Problem with SPI Communication

[smellit]

Dear all

I'm trying to set up a board using Microchip's MCP2518 controller (MCP2518FD CLICK Board) together with an Arduino Uno, but I can't get SPI communication working.

The example in ACAN2517FD\examples\LoopBackDemoArduinoUno\LoopBackDemoArduinoUno.ino seems to not be able to setup the SPI correctly.

Here a diagram of the SPI CLK (CH1) and SPI MOSI (CH2) using the example:

As check I try the Arduino Barometric Pressure Sensor SPI example and here the SPI seems to be OK:

Any suggestion how to proceed to find the root cause? Thanks in advance!

Ludwig

[pierremolinaro]

Hello, Maybe it's a memory overflow: an Arduino has little memory. Try to reduce the size of the transmit and receive buffers: settings.mDriverTransmitFIFOSize = 0 ; // Should be >= 0 settings.mDriverReceiveFIFOSize = 1 ; //Should be > 0 Otherwise, post your code. Do you try to run one of the sample codes ? Best Regards, Pierre

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Le 4 juil. 2020 à 09:11, Ludo ***@***.*** ***@***.***>> a écrit : Dear all I'm trying to set up a board using Microchip's MCP2518 controller (MCP2518FD CLICK Board <https://www.mikroe.com/mcp2518fd-click>) together with an Arduino Uno, but I can't get SPI communication working. The example in ACAN2517FD\examples\LoopBackDemoArduinoUno\LoopBackDemoArduinoUno.ino seems to not be able to setup the SPI correctly. Here a diagram of the SPI CLK (CH1) and SPI MOSI (CH2) using the example: <https://user-images.githubusercontent.com/8124111/86506954-8462b800-bdd4-11ea-9ad3-b0623d5dbda2.gif> As check I try the Arduino Barometric Pressure Sensor SPI example and here the SPI seems to be OK: <https://user-images.githubusercontent.com/8124111/86506955-84fb4e80-bdd4-11ea-8fd8-f28eeb9ba6e0.gif> Any suggestion how to proceed to find the root cause? Thanks in advance! Ludwig — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#16>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEWKZVAOQDSSSDXU6PFWQOTRZ3IY5ANCNFSM4OQIYNWQ>.

[pierremolinaro]

And you use an MCP2518FD CLICK Board with an Arduino Uno : do you select +5V for VIO ? Pierre

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Le 4 juil. 2020 à 09:11, Ludo ***@***.***> a écrit : Dear all I'm trying to set up a board using Microchip's MCP2518 controller (MCP2518FD CLICK Board <https://www.mikroe.com/mcp2518fd-click>) together with an Arduino Uno, but I can't get SPI communication working. The example in ACAN2517FD\examples\LoopBackDemoArduinoUno\LoopBackDemoArduinoUno.ino seems to not be able to setup the SPI correctly. Here a diagram of the SPI CLK (CH1) and SPI MOSI (CH2) using the example: <https://user-images.githubusercontent.com/8124111/86506954-8462b800-bdd4-11ea-9ad3-b0623d5dbda2.gif> As check I try the Arduino Barometric Pressure Sensor SPI example and here the SPI seems to be OK: <https://user-images.githubusercontent.com/8124111/86506955-84fb4e80-bdd4-11ea-8fd8-f28eeb9ba6e0.gif> Any suggestion how to proceed to find the root cause? Thanks in advance! Ludwig — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#16>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEWKZVAOQDSSSDXU6PFWQOTRZ3IY5ANCNFSM4OQIYNWQ>.

[soso49]

Hello, I've had a hard time setting the SPI com with my arduino UNO and a MCP2518FD click board. I haven't seen a clear wiring scheme yet so I'm sharing mine.

Make sure to remove the jumper on the 3.3V section and solder it on the 5V section.
Note : With this specific wiring, the Slave Select has to be set on pin 10 of your Arduino.

