app: src: modules: power: update nrf_fuel_gauge_process usage

Update calls to `nrf_fuel_gauge_process` to match its new API.

Also increase the fuel gauge state buffer size to 512 bytes and update
the constant `nrf_fuel_gauge_state_size` in tests accordingly.

Signed-off-by: Simen S. Røstad <simen.rostad@nordicsemi.no>

Author: simensrostad

app/src/modules/power/fuel_gauge_state.c

@@ -14,11 +14,12 @@
 LOG_MODULE_DECLARE(power, CONFIG_APP_POWER_LOG_LEVEL);
 
 #define FUEL_GAUGE_MAGIC 0x4647534F /* "FGSO" - Fuel Gauge State OK */
+#define FUEL_GAUGE_STATE_BUF_SIZE 512
 
 struct fuel_gauge_state {
 	uint32_t magic;     /* Magic number to identify valid state */
 	uint32_t size;      /* Size of state data */
-	uint8_t state[256]; /* Fuel gauge state buffer */
+	uint8_t state[FUEL_GAUGE_STATE_BUF_SIZE];
 };
 
 /* Place the fuel gauge state in the noinit RAM section.

app/src/modules/power/power.c

@@ -424,9 +424,14 @@ static int sample_and_process(struct power_state_object *state_object)
 
 	delta = (float)k_uptime_delta(&state_object->fuel_gauge_ref_time) / 1000.0f;
 
-	state_object->percentage =
-		nrf_fuel_gauge_process(state_object->voltage, state_object->current,
-				       state_object->temperature, delta, NULL);
+	err = nrf_fuel_gauge_process(state_object->voltage,
+				     state_object->current,
+				     state_object->temperature, delta,
+				     &state_object->percentage, NULL);
+	if (err) {
+		LOG_ERR("nrf_fuel_gauge_process, error: %d", err);
+		return err;
+	}
 
 #endif /* CONFIG_MEMFAULT_NRF_PLATFORM_BATTERY_NPM13XX */
 
@@ -667,8 +672,18 @@ static void power_module_thread(void)
 	power_state.voltage = parameters.v0;
 	power_state.current = parameters.i0;
 	power_state.temperature = parameters.t0;
-	power_state.percentage =
-		nrf_fuel_gauge_process(parameters.v0, parameters.i0, parameters.t0, 0.0f, NULL);
+
+	err = nrf_fuel_gauge_process(parameters.v0,
+				     parameters.i0,
+				     parameters.t0,
+				     0.0f,
+				     &power_state.percentage,
+				     NULL);
+	if (err) {
+		LOG_ERR("nrf_fuel_gauge_process, error: %d", err);
+		SEND_FATAL_ERROR();
+		return;
+	}
 
 	/* Set charge current limit and termination current for accurate TTF prediction */
 	struct sensor_value desired_charge_current;

tests/module/power/src/power_module_test.c

@@ -21,7 +21,7 @@ DEFINE_FFF_GLOBALS;
 
 FAKE_VALUE_FUNC(int, task_wdt_feed, int);
 FAKE_VALUE_FUNC(int, task_wdt_add, uint32_t, task_wdt_callback_t, void *);
-FAKE_VALUE_FUNC(float, nrf_fuel_gauge_process, float, float, float, float,
+FAKE_VALUE_FUNC(int, nrf_fuel_gauge_process, float, float, float, float, float *,
 		struct nrf_fuel_gauge_state_info *);
 FAKE_VALUE_FUNC(int, nrf_fuel_gauge_init, const struct nrf_fuel_gauge_init_parameters *, float *);
 FAKE_VALUE_FUNC(int, date_time_now, int64_t *);
@@ -33,7 +33,7 @@ FAKE_VOID_FUNC(nrf_fuel_gauge_idle_set, float, float, float);
 FAKE_VOID_FUNC(lte_lc_register_handler, lte_lc_evt_handler_t);
 
 /* Define nrf_fuel_gauge_state_size for tests (normally provided by the library) */
-const size_t nrf_fuel_gauge_state_size = 128;
+const size_t nrf_fuel_gauge_state_size = 512;
 
 ZBUS_MSG_SUBSCRIBER_DEFINE(power_subscriber);
 ZBUS_CHAN_ADD_OBS(power_chan, power_subscriber, 0);