iMX8M Industrial Accessing and Testing Peripherals
Elemental operations of iMX8M Industrial Development Kit interfaces in Max configuration are shown on this page.
Prerequisites
Hardware
- DC power supply (5V, 8A, 40W)
- iMX8M Industrial Development Kit Max
Peripherals and Accessories
- 1x FullHD monitor with Audio output
- 1x MicroSD card
- KOE LVDS capacitive display set
- Newhaven LVDS capacitive display set
- Digilent MIPI-CSI camera
- NXP MIPI-CSI camera
- CANBus module
- Wifi and Bluetooth antenna set
Cables
- Ethernet cable
- HDMI cable
- Micro USB cable
- USB to UART cable
- Headphones
Audio
Input: Search kernel log for wm8904 chip
Output: Audio chip is detected and bound as an input device
[ 1.864809] fsl-asoc-card sound-wm8904: failed to find codec device [ 2.155773] wm8904 0-001a: 0-001a supply DCVDD not found, using dummy regulator [ 2.163163] wm8904 0-001a: 0-001a supply DBVDD not found, using dummy regulator [ 2.170561] wm8904 0-001a: 0-001a supply AVDD not found, using dummy regulator [ 2.177846] wm8904 0-001a: 0-001a supply CPVDD not found, using dummy regulator [ 2.185209] wm8904 0-001a: 0-001a supply MICVDD not found, using dummy regulator [ 2.197860] wm8904 0-001a: revision A [ 2.699093] debugfs: Directory '308b0000.sai' with parent 'wm8904-audio' already present! [ 2.707395] fsl-asoc-card sound-wm8904: wm8904-hifi <-> 308b0000.sai mapping ok [ 2.714808] fsl-asoc-card sound-wm8904: ASoC: no DMI vendor name! [ 3.145901] #1: wm8904-audio
Input: Run amixer command
Output: Controls for card are available
root@imx8mq-voipac:~# amixer -c1 Simple mixer control 'Headphone',0 Capabilities: volume pswitch Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 63 Front Left: 46 [73%] [-11.00dB] Playback [on] Front Right: 45 [71%] [-12.00dB] Playback [on] Simple mixer control 'Headphone ZC',0 Capabilities: pswitch Playback channels: Front Left - Front Right Mono: Front Left: Playback [on] Front Right: Playback [on] Simple mixer control 'Line Output',0 Capabilities: volume pswitch Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 63 Front Left: 57 [90%] [0.00dB] Playback [on] Front Right: 57 [90%] [0.00dB] Playback [on] Simple mixer control 'Line Output ZC',0 Capabilities: pswitch Playback channels: Front Left - Front Right Mono: Front Left: Playback [on] Front Right: Playback [on] ...
Input: Boot-up the board with HDMI cable plugged in, connect headphones into HP_OUT connector and plug-in USB flash drive with wav file on it
Output: Sound is played and heard
root@imx8mq-voipac:~# aplay multimedia/sample.wav Playing WAVE 'multimedia/sample.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
root@imx8mq-voipac:~# #aplay -D sysdefault:CARD=wm8904audio multimedia/sample.wav root@imx8mq-voipac:~# aplay -D sysdefault:CARD=wm8904audio multimedia/sample.wav Playing WAVE 'multimedia/sample.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
root@imx8mq-voipac:~# aplay -D sysdefault:CARD=imxaudiohdmi multimedia/sample.wav Playing WAVE 'multimedia/sample.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Input: Plug headphones with microphone input into HP_OUT connector and microphone to MIC
Output: Microphone sound is played in headphones
root@imx8mq-voipac:~# #arecord -D sysdefault:CARD=wm8904audio -t wav -f cd | aplay -D sysdefault:CARD=wm8904audio root@imx8mq-voipac:~# arecord -D sysdefault:CARD=wm8904audio -t wav -f cd | aplay -D sysdefault:CARD=wm8904audio
Input: Verify Digital microphone
Output: Microphone sound is played in headphones
root@imx8mq-voipac:~# amixer -c1 sset "Capture Input" "DMIC" root@imx8mq-voipac:~# #arecord -D sysdefault:CARD=wm8904audio -t wav -f cd | aplay -D sysdefault:CARD=wm8904audio root@imx8mq-voipac:~# arecord -D sysdefault:CARD=wm8904audio -t wav -f cd | aplay -D sysdefault:CARD=wm8904audio
User buttons
Input: Press Enter/Left/Right/Up/Down buttons
Output: Button events 1 and 0 are generated
root@imx8mq-voipac:~# evtest /dev/input/by-path/platform-gpio-buttons-event
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100
Input device name: "gpio-buttons"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 28 (KEY_ENTER)
Event code 103 (KEY_UP)
Event code 105 (KEY_LEFT)
Event code 106 (KEY_RIGHT)
Event code 108 (KEY_DOWN)
Properties:
Testing ... (interrupt to exit)
Reset button
Input: Press the RESET button
Output: The board will execute bootloader immediately with "Reset cause: POR"
Note: iMX8M Industrial Development Kit should never freeze or hang after the reset button was pressed. Testing the operation 10 times gives a reliable result
U-Boot 2020.04-imx_v2020.04_5.4.24_2.1.0+g4979a99482 (May 30 2020 - 06:50:01 +0000) CPU: i.MX8MQLite rev2.1 1300 MHz (running at 800 MHz) CPU: Industrial temperature grade (-40C to 105C) at 62C Reset cause: POR Model: Voipac i.MX8MQ EVK DRAM: 2 GiB MMC: FSL_SDHC: 0, FSL_SDHC: 1 Loading Environment from MMC... OK [*]-Video Link 0imx8m_hdmi_probe ....
