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VAR-SOM-AM43 Linux Unit Testing

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Unit Testing

1 CPU info

root@varsomam43:~# cat /proc/cpuinfo
processor       : 0
model name      : ARMv7 Processor rev 10 (v7l)
Features        : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls vfpd32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x2
CPU part        : 0xc09
CPU revision    : 10

Hardware        : Generic AM43 (Flattened Device Tree)
Revision        : 0000
Serial          : 0000000000000000
root@varsomam43:~# cat /proc/version
Linux version 3.14.26-gde9decc-dirty (am43@ubuntu) (gcc version 4.7.3 20130226 (prerelease) (crosstool-NG linaro-1.13.1-4.7-2013.03-20130313 - Linaro GCC 2013.03) ) #1 Tue Jan 20 02:46:07 PST 2015


To set the RTC first set the date from Linux shell, type:

$ date 2013.08.27-15:43

Then set the real time clock from Linux shell, type:

$ hwclock --systohc

Power down your board wait 15 seconds and power up. Check your system with date and the time should be up to date.

3 Audio record/play

$ aplay /usr/share/sounds/alsa/Front_Center.wav
$ arecord -f cd -d 10 -D hw:0,0 test.wav
$ aplay test.wav 


The VAR-SOM-AM43 device features a WL183x module, which needs to be configured after installing a new SW image.

Instructions for configuring (only in the first boot):

$ cd /usr/bin/wlconf/
$ ./ [WL18xx chip]
Then choose the correct number of antennas on board and choose (y) to generate a configuration file from wl18xx-conf.bin file.

For example:

root@varsomam43:/usr/bin/wlconf# ./ wl1835
Device is capable of supporting 2 antenna in 2.4Ghz band
how many antennae are fitted? [1/2] : 1
Error: Module wlcore_sdio is not currently loaded
A wl18xx-conf.bin file already exists, do you want to modify it (y) or generate a clean one from .ini (y)
modify it? [y/n] : y

General usage:
List SSIDs, from Linux shell type:

$ ifconfig wlan0 up
$ iw wlan0 scan

Connecting to an encrypted network:

Find your network from the above scan command.

$ wpa_passphrase <YourAP> <YourPassword> >wpa.conf
$ ps | grep wpa_supplicant
*kill the wpa_supplicant process if exist.
$ wpa_supplicant -Dnl80211 -iwlan0 -c./wpa.conf -B
$ udhcpc -iwlan0
$ ifconfig
  • WL18xx calibration tool

Calibration of TI WL12xx wireless device is required and is saved into the NVS file. The NVS file is then used by the wl12xx driver. For more details please read NLCP Calibration Process

5 Gbit Ethernet - ETH0

Please follow the instructions below to activate the ETH1 device and acquire IP for testing. On Target:

$ ifconfig eth1 down
$ ifconfig eth0 up
$ udhcpc -i eth0
$ ifconfig 
$ iperf -s -u

On Host:

$ iperf -c -u -b1000M -w4KB

6 Gbit Ethernet - ETH1

First, make sure your VAR-SOM-AM43 device supports ETH1.

Please follow the instructions below:
1) Build the correct DTB that supports ETH1 port and replace it on the SD-Card:

make -j6 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- var-som-am43-eth1.dtb
sudo cp arch/arm/boot/dts/var-som-am43-eth1.dtb /media/rootfs/boot/var-som-am43.dtb
sudo umount /media/boot/
sudo umount /media/rootfs
sudo umount /media/user

2) Then, activate the ETH1 device and acquire IP for testing. On Target:

$ ifconfig eth0 down
$ ifconfig eth1 up
$ udhcpc -i eth1
$ ifconfig 
$ iperf -s -u

On Host:

$ iperf -c -u -b1000M -w4KB

7 OpenGL demo (supported CPUs)

Run the demo script at Linux command prompt after the VAR-DVK-AM43 EVB boots up


8 ADC controller

please follow TI wiki pages:

9 USB OTG as host

From SW perspective, the developer should do as follows:

  • Download a VAR-SOM-AM43 kernel out-of-tree.
  • Update var-som-am43.dts, as follows:
$ gedit arch/arm/boot/dts/var-som-am43.dts
           usb@47401800 {
                               status = "okay";
                               dr_mode = "host"; /* <<-- Add this line */
  • Build var-som-am43.dtb and replace it on flash / NFS.

Once the var-som-am43.dtb has been replaced on the rootfs - The USB-OTG port will function in Host-only mode.

At this point, the user can simply connect a USB Mouse or DOK to the OTG port.

10 USB OTG as device

Plug a USB cable to a Linux or a Windows host.

Follow and build the backing_file.

On the Target:

$ modprobe g_mass_storage file=./backing_file

On the Host:
Wait for a mass-storage device to be detected.

11 Bluetooth

  • Bring BT device up:
$ hciconfig hci0 up
  • Scan for BT devices and ping:
$ hcitool scan 
$ l2ping 98:03:D8:C7:1A:96

Then work with any other standard bluetooth API and commands.

12 CAN Bus

  • Connect CANL, CANH and GND pins of two VAR-SOM-AM43 boards (located on J17).
  • Power-up both boards.
  • Type the following into the shell of both boards for configuration the CAN bus device:
$ ip link set can0 type can bitrate 50000 triple-sampling on
$ ip link set can0 up
  • Type the following to the shell of board 1 (which is used for testing receiving over can0 device):
$ candump can0
  • Type the following to the shell of board 2 (which is used for testing sending data packets over can0 device):
$ cansend can0 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88
  • At this point, board 1 will receive the data packet sent from board 2:
<0x001> [8] 11 22 33 44 55 66 77 88

13 RS-232 port

  • Start minicom and connect to a UART device:
minicom -D/dev/ttyO2 -b115200 -8

14 RS-485 port

Please do as follows to enable and test RS-485 port:
1. Set the RS-485 port to loopback mode by shorting pins 1 to 3 and 2 to 4 on J11 (on the carrier board).

2. Issue the following commands to the Linux shell to enable:

$ echo 168 > /sys/class/gpio/export
$ echo "out" > /sys/class/gpio/gpio168/direction
$ echo 0 > /sys/class/gpio/gpio168/value

# Tx enable: gpio173
$ echo 173 > /sys/class/gpio/export
$ echo "out" > /sys/class/gpio/gpio173/direction
$ echo 1 > /sys/class/gpio/gpio173/value

$ minicom -D/dev/ttyO2 -b115200 -8

3. Type a few characters at the minicom and see that the loopback is working.