用stm32库函数编写的modbus源代码Word文档下载推荐.docx
《用stm32库函数编写的modbus源代码Word文档下载推荐.docx》由会员分享,可在线阅读,更多相关《用stm32库函数编写的modbus源代码Word文档下载推荐.docx(33页珍藏版)》请在冰豆网上搜索。
03不合法数据查询数据区的值是从机不允许的值。
(在起始地址的基础上,这个数量是不合法的)
供用户调用的函数有:
1.voidModInit(u8Id);
//用于Modbus初始化,在函数调用前,必须初始化函数,用于Main函数中
2.voidModRcv(void);
//用于modbus信息接收,放在串口接收中断
3.voidModSend(void);
//用于modbus信息接收,放在串口发送中断
例如:
voidUSART1_IRQHandler(void)//USART1中断
{
if(USART_GetITStatus(USART1,USART_IT_RXNE)!
=RESET)
{
voidModRcv(void);
……
}
if(USART_GetITStatus(USART1,USART_IT_TC)!
voidModSend(void);
//用于modbus信息接收
}*/
//modbus用通讯参数
u8Tim_Out;
//大于3.5个字符时间,保守取3ms(波特率9600的时候大约2点几毫秒)
u8Rcv_Complete;
//一帧是否已经接受完成
u8Send_Complete;
//一帧是否已经发送完成
u8Com_busy;
//通讯繁忙,表示上一帧还未处理结束
u8Rcv_Buffer[210];
//用来存放接收到的完整的一帧数据(第一个字节用来存放接收到的有效字节数,也就是数组中的有效字节数)
u8Send_Buffer[210];
//用来存放待发送的完整的一帧数据(第一个字节用来存放待发送的有效字节数,也就是数组中的有效字节数)
u8Rcv_Data;
//用来存放接收的一个字节
u8Send_Data;
//用来存放要发送的一字节
u8Mod_Id;
//用来标志作为从站的站号
u8Rcv_Num;
//用来表示接收的一帧的有效字节数(从功能码到CRC校验)
u8Send_Num;
//用来表示待发送的一帧的字节数
u8*PointToRcvBuf;
//用来指向接收的数据缓存
u8*PointToSendBuf;
//用来指向带发送的数据缓存
u8Comu_Busy;
//用来表示能否接收下一帧数据
u8HaveMes;
externu16HoldReg[100];
//CRC校验查表用参数
/*CRC高位字节值表*/
staticu8auchCRCHi[]={
0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,
0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,
0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,
0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,
0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,
0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,
0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,
0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,
0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,
0x80,0x41,0x00,0xC1,0x81,0x40
};
/*CRC低位字节值表*/
staticu8auchCRCLo[]={
0x00,0xC0,0xC1,0x01,0xC3,0x03,0x02,0xC2,0xC6,0x06,
0x07,0xC7,0x05,0xC5,0xC4,0x04,0xCC,0x0C,0x0D,0xCD,
0x0F,0xCF,0xCE,0x0E,0x0A,0xCA,0xCB,0x0B,0xC9,0x09,
0x08,0xC8,0xD8,0x18,0x19,0xD9,0x1B,0xDB,0xDA,0x1A,
0x1E,0xDE,0xDF,0x1F,0xDD,0x1D,0x1C,0xDC,0x14,0xD4,
0xD5,0x15,0xD7,0x17,0x16,0xD6,0xD2,0x12,0x13,0xD3,
0x11,0xD1,0xD0,0x10,0xF0,0x30,0x31,0xF1,0x33,0xF3,
