Support legacy boards without GNSS

ql-application/threadx/interface/custom_app/gnss.c

@@ -15,6 +15,7 @@
 #include "sockets.h"
 #include "netdb.h"
 #include "app_inc.h"
+#include "../../../../ql-config/config/board_features.h"
 
 // 新增宏定义（原代码中未定义）
 #define GNSS_FAST_MODE_HOLD_TIME    (5 * 60 * 1000)   // FAST模式持续5分钟后切SLOW
@@ -320,9 +321,14 @@ void quec_gnss_callback(char *data, int len)
  *===========================================================================*/
 void set_gnss_mode(gnss_mode_t mode)
 {
+#if !NFC_GNSS_BOARD_HAS_GNSS
+    (void)mode;
+    return; /* No GNSS task exists to leave FAST mode and allow sleep. */
+#else
     g_gnss_mode = mode;
     printf("[GNSSMode] Set to %s Mode\n", 
            (mode == GNSS_MODE_FAST) ? "Fast (30s)" : "Slow (5min)");
+#endif
 }
 
 gnss_mode_t get_gnss_mode(void)
@@ -531,6 +537,11 @@ static void quec_gnss_test(void * argv)
 
 void app_gnss_init(void)
 {
+#if !NFC_GNSS_BOARD_HAS_GNSS
+    printf("[GNSS] Legacy board: positioning disabled\n");
+    return;
+#else
     ql_task_t gnssTaskRef = NULL;
     ql_rtos_task_create(&gnssTaskRef, 1024*4, 100, "gnss_Task_Ref", quec_gnss_test, NULL);
+#endif
 }