[pierremolinaro]

Thank you very much, I will add this wiring scheme to the library documentation. Best Regards, Pierre

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Le 23 oct. 2020 à 15:12, soso49 ***@***.***> a écrit : Hello, I've had a hard time setting the SPI com with my arduino UNO and a MCP2518FD click board. I haven't seen a clear wiring scheme yet so I'm sharing mine. <https://user-images.githubusercontent.com/73294829/97007471-bfcef100-1541-11eb-95e2-882647477e00.png> Make sure to remove the jumper on the 3.3V section and solder it on the 5V section. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#16 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEWKZVHPGU7VS2T2IL52PS3SMF6MLANCNFSM4OQIYNWQ>.

[dost0011]

Hello, I have the same problem and can't find the solution.
Arduino Mega 2560 Rev. 3 --> MCP2517FD click
I have downloaded your lib and tried the example "LoopBackDemoArduinoUnoNoInt".
I connected the CS to PIN 53 (and changed the code). I have used a Pullup 10kOhm.

Jumpers:
VIO 5V
STBY ON
40 MHz
STBY SEL STBY

51 MOSI --> 6 SDI
50 MISO --> 5 SD0
52 SCK --> 4 SCK
53 CS --> 3 CS
I checked the connections 1000 times.

The error is always 1 = kRequestedConfigurationModeTimeOut.

It looks, that SPI from Arduino Mega doesn't work. I tried settings.mDriverTransmitFIFOSize = 0 --> no effect.

I don't have any single idea... Could you help me?
Many thanks...

[dost0011]

One thing: is it normal that the voltage between CANL and CANH is 0V if nothing is connected?

[dost0011]

Okay. now I'm one step further with a oscilloskop.
CANL and CANH are 2.5V --> that's why the difference is 0v
CLK, MOSI, CS are working. SDO is 0V the whole time.
Does anybody know, how to wake up the SDO from the MCP2517FD?

[pierremolinaro]

Hello, I have checked your connections, I think it is ok. Did you change the the clock setting ? ACAN2517FDSettings::OSC_40MHz for a 40 MHz clock ? Pierre

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Le 22 mars 2022 à 14:00, dost0011 ***@***.***> a écrit : Hello, I have the same problem and can't find the solution. Arduino Mega 2560 Rev. 3 --> MCP2517FD click I have downloaded your lib and tried the example "LoopBackDemoArduinoUnoNoInt". I connected the CS to PIN 53 (and changed the code). I have used a Pullup 10kOhm. Jumpers: VIO 5V STBY ON 40 MHz STBY SEL STBY 51 MOSI --> 6 SDI 50 MISO --> 5 SD0 52 SCK --> 4 SCK 53 CS --> 3 CS I checked the connections 1000 times. The error is always 1 = kRequestedConfigurationModeTimeOut. It looks, that SPI from Arduino Mega doesn't work. I tried settings.mDriverTransmitFIFOSize = 0 --> no effect. I don't have any single idea... Could you help me? Many thanks... — Reply to this email directly, view it on GitHub <#16 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEWKZVDDIFNV3CD7LKHM22TVBG76VANCNFSM4OQIYNWQ>. You are receiving this because you commented.

[pierremolinaro]

I agree, CANH = CANL = 2.5V when the bus is IDLE. Note the easy way for enabling the ATA6563 transceiver is to connect pins 1 and 2 of strap STBY. Pierre

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Le 22 mars 2022 à 16:30, dost0011 ***@***.***> a écrit : Okay. now I'm one step further with a oscilloskop. CANL and CANH are 2.5V --> that's why the difference is 0v CLK, MOSI, CS are working. SDO is 0V the whole time. Does anybody know, how to wake up the SDO from the MCP2517FD? — Reply to this email directly, view it on GitHub <#16 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEWKZVGFXXQIY4NWSVOQ22DVBHRSJANCNFSM4OQIYNWQ>. You are receiving this because you commented.