Difference between revisions of "Recans A0"

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Recans A0 has two controllers, one is based on RP2040, the other on MCP2515.
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 +
The MCP2515 CAN controller<br>
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<pre>
 
<pre>
−
sudo ip link set can0 type can bitrate 1000000
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sudo mount -o remount,rw /boot
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sudo armbian-add-overlay /boot/overlay-user/sun50i-a64-mcp251x.dts
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sudo mount -o remount,ro /boot
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</pre>
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After booting:
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<pre>
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sudo gpioset 1 165=0
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sudo modprobe -r mcp251x
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sudo modprobe mcp251x
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dmesg | grep mcp
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</pre>
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<pre>
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sudo ip link set can0 type can bitrate 125000
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sudo ip link set can0 txqueuelen 128
 
sudo ip link set up can0
 
sudo ip link set up can0
 
</pre>
 
</pre>
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Interrupt: STEP7 = PL11
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<pre>
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sudo apt install net-tools can-utils
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</pre>
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<pre>
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cansend can1 5A1#11.2233.44556677.88
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</pre>
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<pre>
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ip -details link show can0
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</pre>
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<pre>
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~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0
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</pre>
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<pre>
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candump -tz -Ddex can0,#FFFFFFFF
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</pre>
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To compile the RP2040 with klipper:
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<pre>
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cd ~/klipper
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cp test/configs/rp2040.config .config
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make menuconfig
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-- Communication interface = RP2040
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-- RX = GPIO4
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-- TX = GPIO5
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make
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sudo apt install libusb-1.0-0-dev
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sudo FLASH_DEVICE="2e8a:0003" make flash
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</pre>
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===Hardware Errata===
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* SPI_CLK and SPI_MOSI are interchanged and need to be fixed.
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* /RESET is floating.
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===Error messages===
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When sending:
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- write: No buffer space available
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Got error -1 in can write: (105)No buffer space available
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 +
After that I get:
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DROPCOUNT: dropped 109 CAN frames on 'can0' socket (total drops 576)
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(302.908159)  can0  RX - -  20000004  [8]  00 01 00 00 00 00 00 00  ERRORFRAME                 
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        controller-problem{rx-overflow} 
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 +
And the INT pin remains low. Needs a restart.
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 +
===Debug===
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During init/reset:
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<pre>
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TX: 0xC0 = RESET
 +
 +
TX: 0x03 0x0E 0x00 = READ CANSTAT
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RX: 0x00 0x00 0x80 = Device is in Configuration mode
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TX: 0x03 0x0F 0x00 = READ CANCTRL
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RX: ?
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TX: 0x02 0x0F 0x20 = WRITE CANCTL = Sleep Mode
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</pre>
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 +
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When trying to set interface up:
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<pre>
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TX: 0x02 0x0F 0x80 = WRITE CANCTRL REQOP2 = Configuration Mode
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RX: 0x00 0x00 0x00
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</pre>
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<pre>
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TX: 0x03 0x0E 0x00 = READ CANSTAT
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RX: 0x00 0x00 0x64 = OPMOD[2:0] = 0b011, ICOD[2:0] = 0b010
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</pre>
 +
 +
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.

Latest revision as of 00:28, 25 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 125000
sudo ip link set can0 txqueuelen 128
sudo ip link set up can0

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

candump -tz -Ddex can0,#FFFFFFFF

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

After that I get:

DROPCOUNT: dropped 109 CAN frames on 'can0' socket (total drops 576)

(302.908159) can0 RX - - 20000004 [8] 00 01 00 00 00 00 00 00 ERRORFRAME 

       controller-problem{rx-overflow}

And the INT pin remains low. Needs a restart.

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.

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