Table 100. Transmit Mailbox Mapping; Table 101. Receive Mailbox Mapping; Figure 234. Can Error State Diagram - ST STM32F40 Series Reference Manual

Controller area network (bxCAN)

Table 100. Transmit mailbox mapping

Offset to transmit mailbox base address
Receive mailbox
When a message has been received, it is available to the software in the FIFO output
mailbox. Once the software has handled the message (e.g. read it) the software must
release the FIFO output mailbox by means of the RFOM bit in the CAN_RFR register to
make the next incoming message available. The filter match index is stored in the MFMI field
of the CAN_RDTxR register. The 16-bit time stamp value is stored in the TIME[15:0] field of
CAN_RDTxR.

Table 101. Receive mailbox mapping

Offset to receive mailbox base

Figure 234. CAN error state diagram

679/1422
0
4
8
12
address (bytes)
0
4
8
12
ERROR ACTIVE
When 128 * 11 recessive bits occur:
Doc ID 018909 Rev 4
Register name
CAN_TIxR
CAN_TDTxR
CAN_TDLxR
CAN_TDHxR
Register name
CAN_RIxR
CAN_RDTxR
CAN_RDLxR
CAN_RDHxR
When TEC or REC > 127
ERROR PASSIVE
When TEC and REC < 128,
BUS OFF
RM0090
When TEC > 255
ai15903