v2_battery_test

V2 Battery ADC Statistics Test

Purpose

This focused example validates the V2 battery measurement path: BATTERY_MEASUREMENT_CONTROL=P0.17 and BATTERY_ADC_DATA=P0.05. The control net drives the battery-divider switch. Each LOW/HIGH state is sampled 16 times using the 3.0 V internal reference, 12-bit ADC, and 2.0 divider ratio.

Serial test

Open a serial monitor at 115200, flash and reset v2_battery_test, and watch the 16-sample statistics for both control states. Measure the battery terminal voltage with a multimeter at the same time.

Expected behavior

• Startup reports the ADC reference, resolution, and V2 pin map.
• Every three seconds the example alternates the divider control state and prints minimum, maximum, and average ADC values.
• The ADC is not permanently 0 or 4095, and repeated samples in one state are reasonably close.
• The calculated battery voltage is consistent with the multimeter reading within divider and ADC tolerances.

Failure diagnosis

• The control read-back does not change with LOW/HIGH: inspect the P0.17 routing and the Q4 divider-switch circuit.
• Both control states produce identical ADC values: inspect the switching transistor, divider resistors, and P0.05 network.
• Saturated or unstable ADC values: check the battery voltage range, reference configuration, ground, and wiring.

Notes

P0.24 is the V2 GPS_EN control net. It is not used by this example and must not be treated as a BOOT or independent PPS input.