README.md

@@ -186,11 +186,27 @@ systemctl status example
 ````
 More detailed information about the used q7s commands can be found in the Q7S user manual.
 
-
-
-### Update file in rootfs
+### Bringing up CAN
 ````
-writeprotect 0 0 0 # qspi0 nom unlock (see also Q7S user manual)
+ip link set can0 down
+ip link set can0 type can loopback off
+ip link set can0 up type can bitrate 1000000
+````
+Following command sends 8 bytes to device with id 99 (for petalinux)
+````
+cansend can0 -i99 99 88 77 11 33 11 22 99
+````
+For Q7S use this:
+````
+cansend can0 5A1#11.22.33.44.55.66.77.88
+````
+Turn loopback mode on:
+````
+ip link set can0 type can bitrate 1000000 loopback on 
+````
+Reading data from CAN:
+````
+candump can0
 ````
 
 ### Setting up UNIX environment for real-time functionalities