Exemplo n.º 1
0
/*
** ===================================================================
**     Method      :  Accel_RecvBlock (component InternalI2C)
**     Description :
**         When working as a MASTER, this method writes one (7-bit
**         addressing) or two (10-bit addressing) slave address bytes
**         inclusive of R/W bit = 1 to the I2C bus, then reads the
**         block of characters from the bus and then sends the stop
**         condition. The slave address must be specified before, by
**         the "SelectSlave" or "SelectSlave10" method or in component
**         initialization section, "Target slave address init" property.
**         If interrupt service is enabled and the method returns
**         ERR_OK, it doesn't mean that transmission was finished
**         successfully. The state of transmission must be tested by
**         means of events (OnReceiveData, OnError or OnArbitLost). In
**         case of successful transmission, received data is ready
**         after OnReceiveData event is called. 
**         When working as a SLAVE, this method reads a block of
**         characters from the input slave buffer.
**     Parameters  :
**         NAME            - DESCRIPTION
**       * Ptr             - A pointer to the block space for received
**                           data.
**         Siz             - The size of the block.
**       * Rcv             - Amount of received data. In master mode,
**                           if interrupt support is enabled, the
**                           parameter always returns the same value as
**                           the parameter 'Siz' of this method.
**     Returns     :
**         ---             - Error code, possible codes:
**                           ERR_OK - OK
**                           ERR_SPEED - This device does not work in
**                           the active speed mode
**                           ERR_DISABLED -  Device is disabled
**                           ERR_BUSY - The slave device is busy, it
**                           does not respond by an acknowledge (only in
**                           master mode and when interrupt service is
**                           disabled)
**                           ERR_BUSOFF - Clock timeout elapsed or
**                           device cannot receive data
**                           ERR_RXEMPTY - The receive buffer didn't
**                           contain the requested number of data. Only
**                           available data (or no data) has been
**                           returned  (slave mode only).
**                           ERR_OVERRUN - Overrun error was detected
**                           from last character or block receiving
**                           (slave mode only)
**                           ERR_ARBITR - Arbitration lost (only when
**                           interrupt service is disabled and in master
**                           mode)
**                           ERR_NOTAVAIL - Method is not available in
**                           current mode - see the comment in the
**                           generated code.
** ===================================================================
*/
byte Accel_RecvBlock(void* Ptr,word Siz,word *Rcv)
{
  LDD_TError Error;
  LDD_I2C_TErrorMask ErrorMask;
  LDD_I2C_TBusState BusState;
  word TmpRcv = 0x00U;
  word Tr;

  if (Siz == 0U) {                     /* Test variable Size on zero */
    *Rcv = 0U;
    return ERR_OK;                     /* If zero then OK */
  }
  Error = IntI2cLdd1_MasterReceiveBlock(IntI2cLdd1_DeviceDataPtr, (LDD_TData *)Ptr, (LDD_I2C_TSize)Siz, LDD_I2C_SEND_STOP); /* Receive a data block */
  if (Error == ERR_BUSY) {
    return ERR_BUSOFF;
  }
  for (Tr=0U; Tr<0x2710U; Tr++) {
    IntI2cLdd1_Main(IntI2cLdd1_DeviceDataPtr); /* Call main communication method */
    if (IntI2cLdd1_MasterGetBlockReceivedStatus(IntI2cLdd1_DeviceDataPtr)) { /* Are all a data received? */
      break;
    }
    if (TmpRcv != (word)IntI2cLdd1_MasterGetReceivedDataNum(IntI2cLdd1_DeviceDataPtr)) { /* Is a data byte received? */
      Tr = (word)-1;                   /* Clear trials counter */
      TmpRcv = (word)IntI2cLdd1_MasterGetReceivedDataNum(IntI2cLdd1_DeviceDataPtr); /* Set TmpRcv on a new value */
    }
  }
  *Rcv = (word)IntI2cLdd1_MasterGetReceivedDataNum(IntI2cLdd1_DeviceDataPtr); /* Return received data number */
  (void)IntI2cLdd1_GetError(IntI2cLdd1_DeviceDataPtr, &ErrorMask);
  if (ErrorMask != 0U) {               /* Is any error detected after transfer? */
    if ((ErrorMask & LDD_I2C_MASTER_NACK) != 0U) { /* If yes, decode error and return error code */
      return ERR_BUSY;
    } else if ((ErrorMask & LDD_I2C_ARBIT_LOST) != 0U) {
      return ERR_ARBITR;
    }
  }
  if (Tr == 0x2710U) {                 /* Is Tr == 'Polling trials'? */
    return ERR_BUSOFF;                 /* Return with error */
  }
  for (Tr=0U; Tr<0x2710U; Tr++) {
    (void)IntI2cLdd1_CheckBus(IntI2cLdd1_DeviceDataPtr, &BusState); /* Get bus state */
    if (BusState == LDD_I2C_IDLE) {    /* Is stop condition generated after transfer? */
      return ERR_OK;                   /* Return ERR_OK */
    }
  }
  return ERR_BUSOFF;                   /* Return error */
}
Exemplo n.º 2
0
/*
** ===================================================================
**     Method      :  CI2C1_GetCharsInRxBuf (component InternalI2C)
**     Description :
**         Returns number of characters in the input buffer. In SLAVE
**         mode returns the number of characters in the internal slave
**         input buffer. In MASTER mode returns number of characters to
**         be received into a user buffer (passed by RecvChar or
**         RecvBlock method).
**         This method is not supported in polling mode.
**     Parameters  : None
**     Returns     :
**         ---             - Number of characters in the input buffer.
** ===================================================================
*/
word CI2C1_GetCharsInRxBuf(void)
{
  return (word)(IntI2cLdd1_MasterGetReceivedDataNum(IntI2cLdd1_DeviceDataPtr)); /* Return number of chars in the Master Rx buffer */
}