MCP2515 CAN bus user overlay

[BertHav]

Hereby a tutorial to connect an MCP2515 based CAN bus interface to an OrangePi 3 running successfull with Buster minimal nightly with 5.3 kernel. It uses the attached user overlay only and doesn’t need any other overlay.

 

Connections

CAN module	OPi3 26 pin header	Raspberry CAN interface 40 pin header
Vcc 3.3	CON12-P01	1
Gnd	CON12-P06	6
MOSI	CON12-P19	19
MISO	CON12-P21	21
CLK	CON12-P23	23
CS	CON12-P24	24
INT	CON12-P26	22
Optional 5V for Transceiver on cheap Chinese modules	CON12-P02	Not used when equiped with a 3.3V transceiver

 

Add the attached overlay with the command:

sudo armbian-add-overlay spi-h6-mcp2515.dts

The file /boot/armbianEnv.txt now contains a line:

user_overlays=spi-h6-mcp2515

Reboot the OrangePi 3

Check if the MCP2515 is recognized:

pi@orangepi3:~$ dmesg | grep mcp

If properly connected it should return a line containing:

mcp251x spi1.0 can0: MCP2515 successfully initialized.

As stated a can0 interface should be generated check it with:

pi@orangepi3:~$ sudo ifconfig -a

 

 

Bring up the network:

sudo ip link set can0 up type can bitrate 250000

Check if the interrupt is hooked:

cat /proc/interrupts

should return a line like this

46:          1          0          0          0  sunxi_pio_edge   8 Edge      mcp251x

 

Check for traffic on the CAN bus with candump from can-utils  (sudo apt-get install can-utils)

candump can0

 

spi-h6-mcp2515.dts

[DmitryZ]

sudo armbian-add-overlay spi-h6-mcp2515.dts

Overlays are supported only on mainline kernel based images

Problem on: Orange Pi 3, 5.3.9-sunxi64, Buster

[BertHav]

Searching the forum will give an explanation, sometimes Google is your best friend.....

For short, replace  "sudo armbian-add-overlay spi-h6-mcp2515.dts" with the following commands:

 dtc -@ -q -I dts -O dtb -o spi-h6-mcp2515.dtbo spi-h6-mcp2515.dts

 sudo nano /boot/armbianEnv.txt
          insert the line: user_overlays=spi-h6-mcp2515
          write and exit nano

sudo mkdir -p /boot/overlay-user

sudo cp spi-h6-mcp2515.dtbo /boot/overlay-user/spi-h6-mcp2515.dtbo

Reboot the OrangePi 3 and continue with check if the MCP2515 is recognized

[Zaltora]

Hello, i work on  Lime-a64 board (olimex).

 

Based on this topic and some other around, i wrote the overlay attached.

The module i used is use on this topic for the raspberry : tutorial raspberryi.

 

The pinout:

| Lime-A64  | UEXT Nb |   Function   | Output | Module  |
| --------- | ------- | ------------ | ------ | ------- |
| +3.3      | 1       |              | VCC    | 7       |
| GND       | 2       |              | GND    | 6       |
| PH4       | 3       | UART3TX      |        |         |
| PH5       | 4       | UART3RX      |        |         |
| PH2       | 5       | TWI1-SCK     | INT    | 1       |
| PH3       | 6       | TWI1-SDA     |        |         |
| PC1       | 7       | SPI_MISO     | SO     | 4       |
| PC0       | 8       | SPI_MOSI     | SI     | 3       |
| PC2       | 9       | SPI_CLK      | SCK    | 2       |
| PC3       | 10      | SPI_CS       | CS     | 5       |

 

The mcp seem will initialized and i can up the interfaces. however, i am not sure interrupts works.

This line seem wrong : 

 interrupts = <0 194 2>; /* PH2 IRQ_TYPE_EDGE_FALLING */

 

Someone know how to correctly set the line with the Allwinner A64,  PH2 pin ?

 

 

spi-a64-mcp2515.dts

[Zaltora]

I found correct settings to make my overlay work on the board (Armbian : kernel 5.10)
I use  PB0 as interrupt pin  (change if needed, see comment for interrupt pin)

A64-mcp2515.dts

[Robbudge]

I get a complete system hang on 'sudo ip link set can0 up type can bitrate 250000'
ifconfig -a shows Can0 and no errors that i can see in dmesg

 

I am using the Waveshare CanHat https://www.waveshare.com/rs485-can-hat.htm

 

dtparam=spi=on dtoverlay=mcp2515-can0,oscillator=12000000,interrupt=25,spimaxfrequency=2000000

so i changed the following lines in the dts file.

 

clock-frequency  = <12000000>;

spi-max-frequency = <20000000>;

nothing else, I am Wired as per directions

 

Orange Pi 3.0.6 Bullseye with Linux 5.16.17-sun50iw6

 

Anybody got any idea's ??
I know im close, but with a complete hang, its hard to see the error.

 

 

[Werner]

12 hours ago, Robbudge said:

Orange Pi 3.0.6 Bullseye with Linux 5.16.17-sun50iw6

You are not using Armbian. Therefore this is the wrong place to ask. Try where you go your OS from. We cannot support 3rd party systems.