one computer through rs232 serial port control units 255 units of the single-chip stepper motor control system.txt

可通过1台电脑RS232串口控制255台步进电机的单片机控制系统！电脑集中控制上位机控制集散型控制灯光控制 JMDM RS232串口控制步进电机最小系统（最简配置）,可在电脑VB界面在线设定步进电机

///////////VB程序///////////
Const READIIC   As Byte = &H1
Const WRITEIIC  As Byte = &H2
Const RESETIIC  As Byte = &H0

Option Explicit

Dim buff(0 To 32) As Byte           '缓冲区
Dim filebuff(0 To 255) As Byte      '发送文件缓冲区
Dim recebuff(0 To 255) As Byte      '接收文件缓冲区

Dim mycount As Integer              '计数器

Private Sub Command1_Click()

Me.Enabled = False
mycount = 0
'发送写命令和数据
buff(0) = WRITEIIC
Dim i As Integer
For i = 1 To 32
    buff(i) = filebuff(i - 1)
Next i
Mcom.Output = buff

End Sub

Private Sub Command2_Click()
Me.Enabled = False
'发送读命令和数据
mycount = 0
buff(0) = READIIC
Mcom.Output = buff
End Sub

Private Sub Command3_Click()

Dim buff() As Byte
Dim i As Integer
Dim str As String
'打开对话框
CD1.InitDir = "c:\"
CD1.ShowOpen
Text3.Text = CD1.FileName

If Len(Text3.Text) = 0 Then Exit Sub

Command1.Enabled = True
'打开文件
Open Text3.Text For Binary As #1
If LOF(1) = 0 Then End
'--------------------------------
If (LOF(1) > 0) And (LOF(1) < 256) Then
    ReDim buff(0 To LOF(1)) As Byte
    Get 1, , buff()
    
    For i = 0 To LOF(1) - 1
        filebuff(i) = buff(i)
    Next i
    
    For i = LOF(1) To 255
        filebuff(i) = 0
    Next i
    
    
Else
    Get 1, , filebuff()
End If

For i = 0 To 255
If filebuff(i) > 15 Then
    str = str & Hex(filebuff(i)) & "H "
Else
    str = str & "0" & Hex(filebuff(i)) & "H "
End If
Next i
Text1.Text = str
Close #1

End Sub


Private Sub Form_Load()
If Mcom.PortOpen = False Then Mcom.PortOpen = True
End Sub

Private Sub Form_Unload(Cancel As Integer)
If Mcom.PortOpen = True Then Mcom.PortOpen = False
End Sub

Private Sub Mcom_OnComm()
Dim str As String
Dim aa As Variant
Dim i As Integer
'接收数据
If Mcom.CommEvent = 2 Then
    aa = Mcom.Input
    For i = 1 To 32
    recebuff(mycount * 32 + i - 1) = aa(i)
    Next i
    mycount = mycount + 1
    If mycount = 8 Then
        mycount = 0
        For i = 0 To 255
        If recebuff(i) > 15 Then
            str = str & Hex(recebuff(i)) & "H "
        Else
            str = str & "0" & Hex(recebuff(i)) & "H "
        End If
        Next i
        Text2.Text = str
        Me.Enabled = True
    Else
        For i = 1 To 32
            buff(i) = filebuff(mycount * 32 + i - 1)
        Next i
        Mcom.Output = buff
        
    End If
    
End If
End Sub

////////////////////////////////////////////////////////////////////
51单片机端的代码 
//////////////////main.c////////////////////////////
#include"reg51.h"
#include"absacc.h"
#include"stdio.h"
//波特率：4.8K
#define     RESETIIC    0
#define     READIIC        1
#define     WRITEIIC    2
//IIC读写函数
extern unsigned char     Read24c02_OneByte(unsigned char addr) ;
extern     void         Write24c02_OneByte(unsigned char addr,unsigned char ddata);


void init();
void send();
unsigned char buff[33];            //串口缓冲区
//数据结构
/*
  buff[0]------------------命令：0 复位编程器，1 读IIC ，2 写IIC
  buff[1]-buff[32]---------数据
*/
unsigned Address=0;
unsigned char flag=0;
void main()
{
 unsigned char index;
 init();

 while(1)
 {
  while(flag)
  {
   flag=0;
   if(buff[0]==RESETIIC)
   {//0 复位编程器
     for(index=0;index!=33;index++) buff[index]=0;
    Address=0;
   }
   if(buff[0]==READIIC)
   {//1 读IIC
     for(index=1;index!=33;index++) buff[index]=Read24c02_OneByte(Address++);
    send();
   }
   if(buff[0]==WRITEIIC)
   {//2 写IIC
     for(index=1;index!=33;index++) Write24c02_OneByte(Address++,buff[index]);
    send();
   }
  }
 }
}


void init()
{
 unsigned char i;
 TMOD=0x20;     //Timer1 模式2
 TH1=0xF3;     //
 TL1=0xF3;     //
 TR1=1;         //启动Timer1
 PCON|=0x80; //波特率加倍
 SCON=0x50;     //设置串口
 TI=0;
 for(i=0;i!=33;i++) buff[i]=0;
 ES=1;
 EA=1;

