modbus_sever.c

458通讯

/*============================================================================*/
//CRC Tables

unsigned char const auchCRCHi_exp[] PROGMEM  = {
   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
} ;

unsigned char const auchCRCLo_exp[] PROGMEM =  {
   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
} ;

/*============================================================================*/
// Procedure to check the checksum of the message
UINT16 modrtuChecksum ( BYTE *chkbuf, BYTE len )
{

   BYTE    uchCRCHi = 0xff ;
   BYTE    uchCRCLo = 0xff ;
   UINT16  uIndex ;
   UINT16  temp_code;

   while ( len )
      {
      uIndex = (UINT16) ( uchCRCHi ^ *chkbuf++ ) ;

      uchCRCHi = (BYTE) ( uchCRCLo ^ auchCRCHi_exp[uIndex] ) ;
      uchCRCLo = auchCRCLo_exp[uIndex] ;
      len-- ;
      }
   temp_code = (UINT16) uchCRCHi;
   temp_code = (UINT16) (temp_code << 8);
   return(UINT16) (  temp_code | uchCRCLo ) ;
}
/*============================================================================*/
// Builds the modbus message
VOID build_modbus_poll ( BYTE node_id, BYTE function, UINT16 address, INT16 amount )
{
   UINT16 crc ;

   /******************************************************************/
   /*      NODE ID TO MESSAGE                                        */
   /******************************************************************/
   UART_TX_Buffer[0]=node_id;
   /******************************************************************/
   /*      FUNCTION TO MESSAGE                                       */
   /******************************************************************/
   UART_TX_Buffer[1]=function;
   /******************************************************************/
   /*      ADDRESS TO MESSAGE HIGH THEN LOW                          */
   /******************************************************************/
   UART_TX_Buffer[2]=(BYTE)((address>>8)&0xff) ;
   UART_TX_Buffer[3]=(BYTE)((address)&0xff) ;
   /******************************************************************/
   /*      LENGTH/DATA TO MESSAGE HIGH THEN LOW                      */
   /******************************************************************/
   UART_TX_Buffer[4]=(BYTE)((amount>>8)&0xff) ;
   UART_TX_Buffer[5]=(BYTE)((amount)&0xff) ;
   /******************************************************************/
   /*      CHECKSUM TO MESSAGE  HIGH THEN LOW                        */
   /******************************************************************/
   crc = modrtuChecksum (UART_TX_Buffer, 6) ;
   UART_TX_Buffer[6]=(BYTE)((crc >> 8) & 0xff) ;
   UART_TX_Buffer[7]=(BYTE)((crc) & 0xff) ;

   current_node_ref=node_id;

   (VOID)sioapi_puts(P6720SER2,(BYTE *) UART_TX_Buffer,8);
}
BYTE sioapi_puts ( UINT port_handle, BYTE *str, UINT length )
{
   UARTIntPutString(port_handle,str,length);
   return 0;

}
/*********************************************************************
 * Function:            BYTE UARTIntPutString(BYTE*)
 * PreCondition:        UARTIntInit()function should have been called.
 * Input:               BYTE pointer
 * Output:              BYTE
 *                            1 - string is successfully
 *                                added to transmit buffer.
 *                            0 - transmit buffer is full and the
 *                                character could not be added to
 *                                transmit buffer.
 *
 * Side Effects:        None
 * Stack Requirements:  1 level deep
 * Overview:            This function puts the data in to transmit
 *                      buffer. Internal implementation wise ,
 *                      it places the argument data in transmit buffer
 *                      and updates the data count and write pointer
 *                      variables.
 *
 ********************************************************************/
BYTE UARTIntPutString(UINT iport, BYTE *stCharData, UINT length)
{

   tx_status *tx_vUARTIntStatus ;

   UINT i;
   BYTE bytetosend;

   mCheckPortHandle(iport);

   if (iport==(UINT)P6720SER1)
      {
      tx_vUARTIntStatus = &tx_vUARTIntStatus1 ;
      }
   else
      {
      tx_vUARTIntStatus = &tx_vUARTIntStatus2 ;
      }


   // Check if TX_BUFFER already full
   if ( tx_vUARTIntStatus->UARTIntTxBufferFull )
      {
      //todo : Flag an error,
      return CD_ERROR ;
      }

   //critical code , disable interrupts

   if ( iport == (UINT)P6720SER1 )
      {
      PIE1bits.TXIE = 0;
#if ( ENABLE_SER1_RS485 == 'Y' )
      Delay1KTCYx (1) ;   // at 10 Mhz, 1000 instruction cycles delay for 0.4 ms.
      mSetRS485_RTSHigh ( P6720SER1 ) ;
#endif
      }
   else if ( iport == (UINT)P6720SER2 )
      {
      PIE3bits.TX2IE = 0;
#if ( ENABLE_SER2_RS485 == 'Y' )
      Delay1KTCYx (1) ;   // at 10 Mhz, 1000 instruction cycles delay for 0.4 ms.
      mSetRS485_RTSHigh ( P6720SER2 ) ;
#endif
      }

