int32_t i2c_read(uint8_t address, uint8_t reg, uint8_t *buffer, uint16_t size);
int32_t i2c_write(uint8_t address, uint8_t reg, const uint8_t *buffer, uint16_t size);

#include "axp192.h"
#include "your-i2c-hal.h"

float vacin, iacin, vvbus, ivbus, temp, pbat, vbat, icharge, idischarge, vaps, cbat;
uint8_t power, charge;
axp192_t axp;

/* Add pointers to HAL functions. */
axp.read = &i2c_read;
axp.write = &i2c_write;

axp192_init(&axp);

axp192_read(&axp, AXP192_ACIN_VOLTAGE, &vacin);
axp192_read(&axp, AXP192_ACIN_CURRENT, &iacin);
axp192_read(&axp, AXP192_VBUS_VOLTAGE, &vvbus);
axp192_read(&axp, AXP192_VBUS_CURRENT, &ivbus);
axp192_read(&axp, AXP192_TEMP, &temp);
axp192_read(&axp, AXP192_TS_INPUT, &vts);
axp192_read(&axp, AXP192_BATTERY_POWER, &pbat);
axp192_read(&axp, AXP192_BATTERY_VOLTAGE, &vbat);
axp192_read(&axp, AXP192_CHARGE_CURRENT, &icharge);
axp192_read(&axp, AXP192_DISCHARGE_CURRENT, &idischarge);
axp192_read(&axp, AXP192_APS_VOLTAGE, &vaps);

printf(
    "vacin: %.2fV iacin: %.2fA vvbus: %.2fV ivbus: %.2fA vts: %.2fV temp: %.0fC "
    "pbat: %.2fmW vbat: %.2fV icharge: %.2fA idischarge: %.2fA, vaps: %.2fV",
    vacin, iacin, vvbus, ivbus, vts, temp, pbat, vbat, icharge, idischarge, vaps
);

axp192_ioctl(&axp, AXP192_READ_POWER_STATUS, &power);
axp192_ioctl(&axp, AXP192_READ_CHARGE_STATUS, &charge);

printf("power: 0x%02x charge: 0x%02x", power, charge);

axp192_ioctl(&axp, AXP192_COULOMB_COUNTER_ENABLE, NULL);
axp192_read(&axp, AXP192_COULOMB_COUNTER, &cbat);

printf("cbat: %.2fmAh", cbat);