Difference between revisions of "iMX6 Rex Basic Accessing and Testing Peripherals"
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'''''Input:''''' Connect LCD monitor to base board<br /> | '''''Input:''''' Connect LCD monitor to base board<br /> | ||
'''''Output:''''' Desktop UI is displayed correctly <br /> | '''''Output:''''' Desktop UI is displayed correctly <br /> | ||
| − | [[image: | + | [[image:iMX6_TinyRex_Development_Kit-HDMI_terminal.png|580px]] |
== I2C == | == I2C == | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
| − | === | + | === Alternative test === |
'''''Input:''''' List I2C bus 1<br /> | '''''Input:''''' List I2C bus 1<br /> | ||
'''''Output:''''' Available devices are displayed | '''''Output:''''' Available devices are displayed | ||
Latest revision as of 11:43, 24 April 2022
Elemental operations of iMX6 Rex Development Kit interfaces in Basic configuration are shown on this page.
Prerequisites
Hardware
- DC power supply (12V, 1A)
- iMX6 Rex Module Basic
- iMX6 Rex Base Board
Peripherals and Accessories
- 1x FullHD monitor with Audio output
- 1x MicroSD card
- 2x USB FLASH drive
Cables
- Ethernet cable
- HDMI cable
- Micro USB cable
- RS-232 cable
User button
Input: Press and hold USER button (pca9535 driver is used)
Output: GPIO register is read and displayed state of the button
root@imx6-rexbasic:~# echo 511 > /sys/class/gpio/export root@imx6-rexbasic:~# echo in > /sys/class/gpio/gpio511/direction root@imx6-rexbasic:~# cat /sys/class/gpio/gpio511/value 1 root@imx6-rexbasic:~# cat /sys/class/gpio/gpio511/value 0
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 operation 10 times gives a reliable result
U-Boot 2014.10-dirty (Mar 12 2016 - 11:34:54) CPU: Freescale i.MX6Q rev1.2 at 792 MHz Reset cause: POR Board: MX6 Rex - basic I2C: ready DRAM: 2 GiB MMC: FSL_SDHC: 0, FSL_SDHC: 1 SF: Detected SST25VF032B with page size 256 Bytes, erase size 4 KiB, total 4 MiB *** Warning - bad CRC, using default environment In: serial Out: serial Err: serial Net: FEC [PRIME] Hit any key to stop autoboot: 0
Ethernet
Input: None
Output: Device driver is available
Note: MAC address should be identical with the address on the sticker placed on module
root@imx6-rexbasic:~# ip addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0d:15:00:cc:e2 brd ff:ff:ff:ff:ff:ff
inet6 fe80::20d:15ff:fe00:cce2/64 scope link
Input: Plug Ethernet cable into connector and issue DHCP command
Output: IPv4 address is assigned
root@imx6-rexbasic:~# dmesg | tail ... libphy: 2188000.ethernet:03 - Link is Up - 100/Full IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
root@imx6-rexbasic:~# udhcpc -i eth0 udhcpc (v1.22.1) started Sending discover... Sending select for 192.168.0.178... Lease of 192.168.0.178 obtained, lease time 600
HDMI Output
Input: Connect LCD monitor to base board
Output: Desktop UI is displayed correctly
I2C
Input: Scan I2C bus 1
Output: Available devices:
- GPIO expander (0x27)
- touchscreen TSC2007 (0x48)
- HDMI Output EDID (0x50)
- RTC clock (0x51)
- EEPROM (0x57)
Note: HDMI monitor must be disconnected otherwise I2C bus 1 scanning bus might freeze.
root@imx6-rexbasic:~# i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- 18 -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
50: UU UU -- -- -- -- -- UU -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
Input: Trigger I2C GPIO expander detection.
