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TC1784
FlexRay™ Protocol Controller (E-Ray)
User´s Manual
20-224
V1.1, 2011-05
E-Ray, V3.13
•
Configure the Message Buffer as transmit buffer by writing bit CFG = 1 in the Write
Header Section 1 register
•
Write transmit message (Header and Data Section) to the Input Buffer.
•
To transfer a transmit message from Input Buffer to the Message RAM proceed as
described on
“Data Transfer from Input Buffer to Message RAM” on
.
•
If configured in the Input Buffer Command Mask register the Transmission Request
flag for the respective Message Buffer will be set as soon as the transfer has
completed, and the Message Buffer is ready for transmission.
•
Check whether the Message Buffer has been transmitted by checking the TXR bits
(TXR = 0) in the Transmission Request 1,2 registers (single-shot mode only).
In single-shot mode the Communication Controller resets the TXR flag after transmission
has been completed. Now the Host may update the transmit buffer with the next
message. The Communication Controller does not transmit the message before the Host
has indicated that the update is completed by setting the Transmission Request flag TXR
again. The Host can check the actual state of the TXR flags of all Message Buffers by
reading the Transmission Request registers. After successful transmission, if bit
in the Header Section of the respective Message Buffer is set, the transmit
service request flag in the Status Service Request Register is set (TXI = 1). If enabled
an service request is generated.
20.6.8.5 NULL Frame Transmission
If in static segment the Host does not set the transmission request flag before transmit
time, and if there is no other transmit buffer with matching filter criteria (matching Frame
ID and cycle counter filter), the Communication Controller transmits a NULL Frame with
the NULL Frame indication bit reset to 0 and the payload data reset to zero.
In the following cases the Communication Controller transmits a NULL Frame with the
NULL Frame indication bit reset to 0, and the rest of the Frame Header and the Frame
length unchanged (payload data is reset to zero):
•
All transmit buffers configured for the slot have cycle counter filters that do not match
the current cycle
•
There are matching Frame ID’s and cycle counter filters, but none of these transmit
buffers has the transmission request flag TXR set
NULL Frames are not transmitted in the dynamic segment.
Содержание TC1784
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