TDA4VH-Q1: Change CAN arbitration bit rate at runtime

Harmish Koshti

Prodigy 20 points

Part Number: TDA4VH-Q1

Tool/software:

Hello TI Expert,

We want to change CAN arbitration bit rate at runtime. Could you please provide the solution for it.

Dts configuration:

&main_mcan12 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&main_mcan12_pins_default>;
phys = <&transceiver1>;
};

main_mcan12_pins_default: mcan12-default-pins {
pinctrl-single,pins = <
J784S4_IOPAD(0x008, PIN_INPUT, 0) /* (AJ33) MCAN12_RX */
J784S4_IOPAD(0x004, PIN_INPUT, 0) /* (AG36) MCAN12_TX */
>;
};

Regards,

Harmish

1 month ago

0 Tarun Mukesh Puvvada 1 month ago

TI__Guru 50736 points

Hello,

In linux , we can change it from terminal .Please look into the below link

https://software-dl.ti.com/processor-sdk-linux/esd/docs/06_03_00_106/linux/Foundational_Components/Kernel/Kernel_Drivers/MCAN.html#:~:text=Quick%20Steps-,Initialize%20CAN%20Bus,-Set%20bitrate

Regards

Tarun Mukesh

0 Harmish Koshti 1 month ago

Prodigy 20 points

Hello,

How can we change from user space application side without using terminal console command.

Regards,

Harmish

0 Tarun Mukesh Puvvada 29 days ago in reply to Harmish Koshti

TI__Guru 50736 points

Hello,

yes you can use socket CAN related API's like below to do.

int can_set_bitrate(const char *name, __u32 bitrate);

Regards

Tarun Mukesh

0 Tarun Mukesh Puvvada 29 days ago in reply to Tarun Mukesh Puvvada

TI__Guru 50736 points

You can also refer the thread to use m_can_platform from userspace.

SK-TDA4VM: How to interface m_can_platform kernel module with userspace application ?

Regards

Tarun Mukesh

0 Harmish Koshti 29 days ago in reply to Tarun Mukesh Puvvada

Prodigy 20 points

Hello Tarun

What header we need to add to execute this API.

Regards,

Harmish

0 Tarun Mukesh Puvvada 29 days ago in reply to Harmish Koshti

TI__Guru 50736 points

Hello,

libsocketcan.h need to be used but TI uses always from terminal so socket CAN usage will be custom specific.

Regards

Tarun Mukesh

0 Harmish Koshti 27 days ago in reply to Tarun Mukesh Puvvada

Prodigy 20 points

Hello Tarun,

Thank you for your Previous information.

I want to know which bitrate support by main_mcan channel as of now we are able to set bit rate but only at 500kb/s and 800kb/s data reflected on canoe tool for rest of them it throws stuff error. Do we have any specific range on which only data is getting transferred and received .

Regards,

Harmish

0 Tarun Mukesh Puvvada 26 days ago in reply to Harmish Koshti

TI__Guru 50736 points

Hello,

We can go upto 5Mbps. Stuff error can be due to another node not responding as expected.

Regards

Tarun Mukesh

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TDA4VH-Q1: Change CAN arbitration bit rate at runtime