程序特点
- 不使用while循环
- 速度尽可能快速
- 除去程序运行时间,没有多余等待时间
- 优化CRC校验方式
头文件modbus.h
#ifndef MODBUS_H
#define MODBUS_H
#define ModbusSlaveAddress 1
typedef enum {
MB_FUNC_READ_COIL = 1,
MB_FUNC_READ_INPUT,
MB_FUNC_READ_HOLDINGREGISTERS,
MB_FUNC_READ_INPUTREGISTERS,
MB_FUNC_FORCE_COIL,
MB_FUNC_WRITE_HOLDINGREGISTER,
MB_FUNC_FORCE_NCOILS = 15,
MB_FUNC_WRITE_NREGISTERS = 16
} ModbusFunctionCode;
typedef enum {
MB_ERROR_ILLEGALFUNC = 1,
MB_ERROR_ILLEGALADDR,
MB_ERROR_ILLEGALDATA,
MB_ERROR_SLVFAILURE,
MB_ERROR_ACKNOWLEDGE,
MB_ERROR_SLVBUSY,
MB_ERROR_NEGACKNOWLEDGE,
MB_ERROR_MEMPARITY,
MB_ERROR_GATEWAYPATHUN
} ModbusError;
typedef enum {
MB_CREATE,
MB_START,
MB_TIMER_T35_WAIT,
MB_IDLE,
MB_RECEIVE,
MB_PROCESS,
MB_TRANSMIT,
MB_DESTROY
} ModbusState;
typedef struct ModbusData ModbusData;
struct ModbusData {
Uint16 slaveAddress;
Uint16 functionCode;
Uint32 contentIdx;
Uint32 numofregisters;
Uint16 content[20];
Uint16 size;
Uint16 crc;
};
void KD_Modbus_Init(void);
typedef struct ModbusCoilsMap ModbusCoilsMap;
struct ModbusCoilsMap{
Uint16 dummy1;
Uint16 dummy2;
Uint16 dummy3;
Uint16 dummy4;
Uint16 dummy5;
Uint16 dummy6;
Uint16 dummy7;
Uint16 dummy8;
Uint16 dummy9;
Uint16 dummy10;
Uint16 dummy11;
Uint16 dummy12;
Uint16 dummy13;
Uint16 dummy14;
Uint16 dummy15;
Uint16 dummy16;
Uint16 dummy17;
Uint16 dummy18;
Uint16 dummy19;
Uint16 dummy20;
Uint16 dummy21;
Uint16 dummy22;
Uint16 dummy23;
Uint16 dummy24;
Uint16 dummy25;
Uint16 dummy26;
Uint16 dummy27;
Uint16 dummy28;
Uint16 dummy29;
Uint16 dummy30;
Uint16 dummy31;
Uint16 dummy32;
Uint16 dummy33;
Uint16 dummy34;
Uint16 dummy35;
Uint16 dummy36;
Uint16 dummy37;
Uint16 dummy38;
Uint16 dummy39;
Uint16 dummy40;
};
typedef struct ModbusInputsMap ModbusInputsMap;
struct ModbusInputsMap{
Uint16 dummy1;
Uint16 dummy2;
Uint16 dummy3;
Uint16 dummy4;
Uint16 dummy5;
Uint16 dummy6;
Uint16 dummy7;
Uint16 dummy8;
Uint16 dummy9;
Uint16 dummy10;
Uint16 dummy11;
Uint16 dummy12;
Uint16 dummy13;
Uint16 dummy14;
Uint16 dummy15;
Uint16 dummy16;
Uint16 dummy17;
Uint16 dummy18;
Uint16 dummy19;
Uint16 dummy20;
Uint16 dummy21;
Uint16 dummy22;
Uint16 dummy23;
Uint16 dummy24;
Uint16 dummy25;
Uint16 dummy26;
Uint16 dummy27;
Uint16 dummy28;
Uint16 dummy29;
Uint16 dummy30;
Uint16 dummy31;
Uint16 dummy32;
Uint16 dummy33;
Uint16 dummy34;
Uint16 dummy35;
Uint16 dummy36;
Uint16 dummy37;
Uint16 dummy38;
Uint16 dummy39;
Uint16 dummy40;
};
typedef struct ModbusHoldingRegistersMap ModbusHoldingRegistersMap;
struct ModbusHoldingRegistersMap {
Uint16 dummy1;
Uint16 dummy2;
Uint16 dummy3;
Uint16 dummy4;
Uint16 dummy5;
