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Author SHA1 Message Date
Stuart Longland
511309aa74
powerctl: Create one-second timer 
This creates a one-second timing event from the high-frequency timer for
less frequent events so we don't have to keep ticking down larger
numbers.
 2017-03-18 15:44:48 +10:00
Stuart Longland
c29736ca86
powerctl: Fix some debug typos 2017-03-18 15:22:35 +10:00
Stuart Longland
3341fcefdf
Makefile: Pass -DDEBUG if DEBUG=y 2017-03-18 15:22:18 +10:00
Stuart Longland
3db2e03807
powerctl: Re-locate high-voltage threshold check. 
If the charger is doing a bulk charge, it'll likely be dumping high
current into the battery, resulting in a high voltage appearing at the
terminals.

We don't want to disturb this… we want to wait until the charger thinks
it's done, which it signifies by turning off.  We should see the voltage
drop back and continue falling.  If we're above our "high" threshold at
this point, *then* we might consider leaving it off.
 2017-03-18 14:04:12 +10:00
Stuart Longland
312d21c01c
powerctl: Re-write battery charge control logic. 
See doc/flowdiag.png and
https://hackaday.io/project/10529-solar-powered-cloud-computing/log/54762-charge-control-flow-control-diagram
for details on how this new logic is supposed to work.
 2017-03-12 15:47:39 +10:00
Stuart Longland
a427edff38
setpoints: Rename constants for consistency 2017-03-12 15:47:22 +10:00
Stuart Longland
5c57cd27ae
setpoints: Cosmetics 2017-03-12 14:40:20 +10:00
Stuart Longland
29912e0c7c
board: Define timer configuration. 2017-03-12 14:38:18 +10:00
Stuart Longland
82eaf94aef
setpoints: Re-adjust setpoint definitions. 
- Define timeouts in milliseconds for portability
- Define voltages using symbols in design documentation
 2017-03-12 14:33:15 +10:00
Stuart Longland
39ef58f145
doc: Add re-design documentation. 
After some thought, the original code isn't going to do what is needed.
The following image is a re-design of the firmware having re-assessed
the requirements.
 2017-03-11 23:29:57 +10:00
Stuart Longland
301c9a9d43
Lengthen some timeouts. 
We seem to be a bit too impatient waiting for the mains charger to kick
in, and too hasty for the fan.
 2016-11-05 17:04:45 +10:00
Stuart Longland
d29d15308b
Add shutdown delay on "high" threshold. 
We should delay our shutdown in case the charger decides to ramp down
itself.  Otherwise we can get the situation where a smart charger starts
high, tripping the high threshold immediately, leading to the controller
and charger oscillating between on and off.
 2016-11-05 17:04:05 +10:00
Stuart Longland
d91ec8d786
Move setpoint definitions to separate header. 
This will get copied over to setpoints.h, where the developer can
customise them.  If they do so, and I have to change things, the
Makefile will warn them of this.
 2016-09-04 06:57:36 +10:00
Stuart Longland
772d5b9d30
FAN control: Fine-tune minimum PWM 
It appears the minimum PWM is more strongly dependent on battery voltage
than I had planned, it needs to be just a little higher to ensure the
fan keeps turning at low RPM.
 2016-09-04 06:47:28 +10:00
Stuart Longland
e62cbf497a
fan PWM tweaks. 
- Adjust the calculations so that we base our initial PWM at 0 then
  clamp to minimum PWM
- Implement a fan kick-start mode
- Start with fan off so kick-start mode works
 2016-09-04 06:30:52 +10:00
Stuart Longland
882541392f
Initial check-in 2016-09-03 17:31:15 +10:00