   // Put data in TX_BUFFER
   for ( i=0; i < length; i++ )
      {
      tx_vUARTIntStatus->vUARTIntTxBuffer[tx_vUARTIntStatus->vUARTIntTxBufWrPtr] = stCharData[i];
      tx_vUARTIntStatus->UARTIntTxBufferEmpty = 0;
      tx_vUARTIntStatus->vUARTIntTxBufDataCnt ++;
      if ( tx_vUARTIntStatus->vUARTIntTxBufDataCnt == (BYTE)TX_BUFFER_SIZE )
         {
         tx_vUARTIntStatus->UARTIntTxBufferFull = 1;
         break; // Else we will overrun our buffers
         }

      tx_vUARTIntStatus->vUARTIntTxBufWrPtr++;
      if ( tx_vUARTIntStatus->vUARTIntTxBufWrPtr == (BYTE)TX_BUFFER_SIZE )
         {
         tx_vUARTIntStatus->vUARTIntTxBufWrPtr = 0;
         }
      }


   if ( iport == (UINT)P6720SER1 )
      {
      PIE1bits.TXIE = 1;
      }
   else if ( iport == (UINT)P6720SER2 )
      {
      PIE3bits.TX2IE = 1;
      }

   return 1;
}
/*********************************************************************
 * Function:            VOID UARTIntInit(VOID)
 * PreCondition:        None
 * Input:               None
 * Output:              None
 * Side Effects:        None
 * Stack Requirements:  1 level deep
 * Overview:            This function initialises UART peripheral.This
 *                      function need to be called before using
 *                      UARTIntPutChar and UARTIntGetChar functions to
 *                      send and receive the characters.
 ********************************************************************/
VOID UARTIntInit ( UINT iport)
{

   tx_status *tx_vUARTIntStatus ;
   rx_status *rx_vUARTIntStatus ;
   mCheckPortHandle(iport);

   if (iport==(UINT)P6720SER1)
      {
      tx_vUARTIntStatus = &tx_vUARTIntStatus1 ;
      rx_vUARTIntStatus = &rx_vUARTIntStatus1 ;
      }
   else
      {
      tx_vUARTIntStatus = &tx_vUARTIntStatus2 ;
      rx_vUARTIntStatus = &rx_vUARTIntStatus2 ;
      }

   // Intialising the status variables and circular buffer
   // variables .
   tx_vUARTIntStatus->UARTIntTxBufferFull = 0;
   tx_vUARTIntStatus->UARTIntTxBufferEmpty = 1;
   tx_vUARTIntStatus->vUARTIntTxBufDataCnt = 0;
   tx_vUARTIntStatus->vUARTIntTxBufWrPtr = 0;
   tx_vUARTIntStatus->vUARTIntTxBufRdPtr = 0;

   rx_vUARTIntStatus->UARTIntRxBufferFull = 0;
   rx_vUARTIntStatus->UARTIntRxBufferEmpty = 1;
   rx_vUARTIntStatus->UARTIntRxError = 0;
   rx_vUARTIntStatus->UARTIntRxOverFlow = 0;
   rx_vUARTIntStatus->vUARTIntRxBufDataCnt = 0;
   rx_vUARTIntStatus->vUARTIntRxBufWrPtr = 0;
   rx_vUARTIntStatus->vUARTIntRxBufRdPtr = 0;

   if ( iport == (UINT)P6720SER1 )
      {
      /* Initialising BaudRate value */
      TXSTAbits.BRGH = BRGH_VAL;
      mSetUARTPort ( iport, DEFAULT_UART_BAUDRATE, 0) ;

      /* Setting priority */
      IPR1bits.TXIP = 1;
      IPR1bits.RCIP = 1;

      /* Enabling Transmitter or Receiver */
      TXSTAbits.TXEN = 1;
      RCSTAbits.CREN = 1;

      /* Enabling Serial Port */
      RCSTAbits.SPEN = 1;

      /* Enable the TX and RX. Interrupt */
      PIE1bits.RCIE = 1;

      /* Initialising TX/RX port pins */
      DDRCbits.RC6 = 0;
      DDRCbits.RC7 = 1;

      /*Setting RTS pin as output, and low */
      PORTCbits.RC5 = 0 ;
      DDRCbits.RC5  = 0;
      }
   else
      {
      /* Initialising BaudRate value */
      TXSTA2bits.BRGH = BRGH_VAL;
      mSetUARTPort ( iport, DEFAULT_UART_BAUDRATE, 0) ;

      /* Setting priority */
      IPR3bits.TX2IP = 1;
      IPR3bits.RC2IP = 1;

      /* Enabling Transmitter or Receiver */
      TXSTA2bits.TXEN = 1;
      RCSTA2bits.CREN = 1;

      /* Enabling Serial Port */
      RCSTA2bits.SPEN = 1;

      /* Enable the TX and RX. Interrupt */
      PIE3bits.RC2IE = 1;

      /* Initialising TX/RX port pins */
      DDRGbits.RG1 = 0;
      DDRGbits.RG2 = 1;

      /*Setting RTS pin as output, and low */
      PORTGbits.RG3 = 0 ;
      DDRGbits.RG3  = 0;
      }

   /*Enable priority interrupts*/
   RCONbits.IPEN = 1;

   /* Setting Global interrupt pins */
   INTCONbits.GIEH = 1;
   INTCONbits.GIEL = 1;


}