Correct bug with ADC not measuring when only one NXT sensor connected

micropython/modules/nxt_sensors/analog_sensor.c

@@ -43,7 +43,7 @@ typedef struct {
     uint32_t cycle_period;
 } analog_sensors;
 
-static analog_sensors sensors;
+static analog_sensors sensors = {.enabled = false};
 
 static bool opencube_analog_sensor_continuous(repeating_timer_t *timer);
 
@@ -53,6 +53,7 @@ void opencube_analog_sensors_init(void) {
     }
     for (int i = 0; i < NUM_SENSOR_PORTS; i++)
     {
+        sensors.ports[i].enabled = false;
         switch (i)
         {
         case OPENCUBE_SENSOR_1:
@@ -85,6 +86,7 @@ void opencube_analog_sensors_init(void) {
     ADS1119_set_data_rate(sensors.adc, 3);
     ADS1119_write_config(sensors.adc);
     opencube_unlock_i2c();
+    sensors.current_port = 255;
     sensors.enabled = true;
 }
 
@@ -119,7 +121,13 @@ void opencube_analog_sensor_deinit(uint8_t port) {
     sensors.ports[port].enabled = false;
     opencube_analog_sensor_turn_off(port);
     opencube_analog_sensor_set_switching(port, false);
-    opencube_analog_sensor_stop_continuous();
+    for (int i = 0; i < NUM_SENSOR_PORTS; i++)
+    {
+        if (sensors.ports[i].enabled) {
+            return;
+        }
+    }
+    sensors.current_port = 255;
 }
 
 void opencube_analog_sensor_turn_on(uint8_t port) {
@@ -189,10 +197,8 @@ uint16_t opencube_analog_sensor_get_value(uint8_t port, bool pin_on) {
     if (sensors.ports[port].enabled) {
         // if not continuous get a measurement first
         if (!sensors.continuous) {   
-            if (sensors.current_port != port) {
-                // blocking read
-                opencube_analog_sensor_read_value(port);
-            }
+            // blocking read
+            opencube_analog_sensor_read_value(port);
         }
 
         // if switching mode is on it does not matter which value is returned