light sensor: run on startup of card10

Documentation/pycardium/light-sensor.rst

@@ -8,8 +8,8 @@ be fairly stable.
 
 .. py:function:: light_sensor.start()
 
-   Turn on the ADC and start reading brightness values.  This function must be
-   called before any measurements can be taken.
+   Turn on the ADC and start reading brightness values.  (In past this function must be
+   called before any measurements can be taken.)
 
 .. py:function:: light_sensor.get_reading()
 

epicardium/ble/card10.c

@@ -233,9 +233,7 @@ static uint8_t readCard10CB(
 
 	switch (handle) {
 	case CARD10_LIGHT_SENSOR_VAL_HDL:
-		epic_light_sensor_run();
 		epic_light_sensor_get(&ui16);
-		// epic_light_sensor_stop(); stop it everywhere, also in py
 		*pAttr->pValue = ui16;
 		APP_TRACE_INFO1("ble-card10: read lightsensor: %d\n", ui16);
 		return ATT_SUCCESS;

epicardium/main.c

@@ -126,6 +126,10 @@ int main(void)
 	LOG_INFO("startup", "Initializing dispatcher ...");
 	api_dispatcher_init();
 
+	/* light sensor */
+	LOG_INFO("startup", "starting light sensor ...");
+	epic_light_sensor_run();
+
 	/*
 	 * See if there's a l0dable.elf to run. If not, run pycardium.
 	 * This is temporary until epicardium gets a l0dable API from pycardium.