/*************************************
**** Microware Pripherals Library ****
Author : Microware
Date : 06/20/2013
Description : Modbus RTU (Slave Functions)
Version : 1.7
Email : m.microware@gmail.com
*************************************/
char modbus_rtu(char*);
word crc16(byte*, word);
void byte_to_port(byte *,byte);
extern word D[300];
// 3 milisecond receive timeout interrupt
interrupt [TCC0_OVF_vect] void tcc0_overflow_isr(void)
{
modbus(rx_buffer_usarte0);
clear_buffer_usarte0();
}
char modbus_rtu(char *buf)
{
word adr,addr,num,crc,crc2,data[20];
byte slv,cmd,data_num=0;
byte i,j;
char *str,buf2[20];
str=buf;
slv=*str++;
if (slv!=slave_num) return 0;
cmd=*str++;
adr=((*str++)*0x100)+*str++;
num=((*str++)*0x100)+*str++;
if (cmd>10)
{
data_num=*str++;
for (i=0;i<20;i++) data[i]=0;
for (i=0;i<data_num;i++)
{
j=*str++;
data[i/2]*=0x100;
data[i/2]+=j;
}
}
crc=crc16(buf,(word)(str-buf));
strcpyf(buf,"");
crc2=((*str++)*0x100)+*str++;
if (crc!=crc2) return 0;
str=buf;
switch (cmd)
{
case 3: //Read Holding Registers
num=num*2;
*str++=slave_num; *str++=cmd; *str++=num;
for (i=0;i<(num/2);i++)
{
*str++=(byte)(D[(adr+1)+i]>>8);
*str++=(byte)(D[(adr+1)+i]&0xFF);
}
crc=crc16(buf,(word)(str-buf));
*str++=(byte)(crc>>8);
*str++=(byte)(crc&0xFF);
byte_to_port(buf,str-buf);
return 1;
case 6: //Preset Single Register
D[adr+1]=num;
addr=(byte)(adr+1);
if (addr>200 && addr<=300)
writeeeprom((addr-200)*2,(byte *)&num,2);
//eD[adr+1]=num;
*str++=slave_num; *str++=cmd;
*str++=(byte)adr>>8;
*str++=(byte)adr&0xFF;
*str++=(byte)(D[adr+1]>>8);
*str++=(byte)(D[adr+1]&0xFF);
crc=crc16(buf,(word)(str-buf));
*str++=(byte)(crc>>8);
*str++=(byte)(crc&0xFF);
byte_to_port(buf,str-buf);
return 1;
case 16: //Preset Multiple Register
for (i=0;i<num;i++)
{
D[adr+i+1]=data[i];
addr=(byte)adr+1;
addr+=i;
if (addr>200 && addr<=300)
writeeeprom((addr-200)*2,(byte *)&data[i],2);
//eD[adr+1]=data[i];
}
*str++=slave_num; *str++=cmd;
*str++=(byte)(adr>>8);
*str++=(byte)(adr&0xFF);
*str++=(byte)(num>>8);
*str++=(byte)(num&0xFF);
crc=crc16(buf,(word)(str-buf));
*str++=(byte)(crc>>8);
*str++=(byte)(crc&0xFF);
byte_to_port(buf,str-buf);
return 1;
}
return 0;
}
void byte_to_port(byte *buf,byte num)
{
char i;
for (i=0;i<num;i++)
putchar(*(buf+i));
}
flash byte aucCRCHi[] = {
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
};
flash byte aucCRCLo[] = {
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
};
word crc16( byte * pucFrame, word usLen )
{
byte ucCRCHi = 0xFF;
byte ucCRCLo = 0xFF;
int iIndex;
while( usLen-- )
{
iIndex = ucCRCLo ^ *( pucFrame++ );
ucCRCLo = ( byte )( ucCRCHi ^ aucCRCHi[iIndex] );
ucCRCHi = aucCRCLo[iIndex];
}
return ( word )( ucCRCHi | ucCRCLo << 8 );
}
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