Output: GPIO expander is detected
root@imx6-rexbasic:~# echo -n "1-0027" > /sys/bus/i2c/drivers/pca953x/unbind root@imx6-rexbasic:~# echo -n "1-0027" > /sys/bus/i2c/drivers/pca953x/bind pca953x 1-0027: interrupt support not compiled in
Input: Trigger I2C RTC detection
Output: RTC is detected
root@imx6-rexbasic:~# echo -n "1-0051" > /sys/bus/i2c/drivers/rtc-pcf8563/unbind root@imx6-rexbasic:~# echo -n "1-0051" > /sys/bus/i2c/drivers/rtc-pcf8563/bind rtc-pcf8563 1-0051: chip found, driver version 0.4.3 rtc-pcf8563 1-0051: low voltage detected, date/time is not reliable. rtc-pcf8563 1-0051: low voltage detected, date/time is not reliable. rtc rtc1: invalid alarm value: 2030-10-20 41:58:0 rtc-pcf8563 1-0051: rtc core: registered rtc-pcf8563 as rtc1
Input: Trigger I2C EEPROM detection
Output: I2C EEPROM is detected
root@imx6-rexbasic:~# echo -n "1-0057" > /sys/bus/i2c/drivers/at24/unbind root@imx6-rexbasic:~# echo -n "1-0057" > /sys/bus/i2c/drivers/at24/bind at24 1-0057: 256 byte 24c02 EEPROM, writable, 1 bytes/write
Input: Write and read data from I2C EEPROM
Output: If successful, console text 'Data are the same' should appear
root@imx6-rexbasic:~# echo -n "0123" > eeprom_in root@imx6-rexbasic:~# cat eeprom_in > /sys/bus/i2c/devices/1-0057/eeprom root@imx6-rexbasic:~# head -c 4 /sys/bus/i2c/devices/1-0057/eeprom > eeprom_out root@imx6-rexbasic:~# diff eeprom_in eeprom_out && echo "Data are the same" Data are the same
Alternative test
Input: List I2C bus 1
Output: Available devices are displayed
root@imx6-rexbasic:~# ls /sys/bus/i2c/devices/i2c-1 | grep ^[1] 1-0048 1-0050
User LED
Input: None
Output: Red LED assembled on module switches from ON to OFF state with heartbeat pulses afterwards
root@imx6-rexbasic:~# echo -n "none" > /sys/devices/soc0/leds*/leds/module-led/trigger root@imx6-rexbasic:~# echo -n "1" > /sys/devices/soc0/leds*/leds/module-led/brightness root@imx6-rexbasic:~# echo -n "0" > /sys/devices/soc0/leds*/leds/module-led/brightness root@imx6-rexbasic:~# echo -n "heartbeat" > /sys/devices/soc0/leds*/leds/module-led/trigger
Input: GPIO expander PCA9535 driver
Output: Red LED assembled on the base board switches from ON to OFF state
root@imx6-rexbasic:~# echo 510 > /sys/class/gpio/export root@imx6-rexbasic:~# echo out > /sys/class/gpio/gpio510/direction root@imx6-rexbasic:~# echo 1 > /sys/class/gpio/gpio510/value root@imx6-rexbasic:~# echo 0 > /sys/class/gpio/gpio510/value
DDR memory
Input: None
Output: Memory test passes without any errors
root@imx6-rexbasic:~# memtester 2G 1 memtester version 4.1.3 (32-bit) Copyright (C) 2010 Charles Cazabon. Licensed under the GNU General Public License version 2 (only). pagesize is 4096 pagesizemask is 0xfffff000 want 2048MB (2147483648 bytes) got 267MB (280412160 bytes), trying mlock ...locked. Loop 1/1: Stuck Address : ok Random Value : ok Compare XOR : ok Compare SUB : ok Compare MUL : ok Compare DIV : ok Compare OR : ok Compare AND : ok Sequential Increment: ok Solid Bits : ok Block Sequential : ok Checkerboard : ok Bit Spread : ok Bit Flip : ok Walking Ones : ok Walking Zeroes : ok Done.
Further information about DDR3 memories and its calibration can be accessed in Memory Calibration details.
SD card
Bottom slot SD card (mmcblk2)
Input: Plug SD card with a filesystem and boot-up the module
Output: Module boots up successfully
root@imx6-rexbasic:~# dmesg | grep -i "Kernel command line" Kernel command line: console=ttymxc0,115200 root=/dev/mmcblk2p2 rootwait rw
SPI Flash Memory
Input: Trigger M25P80 flash detection
Output: SPI Flash sst25vf016b(sst25vf032b) is detected
root@imx6-rexbasic:~# echo -n "spi2.0" > /sys/bus/spi/drivers/m25p80/unbind root@imx6-rexbasic:~# echo -n "spi2.0" > /sys/bus/spi/drivers/m25p80/bind m25p80 spi2.0: found sst25vf032b, expected m25p32 m25p80 spi2.0: sst25vf032b (4096 Kbytes)
Input: Write and read data from M25P80 flash
Output: If successful, console text 'Data are the same' should appear
root@imx6-rexbasic:~# echo -n "0123" > mtd_in root@imx6-rexbasic:~# mtd_debug write /dev/mtd0 0 4 mtd_in Copied 4 bytes from mtd_in to address 0x00000000 in flash root@imx6-rexbasic:~# mtd_debug read /dev/mtd0 0 4 mtd_out Copied 4 bytes from address 0x00000000 in flash to mtd_out root@imx6-rexbasic:~# diff mtd_in mtd_out && echo "Data are the same" Data are the same
UART serial console
