CS pin and INT voltage on CAN bus shield

[b.etienne]

Hello,

What is the CS pin on the CAN bus shield. I have seen the schematic pdf and I suppose that’s 10 so this is also the Ethernet CS pin.

What is the voltage of INT pin (2). I suppose that’s 5v but it’s a big problem with Arduino Due supporting only 3.3v.

Looking forward to reading you.

Best regards.

Bernard.

[cory.j.fowler]

@b.etienne

Hello,
What is the CS pin on the CAN bus shield. I have seen the schematic pdf and I suppose that’s 10 so this is also the Ethernet CS pin.
What is the voltage of INT pin (2). I suppose that’s 5v but it’s a big problem with Arduino Due supporting only 3.3v.
Looking forward to reading you.
Best regards.
Bernard.

Hi!
The CS pin is hardwired to pin 10 but there is a solder jumper that allows you to use 9 after cutting the trace for 10. The jumper selection is shown in the schematic.
The CAN-BUS Shield is powered via 5VDC, therefore its I/O is also 5VDC.
I will also add that the shield doesn’t use the ISP header for SPI, which can be an issue as well.
I am working on an updated CAN-BUS Shield that will address these issues.

[ramaekers.pieter]

@cory.j.fowler

@b.etienne

Hello,
What is the CS pin on the CAN bus shield. I have seen the schematic pdf and I suppose that’s 10 so this is also the Ethernet CS pin.
What is the voltage of INT pin (2). I suppose that’s 5v but it’s a big problem with Arduino Due supporting only 3.3v.
Looking forward to reading you.
Best regards.
Bernard.

Hi!
The CS pin is hardwired to pin 10 but there is a solder jumper that allows you to use 9 after cutting the trace for 10. The jumper selection is shown in the schematic.
The CAN-BUS Shield is powered via 5VDC, therefore its I/O is also 5VDC.
I will also add that the shield doesn’t use the ISP header for SPI, which can be an issue as well.
I am working on an updated CAN-BUS Shield that will address these issues.

Hi Cory,

alright! This shield already has the option to go to pin 9 for the SS/CS pin,… but still it is no where explained how the libraries should be addressed so it working with this pin.

A little help would be great I am also interested in seeing your revised layout of the shield. I would be interested myself.

[cory.j.fowler]

Copied from viewtopic.php?p=18740&sid=056c3957b7837e72fe27cfd3c49d8b9e#p18740

Anyone reading this seeking to move the chip_select pin from 10 to 9 on the CAN_shield will need to modify the “#define SPICS” parameter in the “mpc_can_dfs.h” file located in the CAN_Shield/MCP2515_lib library folder.

You will then need to add the following code before SPI.begin and/or CAN.begin and the library will handle the rest:

pinMode(9, OUTPUT); digitalWrite(9, HIGH); // Define IO state to a known level to make sure the MCP2515 is unselected before initiating both SPI and CAN. CAN.begin(SOME_BAUD_RATE); // The rest of the magic stuff