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Sweetberry USB power monitoring
This tool allows high speed monitoring of power rails via a special USB
endpoint. Currently this is implemented for the sweetberry baord.
To use on a board, you'll need two config files, one describing the board,
a ".board" file, and one describing the particular rails you want to
monitor in this session, a ".scenario" file.
Converting from servo_ina configs:
Many configs can be found for the servo_ina_board in hdctools/servo/data/.
Sweetberry is plug compatible with servo_ina headers, and config files
can be converted with the following tool:
./convert_servo_ina.py kevin_r0_loc.py
This will produce kevin_r0_loc.board and kevin_r0_loc.scenario which
can be used with powerlog.py.
Board files:
Board files contain a list of rails, supporting 48 channels each on up to two
sweetberries. For each rail you must specify a name, sense resistor value,
and channel number. You can optionally list expected voltage and net name.
The format is as follows, in json:
example.board:
[
{ "name": "railname",
"rs": <sense resistor value in ohms>,
"sweetberry": <"A" for main sweetberry, "B" for a secondary sweetberry>,
"channel": <0-47 according to board schematic>,
"v": <optional expected bus voltage in volts>,
"net": <optional schematic net name>
},
{...}
]
Scenario files:
Scenario files contain the set of rails to monitor in this session. The
file format is simply a list of rail names from the board file.
example.scenario:
[
"railname",
"another_railname",
...
]
Output:
powerlog.py will output a csv formatted log to stdout, at timing intervals
specified on the command line. Currently values below "-t 10000" do not work
reliably but further updates should allow faster updating.
An example run of:
./powerlog.py -b board/marlin/marlin.board -c board/marlin/marlin_short.scenario -t 100000
Will result in:
ts:32976us, VBAT uW, VDD_MEM uW, VDD_CORE uW, VDD_GFX uW, VDD_1V8_PANEL uW
0.033004, 12207.03, 4882.81, 9155.27, 2441.41, 0.00
0.066008, 12207.03, 3662.11, 9155.27, 2441.41, 0.00
0.099012, 12207.03, 3662.11, 9155.27, 2441.41, 0.00
...
The output format is as follows:
ts:32976us: Timestamps either zero based or synced to system clock,
in seconds. The column header indicates the selected
sampling interval. Since the INA231 has specific
hardware defines sampling options, this will be the
closest supported option lower than the requested "-t"
value on the command line.
VBAT uW: microwatt reading from this rail, generated on the INA
by integrating the voltage/amperage on the sense resistor
over the sampling time, and multiplying by the sampled bus
voltage.
... uW: Further microwatt entry columns for each rail specified in
your scenario file.
Calculate stats and store data and stats:
When appropriate flag is set, powerlog.py is capable of calculating statistics
and storing statistics and raw data.
Example 1:
./powerlog.py -b board/eve_dvt2_loc/eve_dvt2_loc.board -c board/eve_dvt2_loc/eve_dvt2_loc.scenario --save_stats [<directory>]
If <directory> is specified, this will save stats as:
<directory>/sweetberry<timestemp>/summary.txt
If <directory> does not exist, it will be created.
If <directory> is not specified but the flag is set, this will save stats under
the directory which powerlog.py is in:
<directory of powerlog.py>/sweetberry<timestemp>/summary.txt
If --save_stats flag is not set, stats will not be saved.
Example 2:
./powerlog.py -b board/eve_dvt2_loc/eve_dvt2_loc.board -c board/eve_dvt2_loc/eve_dvt2_loc.scenario --save_raw_data [<directory>]
If <directory> is specified, this will save raw data in:
<directory>/sweetberry<timestemp>/raw_data/
If <directory> does not exist, it will be created.
If <directory> is not specified but the flag is set, this will save raw data
under the directory which powerlog.py is in:
<directory of powerlog.py>/sweetberry<timestemp>/raw_data/
If --save_raw_data flag is not set, raw data will not be saved.
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