Add setter functions in ux_sync lib for synchronous call return code …

…and "end of flow" variables.

lib_ux_sync/include/ux_sync.h

@@ -10,6 +10,10 @@ typedef enum {
     UX_SYNC_RET_ERROR
 } ux_sync_ret_t;
 
+void ux_sync_setReturnCode(ux_sync_ret_t ret);
+
+void ux_sync_setEnded(bool ended);
+
 ux_sync_ret_t ux_sync_homeAndSettings(const char                   *appName,
                                       const nbgl_icon_details_t    *appIcon,
                                       const char                   *tagline,

lib_ux_sync/src/ux_sync.c

@@ -49,6 +49,28 @@ static ux_sync_ret_t ux_sync_wait(bool exitOnApdu)
     return g_ret;
 }
 
+/**
+ * @brief Sets the return code of synchronous UX calls. Can be used by content action callbacks
+ * defined by application code.
+ *
+ * @param ret return code to set.
+ */
+void ux_sync_setReturnCode(ux_sync_ret_t ret)
+{
+    g_ret = ret;
+}
+
+/**
+ * @brief Sets the ended flag of synchronous UX calls. Can be used by content action callbacks
+ * defined by application code to end the UX flow.
+ *
+ * @param ended flag to set.
+ */
+void ux_sync_setEnded(bool ended)
+{
+    g_ended = ended;
+}
+
 /**
  * @brief Draws the extended version of home page of an app (page on which we land when launching it
  *        from dashboard) with automatic support of setting display.