[Ovmsdev] Porting code from v2 to v3

Sun Jul 29 05:42:13 HKT 2018

 Thank you!Yes the carid is TC003. I was not running anything extraordinary - just followed the developer tutorial, but never flashed directly - always flashed from edge branch OTA. I will run the commands and provide output, but it will be with the newer firmware. I will need to see if updating will have same problems. 

    On Friday, July 27, 2018, 3:07:09 AM GMT+2, Mark Webb-Johnson <mark at webb-johnson.net> wrote:  

 Note that I store the .elf files alongside the .bin, for edge/eap/main builds.
For example:

http://api.openvehicles.com/firmware/ota/v3.1/edge/3.1.008-29-gaf41242.ovms3.elf

Regards, Mark.

On 27 Jul 2018, at 5:51 AM, Michael Balzer <dexter at expeedo.de> wrote:

 Nikolay,

 you need to keep the .elf files for your builds to be able to analyze a backtrace. Do not use addr2line, it shows wrong line numbers. Use the script "a2l" I posted previously (I'll include it again below). Just feed it the .elf file and the backtrace. Example:

 a2l tmp/3.1.008-32-g2fa3ab8-elf/ovms3.elf 0x400dc8ec 0x4008f43d 0x4008e181 0x400818cc 0x40082163 0x40083c4d 0x400dc8e9

 (I don't have the -28- version, so my output doesn't make sense)

 @Mark: spurious task WDT crashes and heap corruption crashes still occur, but it seems they have become less often with the internal RAM rework.

 How is performance and power usage affected when using StandardMetrics.xxxxx->SetValue in the IncomingFrameCan1 method? Most of the messages update value every 100ms, and except maybe speed, battery current and voltage, most of the parameters are not changing that often. And even for the speed, current and voltage, it is probably enough to update StandardMetrics in the 1 second ticker... does this make sense or is the difference non-existing.  

 Extending Mark's answer:

 It's normally OK to directly set metrics from IncomingFrameCan1(), but be aware metrics listeners will be executed synchronously in the context that changes the metric.

 Standard metrics listeners are now for example the automatic notification generators in the vehicle base class. These may need quite some stack and time.

 If you spend too much time handling frames on a high volume bus, your vehicle task may lose frames. It's possible to raise the queue size (currently 20 frames) and the vehicle task stack size, but it's better to keep the CAN processing simple.

 TL;DR: if you need to handle many CAN frames, I recommend changing metrics that trigger notifications or other complex actions from the ticker. If you encounter crashes on some CAN frames that may be due to the vehicle task stack being too small (CONFIG_OVMS_VEHICLE_RXTASK_STACK=6144).

 Regards,
 Michael

 Script a2l:

 #!/bin/bash
 elf=~/esp/Open-Vehicle-Monitoring-System-3/vehicle/OVMS.V3/build/ovms3.elf
 for adr in $* ; do
   if [[ "$adr" =~ "elf" ]] ; then
     elf="$adr"
   else
     cmd+=" -ex 'l *$adr'"
   fi
 done
 cmd+=" -ex 'q'"
 echo "Using elf file: $elf"
 eval xtensa-esp32-elf-gdb -batch $elf $cmd 2>/dev/null #| grep "^0x.* is in "

 Am 26.07.2018 um 09:59 schrieb Nikolay Shishkov:

 Quick update: I managed to do a not so quick update on one of the ovms v.3 boxes that sits in a Think and can confirm that the porting seems to work.  I could see speed, parking time, ambient temperature. 
  I had very strange problems doing the OTA update. The firmware start download and I can see the messages progressing, but it would halt in between 700kB and 1600kB and then stay there until I refresh the browser.  And when I refresh the browser I am asked of my password which leads me to that there must have been a crash in the meantime.  
  I was finally able to get the OTA update work by disconnecting the box from the car and powering it via USB. This is a single data point but it kind of points to a problem with the code that communicates with the car.  
  I was not able to get a laptop connected to checkout the console, but managed to get the following log - not sure how to interpret it.    Last boot was 87 second(s) ago Time at boot: 2018-07-25 18:07:43 GMT This is reset #3 since last power cycle Detected boot reason: Crash (12/12) Crash counters: 3 total, 0 early 
  Last crash: Alloca exception on core 0 Registers: PC : 0x400dc8ec PS : 0x00060234 A0 : 0x8008f440 A1 : 0x3ffc45b0 A2 : 0x00000020 A3 : 0x00000001 A4 : 0x00000000 A5 : 0x3ffb44b8 A6 : 0x3ffb47e4 A7 : 0x3ffb458c A8 : 0x3ffb44d4 A9 : 0x3ffc4590 A10 : 0x00000000 A11 : 0x7fffffff A12 : 0x8008e65b A13 : 0x3ffcc450 A14 : 0x00000003 A15 : 0x00060023 SAR : 0x00000000 EXCCAUSE: 0x00000005 EXCVADDR: 0x00000000 LBEG : 0x00000000 LEND : 0x00000000 LCOUNT : 0x00000000 Backtrace: 0x400dc8ec 0x4008f43d 0x4008e181 0x400818cc 0x40082163 0x40083c4d 0x400dc8e9 Version: 3.1.008-29-gaf41242/ota_1/edge (build idf v3.1-dev-987-g55d915e Jul 6 2018 00:14:59) Running partition: ota_1 Boot partition: ota_1 Firmware: 3.1.008-29-gaf41242/ota_1/edge (build idf v3.1-dev-987-g55d915e Jul 6 2018 00:14:59)  
  How is performance and power usage affected when using StandardMetrics.xxxxx->SetValue in the IncomingFrameCan1 method? Most of the messages update value every 100ms, and except maybe speed, battery current and voltage, most of the parameters are not changing that often. And even for the speed, current and voltage, it is probably enough to update StandardMetrics in the 1 second ticker... does this make sense or is the difference non-existing.  
  Thanks for all the hand holding and help,  Nikolay  
   -- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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