Recans A0

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.