Power button
Input: Press the POWER button
Output: The board will shutdown. By pressing again board should start booting."
[ OK ] Stopped target Sound Card.
[ OK ] Stopped target System Time Synchronized.
[ OK ] Stopped target System Time Set.
[ OK ] Stopped target Timers.
[ OK ] Stopped Daily Cleanup of Temporary Directories.
Stopping Save/Restore Sound Card State...
Stopping Kernel Logging Service...
Stopping System Logging Service...
Stopping Getty on tty1...
Stopping Serial Getty on ttymxc0...
Stopping Hostname Service...
Stopping Load/Save Random Seed...
[ OK ] Stopped Kernel Logging Service.
[ OK ] Stopped System Logging Service.
[ OK ] Stopped Getty on tty1.
[ OK ] Stopped Serial Getty on ttymxc0.
[ OK ] Stopped Hostname Service.
[ OK ] Stopped Save/Restore Sound Card State.
[ OK ] Stopped Load/Save Random Seed.
[ OK ] Stopped Session c1 of user root.
[ OK ] Removed slice system-getty.slice.
[ OK ] Removed slice system-serial\x2dgetty.slice.
Stopping Login Service...
Stopping User Manager for UID 0...
[ OK ] Stopped User Manager for UID 0.
Stopping User Runtime Directory /run/user/0...
[ OK ] Unmounted /run/user/0.
[ OK ] Stopped User Runtime Directory /run/user/0.
[ OK ] Removed slice User Slice of UID 0.
Stopping D-Bus System Message Bus...
Stopping Permit User Sessions...
[ OK ] Stopped D-Bus System Message Bus.
[ OK ] Stopped Login Service.
[ OK ] Stopped Permit User Sessions.
[ OK ] Stopped target Basic System.
[ OK ] Stopped target Network.
[ OK ] Stopped target Paths.
[ OK ] Stopped Dispatch Password ��…ts to Console Directory Watch.
[ OK ] Stopped Forward Password R��…uests to Wall Directory Watch.
[ OK ] Stopped target Remote File Systems.
[ OK ] Stopped target Slices.
[ OK ] Removed slice User and Session Slice.
[ OK ] Stopped target Sockets.
[ OK ] Closed D-Bus System Message Bus Socket.
[ OK ] Closed dropbear.socket.
[ OK ] Stopped target System Initialization.
[ OK ] Closed Syslog Socket.
Stopping Network Name Resolution...
Stopping Network Time Synchronization...
[ OK ] Stopped Network Name Resolution.
[ OK ] Stopped Network Time Synchronization.
Stopping Network Service...
[ OK ] Stopped Create Volatile Files and Directories.
[ OK ] Stopped target Local File Systems.
Unmounting Temporary Directory (/tmp)...
Unmounting /var/volatile...
[ OK ] Stopped Network Service.
[ OK ] Unmounted Temporary Directory (/tmp).
[ OK ] Unmounted /var/volatile.
[ OK ] Stopped target Local File Systems (Pre).
[ OK ] Stopped target Swap.
[ OK ] Reached target Unmount All Filesystems.
[ OK ] Stopped Remount Root and Kernel File Systems.
[ OK ] Stopped Apply Kernel Variables.
[ OK ] Stopped Load Kernel Modules.
[ OK ] Stopped Create Static Device Nodes in /dev.
