Infineon TLE984 Series, Руководство пользователя для прошивки

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Firmware User Manual (AE-step) 27 Revision 1.02
2019-04-24
TLE984x Firmware User Manual
4.2 BSL via LIN
The LIN BSL is a LIN-like protocol based on LIN 2.0 (refer to LIN Specification Package documentation,
Revision 2.0, 23 September 2003).
The LIN protocol layer module handles incoming LIN frames. It forwards the given commands and requests to
the BSL protocol layer and is responsible for response message handling.
This layer calls the LIN HAL API to access the LIN hardware module for baud rate management and LIN frame
exchange (transmission & reception).
The LIN interface supports baud rate detection including the standard rates from 9.6 kbit/s to 57.6 kbit/s.
The LIN HAL is described in
“LIN HAL” on Page 36 .
The BSL software module periodically polls the LIN protocol layer to receive incoming frames and send out
available response frames.
The LIN protocol layer parses all incoming LIN frames, it rejects frames with wrong checksum calculation or
invalid NAD values. The checksum calculation algorithm is done according to the LIN 2.0 standard. All received
messages are given to the BSL protocol layer, which concatenates it to complete commands.
Some BSL commands are shorter than the expected LIN frame. Those frames are filled up with dummy bytes.
BootROM reads such dummy bytes during checksum validation, but it ignores them during command
processing. The dummy Bytes in both directions are always set to zero.
Figure 4-6 shows the LIN protocol layer and its interaction with other software modules.
Figure 4-6 LIN Protocol Layer
Figure 4-7 shows the interaction between Hardware and software layers for the BSL LIN mode .
LIN_PROTOCOL_LAYER
.
BSL
Protocol
LIN
Protocol
LIN
HAL
Timer