target is to use orange pi board to read vems data for realtime data over ser2net or dataloging trigger frame stream to vemslog format saved to filesystem (SD, or /dev/shm tmpfs, or network filesystem, or SSD, or rust).
Experimental binaries (primary target: armhf or occasionally unsupported aarch64/x86/x86_64 or amd64)
http://vems.hu/download/arm/orangepi_main/
current board: Orange pi lite (H3, armhf)
OS Armbian Ubuntu Desktop : https://www.armbian.com/download/
to connect it to vems we need to have serial port on the board, it has some UARTS but they are ttl level, so we need some max232 interface.
using one like that : http://www.dx.com/p/rs232-to-ttl-serial-communications-module-w-indicator-blue-black-221240#.WVLg6GiGNdg
using UART3 to connect it: 
to get it working we need to change orange configuration in /boot, link how to do that : https://forum.armbian.com/index.php?/topic/1524-orange-pi-one-how-to-enable-uart/
best way to test it is to download minicom and try to capture some aim data from vems serial port, in my case i had to swap rx and tx wires on serial cable which connects between vems and raspberry. both ends of the cable are female gender.
at the moment I'm using orange to have wireless connection for the ecu on test bench using ser2net
config file is located in /etc/ser2net.conf and has line 4400:raw:1000:/dev/ttyS3:19200 8DATABITS NONE 1STOPBIT banner
/etc/fstab
- The achilles heel of an embedded system is the SD-card
- setup fstab and write to separate partition, not to boot or root fs
- in the end, make root ro is best (might need some tests, but after that the system lifetime might be tripled).
http://vems.hu/download/arm/orangepi_main/
- tune2fs -l /dev/sda5 | grep 'Last write time'
- Last write time: Sun Jul 9 15:30:23 2017
- date -s ... could be done according to that, to have monotonous time after reboots (without RTC, and even if NTP servers not reachable)
- (possibly also considering Lifetime writes)
Test simple built binary, linking and serial port
- download from http://vems.hu/download/arm/orangepi_main/ and unzip if necessary
- chmod +x orangepi_main
- see Checklist below if needed (skip if all goes well)
- ./orangepi_main /dev/ttyS0 | tee /dev/shm/dummy
- It opens both specified serial ports at 19200 baud, and reads data received and prints to outputfile orangepi_main
- only a test: indistinguishable which input the data is coming from (please also see CPU consumption, eg. top; if success is reported, the working stm32 sources that query v3 via triggerframe and saves VemsTune compatible .vemslog file will be linked in).
- Binary built on xenial armhf (32bit) orangepi H3 pc-plus
- similar to orangepi-PC or zero or lite: zero or lite have builtin wifi, and might be perfect to log and send data over mobile-net.
- orangepi_main: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-armhf.so.3, for GNU/Linux 3.2.0, BuildID[sha1]=c2f3c15e6c7d2d228dc4a638bb205d1ae6dd15c0, not stripped in hex
- ldd orangepi_main
- libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0xb6eaa000)
- /lib/ld-linux-armhf.so.3 (0xb6f96000)
- might also run on 32bit armhf Debian jessie, or even buildroot, or possibly 32bit raspberry (not a target currently, devels use and have all kinds of orangepi-s but only 64 bit raspberry)
- easy to build on aarch64 orangepi pc2 if necessary (although gigabit ethernet is hardly necessary in a vehicle logger/network proxy device), and no other advantage apparently.
made test, got data moving without erors, uploaded results file: https://www.sendspace.com/file/5h7oiy
- armhf or aarch64 are the "usual" (Linux GNU) arm binaries
- x86 or x86_64 are what they sound.
- Unzip if necessary
- ldd binary_program
- shows .so shared object ("dll") dependencies except if binary is for another architecture. Some NOT_FOUND means library not present (although currently only using the most basic libraries):
- linux-gate.so.1
- libc.so.6 => /lib/i386-linux-gnu/i686/cmov/libc.so.6
- /lib/ld-linux.so.2
./orangepi_main /dev/ttyUSB0 > /tmp/err 2>&1
zip the err file (and the NOSERIAL-2017.07.09-14.25.24.vemslog) before uploading for any report.
- The filename currently has proper UTC timestamp
- which avoids anomalies related to daylight saving and comparison of timestamps captured with different timezone settings.
- v3 serial number (v3.3u_......) instead of NOSERIAL means ECU serialnr is properly queried and saved
Checklist - useful initally for review / debug / inspection or for curious geeks. Not needed if/when all goes perfectly.
- date ... check the time, use date -s ... if dummy (happens when neither ntp, neither RTC is available)
- TODO: some script called from linux rc.local could make sure timestamps are at least monotonous (later means later) ... eg based on tune2fs -l
Sniff the serial stream: PC to v3 direction is used to query data with TF commands (HDLC-7D-7E escaped and 7E between frames)
TF command to query runtime data is A0, it appears regularly (as a0 bf 38, see below)
TF Commands used to query ECU config pages:
<PRE>
marcell@mini:/svn/stm32/orangepi_fat$ grep TF2 /tmp/err | sort
TF2: 00 f4
TF2: 01 f4
TF2: 02 f4
TF2: 03 f4
TF2: 04 f4
TF2: 06 f4
TF2: 07 f4
TF2: 08 f4
TF2: 0a f4
TF2: 0c f4
TF2: 0d f4
TF2: 0e f4
TF2: 0f f4
TF2: 11 f4
TF2: 02 f2
TF2: 03 f2
TF2: 04 f2
TF2: 05 f2
Or the complete hex stream:
000022f0: 17 7e ff 00 f4 40 77 7e ff 02 f4 41 17 7e ff 04
00002300: f4 42 b7 7e ff 0f f4 45 87 7e ff 03 f4 40 87 7e
00002310: ff 0c f4 45 77 7e ff 0d f4 44 e7 7e ff 11 f4 4c
00002320: 27 7e ff 06 f4 43 d7 7e ff 07 f4 42 47 7e a0 bf
00002330: 38 7e a0 bf 38 7e a0 bf 38 7e a0 bf 38 7e a0 bf
00002340: 38 7e a0 bf 38 7e a0 bf 38 7e a0 bf 38 7e a0 bf
00002350: 38 7e a0 bf 38 7e a0 bf 38 7e a0 bf 38 7e a0 bf
</PRE>
Inspecting the vemslog file saved to filesystem:
hexdump -C NOSERIAL-2017.07.09-16.30.49.vemslog |less
tried to get it working:
root@orangepilite:/mnt/logger# ldd orangepi_main test2.armhf
orangepi_main:
libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0xb6eca000)
/lib/ld-linux-armhf.so.3 (0xb6fc7000)
test2.armhf:
libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0xb6e39000)
/lib/ld-linux-armhf.so.3 (0xb6f36000)
executed program, tried with /dev/ttyS3 first, later plugged one usb serial converter and that's what I got in the log.
root@orangepilite:/mnt/logger# ./orangepi_main /dev/ttyUSB0 > /tmp/err 2>&1
root@orangepilite:/mnt/logger# cat /tmp/err
attempt open serial /dev/ttyUSB0
attempt open serial /dev/ttyS0
/dev/ttyS1: No such file or directory
seems like there is some hardcoded interfaces in the main file, in my case I'm using only /dev/ttyS3