[参考译文] AM625：am62x canbus

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https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1453027/am625-am62x-canbus

器件型号：AM625

工具与软件：

您好！

我正在尝试使用 AM6254处理器在定制硬件上测试 CAN 总线端口。我正在使用 https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/10_00_07_04/exports/docs/linux/Foundational_Components 内核/Kernel/MCAN/MCAN.html#mcan 页面中的控制台命令 Kernel_Drivers

我能够测试 main_mcan0、但 mcu_mcan0和 mcu_mcan1会停止 CPU。我的第一个问题是、我们是否能够使用 MCU 域中的 CAN 总线。因为上面的页面对 MCU_CAN0使用 candump。如果允许我们使用、那么 CPU 卡住的原因可能是什么

您可以在下面找到 mcu_mcan0和 main_mcan0的结果：

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root@am62xx-evm:~# ip link set mcu_mcan0 type can bitrate 500000 dbitrate 1000000 fd on
root@am62xx-evm:~# ip link set mcu_mcan0 up
root@am62xx-evm:~# candump mcu_mcan0
[  253.256652] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[  253.262766] rcu: 2-...0: (6 ticks this GP) idle=3c0c/1/0x4000000000000002 softirq=6991/6992 fqs=2625
[  253.271981] rcu: (detected by 3, t=5255 jiffies, g=6301, q=812 ncpus=4)
[  253.278669] Task dump for CPU 2:
[  253.281888] task:swapper/2       state:R  running task     stack:0     pid:0     ppid:1      flags:0x0000000a
[  253.291792] Call trace:
[  253.294229]  __switch_to+0xcc/0x12c
[  253.297725]  0x0
[  270.620622] omap_i2c 20020000.i2c: controller timed out
[  270.625903] ili210x_i2c 2-0041: ili251x_read_reg_common failed: -110
[  270.632265] ili210x_i2c 2-0041: Unable to get touch data: -110
[  271.676619] omap_i2c 20020000.i2c: controller timed out
[  271.681889] ili210x_i2c 2-0041: ili251x_read_reg_common failed: -110
[  271.688260] ili210x_i2c 2-0041: Unable to get touch data: -110
[  272.732599] omap_i2c 20020000.i2c: controller timed out
[  272.737846] ili210x_i2c 2-0041: ili251x_read_reg_common failed: -110
[  272.744197] ili210x_i2c 2-0041: Unable to get touch data: -110
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

root@am62xx-evm:~# ip link set mcu_mcan0 type can bitrate 500000 dbitrate 1000000 fd on
root@am62xx-evm:~# ip link set mcu_mcan0 up
root@am62xx-evm:~# candump mcu_mcan0
[  253.256652] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[  253.262766] rcu: 2-...0: (6 ticks this GP) idle=3c0c/1/0x4000000000000002 softirq=6991/6992 fqs=2625
[  253.271981] rcu: (detected by 3, t=5255 jiffies, g=6301, q=812 ncpus=4)
[  253.278669] Task dump for CPU 2:
[  253.281888] task:swapper/2       state:R  running task     stack:0     pid:0     ppid:1      flags:0x0000000a
[  253.291792] Call trace:
[  253.294229]  __switch_to+0xcc/0x12c
[  253.297725]  0x0
[  270.620622] omap_i2c 20020000.i2c: controller timed out
[  270.625903] ili210x_i2c 2-0041: ili251x_read_reg_common failed: -110
[  270.632265] ili210x_i2c 2-0041: Unable to get touch data: -110
[  271.676619] omap_i2c 20020000.i2c: controller timed out
[  271.681889] ili210x_i2c 2-0041: ili251x_read_reg_common failed: -110
[  271.688260] ili210x_i2c 2-0041: Unable to get touch data: -110
[  272.732599] omap_i2c 20020000.i2c: controller timed out
[  272.737846] ili210x_i2c 2-0041: ili251x_read_reg_common failed: -110
[  272.744197] ili210x_i2c 2-0041: Unable to get touch data: -110

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root@am62xx-evm:~# ip link set main_mcan0 type can bitrate 500000 dbitrate 1000000 fd on
root@am62xx-evm:~# ip link set main_mcan0 up
root@am62xx-evm:~# candump main_mcan0
[  172.201623] can: controller area network core
[  172.206120] NET: Registered PF_CAN protocol family
[  172.221811] can: raw protocol
  main_mcan0  12345678  [01]  DD
  main_mcan0  12345678  [01]  DD
  main_mcan0  12345678  [01]  DD
  main_mcan0  12345678  [01]  DD
  main_mcan0  12345678  [01]  DD
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

root@am62xx-evm:~# ip link set main_mcan0 type can bitrate 500000 dbitrate 1000000 fd on
root@am62xx-evm:~# ip link set main_mcan0 up
root@am62xx-evm:~# candump main_mcan0
[  172.201623] can: controller area network core
[  172.206120] NET: Registered PF_CAN protocol family
[  172.221811] can: raw protocol
  main_mcan0  12345678  [01]  DD
  main_mcan0  12345678  [01]  DD
  main_mcan0  12345678  [01]  DD
  main_mcan0  12345678  [01]  DD
  main_mcan0  12345678  [01]  DD

THX。

4 个月前