ORCA SBC/Interfaces and Connectors/CAN
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| 2021/12/10 | First release | ||
CAN interface[edit | edit source]
Description[edit | edit source]
The CAN interfaces are available on the Evaluation Kit at the connector J8.
J8 is a 20x2x2.54mm pin header expansion connector that delivers many interfaces unused on board and can provide up to two CAN ports.
The CAN bus ports are compatible with the Flexible Data rate (CAN FD) and CAN 2.0B protocols specification.
Signals[edit | edit source]
The following table describes the interface signals:
| Pin# | SOM Pin# | Pin name | Pin function | Pin Notes |
|---|---|---|---|---|
| 10 | J15.140 | SAI2_RXC | CAN1_TX | |
| 12 | J15.146 | SAI2_TXC | CAN1_RX | |
| 16 | J15.148 | SAI2_TXD0 | CAN2_TX | |
| 18 | J15.138 | SAI2_MCLK | CAN2_RX | |
| 22 | J15.166 | SAI5_MCLK | CAN2_RX | |
| 35 | J15.176 | SAI5_RXD3 | CAN2_TX | |
| 36 | J15.174 | SAI5_RXD2 | CAN1_RX | |
| 37 | J15.172 | SAI5_RXD1 | CAN1_TX | |
| 2, 4 | - | 5V_VIN | Power output for transceiver supply | Always ON rail |
| 1, 17 | - | 3V3_CB | Power output for transceiver supply | BOARD_PGOOD driven rail |
| 6, 9, 14, 20, 25, 30, 34, 39 | - | DGND | Ground |
Please note that all the CAN signals are 0-3.3V level. If a 5V powered transceiver is used, a level shifting is needed to interface to the Evaluation Kit connector.
Device mapping[edit | edit source]
CAN devices are mapped to /dev/can<X> device in Linux. The device mapping depends on the device tree configuration.
Device usage[edit | edit source]
The Evaluation Kit doesn't implement any CAN transceiver, these are needed to mediate between the CAN bus and the CPU module.
The peripheral can be configured using ifconfig and ip link utilities and can be tested with the can-utils utilities.