[ OK ] Reached target Shutdown.
[ OK ] Reached target Final Step.
[ OK ] Started Power-Off.
[ OK ] Reached target Power-Off.
[ 15.911216] systemd-shutdown[1]: Syncing filesystems and block devices.
[ 15.920832] systemd-shutdown[1]: Sending SIGTERM to remaining processes...
[ 15.936588] systemd-journald[247]: Received SIGTERM from PID 1 (systemd-shutdow).
[ 15.959340] systemd-shutdown[1]: Sending SIGKILL to remaining processes...
[ 15.975454] systemd-shutdown[1]: Unmounting file systems.
[ 15.982656] [353]: Remounting '/' read-only in with options '(null)'.
[ 16.020576] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[ 16.031646] systemd-shutdown[1]: All filesystems unmounted.
[ 16.037301] systemd-shutdown[1]: Deactivating swaps.
[ 16.042421] systemd-shutdown[1]: All swaps deactivated.
[ 16.047678] systemd-shutdown[1]: Detaching loop devices.
[ 16.055830] systemd-shutdown[1]: All loop devices detached.
[ 16.061424] systemd-shutdown[1]: Detaching DM devices.
[ 16.066794] systemd-shutdown[1]: All DM devices detached.
[ 16.072226] systemd-shutdown[1]: All filesystems, swaps, loop devices and DM devices detached.
[ 16.086744] systemd-shutdown[1]: Syncing filesystems and block devices.
[ 16.093483] systemd-shutdown[1]: Powering off.
[ 16.097961] kvm: exiting hardware virtualization
[ 16.097991] imx-sdma 30bd0000.sdma: external firmware not found, using ROM firmware
[ 16.098546] cfg80211: failed to load regulatory.db
[ 16.101341] imx-sdma 302c0000.sdma: loaded firmware 4.5
[ 16.166426] mwifiex_pcie 0000:01:00.0: info: shutdown mwifiex...
[ 16.173169] mwifiex_pcie 0000:01:00.0: PREP_CMD: card is removed
[ 16.240963] mwifiex_pcie 0000:01:00.0: performing cancel_work_sync()...
[ 16.247595] mwifiex_pcie 0000:01:00.0: cancel_work_sync() done
[ 16.288309] reboot: Power down
Then pressing POWER button again:
U-Boot 2020.04-imx_v2020.04_5.4.24_2.1.0+g4979a99482 (May 30 2020 - 06:50:01 +0000) CPU: i.MX8MQLite rev2.1 1300 MHz (running at 800 MHz) CPU: Industrial temperature grade (-40C to 105C) at 62C Reset cause: POR Model: Voipac i.MX8MQ EVK DRAM: 2 GiB MMC: FSL_SDHC: 0, FSL_SDHC: 1 Loading Environment from MMC... OK [*]-Video Link 0imx8m_hdmi_probe ....
CAN
Input: None
Output: Device driver is available
root@imx8mq-voipac:~# ip addr show dev can0
1: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10
link/can
To setup can interface to 500kB bitrate use following command:
ip link set can0 type can bitrate 500000
Camera Input
Input: Connect RPi camera module into CSI interface and check if it is detected on I2C bus
Output: I2C address 0x36 is occupied and under use
Note: HDMI monitor may cause I2C communication issues
root@imx6-openrexultra:~# i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- UU -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- UU -- -- -- -- -- -- -- -- --
40: UU -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
50: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
Input: Connect RPi camera into CSI interface and check kernel modules
Output: Device driver ov5647_camera_mipi_int(or ov5647_camera_mipi) is loaded
root@imx6-openrexultra:~# lsmod Module Size Used by mxc_v4l2_capture 27362 1 ipu_bg_overlay_sdc 5230 1 mxc_v4l2_capture ipu_still 2304 1 mxc_v4l2_capture ipu_prp_enc 5864 1 mxc_v4l2_capture ipu_csi_enc 3807 1 mxc_v4l2_capture ipu_fg_overlay_sdc 6056 1 mxc_v4l2_capture lm75 4768 0 sht21 2126 0 ov5647_camera_mipi_int 30415 0 v4l2_int_device 2897 3 ov5647_camera_mipi_int,ipu_csi_enc,mxc_v4l2_capture at24 5488 0 fxas2100x 6680 0 fxos8700 9014 0 mxc_dcic 6536 0 iwl4965 88394 0 iwlegacy 62850 1 iwl4965 galcore 226429 2
Input: Connect RPi camera module into CSI interface and capture image
Output: The image is displayed on HDMI monitor
