fix(light_sensor): Use work queue

epicardium/modules/light_sensor.c

@@ -38,17 +38,14 @@ uint16_t epic_light_sensor_read()
 	return last_value;
 }
 
-static void readAdcCallback()
+static void workpoll(void *data)
 {
-	if (hwlock_acquire_nonblock(HWLOCK_ADC) != 0) {
-		/* Can't do much about this here ... Retry next time */
-		return;
-	}
-
-	ADC_StartConvert(ADC_CH_7, 0, 0);
-	ADC_GetData(&last_value);
+	epic_light_sensor_read();
+}
 
-	hwlock_release(HWLOCK_ADC);
+static void poll(TimerHandle_t xTimer)
+{
+	workqueue_schedule(workpoll, NULL);
 }
 
 int epic_light_sensor_run()
@@ -65,7 +62,7 @@ int epic_light_sensor_run()
 			READ_FREQ,
 			pdTRUE,
 			NULL,
-			readAdcCallback,
+			poll,
 			&poll_timer_buffer
 		);
 		// since &poll_timer_buffer is not NULL, xTimerCreateStatic should allways succeed, so