Issues with trace recording

[alessandrop]

Hello Marvin,

Actually, since there were so many problems with the provided firmware, I decided to implement my own custom firmware. Starting from example 21_RTOS_FILESYSTEM and others, I'm now able to:

• record traces on file of customisable size

• use a timeout based on CAN traffic and Wake-Up signal detection for saving the file

• check if the disk is full, then delete the oldest file and a create a new one

The only thing that I was not able to implement so far is the customisation of the baud rate for the different CAN channels without flashing every time a new firmware version.

I basically would like to replicate the feature of the provided firmware, so that I can assign the baud rate for every channel via file.

Since I know that modifying the following variable in can_user.c

Code: Select all

static const CANTiming_t  Timing_CANx[6] = {
_40M_250K_80____2M_80_ISO,	  // CAN1
_40M_250K_80____2M_80_ISO,	  // CAN2
_40M_500K_80____4M_80_ISO,	  // CAN3
_40M_250K_80____2M_80_ISO,	  // CAN4
_40M_250K_80____2M_80_ISO,	  // CAN5
_40M_250K_80____2M_80_ISO	  // CAN6
};

it is possible to change the speed for every channel, I looked for every instances of it and I tried to modify CAN_UserRead, CANQUEUE_TimerCB, CANQUEUE_Startup, and CAN_UserInit functions in order to let them accept a CANTiming_t variable as input from the main function.

Unfortunately, I failed in this. Even if the code compilation goes well, with my implementation no more traces are recorded. Could you please provide me a help? Maybe a sample code of this part already implemented?

Thank you,
Alessandro

[M.Heidemann]

Hello Allesandro,

These bitrate-constants are defined in can_user.h ("Inc" folder), if you want to use a different bitrate-config or define your own,
please modify/check this file.

BR

Marvin

[alessandrop]

As above described, I already found that modifying that file it is possible to use different bitrate. But, I would like to do it programmatically, at runtime.

And given that in the provided firmware this feature is already implemented, I was wondering if you can provide an already working sample code for that part.

[M.Heidemann]

Hi,

have a look at the corresponding can_user.c,
this is the init-sequence for the channels.

Use CAN_UnInitialize to bring a channel down again and bring it back up using

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CAN_Initialize ( hBus, &Timing_CANx[hBus]);

Make sure to use your intended bitrate for reinitialization.

This should enable your to change birate during runtime.

BR

Marvin

[alessandrop]

Thank you for the support, using both CAN_UnInitialize and CAN_Initialize worked.