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RS-485 half-duplex communication

• RS-485 half-duplex communication on RZ/G2L

Kernel Networking Configurations

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devmem2 is used to configure the relevant registers.

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Enable Global test mode (GMDC[1:0]=0x2) in the Global Control Register:

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root@smarc-rzg2l:~# cansend can1 18ff6228##1aa55aa55aa55aa55aa55aa55aa55aa55aa55aa55aa55aa55aa55aa55aa55aa55
  can1  18FF6228  [32]  AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55
  can0  18FF6228  [32]  AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55 AA 55

External loopback test

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Note: obviously this test works only if the CAN transceiver is fitted. Many EVKs shipped recently do not have the transceiver populated. First check that IC15 is soldered on the board.

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