COMMELL MPX-2515 - Manual (Page 26)

Commell MPX-2515 User’s Guide Rev 0100
Taiwan Commate Computer Inc. 26
#define CCP_CAN_RX_MASKS_FILTERS 0X22
#define MCP_RX_FILTER_5 0X18
#define EP2 2 /* Endpoint 2 */
#define EP3 3 /* Endpoint 3 */
OFFSET BULK OUT (EP2) BULK IN (EP1)
SIZEOF_DATA 0X06 0X01
COMMAND 0X22 0X22
ERROR 0X00 Error code
DATA_0 0X18 Number of bytes written
DATA_1 0X04: Number of bytes
to write. checksum
DATA_2 RXF5SIDH
DATA_3 RXF5SIDL
DATA_4 RXF5EID8
DATA_5 RXF5EID0
DATA_6 checksum
DATA_7
1.8 CCP_CAN_TX Service
1.8.1 Introduction to Message Transmission
TRANSMIT BUFFERS
The MCP2515 implements three transmit buffers. Each of these buffers occupies 14
bytes of SRAM and are mapped into the device memory map.
The first byte, TXBnCTRL, is a control register associated with the message buffer.
The information is this register determines the conditions under which the message
will be transmitted and indicates the status of the message transmission.
Five bytes are used to hold the standard and extended identifiers, as well as other
message arbitration information.
The last eight bytes are for the eight possible data bytes of the message to be
transmitted.
At a minimum, the TXBnSIDH, TXBnSIDL and TXBnDLC registers must be
loaded. If data bytes are present in the message, the TXBnDm registers must also be
loaded. If the message is to use extended identifiers, the TXBnEIDm registers must
aso be loaded and the TXBnSIDL.EXIDE bit set.
TRANSMIT PRIORITY