Pairs with stm32-hal-vcu PR #42. Adds a runtime "vcuchglim" param that
the VCU broadcasts every 200 ms; on receipt, the param's Change()
callback translates 20-100% to the charger's udcspnt (DC voltage
setpoint) using a linear cell-voltage ramp.
Without this, the teslacharger had no path for the user's app-set
charge limit to actually limit charging — udcspnt was effectively
a compile-time setpoint.
What's added
------------
- Param::vcuchglim in include/param_prj.h:
PARAM_ENTRY(CAT_CHARGER, vcuchglim, "%", 20, 100, 80, 23)
- Range 20-100 (matches VCU validation)
- Default 80% if VCU never connects
- ID 23 (next free per the comment, bumped to 24)
- Saveable so a flashed charger paired with a silent VCU still
behaves predictably across reboots
- can->AddRecv(Param::vcuchglim, 0x212, 0, 8, 1) registration in
ChargerCAN::MapMessages() — libopeninv's CanMap dispatches to the
Change() callback on each received frame.
- Param::Change(vcuchglim) handler in src/main.cpp:
cell_target = 3.30 + (4.15 - 3.30) * (pct - 20) / 80
udcspnt = cell_target * 96
Endpoints chosen to be safe across Tesla LDU / VW MEB / Volt2:
20% → 3.30 V/cell × 96 = 316.8 V (deep-cycle storage floor)
80% → 3.94 V/cell × 96 = 378.0 V (recommended daily ceiling)
100% → 4.15 V/cell × 96 = 398.4 V (matches existing udclim default)
Tuneable here as constants if a particular pack needs a tighter range.
- VER bump 1.19.R → 1.20.R. Combined with the pre-existing -S1 suffix
the OI web UI shows "4=1.20.R-S1", visually distinct from upstream
and from the previous Skudak build.
Build
-----
text=25288, links clean. The "RWX LOAD segment" linker warning is
pre-existing on this template, unrelated. No new warnings from this
change.
Version string in the binary verified as "4=1.20.R-S1".
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
The OpenInverter web UI displays the firmware version from the 'version'
parameter (entry 2001), which expands VERSTR. Out of the box this reads
'4=1.19.R' (upstream version, no Skudak indicator). With this change it
reads '4=1.19.R-S1' so we can visually confirm we're running the Skudak
fork and not stock OpenInverter firmware.
Matches the convention already used in stm32-sine ('-sine-S6' / '-foc-S6')
where the -S<N> suffix bumps on each Skudak-side change.
Verified: 'strings stm32_charger.bin | grep S1' shows '4=1.19.R-S1' in the
built artifact.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Bastian de Byl