unleashed-firmware/applications/debug/unit_tests/power/power_test.c

#include <furi.h>
#include <furi_hal.h>
#include "../minunit.h"

static void power_test_deinit(void) {
    // Try to reset to default charge voltage limit
    furi_hal_power_set_battery_charge_voltage_limit(4.208f);
}

MU_TEST(test_power_charge_voltage_limit_exact) {
    // Power of 16mV charge voltage limits get applied exactly
    // (bq25896 charge controller works in 16mV increments)
    //
    // This test may need adapted if other charge controllers are used in the future.
    for(uint16_t charge_mv = 3840; charge_mv <= 4208; charge_mv += 16) {
        float charge_volt = (float)charge_mv / 1000.0f;
        furi_hal_power_set_battery_charge_voltage_limit(charge_volt);
        mu_assert_double_eq(charge_volt, furi_hal_power_get_battery_charge_voltage_limit());
    }
}

MU_TEST(test_power_charge_voltage_limit_floating_imprecision) {
    // 4.016f should act as 4.016 V, even with floating point imprecision
    furi_hal_power_set_battery_charge_voltage_limit(4.016f);
    mu_assert_double_eq(4.016f, furi_hal_power_get_battery_charge_voltage_limit());
}

MU_TEST(test_power_charge_voltage_limit_inexact) {
    // Charge voltage limits that are not power of 16mV get truncated down
    furi_hal_power_set_battery_charge_voltage_limit(3.841f);
    mu_assert_double_eq(3.840, furi_hal_power_get_battery_charge_voltage_limit());

    furi_hal_power_set_battery_charge_voltage_limit(3.900f);
    mu_assert_double_eq(3.888, furi_hal_power_get_battery_charge_voltage_limit());

    furi_hal_power_set_battery_charge_voltage_limit(4.200f);
    mu_assert_double_eq(4.192, furi_hal_power_get_battery_charge_voltage_limit());
}

MU_TEST(test_power_charge_voltage_limit_invalid_clamped) {
    // Out-of-range charge voltage limits get clamped to 3.840 V and 4.208 V
    furi_hal_power_set_battery_charge_voltage_limit(3.808f);
    mu_assert_double_eq(3.840, furi_hal_power_get_battery_charge_voltage_limit());
    furi_hal_power_set_battery_charge_voltage_limit(1.0f);
    mu_assert_double_eq(3.840, furi_hal_power_get_battery_charge_voltage_limit());

    // NOTE: Intentionally picking a small increment above 4.208 V to reduce the risk of an
    // unhappy battery if this fails.
    furi_hal_power_set_battery_charge_voltage_limit(4.240f);
    mu_assert_double_eq(4.208, furi_hal_power_get_battery_charge_voltage_limit());
    // Likewise, picking a number that the uint8_t wraparound in the driver would result in a
    // VREG value under 23 if this test fails.
    // E.g. (uint8_t)((8105-3840)/16) -> 10
    furi_hal_power_set_battery_charge_voltage_limit(8.105f);
    mu_assert_double_eq(4.208, furi_hal_power_get_battery_charge_voltage_limit());
}

MU_TEST_SUITE(test_power_suite) {
    MU_RUN_TEST(test_power_charge_voltage_limit_exact);
    MU_RUN_TEST(test_power_charge_voltage_limit_floating_imprecision);
    MU_RUN_TEST(test_power_charge_voltage_limit_inexact);
    MU_RUN_TEST(test_power_charge_voltage_limit_invalid_clamped);
    power_test_deinit();
}

int run_minunit_test_power() {
    MU_RUN_SUITE(test_power_suite);
    return MU_EXIT_CODE;
}