MCP2515 Library for NRF52

[_Dejan_]

Hi everyone,

Im working and learning for private project CAN bus sniffer which when receive some data trigger some relay...

I have mcp2515_can hw-184 board on which Im replace TJA1050 chip for SN65HVD230. Im add J1 jumper to connect 120ohm resistor. Then Im connect on other side Lawicel CANUSB device together with CANHack software and open 500k CAN connection and periodicly send some data...

Im try few MCP2515 library written in C but looks like none of them do not work or maybe Im do something wrong... I don't have any special tool to analyze frequency on SPI interface...

I use in software:

SPI_SCK_PIN = P0.26

SPI_MISO_PIN  = P0.30

SPI_MOSI_PIN = P0.29

SPI_SS_PIN = P0.31

Connections:

MCP2515 <-> NRF52840 PDK

INT - No connection

SCK <-> P0.26

SI <-> P0.29

SO <-> P0.30

CS <-> P0.31

GND <-> GND

VCC <-> VDD

MCP2515:

NRF52840:

Any hint what to check that I will be sure that SPI interface and connections are ok and I have only software problems? Or is here some working MCP2515 library compatible with NRF5 SDK 17.0.2 ? Or maybe can I somehow change SPI example to test that MCP2515 realy work? I will and I use Softdevice S140(BLE peripheral) if this is important...

Thanks for any help.

[_Dejan_]

Some additional info.

Currently I use library provided by user BendaEng with commented  mcp2515_readRegisterS and log function in main loop.

Library Im get from that thread:

https://devzone.nordicsemi.com/f/nordic-q-a/52046/nrf52832-spi-with-mcp2515-nrf_drv_spi_transfer-seems-to-send-properly-but-not-receiving-in-all-cases

I get log:

<info> app: Start

<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Enter setting mode success

<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: set rate success!!

<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Enter Normal Mode Success!!

<info> app: CAN initialization ok
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.
<info> app: Transfer completed.

So it looks like SPI work. If I call setMode() function and then read mode with getMode() like this:

setMode(MODE_LISTENONLY);

NRF_LOG_INFO("Mode: 0x%02X", getMode());

I get changed mode value. So I think this is ok. Function checkReceive() allways return status 4 if that compare to CAN status then this mean CAN_NOMSG so there is no CAN bus messages(I sending messages from CANUSB device)...

If I uncoment original calls in main loop I get in log values:

<info> app: Transfer completed.
<info> app: Data Received 0 0x0
<info> app: Data Received 1 0x0
<info> app: Data Received 2 0x0
<info> app: Data Received 3 0x0
<info> app: Data Received 4 0x8
<info> app: Transfer completed.

Then I connect to my CANUSB device and open connection and send some data to CAN bus and receive:

<info> app: Transfer completed.
<info> app: Data Received 0 0x0
<info> app: Data Received 1 0x3
<info> app: Data Received 2 0x3
<info> app: Data Received 3 0x0
<info> app: Data Received 4 0x8
<info> app: Transfer completed.

So probably CAN and SPI connection work corectly but need complete "driver" to read/write data on canbus...

After additional researching Im also found that VDD voltage is 2,98V and SN65HVD230 need to work 3,00-3,6V. SN65HVD230 get on pin 2,97V. Then Im select switch to power nrf from USD(Before has been VDD) connect power supply to USB port(nRF USB) to provide power for board. And by registers set voltage to 3.3V(UICR_REGOUT0_VOUT_3V3) ... Reboot board and again check VDD voltage and now is 3.3V and on SN65HVD230 I get 3,29V. But there is no difference...

CANUSB as I know use SJA1000 CAN Bus controller with Philips 82C251 CAN Tranceiver.

Thanks for any help.

[Amanda Hsieh]

Hi, 

The driver is not maintained by Nordic. Maybe you should ask the author of the driver regarding your modification. I would leave the question to the other experts on the forum.

_Dejan_ said:

So probably CAN and SPI connection work corectly but need complete "driver" to read/write data on canbus...

We don't have the complete driver as you require.

-Amanda H.  

[_Dejan_]

Dear Amanda,

Thanks for your reply and help. I know and understand that driver is not developed by Nordic, for this reason Im open ticket in public Q&A if some user have it and can share it... I also see somewhere that is included in Zephyr but then I will need to switch to nRF Connect SDK and probably learn aditional things...