Uint16 dummy6;
Uint16 dummy7;
Uint16 dummy8;
Uint16 dummy9;
Uint16 dummy10;
Uint16 dummy11;
Uint16 dummy12;
Uint16 dummy13;
Uint16 dummy14;
Uint16 dummy15;
Uint16 dummy16;
Uint16 dummy17;
Uint16 dummy18;
Uint16 dummy19;
Uint16 dummy20;
Uint16 dummy21;
Uint16 dummy22;
Uint16 dummy23;
Uint16 dummy24;
Uint16 dummy25;
Uint16 dummy26;
Uint16 dummy27;
Uint16 dummy28;
Uint16 dummy29;
Uint16 dummy30;
Uint16 dummy31;
Uint16 dummy32;
Uint16 dummy33;
Uint16 dummy34;
Uint16 dummy35;
Uint16 dummy36;
Uint16 dummy37;
Uint16 dummy38;
Uint16 dummy39;
Uint16 dummy40;
};
typedef struct ModbusInputRegistersMap ModbusInputRegistersMap;
struct ModbusInputRegistersMap {
Uint16 dummy1;
Uint16 dummy2;
Uint16 dummy3;
Uint16 dummy4;
Uint16 dummy5;
Uint16 dummy6;
Uint16 dummy7;
Uint16 dummy8;
Uint16 dummy9;
Uint16 dummy10;
Uint16 dummy11;
Uint16 dummy12;
Uint16 dummy13;
Uint16 dummy14;
Uint16 dummy15;
Uint16 dummy16;
Uint16 dummy17;
Uint16 dummy18;
Uint16 dummy19;
Uint16 dummy20;
Uint16 dummy21;
Uint16 dummy22;
Uint16 dummy23;
Uint16 dummy24;
Uint16 dummy25;
Uint16 dummy26;
Uint16 dummy27;
Uint16 dummy28;
Uint16 dummy29;
Uint16 dummy30;
Uint16 dummy31;
Uint16 dummy32;
Uint16 dummy33;
Uint16 dummy34;
Uint16 dummy35;
Uint16 dummy36;
Uint16 dummy37;
Uint16 dummy38;
Uint16 dummy39;
Uint16 dummy40;
};
typedef struct ModbusSlaveStruc{
ModbusState state;
Uint16 rdata[30];
Uint16 sdata[100];
Uint16 recvlen;
Uint16 sendlen;
ModbusCoilsMap coils,*pcoils;
ModbusInputsMap inputs,*pinputs;
ModbusHoldingRegistersMap holdingRegisters,*pholdingRegisters;
ModbusInputRegistersMap inputRegisters,*pinputRegisters;
}MBSLSTRU;
#endif
源文件modbus.c
#include <DSP2833x_Device.h>
#include <DSP2833x_Examples.h>
#include <Modbus.h>
#include <string.h>
MBSLSTRU public_struc_modbus;
void receieve_handler(MBSLSTRU *pModbusSlave);
Uint16 CRC16 (Uint16 *nData, Uint16 wLength);
#define bufferdepth 0x10
__interrupt void scicTxFifoIsr(void)
{
Uint16 i, Temp;
if((public_struc_modbus.sendlen&0xff)>bufferdepth)
{
Temp = bufferdepth;
ScicRegs.SCIFFTX.bit.TXFFIL = 0;
for(i=0; i< Temp; i++)
{
ScicRegs.SCITXBUF = public_struc_modbus.sdata[i + bufferdepth*(public_struc_modbus.sendlen>>12)];
}
public_struc_modbus.sendlen = public_struc_modbus.sendlen - bufferdepth + 0x1000;
}
else
{
Temp = (public_struc_modbus.sendlen&0xff);
if((public_struc_modbus.sendlen&0xff)>0)
{
ScicRegs.SCIFFTX.bit.TXFFIL = 0;
for(i=0; i< Temp; i++)
{
ScicRegs.SCITXBUF = public_struc_modbus.sdata[i + bufferdepth*(public_struc_modbus.sendlen>>12)];
}
public_struc_modbus.sendlen = 0;
}
else
{