Input: Connect RS-232 cable into the base board connector and open serial console with baud rate 115200 8n1
Output: The board is controlled and responsive to serial terminal commands
root@imx6-rexbasic:~# uname -a Linux imx6-rexbasic 3.14.58-yocto+g11e5ba3 #1 SMP PREEMPT Sun Mar 13 20:20:31 CET 2016 armv7l GNU/Linux
USB
Input: Plug USB flash drive with single VFAT partition into the bottom USB connector
Output: Filesystem recognises the flash drive and automatically mounts it. SMC Hub with ID 0424:2514 is mounted
root@imx6-rexbasic:~# lsusb Bus 001 Device 003: ID 1bc7:0021 Telit HE910 Bus 001 Device 005: ID 054c:0243 Sony Corp. MicroVault Flash Drive Bus 001 Device 004: ID 0930:6544 Toshiba Corp. Kingston DataTraveler 2.0 Stick (2GB) Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub root@imx6-rexbasic:~# mount | grep /run/media/sd* /dev/sda1 on /run/media/sda1 type vfat (rw,relatime,gid=6,fmask=0007,dmask=0007,allow_utime=0020,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
Input: Generate a dummy file and copy it into USB flash drive
Output: Generated file and copied file have the same checksum
root@imx6-rexbasic:~# rm -f file.txt /run/media/sda1/file.txt root@imx6-rexbasic:~# dd if=/dev/urandom of=file.txt count=1024 bs=1024 1024+0 records in 1024+0 records out 1048576 bytes (1.0 MB) copied, 0.435456 s, 2.4 MB/s root@imx6-rexbasic:~# cp file.txt /run/media/sda1/ root@imx6-rexbasic:~# md5sum file.txt /run/media/sda1/file.txt 33ef96efccbbf570bfce477735ed2068 file.txt 33ef96efccbbf570bfce477735ed2068 /run/media/sda1/file.txt root@imx6-rexbasic:~# rm file.txt /run/media/sda1/file.txt
USB OTG
Input: Load USB serial gadget driver and connect base board to host PC over micro USB cable
Output: Driver is successfully loaded and host PC detects a new USB serial gadget device
iMX6 Rex Development Kit:
root@imx6-rexbasic:~# modprobe -i g_serial g_serial gadget: Gadget Serial v2.4 g_serial gadget: g_serial ready root@imx6-rexbasic:~# g_serial gadget: high-speed config #2: CDC ACM config
Host PC:
user@voipac:~$ lsusb ... Bus 001 Device 014: ID 0525:a4a7 Netchip Technology, Inc. Linux-USB Serial Gadget (CDC ACM mode) ...
Touchscreen
Input: Search kernel log for TSC2007 chip
Output: TSC2007 chip is detected and bound as an input device
root@imx6-rexbasic:~# dmesg | grep -i tsc2007 input: TSC2007 Touchscreen as /devices/soc0/soc.0/2100000.aips-bus/21a4000.i2c/i2c-1/1-0048/input/input0 evbug: Connected device: input0 (TSC2007 Touchscreen at 1-0048/input0)
Input: Press the touchscreen
Output: Touchscreen events are generated
root@imx6-rexbasic:~# evtest /dev/input/by-path/platform-21a4000.i2c-event
Input driver version is 1.0.1
Input device ID: bus 0x18 vendor 0x0 product 0x0 version 0x0
Input device name: "TSC2007 Touchscreen"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 330 (BTN_TOUCH)
Event type 3 (EV_ABS)
Event code 0 (ABS_X)
Value 3529
Min 0
Max 4095
Event code 1 (ABS_Y)
Value 375
Min 0
Max 4095
Event code 24 (ABS_PRESSURE)
Value 0
Min 0
Max 4095
Properties:
Testing ... (interrupt to exit)
Event: time 1457899907.959665, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 1
Event: time 1457899907.959665, type 3 (EV_ABS), code 0 (ABS_X), value 1657
Event: time 1457899907.959665, type 3 (EV_ABS), code 1 (ABS_Y), value 2486
Event: time 1457899907.959665, type 3 (EV_ABS), code 24 (ABS_PRESSURE), value 3268
Event: time 1457899907.959665, -------------- EV_SYN ------------
Event: time 1457899907.969094, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 0
Event: time 1457899907.969094, type 3 (EV_ABS), code 24 (ABS_PRESSURE), value 0
Event: time 1457899907.969094, -------------- EV_SYN ------------
Alternative test
Input: Press the touchscreen
Output: Touchscreen events are generated
root@imx6-rexbasic:~# hexdump -C /dev/input/event0 00000000 79 ca e5 56 cd a3 07 00 01 00 4a 01 01 00 00 00 |y..V......J.....| 00000010 79 ca e5 56 cd a3 07 00 03 00 00 00 2f 08 00 00 |y..V......../...| 00000020 79 ca e5 56 cd a3 07 00 03 00 01 00 a7 07 00 00 |y..V............| 00000030 79 ca e5 56 cd a3 07 00 03 00 18 00 64 06 00 00 |y..V........d...| 00000040 79 ca e5 56 cd a3 07 00 00 00 00 00 00 00 00 00 |y..V............| 00000050 79 ca e5 56 a7 c4 07 00 01 00 4a 01 00 00 00 00 |y..V......J.....| 00000060 79 ca e5 56 a7 c4 07 00 03 00 18 00 00 00 00 00 |y..V............| 00000070 79 ca e5 56 a7 c4 07 00 00 00 00 00 00 00 00 00 |y..V............|