[FL-2198], [FL-2161] NFC emulation refactoring (#968)

* rfal: add state changed callback
* furi_hal_nfc: add NFC-A emulation API
* nfc: add emulation logger, refactor scenes
* elements: fix text_box element
* gui: fix text box module
* nfc: remove unnecessary buffers
* nfc: introduce emulation callback concept
* nfc: format sources
* bt settings: fix incorrect scene switch
* bt settings: format sources
* Debug: fix x2d import for python 3
* Gui: rename method name widget_clear to widget_reset
* nfc: add nfca emulation handler
* nfc: add global custom events enum
* nfc: UID emulation Data -> Log
* furi_hal_nfc: fix incorrect timings
* u2f, badusb: widget_clear() -> widget_reset()

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

lib/ST25RFAL002/include/rfal_rf.h

@@ -545,10 +545,13 @@ typedef struct {
 typedef void (*rfalUpperLayerCallback)(void);
 
 /*! Callback to be executed before a Transceive                              */
-typedef void (*rfalPreTxRxCallback)(void);
+typedef void (*rfalPreTxRxCallback)(void* context);
 
 /*! Callback to be executed after a Transceive                               */
-typedef void (*rfalPostTxRxCallback)(void);
+typedef void (*rfalPostTxRxCallback)(void* context);
+
+/** Callback to be executed on each RFAL state change */
+typedef void (*RfalStateChangedCallback)(void* context);
 
 /*******************************************************************************/
 /*  ISO14443A                                                                  */
@@ -819,6 +822,19 @@ void rfalSetPreTxRxCallback(rfalPreTxRxCallback pFunc);
  */
 void rfalSetPostTxRxCallback(rfalPostTxRxCallback pFunc);
 
+/** Set RFAL state changed callback
+ *
+ * @param cb    RfalStateChangedCallback instance
+ * @param ctx   pointer to context
+ */
+void rfal_set_state_changed_callback(RfalStateChangedCallback callback);
+
+/** Set callback context
+ *
+ * @param ctx pointer to context
+ */
+void rfal_set_callback_context(void* context);
+
 /*! 
  *****************************************************************************
  * \brief  RFAL Deinitialize
@@ -1480,6 +1496,15 @@ ReturnCode rfalTransceiveBlockingTxRx(
     uint32_t flags,
     uint32_t fwt);
 
+ReturnCode rfalTransceiveBitsBlockingTx(
+    uint8_t* txBuf,
+    uint16_t txBufLen,
+    uint8_t* rxBuf,
+    uint16_t rxBufLen,
+    uint16_t* actLen,
+    uint32_t flags,
+    uint32_t fwt);
+
 /*****************************************************************************
  *  Listen Mode                                                              *  
  *****************************************************************************/

lib/ST25RFAL002/source/st25r3916/rfal_rfst25r3916.c

@@ -130,6 +130,8 @@ typedef struct {
 typedef struct {
     rfalPreTxRxCallback preTxRx; /*!< RFAL's Pre TxRx callback  */
     rfalPostTxRxCallback postTxRx; /*!< RFAL's Post TxRx callback */
+    RfalStateChangedCallback state_changed_cb;
+    void* ctx;
 } rfalCallbacks;
 
 /*! Struct that holds counters to control the FIFO on Tx and Rx                                                                          */
@@ -595,6 +597,8 @@ ReturnCode rfalInitialize(void) {
 
     gRFAL.callbacks.preTxRx = NULL;
     gRFAL.callbacks.postTxRx = NULL;
+    gRFAL.callbacks.state_changed_cb = NULL;
+    gRFAL.callbacks.ctx = NULL;
 
 #if RFAL_FEATURE_NFCV
     /* Initialize NFC-V Data */
@@ -669,6 +673,14 @@ void rfalSetPostTxRxCallback(rfalPostTxRxCallback pFunc) {
     gRFAL.callbacks.postTxRx = pFunc;
 }
 
+void rfal_set_state_changed_callback(RfalStateChangedCallback callback) {
+    gRFAL.callbacks.state_changed_cb = callback;
+}
+
+void rfal_set_callback_context(void* context) {
+    gRFAL.callbacks.ctx = context;
+}
+
 /*******************************************************************************/
 ReturnCode rfalDeinitialize(void) {
     /* Deinitialize chip */
@@ -1520,6 +1532,30 @@ ReturnCode rfalTransceiveBlockingTx(
     return rfalTransceiveRunBlockingTx();
 }
 
+ReturnCode rfalTransceiveBitsBlockingTx(
+    uint8_t* txBuf,
+    uint16_t txBufLen,
+    uint8_t* rxBuf,
+    uint16_t rxBufLen,
+    uint16_t* actLen,
+    uint32_t flags,
+    uint32_t fwt) {
+    ReturnCode ret;
+    rfalTransceiveContext ctx = {
+        .rxBuf = rxBuf,
+        .rxBufLen = rxBufLen,
+        .rxRcvdLen = actLen,
+        .txBuf = txBuf,
+        .txBufLen = txBufLen,
+        .flags = flags,
+        .fwt = fwt,
+    };
+
+    EXIT_ON_ERR(ret, rfalStartTransceive(&ctx));
+
+    return rfalTransceiveRunBlockingTx();
+}
+
 /*******************************************************************************/
 static ReturnCode rfalTransceiveRunBlockingTx(void) {
     ReturnCode ret;
@@ -1797,7 +1833,7 @@ static void rfalCleanupTransceive(void) {
     /* Execute Post Transceive Callback                                            */
     /*******************************************************************************/
     if(gRFAL.callbacks.postTxRx != NULL) {
-        gRFAL.callbacks.postTxRx();
+        gRFAL.callbacks.postTxRx(gRFAL.callbacks.ctx);
     }
     /*******************************************************************************/
 }
@@ -1838,7 +1874,7 @@ static void rfalPrepareTransceive(void) {
     /* Execute Pre Transceive Callback                                             */
     /*******************************************************************************/
     if(gRFAL.callbacks.preTxRx != NULL) {
-        gRFAL.callbacks.preTxRx();
+        gRFAL.callbacks.preTxRx(gRFAL.callbacks.ctx);
     }
     /*******************************************************************************/
 
@@ -4164,6 +4200,11 @@ ReturnCode rfalListenSetState(rfalLmState newSt) {
 
     gRFAL.Lm.state = newState;
 
+    // Call callback on state change
+    if(gRFAL.callbacks.state_changed_cb) {
+        gRFAL.callbacks.state_changed_cb(gRFAL.callbacks.ctx);
+    }
+
     return ret;
 }