Unit Testing¶
CPU info¶
root@varsomam33:~# cat /proc/cpuinfo
processor : 0
model name : ARMv7 Processor rev 2 (v7l)
BogoMIPS : 298.80
Features : half thumb fastmult vfp edsp thumbee neon vfpv3 tls vfpd32
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc08
CPU revision : 2
Hardware : Generic AM33XX (Flattened Device Tree)
Revision : 0000
Serial : 0000000000000000
root@varsomam33:~# cat /proc/version
Linux version 4.1.6 (aviad@baba) (gcc version 4.9.3 20150413 (prerelease) (Linaro GCC 4.9-2015.05) ) #1 PREEMPT
Thu Dec 10 10:26:00 IST 2015
RTC¶
To set the RTC first set the date from Linux shell, type:
Then set the real time clock from Linux shell, type:
Power down your board wait 15 seconds and power up. Check your system with date and the time should be up to date.
Audio record/play¶
$ aplay /usr/share/sounds/alsa/Front_Center.wav
$ amixer sset 'Left Line1L Mux' differential
$ amixer sset 'Right Line1R Mux' differential
$ arecord -f dat -d 10 -D hw:0,0 -N test.wav
$ aplay test.wav
WLAN¶
VAR-SOM-AM33 V2.X only:
When using VAR-SOM-AM33 v2.x, SOM has a WL183x module. In that case you should configure the WL183x module as follows (only in the first boot):
$ cd /usr/bin/wlconf/
$ ./configure-device.sh
Then choose the correct number of module and antennas on board
For example for WL1831:
root@varsomam33:/usr/bin/wlconf# ./configure-device.sh
Please provide the following information.
Are you using a TI module? [y/n] : y
What is the chip flavor? [1801/1805/1807/1831/1835/1837 or 0 for unknown] : 1831
Should SISO40 support be applied? [y/n] : n
The device has been successfully configured.
TI Module: y
Chip Flavor: 1831
Number of 2.4GHz Antennas Fitted: 1
Number of 5GHz Antennas Fitted: 0
Diversity Support: n
SISO40 Support: n
Japanese Standards Applied: n
root@varsomam33:/usr/bin/wlconf# [ 713.882024] wlcore: wl18xx HW: 183x or 180x, PG 2.2 (ROM 0x11)
[ 713.909501] wlcore: loaded
For example for WL1837:
root@varsomam33:/usr/bin/wlconf# ./configure-device.sh
Please provide the following information.
Are you using a TI module? [y/n] : y
What is the chip flavor? [1801/1805/1807/1831/1835/1837 or 0 for unknown] : 1837
Should Japanese standards be applied? [y/n] : n
How many 2.4GHz antennas are fitted? [1/2] : 2
How many 5GHz antennas are fitted? [0/1/2] : 2
The device has been successfully configured.
TI Module: y
Chip Flavor: 1837
Number of 2.4GHz Antennas Fitted: 2
Number of 5GHz Antennas Fitted: 2
Diversity Support: y
SISO40 Support: y
Japanese Standards Applied: n
root@varsomam33:/usr/bin/wlconf# [ 872.471817] wlcore: wl18xx HW: 183x or 180x, PG 2.2 (ROM 0x11)
[ 872.499145] wlcore: loaded
General usage:
List SSIDs, from Linux shell type:
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
- WL12xx 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
First time need to set mac address to be used automatically
100Mbit Ethernet¶
On Target:
On Host:
Gbit Ethernet¶
On Target:
First, enable the eth1 Gbit ethernet interface:
To test the performance of the interface, please type the following on the target:
On Host:
OpenGL demo (supported CPUs)¶
Run the demo script at Linux command prompt after the VAR-DVK-AM33 EVB boots up
ADC controller¶
please follow TI wiki pages: http://processors.wiki.ti.com/index.php/AM335x_ADC_Driver%27s_Guide
USB OTG as host¶
By default the OTG is configure to be "peripheral". You can switch it to "host" if you change the dr_mode in the device tree.
Please see details on the Wiki page below: <var-som-am33_linux_sdk_7_configurations_.md
Once the USB-OTG port has been configured as host, simply connect a USB Mouse or DOK to the OTG port.
USB OTG as device¶
Plug a USB cable to a Linux or a Windows host.
Follow www.linux-usb.org/gadget/file_storage.html and build the backing_file.
On the Target:
On the Host:
Wait for a mass-storage device to be detected.
Bluetooth¶
- Bring BT device up:
- Scan for BT devices and ping:
Then work with any other standard bluetooth API and commands.
CAN Bus¶
- Connect CANL, CANH and GND pins of two VAR-SOM-AM33 boards (located on J17).
- Power-up both boards.
- Type the following into the shell of both boards for configuration the CAN bus device:
- Type the following to the shell of board 1 (which is used for testing receiving over can0 device):
- Type the following to the shell of board 2 (which is used for testing sending data packets over can0 device):
- At this point, board 1 will receive the data packet sent from board 2:
RS-232 port¶
- Enable RS232 UART ttyO1 I/F on the VAR-SOM-AM33:
echo 20 > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio20/direction
echo 0 > /sys/class/gpio/gpio20/value
- Start minicom and connect to a UART device:
SPI interface¶
- The VAR-SOM-AM33 supports SPI interface over am335x SPI-1 bus.
