[Ovmsdev] Porting code from v2 to v3

[Michael Balzer]

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openvehicles.com/pipermail/ovmsdev/attachments/20180726/de30104b/attachment.htm>