AVR单片机modbus通信源代码

//-----单片机MODBUS通讯-----//#includeiom16v.h#includemacros.h#defineucharunsignedchar#defineuintunsignedint#defineulongunsignedlong#pragmainterrupt_handleruart_rx:12#pragmainterrupt_handlermiao:9/*CRC高位字节值表*/constucharauchCRCHi[]={0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40};/*CRC低位字节值表*/constucharauchCRCLo[]={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};#definemclk16000000ucharclient_id=0x00;//广播通信ucharrdata[],recslot=0,flag;ucharmodbus_time;uintcrc_16(uchar*puchMsg,ucharusDataLen){ucharuchCRCHi=0xFF;//高CRC字节初始化ucharuchCRCLo=0xFF;//低CRC字节初始化ulonguIndex;//CRC循环中的索引while(usDataLen--)//传输消息缓冲区{uIndex=uchCRCHi^*puchMsg++;//计算CRCuchCRCHi=uchCRCLo^auchCRCHi[uIndex];uchCRCLo=auchCRCLo[uIndex];}return(uchCRCHi8|uchCRCLo);}voiddelay(uintms){uinti,j;for(i=0;ims;i++){for(j=0;j22800;j++);}}voiduart_int(ulongbaud){UCSRB=0x00;UCSRA=0x00;//控制寄存器清零baud=mclk/16/baud-1;//波特率最大为65KUBRRL=baud;UBRRH=baud8;//设置波特率UCSRA|=0X01;//多处理器通信模式UCSRB=(1TXEN)|(1RXEN)|(1RXCIE);//接收、发送使能，接收中断使能UCSRC=(1URSEL)|(0UPM0)|(3UCSZ0);//选择UCSRC，异步模式，禁止,8位数据DDRD|=0X04;////配置TX为输出（很重要）PORTD|=0X04;//使能485接受}//----------------1ms----down--------------voidtimer_int(void){TCNT1H=0Xfe;//定计数寄存器初值设计先写高8位TCNT1L=0X0b;//定计数寄存器初值设计再写低8位TCCR1B=0X02;//定时1msTIMSK|=BIT(2);//定时计数器1中断屏蔽寄存器设计第二位TOIE1定时溢出中断使能}voidmiao(void){modbus_time++;TCNT1H=0Xfe;//定计数寄存器初值设计先写高8位TCNT1L=0X0b;//定计数寄存器初值设计再写低8位}//----------------1ms----up--------------//----------接受函数-----------voiduart_rx(void){uchard;d=UDR;if((modbus_time4)&&(d==client_id)){UCSRA&=0Xfe;recslot=0;rdata[recslot++]=d;modbus_time=0;}if(recslot){rdata[recslot++]=d;if(recslot=10){modbus_time=0;UCSRA|=0X01;flag=1;}elsemodbus_time=0;}}//----------接受函数-----------voidmain(void){uchark;uart_int(9600);timer_int();SREG|=BIT(7);//开总中断DDRA=0XFF;while(1){if(flag){PORTA=rdata[k];}}}