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Each element stores information about transmitted messages. By reading the Tx Event FIFO the Host CPU gets this information in the order the messages were transmitted. Status information about the Tx Event FIFO can be obtained from the MCAN_TXEFS register.
Figure 12-2118 shows Tx Event FIFO element structure.
Table 12-4112 shows Tx Event FIFO element field descriptions.
Word | Bits | Field Name | Description | ||
---|---|---|---|---|---|
E0 | 31 | ESI | Error State Indicator
| ||
30 | XTD | Extended Identifier
| |||
29 | RTR | Remote Transmission Request
| |||
28-0 | ID[28-0] | Identifier Standard or extended identifier depending on XTD bit. A standard identifier has to be written to ID[28-18]. | |||
E1 | 31-24 | MM[7-0] | Message Marker Copied from Tx Buffer into Tx Event FIFO element for identification of Tx message status (see also MM[7-0] field in Table 12-4111). | ||
23-22 | ET[1-0] | Event Type
| |||
21 | FDF | FD Format
| |||
20 | BRS | Bit Rate Switch
| |||
19-16 | DLC[3-0] | Data Length Code
| |||
15-0 | TXTS[15-0] | Tx Timestamp Timestamp Counter value captured on start of frame transmission. Resolution depending on configuration of the Timestamp Counter Prescaler MCAN_TSCC[19-16] TCP field. |