LS1028A - CAN "xceiver not present" error

[Sathian]

We are using LS1028A-RDB and LSDK 20.04. On board CAN channel is not receiving any data nor sending the same. We are using Vector CAN4 to send and receive data to EVM.

In Linux: using "ifconfig", CAN channel is visible. We installed CAN application from "can-utils". But no messages were received in "candump" and no messages were sent in "cansend" commands.

In "dmsg", We found "CAN module Xceiver not present" error.

If We probe at Tx and Rx pins of LS1028A, Rx line is receiving some data which is sent from Vector CAN4. But Bus Master is showing "Bus Error" and Error packet is been seen in CAN BUS. Tx remains idle.

[yipingwang]

In LSDK2004 default Linux Kernel configuration file flexcan driver is configured as Kernel module. Please configure Linux Kernel with "CONFIG_CAN_FLEXCAN=y", then rebuild Linux Kernel image. Please refer to the attached Linux Kernel configuration file.

Please refer to the following loopback test on LS1028ARDB.

oot@localhost:~# zcat /proc/config.gz | grep -i flexcan
CONFIG_CAN_FLEXCAN=y
root@localhost:~# echo '7 4 1 7' > /proc/sys/kernel/printk
root@localhost:~# echo $?
0
root@localhost:~# ifconfig can0 down
root@localhost:~# ip link set can0 up type can bitrate 125000 loopback on
root@localhost:~[   50.574113] 001: IPv6: ADDRCONF(NETDEV_CHANGE): can0: link becomes ready
# cat /proc/interrupts |grep can0
 12:          0          0     GICv3  53 Level     can0
root@localhost:~# candump can0 &
[1] 1680
root@localhost:~# echo ' SENSORCAN="can0"
> (1234567890.223344)  can0 123#1122
> (1234567890.223380)  can0 123#2223
> (1234567890.223400)  can0 123#3323
> (1234567890.223420)  can0 123#4423
> (1234567890.223460)  can0 123#5523
> '> can0data.txt 
root@localhost:~#  
root@localhost:~# echo $?
0
root@localhost:~# cat can0data.txt
 SENSORCAN="can0"
(1234567890.223344)  can0 123#1122
(1234567890.223380)  can0 123#2223
(1234567890.223400)  can0 123#3323
(1234567890.223420)  can0 123#4423
(1234567890.223460)  can0 123#5523

root@localhost:~# canplayer -I can0data.txt
  can0  123   [2]  11 22
  can0  123   [2]  11 22
  can0  123   [2]  22 23
  can0  123   [2]  22 23
  can0  123   [2]  33 23
  can0  123   [2]  33 23
  can0  123   [2]  44 23
  can0  123   [2]  44 23
  can0  123   [2]  55 23
  can0  123   [2]  55 23
root@localhost:~# cat /proc/interrupts |grep can0
 12:          6          0     GICv3  53 Level     can0
root@localhost:~# ip -details -statistics link show can0
2: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP mode DEFAULT group default qlen 10
    link/can  promiscuity 0 
    can <LOOPBACK> state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0 
	  bitrate 125000 sample-point 0.875 
	  tq 100 prop-seg 37 phase-seg1 32 phase-seg2 10 sjw 1
	  flexcan: tseg1 2..96 tseg2 2..32 sjw 1..16 brp 1..1024 brp-inc 1
	  flexcan: dtseg1 2..39 dtseg2 2..8 dsjw 1..4 dbrp 1..1024 dbrp-inc 1
	  clock 200000000
	  re-started bus-errors arbit-lost error-warn error-pass bus-off
	  0          0          0          0          0          0         numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535 
    RX: bytes  packets  errors  dropped overrun mcast   
    20         10       0       0       0       0       
    TX: bytes  packets  errors  dropped carrier collsns 
    10         5        0       0       0       0  

[Sathian]

Thanks for reply. @yipingwang 

We are getting "CONFIG_CAN_FLEXCAN=m" (Attached screenshot)

We manually updated below lines in configuration file in location "/packages/linux/linux/arch/arm64/configs/defconfig.txt"

1. CONFIG_CAN=y

2. CONFIG_CAN_FLEXCAN=y

After cleaning, building and packing the linux using below commands

flex-builder –c clean-linux

flex-builder -c linux -a arm64

flex-builder -i mkbootpartition -a arm64

The configuration is set as "m" but We updated to "y". Can you say the procedure to make it "y" ?

[yipingwang]

Please go to folder ~/flexbuild_lsdk2012/build/linux/linux/arm64/LS/output/LSDK-20.12-V5.4 and run the following command, please configure CONFIG_CAN_FLEXCAN=y.

$make ARCH=arm64 menuconfig

Then go to ~/flexbuild_lsdk2012 run the following command.

$ flex-builder -c linux -a arm64