if(public_struc_modbus.sendlen==0)
{
ScicRegs.SCIFFTX.bit.TXFFIENA = 0;
}
}
}
ScicRegs.SCIFFTX.bit.TXFFINTCLR=1;
PieCtrlRegs.PIEACK.bit.ACK8=1;
}
__interrupt void scicRxFifoIsr(void)
{
Uint16 i;
if(ScicRegs.SCIFFRX.bit.RXFFIL != 1)
{
if(public_struc_modbus.rdata[1]==0)
{
for(i=1;i<8;i++)
{
public_struc_modbus.rdata[i]=ScicRegs.SCIRXBUF.all;
}
}
if((public_struc_modbus.rdata[1]==15)||(public_struc_modbus.rdata[1]==16))
{
if(public_struc_modbus.recvlen == 0)
{
public_struc_modbus.recvlen = public_struc_modbus.rdata[6] + 9 + 0x1000;
ScicRegs.SCIFFRX.bit.RXFFIL = 8;
i = public_struc_modbus.recvlen&0xff - ((public_struc_modbus.recvlen>>12)*8);
if(i>8)
{ScicRegs.SCIFFRX.bit.RXFFIL = 8;}
else
{ScicRegs.SCIFFRX.bit.RXFFIL = i;}
}
else
{
if((public_struc_modbus.recvlen>>12)<((public_struc_modbus.recvlen&0xFF)/8))
{
for(i=0;i<8;i++)
{
public_struc_modbus.rdata[i+(public_struc_modbus.recvlen>>12)*8]=ScicRegs.SCIRXBUF.all;
}
public_struc_modbus.recvlen = public_struc_modbus.recvlen + 0x1000;
i = public_struc_modbus.recvlen&0xff - ((public_struc_modbus.recvlen>>12)*8);
if(i>8)
{ScicRegs.SCIFFRX.bit.RXFFIL = 8;}
else
{ScicRegs.SCIFFRX.bit.RXFFIL = i;}
}
else
{
for(i=0;i<((public_struc_modbus.recvlen&0xFF)%8);i++)
{
public_struc_modbus.rdata[i+(public_struc_modbus.recvlen>>12)*8]=ScicRegs.SCIRXBUF.all;
}
if((public_struc_modbus.recvlen&0xFF) <= (i+(public_struc_modbus.recvlen>>12)*8))
{
receieve_handler(&public_struc_modbus);
public_struc_modbus.rdata[1] = 0;
ScicRegs.SCIFFRX.bit.RXFFIL = 1;
public_struc_modbus.recvlen = 0;
}
}
}
}
else
{
public_struc_modbus.recvlen = 8;
if((public_struc_modbus.rdata[1]>=1)&&(public_struc_modbus.rdata[1]<=6))
{
receieve_handler(&public_struc_modbus);
public_struc_modbus.rdata[1] = 0;
public_struc_modbus.recvlen = 0;
ScicRegs.SCIFFRX.bit.RXFFIL = 1;
}
else
{
receieve_handler(&public_struc_modbus);
public_struc_modbus.rdata[1] = 0;
ScicRegs.SCIFFRX.bit.RXFFIL = 1;
}
}
}
else
{
public_struc_modbus.rdata[0]=ScicRegs.SCIRXBUF.all;
if(public_struc_modbus.rdata[0] == ModbusSlaveAddress)
{ScicRegs.SCIFFRX.bit.RXFFIL = 7;}
else
{ScicRegs.SCIFFRX.bit.RXFFIL = 1;}
}
ScicRegs.SCIFFRX.bit.RXFFOVRCLR=1;
ScicRegs.SCIFFRX.bit.RXFFINTCLR=1;
PieCtrlRegs.PIEACK.bit.ACK8=1;
}
void KD_Modbus_Init(void)
{
InitScicGpio();
InitSci();
EALLOW;
PieVectTable.SCIRXINTC = &scicRxFifoIsr;
PieVectTable.SCITXINTC = &scicTxFifoIsr;
EDIS;
PieCtrlRegs.PIECTRL.bit.ENPIE = 1;
PieCtrlRegs.PIEIER8.bit.INTx5=1;
PieCtrlRegs.PIEIER8.bit.INTx6=1;
IER|=M_INT8;
public_struc_modbus.recvlen = 0;
public_struc_modbus.sendlen = 0;