0xF2,0x32,0x36,0xF6,0xF7,0x37,0xF5,0x35,0x34,0xF4,
0x3C,0xFC,0xFD,0x3D,0xFF,0x3F,0x3E,0xFE,0xFA,0x3A,
0x3B,0xFB,0x39,0xF9,0xF8,0x38,0x28,0xE8,0xE9,0x29,
0xEB,0x2B,0x2A,0xEA,0xEE,0x2E,0x2F,0xEF,0x2D,0xED,
0xEC,0x2C,0xE4,0x24,0x25,0xE5,0x27,0xE7,0xE6,0x26,
0x22,0xE2,0xE3,0x23,0xE1,0x21,0x20,0xE0,0xA0,0x60,
0x61,0xA1,0x63,0xA3,0xA2,0x62,0x66,0xA6,0xA7,0x67,
0xA5,0x65,0x64,0xA4,0x6C,0xAC,0xAD,0x6D,0xAF,0x6F,
0x6E,0xAE,0xAA,0x6A,0x6B,0xAB,0x69,0xA9,0xA8,0x68,
0x78,0xB8,0xB9,0x79,0xBB,0x7B,0x7A,0xBA,0xBE,0x7E,
0x7F,0xBF,0x7D,0xBD,0xBC,0x7C,0xB4,0x74,0x75,0xB5,
0x77,0xB7,0xB6,0x76,0x72,0xB2,0xB3,0x73,0xB1,0x71,
0x70,0xB0,0x50,0x90,0x91,0x51,0x93,0x53,0x52,0x92,
0x96,0x56,0x57,0x97,0x55,0x95,0x94,0x54,0x9C,0x5C,
0x5D,0x9D,0x5F,0x9F,0x9E,0x5E,0x5A,0x9A,0x9B,0x5B,
0x99,0x59,0x58,0x98,0x88,0x48,0x49,0x89,0x4B,0x8B,
0x8A,0x4A,0x4E,0x8E,0x8F,0x4F,0x8D,0x4D,0x4C,0x8C,
0x44,0x84,0x85,0x45,0x87,0x47,0x46,0x86,0x82,0x42,
0x43,0x83,0x41,0x81,0x80,0x40
//声明modbus的函数
voidModInit(u8Id);
//用于Modbus初始化,参数Id为站号(1-255)
voidModRcv(void);
voidModSend(void);
voidMessageHandle(u8*pointer_in,u8*pointer_out);
//处理收到的信息帧
voidReadOutputBit(u8*pointer_1,u8*pointer_2);
//读线圈
voidReadInputBit(u8*pointer_1,u8*pointer_2);
//读输入位
voidReadHoldingReg(u8*pointer_1,u8*pointer_2);
//读保持寄存器
voidReadInputReg(u8*pointer_1,u8*pointer_2);
//读输入寄存器
voidForceSingleCoil(u8*pointer_1,u8*pointer_2);
//强制单个线圈
voidPresetSingleReg(u8*pointer_1,u8*pointer_2);
//预制单个寄存器
voidForceMulCoil(u8*pointer_1,u8*pointer_2);
//强制多个线圈
voidPresetMulReg(u8*pointer_1,u8*pointer_2);
//预制多个寄存器
voidErrorHandle(u8Mode,u8*Pointer);
//错误信息帧处理
u16CRC16(u8*puchMsgg,u8usDataLen);
//用于计算CRC校验码
/*函数功能:
用于Modbus初始化
函数输入:
Id为Modbus站号。
函数输出:
无。
*/
voidModInit(u8Id)
//modbus参数初始化
PointToRcvBuf=Rcv_Buffer;
PointToSendBuf=Send_Buffer;
Send_Num=1;
//发送的数据顺序(输出数组的第几个数)
Mod_Id=Id;
//站号设置
Rcv_Buffer[1]=Mod_Id;
Send_Buffer[1]=Mod_Id;
Comu_Busy=0;
}
用于Modbus信息接收
voidModRcv(void)
HaveMes=1;
//表示接收到了信息
Rcv_Data=USART_ReceiveData(USART1);
if(Comu_Busy!
=1)//如果不忙,可以接收下一帧信息
TIM_Cmd(TIM2,DISABLE);
TIM_SetCounter(TIM2,0);
if((Tim_Out!
