Difference between revisions of "Recans A0"

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(Errata)
(Error messages)
Line 64: Line 64:
 
When sending:  
 
When sending:  
 
- write: No buffer space available
 
- write: No buffer space available
 +
 +
Got error -1 in can write: (105)No buffer space available
  
 
===Debug===
 
===Debug===

Revision as of 21:03, 23 February 2024

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

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:

sudo gpioset 1 165=0
sudo modprobe -r mcp251x
sudo modprobe mcp251x
dmesg | grep mcp
sudo ip link set can0 type can bitrate 1000000
sudo ip link set up can0
sudo ifconfig can0 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

To compile the RP2040 with klipper:

cd ~/klipper
cp test/configs/rp2040.config .config
make menuconfig
-- Communication interface = RP2040
-- RX = GPIO4
-- TX = GPIO5
make
sudo apt install libusb-1.0-0-dev
sudo FLASH_DEVICE="2e8a:0003" make flash


Hardware Errata

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

Error messages

When sending: - write: No buffer space available

Got error -1 in can write: (105)No buffer space available

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.