Uint16 i, *pcoils_sub, *pinputs_sub, *pholdingRegisters_sub, *pinputRegisters_sub;
public_struc_modbus.pcoils = &public_struc_modbus.coils;
public_struc_modbus.pinputs = &public_struc_modbus.inputs;
public_struc_modbus.pholdingRegisters = &public_struc_modbus.holdingRegisters;
public_struc_modbus.pinputRegisters = &public_struc_modbus.inputRegisters;
pcoils_sub =(Uint16 *) public_struc_modbus.pcoils;
pinputs_sub =(Uint16 *) public_struc_modbus.pinputs;
pholdingRegisters_sub =(Uint16 *) public_struc_modbus.pholdingRegisters;
pinputRegisters_sub =(Uint16 *) public_struc_modbus.pinputRegisters;
for(i=0;i<sizeof(public_struc_modbus.coils);i++)
{(i%2==1)?(*(pcoils_sub+i)=1):(*(pcoils_sub+i)=0);}
for(i=0;i<sizeof(public_struc_modbus.inputs);i++)
{(i%2==0)?(*(pinputs_sub+i)=1):(*(pinputs_sub+i)=0);}
for(i=0;i<sizeof(public_struc_modbus.holdingRegisters);i++)
{*(pholdingRegisters_sub+i)=i+1;}
for(i=0;i<sizeof(public_struc_modbus.inputRegisters);i++)
{*(pinputRegisters_sub+i)=i+1;}
memset(public_struc_modbus.rdata,0,sizeof(public_struc_modbus.rdata));
}
void receieve_handler(MBSLSTRU *pModbusSlave)
{
Uint16 i, lentemp = public_struc_modbus.recvlen & 0xff;
ModbusData pTempData;
Uint16 *pcoils_sub, *pinputs_sub, *pholdingRegisters_sub, *pinputRegisters_sub;
pcoils_sub =(Uint16 *) pModbusSlave->pcoils;
pinputs_sub =(Uint16 *) pModbusSlave->pinputs;
pholdingRegisters_sub =(Uint16 *) pModbusSlave->pholdingRegisters;
pinputRegisters_sub =(Uint16 *) pModbusSlave->pinputRegisters;
memset(pModbusSlave->sdata,0,sizeof(pModbusSlave->sdata));
pTempData.crc = ((pModbusSlave->rdata[lentemp-2])<<8)+pModbusSlave->rdata[lentemp-1];
pModbusSlave->sdata[0] = pModbusSlave->rdata[0];
if(pModbusSlave->rdata[0]==ModbusSlaveAddress)
{
pModbusSlave->sdata[1] = pModbusSlave->rdata[1];
if(CRC16(pModbusSlave->rdata, lentemp-2) == pTempData.crc)
{
pTempData.contentIdx = (pModbusSlave->rdata[2]<<8)+pModbusSlave->rdata[3];
pTempData.numofregisters = (pModbusSlave->rdata[4]<<8)+pModbusSlave->rdata[5];
if((pTempData.contentIdx+pTempData.numofregisters)>40)
{
pModbusSlave->sdata[1]|= 0x80;
pModbusSlave->sdata[2]|= 0x03;
i=CRC16(pModbusSlave->sdata, 3);
pModbusSlave->sdata[3]= (i>>8)&0xff;
pModbusSlave->sdata[4]= i&0xff;
pModbusSlave->sendlen=5;
ScicRegs.SCIFFTX.bit.TXFFIL = pModbusSlave->sendlen;
ScicRegs.SCIFFTX.bit.TXFFIENA = 1;
}
else
{
switch(pModbusSlave->rdata[1])
{
case MB_FUNC_READ_COIL:
pModbusSlave->sdata[2] = (pTempData.numofregisters+7)/8;
for(i=0;i<pTempData.numofregisters;i++)
{
pModbusSlave->sdata[3+(i/8)] |= (*(pcoils_sub+i+pTempData.contentIdx) << (i%8));
