i.MX Processors中的主题 Re: Can bus cann't work normally on sabresd platform

Can bus cann't work normally on sabresd platform

tangyuan — Mon, 24 Oct 2016 07:22:17 GMT

I am debugging can bus on sabresd platform.But CAN bus cann't work normally on sabresd platform.

I cann't probe the waveform from the CAN0_TX.

Firstly i add the pin in board_mx6q_sabresd.h:

MX6Q_PAD_GPIO_7__CAN1_TXCAN,
MX6Q_PAD_GPIO_8__CAN1_RXCAN,

Secondly ,I follow the steps below

dmesg | grep can

ip link set can0 up type can bitrate 125000

ifconfig can0 up

ifconfig can0

cansend can0 -i0x100 11 22 33 44

But i cann't still probe the waveform from the CAN0_TX

The picture is as follows

one

My kernel is linux 3.0.35. Attachment is my reference document

Can you anyone help me ?

Re: Can bus cann't work normally on sabresd platform

igorpadykov — Mon, 24 Oct 2016 11:02:04 GMT

Hi tang

for testing two boards should be used. Alternatively one can test

with imx-test package (..test/can folder)

www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-test-5.4.tar.gz

Best regards
igor
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Re: Can bus cann't work normally on sabresd platform

tangyuan — Mon, 31 Oct 2016 02:41:38 GMT

HI:

My main problem is that i cann't probe any wareform from the CAN1_TX

Re: Can bus cann't work normally on sabresd platform

igorpadykov — Mon, 31 Oct 2016 06:36:55 GMT

had you tried loopback test

Re: Can bus cann't work normally on sabresd platform

tangyuan — Mon, 31 Oct 2016 08:02:10 GMT

HI:

igorpadykov:

The loopback test is that CAN1_TX connected CAN1_RX?

Re: Can bus cann't work normally on sabresd platform

igorpadykov — Mon, 31 Oct 2016 08:19:51 GMT

yes

Re: Can bus cann't work normally on sabresd platform

tangyuan — Mon, 31 Oct 2016 09:07:03 GMT

HI:

igorpadykov:

Do I need to connect CAN1_TX and CAN1_RX?

Now ,i didn't connect CAN1_TX and CAN1_RX.But i get the data.

My test command is as follws:

root@freescale /$ ip link set can0 down
root@freescale /$ ip link set can0 type can bitrate 50000 loopback on
root@freescale /$ ip link set can0 up
flexcan imx6q-flexcan.0: writing ctrl=0x27293005
root@freescale /$ candump can0 &
[1] 2570
interface = can0, family = 29, type = 3, proto = 1

root@freescale /$ cansend can0 -i 0x01 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88
interface = can0, family = 29, type = 3, proto = 1
<0x001> [8] 11 22 33 44 55 66 77 88
root@freescale /$

root@freescale /$ cantest can0 1F334455#1122334455667788
root@freescale /$ <0x1f334455> [8] 11 22 33 44 55 66 77 88

This is correct?

Re: Can bus cann't work normally on sabresd platform

igorpadykov — Mon, 31 Oct 2016 09:26:04 GMT

> Now ,i didn't connect CAN1_TX and CAN1_RX.But i get the data.

CAN1_RX should be connected to CAN1_TX in loopback mode

or other board, otherwise CAN1_RX may be treated by driver as always busy

state and will not send data.

Re: Can bus cann't work normally on sabresd platform

tangyuan — Tue, 01 Nov 2016 01:57:55 GMT

HI:

igorpadykov

I have already connected CAN1_TX and CAN1_RX.

I test as follows:

Is this correct?

I havn't still probed any waveform on CAN1_TX or CAN1_RX