx = IP^4;             //中断优先级

sfr rs_timerL = 0x8B;             //TL1
sfr rs_timerH = 0x8D;             //TH1
#endif

INT8U bdata rs_BUF;                //串行收、发时用的移位暂存器。
sbit rs_BUF_bit7 = rs_BUF^7;       //移位暂存器的最高位。
INT8U rs_shift_count;             //移位计数器。

INT8U bdata rsFlags;
sbit rs_f_TI       = rsFlags^0; //0:正在发送; 1: 一个字符完毕
sbit rs_f_RI_enable  = rsFlags^1; //0:禁止接收; 1:允许接收
sbit rs_f_TI_enable  = rsFlags^2; //0:禁止发送; 1:允许发送

//选择以下一个晶体频率
//#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

//选择以下一个波特率:
//#efine Baud 300                   //11.059MHz时，baud 最低为 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、发一位所需定时器计数
#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、发一位所需定时器计数高位
#define rs_FULL_BIT_L (rs_FULL_BIT & 0x00FF)  //收、发一位所需定时器计数低位

//检测起始位的时间间隔所需定时器计数
#define rs_TEST0 rs_FULL_BIT0 / 4          //波特率较低时可以除以 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

//发送起始位所需定时器总计数
#define rs_START_BIT 0xFFFF - (Fosc/12/Baud) + 0x28
#define rs_START_BIT_H rs_START_BIT >> 8    //发送起始位所需定时器计数高位
#define rs_START_BIT_L rs_START_BIT & 0x00FF  //发送起始位所需定时器计数低位

#define rs_RECEIVE_MAX 32                //最大接收长度
INT8U idata rs232buffer[rs_RECEIVE_MAX];    //收、发缓冲区
INT16U  ReceivePoint;                      //接收数据存储指针

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;          //停止定时器
TMOD &= TMOD_AND_WORD;
TMOD |= TMOD_TIME_MODE;
rs_RXD = 1;                      //接收脚置成高电平
rs_TXD = 1;                      //发射脚置成高电平
IP_PTx = 1;                      //置中断优先级为高
IE_ETx = 1;                      //允许定时器中断
}

void soft_receive_init()             //监测起始位
{
TCON_ENABLE_TIMER = 0;          //停止定时器
rs_timerH = rs_TEST_H;
rs_timerL = rs_TEST_L;
rs_shift_count = 0;
TCON_ENABLE_TIMER = 1;          //启动定时器
}

void soft_receive_enable()          //允许接收
{
rs_f_RI_enable = 1;             //允许接收
rs_f_TI_enable = 0;             //禁止发送
soft_receive_init();             //监测起始位, RXD 下降沿触发接收字节过程.
}

void soft_send_enable (void)          //允许发送
{
TCON_ENABLE_TIMER = 0;          //停止定时器
rs_f_TI_enable = 1;             //允许发送
rs_f_RI_enable = 0;             //禁止接收

rs_shift_count = 0;             //清移位计数器
rs_f_TI = 1;                   //发送一个字符完毕标志
TCON_ENABLE_TIMER = 1;          //启动定时器
}