}
i=CRC16(pModbusSlave->sdata, pModbusSlave->sdata[2]+3);
pModbusSlave->sdata[2+pModbusSlave->sdata[2]+1]=(i>>8)&0xff;
pModbusSlave->sdata[2+pModbusSlave->sdata[2]+2]=i&0xff;
pModbusSlave->sendlen= pModbusSlave->sendlen + 5 + pModbusSlave->sdata[2];
if(pModbusSlave->sendlen > bufferdepth)
{ScicRegs.SCIFFTX.bit.TXFFIL = bufferdepth;}
else
{ScicRegs.SCIFFTX.bit.TXFFIL = pModbusSlave->sendlen;}
ScicRegs.SCIFFTX.bit.TXFFIENA = 1;
break;
case MB_FUNC_READ_INPUT:
pModbusSlave->sdata[2] = (pTempData.numofregisters+7)/8;
for(i=0;i<pTempData.numofregisters;i++)
{
pModbusSlave->sdata[3+(i/8)]|=*(pinputs_sub+i+pTempData.contentIdx) << (i%8);
}
i=CRC16(pModbusSlave->sdata, pModbusSlave->sdata[2]+3);
pModbusSlave->sdata[2+pModbusSlave->sdata[2]+1]=(i>>8)&0xff;
pModbusSlave->sdata[2+pModbusSlave->sdata[2]+2]=i&0xff;
pModbusSlave->sendlen= pModbusSlave->sendlen + 5 + pModbusSlave->sdata[2];
if(pModbusSlave->sendlen > bufferdepth)
{ScicRegs.SCIFFTX.bit.TXFFIL = bufferdepth;}
else
{ScicRegs.SCIFFTX.bit.TXFFIL = pModbusSlave->sendlen;}
ScicRegs.SCIFFTX.bit.TXFFIENA = 1;
break;
case MB_FUNC_READ_HOLDINGREGISTERS:
pModbusSlave->sdata[2] = pTempData.numofregisters*2;
for(i=0;i<(pTempData.numofregisters);i++)
{
pModbusSlave->sdata[3+i*2+1]=*(pholdingRegisters_sub+i+pTempData.contentIdx) ;
pModbusSlave->sdata[3+i*2+1] = (pModbusSlave->sdata[3+i*2+1]) & 0xff;
pModbusSlave->sdata[3+i*2]=*(pholdingRegisters_sub+i+pTempData.contentIdx) ;
pModbusSlave->sdata[3+i*2]=(pModbusSlave->sdata[3+i*2])>>8;
}
i=CRC16(pModbusSlave->sdata, pModbusSlave->sdata[2]+3);
pModbusSlave->sdata[2+pModbusSlave->sdata[2]+1]=(i>>8)&0xff;
pModbusSlave->sdata[2+pModbusSlave->sdata[2]+2]=i&0xff;
pModbusSlave->sendlen= pModbusSlave->sendlen + 5 + pModbusSlave->sdata[2];
if(pModbusSlave->sendlen > bufferdepth)
{ScicRegs.SCIFFTX.bit.TXFFIL = bufferdepth;}
else
{ScicRegs.SCIFFTX.bit.TXFFIL = pModbusSlave->sendlen;}
ScicRegs.SCIFFTX.bit.TXFFIENA = 1;
break;
case MB_FUNC_READ_INPUTREGISTERS:
pModbusSlave->sdata[2] = pTempData.numofregisters*2;
for(i=0;i<(pTempData.numofregisters);i++)
{
pModbusSlave->sdata[3+i*2+1]=*(pinputRegisters_sub+i+pTempData.contentIdx) ;
pModbusSlave->sdata[3+i*2+1] = (pModbusSlave->sdata[3+i*2+1]) & 0xff;
pModbusSlave->sdata[3+i*2]=*(pinputRegisters_sub+i+pTempData.contentIdx) ;
pModbusSlave->sdata[3+i*2]=(pModbusSlave->sdata[3+i*2])>>8;
}
i=CRC16(pModbusSlave->sdata, pModbusSlave->sdata[2]+3);
pModbusSlave->sdata[2+pModbusSlave->sdata[2]+1]=(i>>8)&0xff;
pModbusSlave->sdata[2+pModbusSlave->sdata[2]+2]=i&0xff;
