pierremolinaro
Problem with SPI Communication
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
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
Le 4 juil. 2020 à 09:11, Ludo <[email protected] mailto:[email protected]> 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
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And you use an MCP2518FD CLICK Board with an Arduino Uno : do you select +5V for VIO ?
Pierre
Le 4 juil. 2020 à 09:11, Ludo [email protected] 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
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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.
Thank you very much, I will add this wiring scheme to the library documentation.
Best Regards,
Pierre
Le 23 oct. 2020 à 15:12, soso49 [email protected] 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.
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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...
One thing: is it normal that the voltage between CANL and CANH is 0V if nothing is connected?
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?
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
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...
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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
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?
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