#ifndef BATTERY_H
#define BATTERY_H

/*
 * battery.h — Vbat ADC reading for CRSF telemetry (Issue #103)
 *
 * Hardware: ADC3 channel IN11 on PC1 (ADC_BATT 1, Mamba F722).
 * Voltage divider: 10 kΩ / 1 kΩ → 11:1 ratio.
 * Resolution: 12-bit (0–4095), Vref = 3.3 V.
 *
 * Filtered output in millivolts.  Reading is averaged over
 * BATTERY_SAMPLES conversions (software oversampling) to reduce noise.
 */

#include <stdint.h>

/* Initialise ADC3 for single-channel Vbat reading on PC1. */
void battery_init(void);

/*
 * battery_read_mv() — blocking single-shot read; returns Vbat in mV.
 * Takes ~1 µs (12-bit conversion at 36 MHz APB2 / 8 prescaler = 4.5 MHz ADC clk).
 * Returns 0 if ADC not initialised or conversion times out.
 */
uint32_t battery_read_mv(void);

/*
 * battery_estimate_pct() — coarse SoC estimate from Vbat (mV).
 * Works for 3S LiPo (10.5–12.6 V) and 4S (14.0–16.8 V).
 * Detection is automatic based on voltage.
 * Returns 0–100, or 255 if voltage is out of range.
 */
uint8_t battery_estimate_pct(uint32_t voltage_mv);

/*
 * battery_accumulate_coulombs() — periodically integrate battery current.
 * Call every 10-20 ms (50-100 Hz) from main loop to accumulate coulombs.
 * Reads motor currents from INA219 sensors.
 */
void battery_accumulate_coulombs(void);

/*
 * battery_get_soc_coulomb() — get coulomb-based SoC estimate.
 * Returns 0–100 (percent), or 255 if coulomb counter not yet valid.
 * Preferred over voltage-based when valid.
 */
uint8_t battery_get_soc_coulomb(void);

#endif /* BATTERY_H */