OrangePI CM4 with MCP2515 freeze after 1st frame. Schematic, dtb file

expertup

Hello :-)

I need to add CAN-BUS transmission to the Orange Pi CM4. I found an MCP2515 module and connected it to the Orange Pi. I also found the DTB file configuration to enable the MCP2515 module.

The MCP2515 has an 8MHz crystal.

The transmission seems to be working, but I don't have data transfer between the second device, an RP2040-Zero with an MCP2515.

I have a logic level analyzer, and the transmission seems fine.

The RP2040 sends data to the Orange Pi:

• When I had set a 12MHz crystal for the MCP2515 in the DTB (wrong configuration), the RP2040 sent frames nonstop on the main line. However, when I set it to 8MHz, the RP2040 sent only one frame.
• A single frame is sent, which suggests that the MCP2515 on the Orange Pi is acknowledging the received packet. However, I don’t see any data in candump can0
  

The Orange Pi sends data to the RP2040:

• When I send data to the RP2040 using cansend can0 030#1122334455667788, I can see the received data on the RP2040. However, after sending a second frame with cansend can0 030#1122334455667788, I don’t receive anything. After many attempts, I get an error indicating that the buffer is full.
  
  

This suggests that the Orange Pi isn’t receiving a confirmation of the data from the RP2040.

I have the rk356x-mcp2515-overlay-v2.dts file in /boot/dtb/rockchip/overlay, compiled to a dtbo. In /boot/orangepiEnv.txt, I have added overlays=watchdog mcp2515-overlay-v2.

I got the source for rk356x-mcp2515-overlay-v2.dts from this post: [color=var(--theme-link-color, var(--theme-secondary-400))]https://forum.radxa.com/t/spi-delay-between-radxa-cm3s-and-mcp2515/17008

Where is the problem?

My rk356x-mcp2515-overlay-v2.dts source:

1. /dts-v1/;
   
2. 
   
3. /{
   
4. 
   
5.         metadata {
   
6.                 title = "Enable MCP2515 SPI3M0 to CAN";
   
7.                 compatible = "rockchip,rk3566\0rockchip,rk3568";
   
8.                 category = "misc";
   
9.                 description = "Enable MCP2515 SPI3M0 to CAN With 8M Crystal Oscillator.";
   
10.         };
    
11. 
    
12.         fragment@0 {
    
13.                 target = <0xffffffff>;
    
14. 
    
15.                 __overlay__ {
    
16. 
    
17.                         mcp2515_int_pin {
    
18. 
    
19.                                 mcp2515_int_pin {
    
20.                                         rockchip,pins = <0x03 0x1d 0x00 0xffffffff>;
    
21.                                         phandle = <0x02>;
    
22.                                 };
    
23.                         };
    
24.                 };
    
25.         };
    
26. 
    
27.         fragment@1 {
    
28.                 target-path = [2f 00];
    
29. 
    
30.                 __overlay__ {
    
31. 
    
32.                         can-mcp2515-osc {
    
33.                                 compatible = "fixed-clock";
    
34.                                 clock-frequency = <0x7A1200>;
    
35.                                 #clock-cells = <0x00>;
    
36.                                 phandle = <0x01>;
    
37.                         };
    
38.                 };
    
39.         };
    
40. 
    
41.         fragment@2 {
    
42.                 target = <0xffffffff>;
    
43. 
    
44.                 __overlay__ {
    
45.                         status = "okay";
    
46.                         max-freq = <0x7735940>;
    
47.                         #address-cells = <0x01>;
    
48.                         #size-cells = <0x00>;
    
49.                         pinctrl-0 = <0xffffffff 0xffffffff>;
    
50.                         pinctrl-1 = <0xffffffff 0xffffffff>;
    
51. 
    
52.                         can-mcp2515@0 {
    
53.                                 status = "okay";
    
54.                                 compatible = "microchip,mcp2515";
    
55.                                 reg = <0x00>;
    
56.                                 interrupt-parent = <0xffffffff>;
    
57.                                 interrupts = <0 132 2>;//<0x10 0x08>;
    
58.                                 spi-max-frequency = <0x989680>;
    
59.                                 clocks = <0x01>;
    
60.                                 vdd-supply = <0xffffffff>;
    
61.                                 xceiver-supply = <0xffffffff>;
    
62.                                 pinctrl-names = "default";
    
63.                                 pinctrl-0 = <0x02>;
    
64.                                 phandle = <0x03>;
    
65.                         };
    
66.                 };
    
67.         };
    
68. 
    
69.         __symbols__ {
    
70.                 mcp2515_int_pin = "/fragment@0/__overlay__/mcp2515_int_pin/mcp2515_int_pin";
    
71.                 can_mcp2515_osc = "/fragment@1/__overlay__/can-mcp2515-osc";
    
72.                 can_mcp2515 = "/fragment@2/__overlay__/can-mcp2515@0";
    
73.         };
    
74. 
    
75.         __fixups__ {
    
76.                 pinctrl = "/fragment@0:target:0";
    
77.                 pcfg_pull_none = "/fragment@0/__overlay__/mcp2515_int_pin/mcp2515_int_pin:rockchip,pins:12";
    
78.                 spi3 = "/fragment@2:target:0";
    
79.                 spi3m0_cs0 = "/fragment@2/__overlay__:pinctrl-0:0\0/fragment@2/__overlay__:pinctrl-1:0";
    
80.                 spi3m0_pins = "/fragment@2/__overlay__:pinctrl-0:4";
    
81.                 spi3m0_pins_hs = "/fragment@2/__overlay__:pinctrl-1:4";
    
82.                 gpio4 = "/fragment@2/__overlay__/can-mcp2515@0:interrupt-parent:0";
    
83.                 vcc3v3_sys = "/fragment@2/__overlay__/can-mcp2515@0:vdd-supply:0\0/fragment@2/__overlay__/can-mcp2515@0:xceiver-supply:0";
    
84.         };
    
85. 
    
86.         __local_fixups__ {
    
87. 
    
88.                 fragment@2 {
    
89. 
    
90.                         __overlay__ {
    
91. 
    
92.                                 can-mcp2515@0 {
    
93.                                         clocks = <0x00>;
    
94.                                         pinctrl-0 = <0x00>;
    
95.                                 };
    
96.                         };
    
97.                 };
    
98.         };
    
99. };

Copy code

Wiring:

OrangePi CM4 Pin	MCP2515 Pin	TJA1050 Pin
1 (3.3V)	VCC	-
2, 4 (5V)	-	VCC
9 (GND)	GND	GND
19 (GPIO138 - SPI3_MOSI_M0)	SI	-
21 (GPIO136 - SPI3_MISO_M0)	SO	-
22 (GPIO132 - GPIO4_A4)	INT	-
23 (GPIO139 - SPI3_CLK_M0)	SCK	-
24 (GPIO134 - SPI3_CS0_M0)	CS	-

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