COMMELL MPX-2515 - Manual (Page 16)

Commell MPX-2515 User’s Guide Rev 0100
Taiwan Commate Computer Inc. 16
contains Data Length Code (DLC) bits that tell valid bytes in this message. All
message bytes are then followed.
Please be noted that CCP provides a way that application can check the status of
this FMB. Application issues an INTERRUPT IN transaction over endpoint 3 to
retrieve an eight bytes Status Packet, which contains FMB status byte at the offset
3 (zero-based packet). Please refer to the INTERRUPT IN section for detail
definitions.
Below is the suggestion of control flow.
1. Issue INTERRUPT IN transaction over endpoint 3.
2. Check FMB Status byte (at offset 3)
3. Issue BULK IN on endpoint 4 to retrieve 64-byte FMB
4. Process message(s)
5. Go back to Step 1.
The following table defines the format of Firmware Messages Buffer. Please refer
to the MCP2515 data sheet for detail definition of MCP2515 registers values in the
FMB.
OFFSET NAME DESCRIPTION
0 RXB_HEADER_MSB The value of 0X5A
1 RXB_HEADER_LSB The value of 0X6B
2 RXB_NEXT Next available buffer (0, 1, 2)
Buffer 0 Start
3 RXB0 / RXB1 0X60 / 0X70
4 RXBnCTRL See below notes.
5 EFLG See below notes.
6 Timestamp + 3 Timestamp LSB
7 Timestamp + 2
8 Timestamp + 1
9 Timestamp + 0 Timestamp MSB
10 RXBnSIDH
11 RXBnSIDL
12 RXBnEID8
13 RXBnEID0
14 RXBnDLC
15 RXBnD0
16 RXBnD1
17 RXBnD2
18 RXBnD3