root@imx6-openrexultra:~# echo 2 > /sys/bus/i2c/devices/1-0036/ov5647_mode root@imx6-openrexultra:~# gst-launch-1.0 v4l2src device="/dev/video0" ! video/x-bayer,width=1920,height=1080,framerate=30/1 ! queue ! bayer2rgb ! videoconvert ! fbdevsink Setting pipeline to PAUSED ... Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock ERROR: v4l2 capture: unsupported ioctrl! ERROR: v4l2 capture: unsupported ioctrl! WARNING: from element /GstPipeline:pipeline0/GstFBDEVSink:fbdevsink0: A lot of buffers are being dropped. Additional debug info: /home/marek/workdir/imx6/yocto/fsl-release-bsp-4.1/build-x11/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/gstreamer1.0/1.6.0-r0/gstreamer-1.6.0/libs/gst/base/gstbasesink.c(2846): gst_base_sink_is_too_la: There may be a timestamping problem, or this computer is too slow. mxc_hdmi 20e0000.hdmi_video: Read EDID again mxc_hdmi 20e0000.hdmi_video: create default modelist EVENT plugin WARNING: from element /GstPipeline:pipeline0/GstFBDEVSink:fbdevsink0: A lot of buffers are being dropped. Additional debug info: /home/marek/workdir/imx6/yocto/fsl-release-bsp-4.1/build-x11/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/gstreamer1.0/1.6.0-r0/gstreamer-1.6.0/libs/gst/base/gstbasesink.c(2846): gst_base_sink_is_too_la: There may be a timestamping problem, or this computer is too slow. ^Chandling interrupt. Interrupt: Stopping pipeline ... Execution ended after 0:00:27.103901670 Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... Freeing pipeline ... power_down_callback: ipu0/csi1
Alternative test
Input: Connect RPi camera module into CSI interface and capture image
Output: The image is displayed on HDMI monitor
root@imx6-openrexultra:~# echo 1 > /sys/bus/i2c/devices/1-0036/ov5647_mode root@imx6-openrexultra:~# gst-launch-1.0 v4l2src device="/dev/video0" ! video/x-bayer,width=1280,height=720,framerate=30/1 ! queue ! bayer2rgb ! videoconvert ! fbdevsink Setting pipeline to PAUSED ... Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock ERROR: v4l2 capture: unsupported ioctrl! ERROR: v4l2 capture: unsupported ioctrl! WARNING: from element /GstPipeline:pipeline0/GstFBDEVSink:fbdevsink0: A lot of buffers are being dropped. Additional debug info: /home/marek/workdir/imx6/yocto/fsl-release-bsp-4.1/build-x11/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/gstreamer1.0/1.6.0-r0/gstreamer-1.6.0/libs/gst/base/gstbasesink.c(2846): gst_base_sink_is_too_la: There may be a timestamping problem, or this computer is too slow. ^Chandling interrupt. Interrupt: Stopping pipeline ... Execution ended after 0:00:06.514209667 Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... Freeing pipeline ... root@imx6-openrexultra:~# power_down_callback: ipu0/csi1
Software integration and additional commands or settings of CSI camera interface are available on separate iMX6 OpenRex Camera page.
Ethernet
Input: None
Output: Device driver is available
Note: MAC address should be identical with the address on the sticker placed on the board
root@imx8mq-voipac:~# ip addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:0d:15:01:50:92 brd ff:ff:ff:ff:ff:ff
inet 192.168.10.122/24 brd 192.168.10.255 scope global dynamic eth0
valid_lft 86103sec preferred_lft 86103sec
inet6 fe80::20d:15ff:fe01:5092/64 scope link
valid_lft forever preferred_lft forever
Input: Plug Ethernet cable into connector
Output: IPv4 address is assigned
root@imx6-openrexultra:~# dmesg | tail ... [ 348.300585] fec 30be0000.ethernet eth0: Link is Down [ 350.350853] fec 30be0000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off
HDMI Output
Input: Connect LCD monitor to the SBC
Output: Desktop UI is displayed correctly
User LED
Input: None
Output: Script switches User LED ON and OFF in one second intervals
root@imx8mq-voipac:~#
for LED in /sys/class/leds/user
do
echo Testing ${LED}
echo -n "1" > ${LED}/brightness
sleep 1
echo -n "0" > ${LED}/brightness
sleep 1
done
Input: None
Output: User LED is set to heartbeat blinking sequence
root@imx8mq-voipac:~# echo heartbeat > /sys/class/leds/user/trigger