B4R Question CAN-BUS

[mrossen]

Hi,

Is a CAN-BUS library available, ex for the CAN-BUS shield from Sparkfun?

Mogens

 

[Erel]

I've checked this library: https://github.com/Seeed-Studio/CAN_BUS_Shield

If you have the hardware then I can help you integrate it.

 

[mrossen]

Thank you Erel.

I have ordred the Arduino and Can-Bus shield (and a gsm shield) today.

Mogens

 

[mrossen]

Hi Erel,

Now I have got the hardware. The Arduino UNO and the Can-Bus shield from Sparkfun.

Mogens

 

[Erel]

Have you tried this library: https://www.b4x.com/android/forum/threads/rmcp2515.73330/#content ?

 

[mrossen]

Yes,

It seems it only can read from the ODBII standard.

I need to read/write from native Can-Bus.

It have tried to make a library from this https://learn.sparkfun.com/tutorials/can-bus-shield-hookup-guide site, but I don't seem to understand it right.

Mogens

 

[Erel]

I can add the transmitCANMessage / receiveCANMessage methods if they will help you.

 

[mrossen]

It will, Thank you Erel

Mogens

 

[Erel]

Try the attached update. I don't have the hardware to test it.

 

[mrossen]

Now I have tested the Can-Bus Shield.

When I run my code without the shield mounted I get a 0 in return when I init the CanBus.
When I run my code with the shield mounted I get a 1 in return when I init the CanBus.
That seems to be right?

But I can not receive or send any thing. I don't know if it is the library or it is the shield thev is something wrong with?

The timeout in the send function, is it how long time it will sending? Ex. 100ms?

Mogens

 

[Erel]

That seems to be right?

Yes.

is it how long time it will sending? Ex. 100ms?

It will wait up to the timeout value (in milliseconds) until the message is sent.

 

[mrossen]

Hi,

I am still confused about whats not working. I have tonight ordered the CanBus shield from Seeed Studio to see if there is any difference.

You will bu updated

Mogens

 

[mrossen]

Hi,

Now I have the new hardware. A Arduino and CAN-Bus shield from Seeed.

This library: https://github.com/Seeed-Studio/CAN_BUS_Shield works perfect in the Arduino program.

In b4r I revieve a 0 when I try to connect with this code.

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'Public variables can be accessed from all modules.
    Public Serial1 As Serial
    Public CanBus1 As MCP2515

    '    The constants For the baud settings are:
    '    1 = CAN_BAUD_10K
    '    2 = CAN_BAUD_50K
    '    3 = CAN_BAUD_100K
    '    4 = CAN_BAUD_125K
    '    5 = CAN_BAUD_250K
    '    6 = CAN_BAUD_500K
    
    'Is CanBus connected
    Dim canbusConnected As Boolean
    canbusConnected = CanBus1.InitCAN(6)
    Log("CanBus Connected: ", canbusConnected)

Any ideas

Mogens

 

[mrossen]

Hi again,

I have (again) looked in the code.

This part is fron the original code

// demo: CAN-BUS Shield, send data
// loovee@seeed.cc

#include <mcp_can.h>
#include <SPI.h>

// the cs pin of the version after v1.1 is default to D9
// v0.9b and v1.0 is default D10
const int SPI_CS_PIN = 9;

MCP_CAN CAN(SPI_CS_PIN);                                    // Set CS pin

Maybe I need to set the SPI port? But I dont have that option?

Mogens

 

[Erel]

Edit MCP2515.cpp and change SLAVESELECT value (line number 19).

 

[mrossen]

Hmmmm.

Have tried that, with no luck

  13       SCK
   9       CS

*/

#include "SPI.h"
#include "MCP2515.h"

#define SLAVESELECT 9

//MCP2515 Registers
#define RXF0SIDH 0x00