July
2005, Issue 180
Solar-Powered
Water Pump Controller
Cypress
PSoC High Integration Challenge 2004 Contest Winner
SOFTWARE
Figure
6 depicts the pump inverter’s main software components.
I implemented the system with a combination of foreground
interrupts for handling time critical events and a series
of background algorithms for processing the less-critical
activities during the remaining time.
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(Click
here to enlarge)
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Figure
6—The software block diagram shows the lower-level
ISRs followed by the ADC sampler and periodic task
scheduler, which schedules the remaining system
activities. |
The
background processing involves a polling algorithm for
collecting the ADC measurements and a non-preemptive
task scheduler, which triggers at the waveform generator’s
voltage zero crossing. The task scheduler operates the
control loops, fault monitoring, and user interface
activities.
