iMX6 TinyRex Ultra Accessing and Testing Peripherals

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Elemental operations of iMX6 TinyRex Development board ports in Ultra configuration are shown on this page. For more detailed information such as HDMI input interface or Wireless operation refer to the dedicated Peripheral sections.

Prerequisites

Hardware

  • DC power supply (5V 2A)
  • iMX6 TinyRex Module Ultra
  • iMX6 TinyRex Baseboard

Peripherals and Accessories

  • 1x FullHD monitor with Audio output
  • 1x HD signal generator
  • 1x MicroSD card
  • 1x MiniPCIe WiFi card
  • 1x RPi camera module
  • 1x SATA HDD drive
  • 2x USB FLASH drive

Cables

  • Ethernet cable
  • HDMI cable
  • Micro HDMI cable
  • Micro USB cable
  • USB to UART cable

User button

Input: Press the USER button
Output: Button events 1 and 0 are generated 

root@imx6-tinyrexultra:~# evtest /dev/input/by-path/platform-gpio-keys*-event
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100pio-keys.16-event .
Input device name: "gpio-keys.16"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 116 (KEY_POWER)
Properties:
Testing ... (interrupt to exit)
Event: time 1453240251.571826, type 1 (EV_KEY), code 116 (KEY_POWER), value 1
Event: time 1453240251.571826, -------------- EV_SYN ------------
Event: time 1453240251.711820, type 1 (EV_KEY), code 116 (KEY_POWER), value 0
Event: time 1453240251.711820, -------------- EV_SYN ------------

Reset button

Input: Press the RESET button
Output: Module will execute bootloader immediately with "Reset cause: POR"
Note: Module should never freeze or hang after the reset button was pressed. Testing the operations 10 times gives a reliable result 

U-Boot 2014.10 (Jan 19 2016 - 20:37:48)

CPU:   Freescale i.MX6SOLO rev1.1 at 792 MHz
Reset cause: POR
Board: MX6 TinyRex - basic
I2C:   ready
DRAM:  512 MiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   FEC [PRIME]
Hit any key to stop autoboot:  0

CAN

Input: None
Output: Device driver is available 

root@imx6-tinyrexbasic:~# ip addr show dev can0
2: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10
    link/can


Note: Enhanced testing can be performed with a pair of iMX6 TinyRex Development boards and a couple of dedicated CAN evaluation modules

Board 1 (receiver) commands and outputs: 

root@imx6-tinyrexmax:~# ip link set can0 type can bitrate 1000000
root@imx6-tinyrexmax:~# ip link set can0 up
flexcan 2090000.flexcan can0: writing ctrl=0x01232054
root@imx6-tinyrexmax:~# candump can0 &
[1] 833
root@imx6-tinyrexmax:~#   can0  123   [4]  DE AD BE EF

Board 2 (transmitter) commands and outputs: 

root@imx6-tinyrexpro:~# ip link set can0 type can bitrate 1000000
root@imx6-tinyrexpro:~# ip link set can0 up
flexcan 2090000.flexcan can0: writing ctrl=0x01232054
root@imx6-tinyrexpro:~# candump can0 &
[1] 847
root@imx6-tinyrexpro:~# cansend can0 123#DEADBEEF
root@imx6-tinyrexpro:~#   can0  123   [4]  DE AD BE EF

CSI

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 

root@imx6-tinyrexbasic:~# i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- UU -- -- -- 3a -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: 50 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --


Input: Connect RPi camera module into CSI interface and check kernel modules
Output: Device driver ov5647_camera_mipi_int(or ov5647_camera_mipi) is loaded 

root@imx6-tinyrexbasic:~# lsmod
Module                  Size  Used by
mxc_v4l2_capture       28532  2 
ipu_bg_overlay_sdc      5401  1 mxc_v4l2_capture
ipu_still               2528  1 mxc_v4l2_capture
ipu_prp_enc             5943  1 mxc_v4l2_capture
ipu_csi_enc             3863  1 mxc_v4l2_capture
ipu_fg_overlay_sdc      6217  1 mxc_v4l2_capture
ov5647_camera_mipi     30980  0 
adv7610_video           6270  0 
v4l2_int_device         2930  3 ov5647_camera_mipi_int,adv7610_video,mxc_v4l2_capture
mxc_dcic                6569  0 
evbug                   1875  0


Input: Connect RPi camera module into CSI interface and capture image
Output: The image is displayed on LCD panel 

root@imx6-tinyrexbasic:~# echo 2 > /sys/bus/i2c/devices/1-0036/ov5647_mode 
root@imx6-tinyrexbasic:~# gst-launch-1.0 v4l2src device="/dev/video1" ! video/x-bayer,width=1920,height=1080,framerate=30/1 ! queue ! bayer2rgb ! videoconvert ! fbdevsink
display(/dev/fb0) resolution is (1920x1080).
ipu_csi_window_size_crop: Error left=0 top=56595559
ERROR: unrecognized std! 0 (PAL=ff, NTSC=b000

(gst-plugin-scanner:1175): GStreamer-CRITICAL **: gst_caps_simplify: assertion 'GST_IS_CAPS (caps)' failed

(gst-plugin-scanner:1175): GStreamer-CRITICAL **: gst_caps_append: assertion 'GST_IS_CAPS (caps2)' failed

(gst-plugin-scanner:1175): GStreamer-CRITICAL **: gst_caps_simplify: assertion 'GST_IS_CAPS (caps)' failed

(gst-plugin-scanner:1175): GStreamer-CRITICAL **: gst_caps_append: assertion 'GST_IS_CAPS (caps2)' failed
ipu_csi_window_size_crop: Error left=0 top=56595559
ipu_csi_window_size_crop: Error left=0 top=56595559
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
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-tinyrex/build-x11/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/gstreamer1.0/1.4.1-r0/gstreamer-1.4.1/libs/gst/base/gstbasesin:
There may be a timestamping problem, or this computer is too slow.
power_down_callback: ipu0/csi0
^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:00:19.269515335
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...
power_down_callback: ipu0/csi1

Input:
Output: 





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