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During the data phase of a FDCAN transmission only one node is transmitting, all others are receivers. The length of the bus line has no impact. When transmitting via pin FDCAN_TX the protocol controller receives the transmitted data from its local CAN transceiver via pin FDCAN_RX. The received data is delayed by the CAN transceiver loop delay. If this delay is greater than TSEG1 (time segment before sample point), a bit error is detected. Without transceiver delay compensation, the bit rate in the data phase of a FDCAN frame is limited by the transceiver's loop delay. Since this parameter is related to the transceiver used, there cannot be a default value, and it must be explicitly defined with the configuration variable CONFIG_FDCAN_DEVICE_TRANSCEIVER_LOOP_DELAY. Signed-off-by: Gilles DOFFE <gilles.doffe@rtone.fr>
37 lines
1.2 KiB
Plaintext
37 lines
1.2 KiB
Plaintext
menu "CAN"
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depends on USEMODULE_CAN || USEMODULE_FDCAN
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menu "FD CAN"
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config FDCAN_DEVICE_SET_TRANSCEIVER_LOOP_DELAY
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depends on USEMODULE_FDCAN
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bool "FD CAN transceiver loop delay"
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default n
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help
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Allow to set FD CAN Transceiver loop delay.
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config FDCAN_DEVICE_TRANSCEIVER_LOOP_DELAY
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depends on FDCAN_DEVICE_SET_TRANSCEIVER_LOOP_DELAY
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int "FD CAN transceiver loop delay value"
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range 0 1000
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default 0
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help
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This parameter defines the loop delay introduced by the CAN transceiver
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during transmission. The loop delay represents the time taken for the
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transmitted signal to be looped back to the CAN controller. This delay
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is introduced by the physical transceiver circuitry and may vary
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depending on the transceiver model and other physical factors.
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The value is typically measured in nanoseconds and should be set
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according to the specifications provided by the transceiver manufacturer.
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A higher loop delay can affect the timing of CAN message transmissions
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and may need to be adjusted in systems with tight timing requirements.
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If unsure, leave this value as 0 or refer to the hardware documentation
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for the correct delay value.
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endmenu # FD CAN
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endmenu # CAN
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