Processor Expert SoftwareのトピックRe: IMX8qm-mek can0 using for J1939

IMX8qm-mek can0 using for J1939

rahulM — Thu, 17 Jun 2021 12:18:41 GMT

Hi NXP,

I am using CAN-0 for J1939 protocol,

I am not able to read CAN data and pgn from the busmaster.

I am using i.MX Linux Yocto Project BSP 5.4.47_2.2.0 Release.

I added can-utils in conf file and enabled CONFIG_CAN_J1939.

I referred https://github.com/linux-can/can-utils/blob/master/testj1939.c still not able to r/w.

Please share any sample J1939 linux based application code to read/write from the busmaster simulator.

Thanks and Regards,

Subbu

Re: IMX8qm-mek can0 using for J1939

igorpadykov — Fri, 18 Jun 2021 00:36:15 GMT

Hi Subbu

If default images for Linux were used, please check if M4 was started. In affirmative case, CAN Resources are assigned to M4 and this can determine Linux CAN driver not to probe.

If this is the case, there are 2 possibilities:

1. M4 is not needed ==> use a flash.bin without M4 firmware (imx-boot-imx8qmmek-sd.bin-flash_linux)

2. Otherwise, M4 Resources has to be unassigned from M4 partition (board.c of SCFW).

Example can be found on below link sect. "Modifying default configuration" :

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/System-Controller-Firmware-101-Resource-management-service/ta-p/1123227

From Linux Kernel perspective, the nodes are enabled in dts:

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm64/boot/dts/freescale/imx8qm-mek.dts?h=imx_5.4.47_2.2.0

>Please share any sample J1939 linux based application code to read/write from the busmaster simulator.

sorry such example is not available.

Best regards
igor

Re: IMX8qm-mek can0 using for J1939

rahulM — Fri, 18 Jun 2021 03:38:41 GMT

Hi Igor,

I will check and update for the same.

Thanks for your support.

Regards,

Subbu