pModbusSlave->sendlen= pModbusSlave->sendlen + 5 + pModbusSlave->sdata[2];
if(pModbusSlave->sendlen > bufferdepth)
{ScicRegs.SCIFFTX.bit.TXFFIL = bufferdepth;}
else
{ScicRegs.SCIFFTX.bit.TXFFIL = pModbusSlave->sendlen;}
ScicRegs.SCIFFTX.bit.TXFFIENA = 1;
break;
case MB_FUNC_FORCE_COIL:
for(i=2;i<8;i++)
{
pModbusSlave->sdata[i] = pModbusSlave->rdata[i];
}
if(pTempData.numofregisters==0xFF00)
{
*(pcoils_sub+pTempData.contentIdx)=1;
pModbusSlave->sendlen=8;
}
else
{
if(pTempData.numofregisters==0x0000)
{
*(pcoils_sub+pTempData.contentIdx)=0;
pModbusSlave->sendlen=8;
}
else
{
pModbusSlave->sdata[1]= 0x85;
pModbusSlave->sdata[2]= 0x03;
i=CRC16(pModbusSlave->sdata, 3);
pModbusSlave->sdata[3]= (i>>8)&0xff;
pModbusSlave->sdata[4]= i&0xff;
pModbusSlave->sendlen=5;
}
}
ScicRegs.SCIFFTX.bit.TXFFIL = pModbusSlave->sendlen;
ScicRegs.SCIFFTX.bit.TXFFIENA = 1;
break;
case MB_FUNC_WRITE_HOLDINGREGISTER:
for(i=2;i<8;i++)
{
pModbusSlave->sdata[i] = pModbusSlave->rdata[i];
}
*(pholdingRegisters_sub+pTempData.contentIdx)=pTempData.numofregisters;
pModbusSlave->sendlen=8;
ScicRegs.SCIFFTX.bit.TXFFIL = pModbusSlave->sendlen;
ScicRegs.SCIFFTX.bit.TXFFIENA = 1;
break;
case MB_FUNC_FORCE_NCOILS:
for(i=0;i<pTempData.numofregisters;i++)
{
*(pcoils_sub+i+pTempData.contentIdx) = ((pModbusSlave->rdata[i/8+7])>>(i%8))&0x01;
}
for(i=2;i<7;i++)
{
pModbusSlave->sdata[i] = pModbusSlave->rdata[i];
}
i=CRC16(pModbusSlave->sdata, 7);
pModbusSlave->sdata[7]=(i>>8)&0xff;
pModbusSlave->sdata[8]=i&0xff;
pModbusSlave->sendlen=9;
ScicRegs.SCIFFTX.bit.TXFFIL = pModbusSlave->sendlen;
ScicRegs.SCIFFTX.bit.TXFFIENA = 1;
break;
case MB_FUNC_WRITE_NREGISTERS:
for(i=0;i<pTempData.numofregisters;i++)
{
*(pholdingRegisters_sub+i+pTempData.contentIdx) =(Uint16)(pModbusSlave->rdata[i*2+7]<<8) + (pModbusSlave->rdata[i*2+8]&0xFF);
}
for(i=2;i<6;i++)
{
pModbusSlave->sdata[i] = pModbusSlave->rdata[i];
}
i=CRC16(pModbusSlave->sdata, 6);
pModbusSlave->sdata[6]=(i>>8)&0xff;
pModbusSlave->sdata[7]=i&0xff;
pModbusSlave->sendlen=8;
ScicRegs.SCIFFTX.bit.TXFFIL = pModbusSlave->sendlen;
ScicRegs.SCIFFTX.bit.TXFFIENA = 1;
break;
default:
pModbusSlave->sdata[2]= 0x03;
i=CRC16(pModbusSlave->sdata, 3);
pModbusSlave->sdata[3]= (i>>8)&0xff;
pModbusSlave->sdata[4]= i&0xff;
pModbusSlave->sendlen=5;
ScicRegs.SCIFFTX.bit.TXFFIL = pModbusSlave->sendlen;
ScicRegs.SCIFFTX.bit.TXFFIENA = 1;
break;
}
}
}
else
{
pModbusSlave->sdata[1]|= 0x80;
pModbusSlave->sdata[2]|= 0x03;
i=CRC16(pModbusSlave->sdata, 3);
pModbusSlave->sdata[3]= (i>>8)&0xff;
pModbusSlave->sdata[4]= i&0xff;
