Difference between revisions of "Rock3/dev/can"

Revision as of 07:59, 7 September 2021

    ROCK 3 >  Development >  Using Can

$ ifconfig can0
can0: flags=193<UP,RUNNING,NOARP>  mtu 72
       unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 10  (UNSPEC)
       RX packets 144  bytes 1152 (1.1 KiB)
       RX errors 175  dropped 0  overruns 0  frame 35
       TX packets 0  bytes 0 (0.0 B)
       TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
       device interrupt 62

See more details about device can0

$ ip -details -statistic link show can0
2: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 72 qdisc pfifo_fast state UP mode DEFAULT group defa
ult qlen 10
   link/can  promiscuity 0 minmtu 0 maxmtu 0 
   can <FD> state ERROR-WARNING (berr-counter tx 0 rx 0) restart-ms 0 
         bitrate 1000000 sample-point 0.740 
         tq 20 prop-seg 18 phase-seg1 18 phase-seg2 13 sjw 1
         rockchip_canfd: tseg1 1..128 tseg2 1..128 sjw 1..128 brp 1..256 brp-inc 2
         dbitrate 1000000 dsample-point 0.720 
         dtq 40 dprop-seg 8 dphase-seg1 9 dphase-seg2 7 dsjw 1
         rockchip_canfd: dtseg1 1..32 dtseg2 1..16 dsjw 1..16 dbrp 1..256 dbrp-inc 2
         clock 100000000
         re-started bus-errors arbit-lost error-warn error-pass bus-off
         0          140        0          0          15         0         numtxqueues 1 n
umrxqueues 1 gso_max_size 65536 gso_max_segs 65535 
   RX: bytes  packets  errors  dropped overrun mcast   
   1152       144      175     0       35      0       
   TX: bytes  packets  errors  dropped carrier collsns 
   0          0        0       0       0       0

Test can function by loopback test

Here we need one ROCK 3 A.

$ sudo ip link set can0 down
$ sudo ip link set can0 type can bitrate 1000000 dbitrate 1000000 loopback on fd on
$ sudo ip link set can0 up
$ sudo candump can0 &
$ sudo cansend can0 123#11223344
can0  123   [4]  11 22 33 44

You can run more candump can0 & to get more answer.

Test can function between two ROCK 3 A

Hardware connection

ROCK 3 A One --- SN65HVD23x 3.3-V CAN Bus Transceivers Board One --- SN65HVD23x 3.3-V CAN Bus Transceivers Board Two --- ROCK 3 A Two

Example: ROCK 3 A Two send data to ROCK 3 A One via can

This is the c program : Media:Can_test.zip ROCK 3 A One:

$ gcc -Wall -g -O0 -o can_receive can_receive.c
$ sudo ./can_receive
this is a can receive demo
can_id = 0x123
can_dlc = 8 
data[0] = 1
data[1] = 2
data[2] = 3
data[3] = 4
data[4] = 5
data[5] = 6
data[6] = 7
data[7] = 8

ROCK 3 A Two:

$ gcc -Wall -g -O0 -o can_send can_secd.c
$ sudo ./can_send
this is a can send demo
can_id  = 0x123
can_dlc = 8
data[0] = 1
data[1] = 2
data[2] = 3
data[3] = 4
data[4] = 5
data[5] = 6
data[6] = 7
data[7] = 8

These are the communication between the two boards.

Troubleshooting

Check ROCK 3 FAQs first, if it doesn't help, start a new post on the forum https://forum.radxa.com/c/rock3.

@@ Line 5: / Line 5: @@
      [[rock3 | ROCK 3]] > [[rock3/dev | Development]] > [[rock3/dev/can | Using Can]]
-===Description===
+=== Description ===
+This guide tells about how to use can on ROCK 3 A.
-ROCK 3 supports can function. Here we will test it on ROCK 3A.
+=== Preparation ===
-Here we use two board to test this function.
+* Two ROCK 3 A running Linux OS
-===Hardware support===
+* Two SN65HVD23x 3.3-V CAN Bus Transceivers boards.
+* Several Dupont wires.
-Support hardware platform:
+=== Operations on ROCK 3 A ===
-* ROCK 3A  x2
+==== Install can test tool ====
-* Dupont Line
-=== Operations on ROCK 3A ===
-==== Install Test Tool ====
   $ sudo apt update
   $ sudo apt-get install can-utils iproute2
-==== Check the information of Can ====
+==== Check the information about Can ====
 Check can device
   $ ifconfig can0
@@ Line 31: / Line 29: @@
          device interrupt 62
-Check Can detailed information
+See more details about device can0
   $ ip -details -statistic link show can0
 : can0: <NOARP,UP,LOWER_UP,ECHO> mtu 72 qdisc pfifo_fast state UP mode DEFAULT group defa
@@ Line 53: / Line 51: @@
 ==== Test can function by loopback test ====
-Just need one board.
+Here we need one ROCK 3 A.
   $ sudo ip link set can0 down
   $ sudo ip link set can0 type can bitrate 1000000 dbitrate 1000000 loopback on fd on
@@ Line 60: / Line 59: @@
   $ sudo cansend can0 123#11223344
   can0  123   [4]  11 22 33 44
-you can run more '''candump can0 &''' to get more answer.
-==== Test can function between two Rock 3a ====
+You can run more '''candump can0 &''' to get more answer.
-===== '''how to connect two board:''' =====
-board A:CAN1_TX_M0 connect to board B:CAN1_TX_M0
-board A:CAN1_RX_M0 connect to board B:CAN1_RX_M0
+==== Test can function between two ROCK 3 A ====
-===== '''board A to be receiver and board B to be sender''' =====
+===== Hardware connection =====
+ROCK 3 A One --- SN65HVD23x 3.3-V CAN Bus Transceivers Board One --- SN65HVD23x 3.3-V CAN Bus Transceivers Board Two --- ROCK 3 A Two
+===== Example: ROCK 3 A Two send data to ROCK 3 A One via can =====
 This is the c program : [[Media:Can_test.zip]]
- Board A :
+ROCK 3 A One:
   $ gcc -Wall -g -O0 -o can_receive can_receive.c
   $ sudo ./can_receive
@@ Line 84: / Line 84: @@
   data[7] = 8
- Board B :
+ROCK 3 A Two:
   $ gcc -Wall -g -O0 -o can_send can_secd.c
   $ sudo ./can_send
@@ Line 98: / Line 99: @@
   data[6] = 7
   data[7] = 8
-This is the communication between the two boards.
+These are the communication between the two boards.
+==== Troubleshooting ====
+Check [[rock3/FAQs |ROCK 3 FAQs]] first, if it doesn't help, start a new post on the forum https://forum.radxa.com/c/rock3.

Difference between revisions of "Rock3/dev/can"

Revision as of 07:59, 7 September 2021

Contents

Description

Preparation

Operations on ROCK 3 A

Install can test tool

Check the information about Can

Test can function by loopback test

Test can function between two ROCK 3 A

Hardware connection

Example: ROCK 3 A Two send data to ROCK 3 A One via can

Troubleshooting