=0)&
&
(Rcv_Data==Mod_Id))//如果间隔时间超过了3.5个字符,同时接受的字节和自己的站号一致,则认为接收开始
{
Rcv_Complete=0;
//表示数据帧接收开始
Rcv_Num=0;
//接收数据个数初始化
Rcv_Num++;
//同时个数加一
}
if((0==Tim_Out)&
(0==Rcv_Complete))//如果处于接收一帧的正常过程中
if(Rcv_Num<
100)
{
Rcv_Buffer[Rcv_Num+1]=Rcv_Data;
//将数据放入接收数组中
Rcv_Num++;
//同时个数加一
}
else
Rcv_Complete=1;
Comu_Busy=1;
Rcv_Buffer[0]=Rcv_Num;
*(PointToSendBuf+2)=*(PointToRcvBuf+2);
//获取功能码
ErrorHandle(6,PointToSendBuf);
//表示超出了字节数(从机设备忙碌)
Rcv_Num=0;
Tim_Out=0;
TIM_Cmd(TIM2,ENABLE);
//开启4.5ms计时(三个半字符的保守估计)
用于Modbus信息发送
*/
voidModSend(void)
{
Send_Data=*(PointToSendBuf+Send_Num);
USART_SendData(USART1,Send_Data);
Send_Num++;
if(Send_Num>
(*PointToSendBuf))//发送已经完成
Comu_Busy=0;
*PointToSendBuf=0;
Rcv_Num=0;
Send_Num=1;
//启动数据发送
USART_ITConfig(USART1,USART_IT_TC,DISABLE);
//关闭数据发送中断
Modbus专用定时器(TIM2)
*/
voidTIM2_IRQHandler(void)
if(TIM_GetITStatus(TIM2,TIM_IT_Update)!
=RESET)//检查指定的TIM中断发生与否:
TIM中断源
TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
//清除TIMx的中断待处理位:
TIM中断源
Tim_Out=1;
TIM_Cmd(TIM2,DISABLE);
TIM_SetCounter(TIM2,0);
Rcv_Complete=1;
Rcv_Buffer[0]=Rcv_Num;
if(HaveMes!
=0&
Rcv_Num>
4)
Comu_Busy=1;
MessageHandle(PointToRcvBuf,PointToSendBuf);
}
CRC校验用函数
puchMsgg是要进行CRC校验的消息,usDataLen是消息中字节数
计算出来的CRC校验码。
u16CRC16(u8*puchMsgg,u8usDataLen)//puchMsgg是要进行CRC校验的消息,usDataLen是消息中字节数
{
u8uchCRCHi=0xFF;
/*高CRC字节初始化*/
u8uchCRCLo=0xFF;
/*低CRC字节初始化*/
u8uIndex;
/*CRC循环中的索引*/
while(usDataLen--)/*传输消息缓冲区*/
uIndex=uchCRCHi^*puchMsgg++;
/*计算CRC*/
uchCRCHi=uchCRCLo^auchCRCHi[uIndex];
uchCRCLo=auchCRCLo[uIndex];
return((uchCRCHi<
<
8)|uchCRCLo);
}
对输入的信息帧进行处理,按照功能码不同,调用不同的函数处理
两个指针,pointer_1指向用来存放输入信息帧的数组,
pointer_2用来指向存放输出信息帧的数组(两个数组的第一个元素都用来存放信息帧的有效字节个数)
后面的元素按照Modbus协议组织。
voidMessageHandle(u8*pointer_in,u8*pointer_out)
u16CalKey;
//计算出来的校验值
u16RcvKey;
//接收到的校验值
HaveMes=0;
//清除信息位
//获取接收到的校验值
RcvKey=(u16)*(pointer_in+(*pointer_in-1));
RcvKey=RcvKey<
8;
RcvKey=RcvKey|(u16)*(pointer_in+(*pointer_in));
CalKey=CRC16(pointer_in+1,*pointer_in-2);
if(CalKey==RcvKey)
switch(*(pointer_in+2))//第二个字节为功能码
case0x01:
ReadOutputBit(pointer_in,pointer_out);
//读输出线圈
break;
case0x02:
ReadInputBit(pointer_in,pointer_out);
case0x03:
ReadHoldingReg(pointer_in,pointer_out);
//读保持寄存器
case0x04:
ReadInputReg(pointer_in,pointer_out);
case0x05:
ForceSingleCoil(pointer_in,pointer_out);
//强制单个线圈状态
case0x06:
PresetSingleReg(pointer_in,pointer_out);
case0x0F:
ForceMulCoil(pointer_in,pointer_out);
case0x10:
PresetMulReg(pointer_in,pointer_out);
default:
*(pointer_out+2)=*(pointer_in+2);
ErrorHandle(1,pointer_out);
//功能码错误
}
else
}
读取线圈状态
voidReadOutputBit(u8*pointer_1,u8*pointer_2)//pointer_1用作输入,pointer_2用作输出
u16Address=0;
//待读取线圈起始地址(GPIO_X,X为A,B两个端口,每个端口16位,对应地址0——31)
u16Num=0;
//要读取的线圈个数
u8Byte=0;
//要读取的线圈个数总共占用的字节数;
u32PortTemp;
//用来存