Difference between revisions of "Recans A0"

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(Debug)
(Debug)
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Device is in Listen-Only mode, Wake-up interrupt
 
Device is in Listen-Only mode, Wake-up interrupt
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It seems that the bring up sequence interferes with the initialization. Must make sure the mcp2515 probing is done after power is applied.

Revision as of 23:31, 22 February 2024

Recans A0 has two controllers, one is based on RP2040, the other on MCP2515.

To bring up the RP2040 CAN controller:

sudo ip link set can0 type can bitrate 1000000
sudo ip link set up can0
sudo ifconfig can0 txqueuelen 128


The MCP2515 CAN controller

sudo mount -o remount,rw /boot
sudo armbian-add-overlay /boot/overlay-user/sun50i-a64-mcp251x.dts
sudo mount -o remount,ro /boot

After booting:

dmesg | grep mcp
sudo ip link set can1 type can bitrate 1000000
sudo ip link set up can1
sudo ifconfig can1 txqueuelen 128

Interrupt: STEP7 = PL11

sudo apt install net-tools can-utils
cansend can1 5A1#11.2233.44556677.88
ip -details link show can0
~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0

Errata

  • SPI_CLK and SPI_MOSI are interchanged and need to be fixed.
  • /RESET is floating.


Debug

During init/reset:

TX: 0xC0 = RESET

TX: 0x03 0x0E 0x00 = READ CANSTAT
RX: 0x00 0x00 0x80 = Device is in Configuration mode

TX: 0x03 0x0F 0x00 = READ CANCTRL
RX: ? 

TX: 0x02 0x0F 0x20 = WRITE CANCTL = Sleep Mode


When trying to set interface up:

TX: 0x02 0x0F 0x80 = WRITE CANCTRL REQOP2 = Configuration Mode
RX: 0x00 0x00 0x00 
TX: 0x03 0x0E 0x00 = READ CANSTAT
RX: 0x00 0x00 0x64 = OPMOD[2:0] = 0b011, ICOD[2:0] = 0b010

Device is in Listen-Only mode, Wake-up interrupt


It seems that the bring up sequence interferes with the initialization. Must make sure the mcp2515 probing is done after power is applied.