pModbusSlave->sendlen=5;
ScicRegs.SCIFFTX.bit.TXFFIL = pModbusSlave->sendlen;
ScicRegs.SCIFFTX.bit.TXFFIENA = 1;
}
}
else
{ }
}
Uint16 CRC16 (Uint16 *nData, Uint16 wLength)
{
static const Uint16 wCRCTable[] = {
0X0000, 0XC0C1, 0XC181, 0X0140, 0XC301, 0X03C0, 0X0280, 0XC241,
0XC601, 0X06C0, 0X0780, 0XC741, 0X0500, 0XC5C1, 0XC481, 0X0440,
0XCC01, 0X0CC0, 0X0D80, 0XCD41, 0X0F00, 0XCFC1, 0XCE81, 0X0E40,
0X0A00, 0XCAC1, 0XCB81, 0X0B40, 0XC901, 0X09C0, 0X0880, 0XC841,
0XD801, 0X18C0, 0X1980, 0XD941, 0X1B00, 0XDBC1, 0XDA81, 0X1A40,
0X1E00, 0XDEC1, 0XDF81, 0X1F40, 0XDD01, 0X1DC0, 0X1C80, 0XDC41,
0X1400, 0XD4C1, 0XD581, 0X1540, 0XD701, 0X17C0, 0X1680, 0XD641,
0XD201, 0X12C0, 0X1380, 0XD341, 0X1100, 0XD1C1, 0XD081, 0X1040,
0XF001, 0X30C0, 0X3180, 0XF141, 0X3300, 0XF3C1, 0XF281, 0X3240,
0X3600, 0XF6C1, 0XF781, 0X3740, 0XF501, 0X35C0, 0X3480, 0XF441,
0X3C00, 0XFCC1, 0XFD81, 0X3D40, 0XFF01, 0X3FC0, 0X3E80, 0XFE41,
0XFA01, 0X3AC0, 0X3B80, 0XFB41, 0X3900, 0XF9C1, 0XF881, 0X3840,
0X2800, 0XE8C1, 0XE981, 0X2940, 0XEB01, 0X2BC0, 0X2A80, 0XEA41,
0XEE01, 0X2EC0, 0X2F80, 0XEF41, 0X2D00, 0XEDC1, 0XEC81, 0X2C40,
0XE401, 0X24C0, 0X2580, 0XE541, 0X2700, 0XE7C1, 0XE681, 0X2640,
0X2200, 0XE2C1, 0XE381, 0X2340, 0XE101, 0X21C0, 0X2080, 0XE041,
0XA001, 0X60C0, 0X6180, 0XA141, 0X6300, 0XA3C1, 0XA281, 0X6240,
0X6600, 0XA6C1, 0XA781, 0X6740, 0XA501, 0X65C0, 0X6480, 0XA441,
0X6C00, 0XACC1, 0XAD81, 0X6D40, 0XAF01, 0X6FC0, 0X6E80, 0XAE41,
0XAA01, 0X6AC0, 0X6B80, 0XAB41, 0X6900, 0XA9C1, 0XA881, 0X6840,
0X7800, 0XB8C1, 0XB981, 0X7940, 0XBB01, 0X7BC0, 0X7A80, 0XBA41,
0XBE01, 0X7EC0, 0X7F80, 0XBF41, 0X7D00, 0XBDC1, 0XBC81, 0X7C40,
0XB401, 0X74C0, 0X7580, 0XB541, 0X7700, 0XB7C1, 0XB681, 0X7640,
0X7200, 0XB2C1, 0XB381, 0X7340, 0XB101, 0X71C0, 0X7080, 0XB041,
0X5000, 0X90C1, 0X9181, 0X5140, 0X9301, 0X53C0, 0X5280, 0X9241,
0X9601, 0X56C0, 0X5780, 0X9741, 0X5500, 0X95C1, 0X9481, 0X5440,
0X9C01, 0X5CC0, 0X5D80, 0X9D41, 0X5F00, 0X9FC1, 0X9E81, 0X5E40,
0X5A00, 0X9AC1, 0X9B81, 0X5B40, 0X9901, 0X59C0, 0X5880, 0X9841,
0X8801, 0X48C0, 0X4980, 0X8941, 0X4B00, 0X8BC1, 0X8A81, 0X4A40,
0X4E00, 0X8EC1, 0X8F81, 0X4F40, 0X8D01, 0X4DC0, 0X4C80, 0X8C41,
0X4400, 0X84C1, 0X8581, 0X4540, 0X8701, 0X47C0, 0X4680, 0X8641,
0X8201, 0X42C0, 0X4380, 0X8341, 0X4100, 0X81C1, 0X8081, 0X4040 };
Uint16 nTemp;
Uint16 wCRCWord = 0xFFFF;
while (wLength--)
{
nTemp = (*nData++ ^ wCRCWord)&0xff;
wCRCWord >>= 8;
wCRCWord ^= wCRCTable[nTemp];
}
wCRCWord = (Uint16) ((wCRCWord<<8)+(wCRCWord>>8));
return wCRCWord;
}
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