fix: improve timeout prompt randomization

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

@@ -21,6 +21,7 @@
 #include "ql_ping.h"
 #include "ql_nw.h"
 #include "ql_atcmd.h"
+#include "ql_platform.h"
 #include "layer3.h"
 #include "ql_uart.h"
 #include "hal_api.h"
@@ -195,7 +196,10 @@ static void remove_underscores(char *str) {
  */
 static int randomize_tts_error_url(char *url, size_t url_size)
 {
+    static uint32_t random_sequence = 0;
+    static unsigned int last_random_index = 10;
     char *file_name;
+    uint32_t random_value;
     unsigned int random_index;
     int written;
 
@@ -211,7 +215,21 @@ static int randomize_tts_error_url(char *url, size_t url_size)
         return 0;
     }
 
-    random_index = hal_os_get_rand() % 10;
+    /*
+     * 某些设备上硬件随机接口可能持续返回 0，因此混合伪随机数、系统 tick
+     * 和递增序列；若仍与上一次相同，则向后偏移，避免连续重复播放。
+     */
+    random_sequence++;
+    random_value = hal_os_get_rand();
+    random_value ^= ql_pseudo_random_number();
+    random_value ^= ql_rtos_get_systicks();
+    random_value ^= random_sequence * 0x9E3779B9U;
+    random_index = random_value % 10;
+    if(random_index == last_random_index){
+        random_index = (random_index + 1 + (random_sequence % 9)) % 10;
+    }
+    last_random_index = random_index;
+
     written = snprintf(url, url_size, CLOUD_TTS_ERROR_URL_FORMAT, random_index);
     if(written < 0 || (size_t)written >= url_size){
         printf("random tts error url buffer too small\n");