Driver documentation for TEWS IP810 module

For a functional description click here

Data structure

typedef struct
{
  short int	RW;            /* Mode in which Channel was opened */
  short int 	ID;            /* ID on which I/O is to happen */
  short int	Options;       /* 0 or CAN_REMOTE */
  char		Length, _1;    /* # of data bytes */
  char		Data[8];	/* at the moment only ONE message! */
} CAN_DATA;			/* 16 Bytes length */

External Variables

• MonitorCANBus
  This variable is set to OK(0x0) to display all messages received from the CAN bus, and ERROR(0xff) otherwise.
  Startup Value is ERROR.

  CAN_Show_Ids

  This variable is set to OK(0x0) to display all messages received from the CAN bus without open READ requests, and ERROR(0xff) otherwise.

  Startup Value is ERROR.

External functions

• CanTiming(char slot, uint BusSpeed)
  This function allows to set the Busspeed for the specified slot to the specified value in kBit/s.

  CANStatus(char slot)

  This function displays the registers of the CAN Controller on the specified slot.

Defined Control Codes

The Control Codes are only sent to the driver on IO Commands, not on OPEN or CLOSE Commands. So the process of opening is achieved via calling the IO Command with the appropriate Control Code. See CDI Driver intro!

OPEN Control Codes

   Read Codes: 	X : exclusive READ
   		W : wait for next CAN message
		R : READ with REMOTE FRAME
		AB: Read all Messages for ID not opened for READ!

CAN_CC_OPEN_R
CAN_CC_OPEN_R_X
CAN_CC_OPEN_R_W
CAN_CC_OPEN_R_WX
CAN_CC_OPEN_R_R
CAN_CC_OPEN_R_RX
CAN_CC_OPEN_AB

   Write Codes: X : exclusive WRITE


CAN_CC_OPEN_W
CAN_CC_OPEN_W_X

IO Codes

CAN_CC_R
CAN_CC_W

CLOSE Codes:

CAN_CC_CLOSE

Dummy Code

CAN_CC_NONE

Options

CAN_REMOTE

Startup Function call

void CANdriver();