- To enable the SPI bus, the developer should apply the following HW modifications on the VAR-AM33CustomBoard Rev1.2:
1) Remove resistors R9 and R10 (from CustomBoard carrier).
2) Remove U21 component (from CustomBoard carrier).
- Download the kernel out-of-tree, and update the DTS:
and update the following lines(change #if 0 to #if 1) - From:
To
-
Rebuild the var-som-am33.dtb and replace it.
-
Then, to test, build the SPI test application for ARM (and copy it to the target rootfs):
- Start the var-som-am33 board and run the test (SPI-Rx and SPI-Tx lines should be shorted for this test), as follows:
root@varsomam33:~# spidev_test -D /dev/spidev1.0
spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)
FF FF FF FF FF FF
40 00 00 00 00 95
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
DE AD BE EF BA AD
F0 0D
root@varsomam33:~#
Please see a more detailed explanation on the AM335x SPI interface on http://processors.wiki.ti.com/index.php/Linux_Core_SPI_User%27s_Guide
Configuring WIFI as access point (supported on WL18xx only)¶
Configuring hostapd.conf¶
First, we will back up the existing hostapd.conf file by invoking:
Create a new hostapd.conf with the following content:
Copy/paste the following configuration file into /etc/hostapd.conf and save it:
interface=wlan0
driver=nl80211
channel=1
hw_mode=g
preamble=1
dtim_period=2
beacon_int=100
logger_syslog=-1
logger_syslog_level=2
logger_stdout=-1
logger_stdout_level=2
ctrl_interface=/var/run/hostapd
ctrl_interface_group=0
supported_rates=10 20 55 110 60 90 120 180 240 360 480 540
basic_rates=10 20 55 110
ssid=SoftAP_Role
max_num_sta=5
macaddr_acl=0
auth_algs=3
ieee80211d=0
uapsd_advertisement_enabled=1
wep_rekey_period=0
own_ip_addr=127.0.0.1
wpa_group_rekey=0
wpa_strict_rekey=0
wpa_gmk_rekey=0
wpa_ptk_rekey=0
#ap_table_max_size=255
#ap_table_expiration_time=60
eap_server=1
disassoc_low_ack=1
ap_max_inactivity=4294967295
country_code=US
For AP on 5GHz set to these values:
channel=36
hw_mode=a
basic_rates=60 120 240
Explanation:
1) interface - in that case will be wlan0, since wlan0 will take the role of AP
2) channel - should be the same as the commericial AP channel that the station (wlan0)is connected too (since AP and Station need to be in the same channel)
3) hw_mode=g - to support 2.4GHz, a - to support 5GHz
4) ieee80211n=1 - optional to support 802.11n band ssid - the AP SSID
5) basic_rates=10 20 55 110 (11B rates for 2.4GHz) , 60 120 240 (11G rates for 5GHz as not allowed to use 11B in 5GHz)
Configuring udhcpd.conf¶
First, we will back up the existing udhcpd.conf file by invoking:
Create a new udhcpd.conf with the following content: - opt router: is the Router IP address and have to be the same as was defined by ifconfig command, in that example it is 10.4.30.34
Copy/paste the following configuration file into /etc/udhcpd.conf and save it:
# Sample udhcpd configuration file (/etc/udhcpd.conf)
# The start and end of the IP lease block
start 10.4.30.40 #default: 192.168.0.20
end 10.4.30.48 #default: 192.168.0.254
# The interface that udhcpd will use
interface wlan0 #default: eth0
#Examles
opt dns 8.8.8.8 8.8.4.4 # public google dns servers
option subnet 255.255.255.0
opt router 10.4.30.34
option lease 864000 # 10 days of
operate WLAN as AP (Run hostapd)¶
Expected results:
root@varsomam33:~# hostapd -B /etc/hostapd.conf -P /var/run/hostapd.pid
Configuration file: /etc/hostapd.conf
rfkill: Cannot open RFKILL control device
[ 137.215567] wlcore: PHY firmware version: Rev 8.2.0.0.232
[ 137.266947] wlcore: firmware booted (Rev 8.9.0.0.48)
[ 137.293599] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
wlan0: interface state UNINITIALIZED->COUNTRY_UPDATE[ 137.304404] cfg80211: Calling CRDA for country: US
root@varsomam33:~# [ 137.372193] cfg80211: Regulatory domain changed to country: US
[ 137.378114] cfg80211: DFS Master region: FCC
[ 137.383328] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[ 137.393336] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 3000 mBm), (N/A)
[ 137.402341] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 1700 mBm), (N/A)
[ 137.412024] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2300 mBm), (0 s)
[ 137.422169] cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 3000 mBm), (N/A)
[ 137.430304] cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A)
[ 137.461606] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
Assign IP address to the wlan port, note that it has to be the same one as defined in the "udhcpd.conf" file in field "opt router"
Add NAT and DHCP server capability to the AP:
echo 1 > /proc/sys/net/ipv4/ip_forward
udhcpd /etc/udhcpd.conf
iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE
Enable NAT for internet sharing¶
Assumption: Internet connection is available on port eth0 and we want to share it with wlan0 incoming access point connections.
We type the following to enable internet sharing, in this case:
Please see more details on http://processors.wiki.ti.com/index.php/WiLink8_WLAN_Demo:_Linux#AP_.28create_AP_with_no_security.29