4.8 Demo Meter Firmware Application

The Meter Firmware manages the following modules or interfaces:

Firmware power-up sequence management
Metrology library binary load in Core 1
Metrology Initialization
Meter configuration and status:
- Constants: IA gain, IB gain, IC gain, IN gain, Channels enable/disable, Voltage Max, Currents(A, N) Max, Voltage Scaling, Current Scaling, Volt, Freq, Accumulation, Starting current, Sag threshold, Sag Counts, Rogowski integrator, harmonic enable/disable, DSP data monitor setup
- Calibration for amplitude and phase of voltages and currents
Timer services
Metrology Interface
LCD display
User communication (terminal interface)
External Non-Volatile Memory management

Warning: The provided source code example shows how to read and store several metrology parameters in the external non-volatile memories populating the evaluation boards. The customer must decide what are the parameters to be saved as well as when and how often the memory is written. Additionally, it is recommended that the customers decide the saving strategy best fitting their application, taking into account the endurance of the selected external memory. For example, the application could save periodically or when the value to be saved increments above a threshold or when a power outage is detected. Some applications use wear-leveling strategies in case the external memory endurance could be reached before the expected life of the design.