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 button
Input: Press Home/Back-/Menu+ 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 2015.10+fslc+g7d8ddd7 (Dec 15 2016 - 18:52:24 +0100) CPU: Freescale i.MX6QUAD rev1.1 996 MHz (running at 792 MHz) CPU: Extended Commercial temperature grade (-20C to 105C) at 44C Reset cause: POR Board: iMX6-OpenRex I2C: ready DRAM: 512 MiB MMC: FSL_SDHC: 0 SF: Detected SST26VF032B with page size 256 Bytes, erase size 4 KiB, total 4 MiB In: serial Out: serial Err: serial Net: FEC [PRIME] Hit any key to stop autoboot: 0 OpenRex U-Boot>
CAN
Input: None
Output: Device driver is available
root@imx6-openrexultra:~# ip addr show dev can0
2: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10
link/can
root@imx6-openrexultra:~# ip addr show dev can1
3: can1: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10
link/can
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@imx6-openrexultra:~# ip addr show dev eth0
4: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0d:15:00:d1:75 brd ff:ff:ff:ff:ff:ff
Input: Plug Ethernet cable into connector and issue DHCP command
Output: IPv4 address is assigned
root@imx6-openrexultra:~# dmesg | tail ... fec 2188000.ethernet eth0: Link is Down fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off
root@imx6-openrexultra:~# udhcpc -i eth0 udhcpc (v1.23.2) started Sending discover... Sending discover... Sending select for 192.168.1.39... Lease of 192.168.1.39 obtained, lease time 600 /etc/udhcpc.d/50default: Adding DNS 192.168.1.1 /etc/udhcpc.d/50default: Adding DNS 192.168.1.2
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@imx6-openrexultra:~#
for LED in /sys/devices/soc0/leds*/leds/*
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@imx6-openrexultra:~# echo -n "heartbeat" > /sys/devices/soc0/leds*/leds/module-led/trigger