[FL-3762] Configurable Infrared TX output (#3484)

* Implement Gui for the feature
* Implement furi_hal side
* Implement IR module detection
* Fix PVS warnings
* Add comments

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

targets/furi_hal_include/furi_hal_infrared.h

@@ -16,6 +16,12 @@ extern "C" {
 #define INFRARED_MAX_FREQUENCY 56000
 #define INFRARED_MIN_FREQUENCY 10000
 
+typedef enum {
+    FuriHalInfraredTxPinInternal,
+    FuriHalInfraredTxPinExtPA7,
+    FuriHalInfraredTxPinMax,
+} FuriHalInfraredTxPin;
+
 typedef enum {
     FuriHalInfraredTxGetDataStateOk, /**< New data obtained */
     FuriHalInfraredTxGetDataStateDone, /**< New data obtained, and this is end of package */
@@ -143,6 +149,29 @@ void furi_hal_infrared_async_tx_set_signal_sent_isr_callback(
     FuriHalInfraredTxSignalSentISRCallback callback,
     void* context);
 
+/** Detect which pin has an external IR module connected.
+ *
+ * External IR modules are detected by enabling a weak pull-up
+ * on supported pins and testing whether the input is still low.
+ *
+ * This method works best on modules that employ a FET with a
+ * strong pull-down or a BJT for driving IR LEDs.
+ *
+ * The module MUST pull the input voltage down to at least 0.9V
+ * or lower in order for it to be detected.
+ *
+ * If no module has been detected, FuriHalInfraredTxPinInternal is returned.
+ *
+ * @return numeric identifier of the first pin with a module detected.
+ */
+FuriHalInfraredTxPin furi_hal_infrared_detect_tx_output(void);
+
+/** Set which pin will be used to transmit infrared signals.
+ *
+ * @param[in]   tx_pin  pin to be used for signal transmission.
+ */
+void furi_hal_infrared_set_tx_output(FuriHalInfraredTxPin tx_pin);
+
 #ifdef __cplusplus
 }
 #endif