}

void com_isr() interrupt 4
{
 unsigned char i;
 EA=0;
 RI=0;
//接收33个字节
 buff[0]=SBUF;
 for(i=1;i!=33;i++)
 {
  while(!RI);RI=0;
  buff[i]=SBUF;
 }

 flag=1;
 EA=1;

}

//发送33个字节
void send()
{
 unsigned char i;
 EA=0;
 for(i=0;i!=33;i++)
 {
  SBUF=buff[i];
  while(!TI);TI=0;
 }
 EA=1;
}
////////////24C02.C////////////////////////
#include "reg51.h"
#include "intrins.h"
#include"51usb.h"                //51USB实验板的头文件
#define uchar     unsigned char
#define uint      unsigned char
#define true  1
#define false 0
#define bool bit
#define Byte unsigned char
#define Word unsigned int
#define read 0x80
#define write 0x00

//私有内部函数
#define    \
SomeNOP(); \
_nop_();_nop_();_nop_();_nop_();

//私有内部函数
void IICStart(void)
{
    EA = 0;
    SDA = 1;SCL = 1;SomeNOP();
    SDA = 0;SomeNOP(); 
    SCL = 0; SDA = 1;
}
//私有内部函数
void IICStop(void)
{
    SCL = 0;SDA = 0;SomeNOP();
    SCL = 1;SomeNOP();SDA = 1;
    EA = 1;
}

//私有内部函数
void SendAck(void)
{
    SDA = 0;SomeNOP();
    SCL = 1;SomeNOP();
    SCL = 0;
}    
//私有内部函数
void SendNotAck(void)
{
    SDA = 1;SomeNOP();
    SCL = 1;SomeNOP();
    SCL = 0;
}
//私有内部函数
void IICSendByte(uchar ch)
{
    uchar i = 8;
    while(i--)
    {
        SCL = 0;_nop_();
        SDA = (bit)(ch&0x80);ch<<=1;SomeNOP();
        SCL = 1;SomeNOP();
    }
    SCL = 0;
}
//私有内部函数
uchar IICReceiveByte(void)
{
    uchar i = 8;
    uchar ddata = 0;
    SDA = 1;
    while(i--)
    {
        ddata<<=1;
        SCL = 0;SomeNOP();
        SCL = 1;SomeNOP();
        if(SDA)ddata |= 0x01;
    }
    SCL = 0;
    return ddata;

}
//私有内部函数
bool WaitAck(void)
{
    SDA = 1;SomeNOP();
    SCL = 1;SomeNOP();
    while(SDA){IICStart();    IICSendByte(0xa0);SDA = 1;SomeNOP();    SCL = 1;SomeNOP();}
    SCL = 0;
    return true;
}

//***********************************
//**公有函数，外部接口             **
//***********************************
//写一个数据
void Write24c02_OneByte(unsigned char addr,unsigned char ddata)
{
    IICStart();
    IICSendByte(0xa0);
    WaitAck();
    IICSendByte(addr);
    WaitAck();
    IICSendByte(ddata);
    WaitAck();
    IICStop();
    SomeNOP();
}
//读一个数据
unsigned char Read24c02_OneByte(unsigned char addr)
{
    uchar temp;
    IICStart();
    IICSendByte(0xa0);  //先写入地址，设置写
    WaitAck();
    IICSendByte(addr);
    WaitAck();
    IICStart();
    IICSendByte(0xa1);   //设置读
    WaitAck();
    temp = IICReceiveByte();
    SendNotAck();
    IICStop();
    return temp;    
}
 

可通过1台电脑RS232串口控制255台步进电机的单片机控制系统！电脑集中控制上位机控制集散型控制灯光控制
JMDM RS232串口控制步进电机最小系统（最简配置）,可在电脑VB界面在线设定步进电机转速、圈数、停顿时间等参数的RS232串口控制步进电机系统