Added a function to generate a random 6 digit number, this number could be used as the bluetooth pairing code

src/W800_SDK_v1.00.10/app/app_utils/app_utils.c

@@ -1,5 +1,6 @@
 #include "app_utils.h"
 #include "app_log.h"
+#include "wm_crypto_hard.h""
 
 static uint32_t _elapsed_ms = 0;
 
@@ -70,3 +71,22 @@ uint32_t elapsed_ms(void)
 {
     return _elapsed_ms;
 }
+
+uint32_t random_gen_6_digit(void)
+{
+	unsigned char random_buf[6] = {0};
+	uint32_t output_num = 0;
+
+	tls_crypto_random_init(0x19031998, CRYPTO_RNG_SWITCH_16);
+	tls_crypto_random_bytes(random_buf, sizeof random_buf);
+	tls_crypto_random_stop();
+
+	for(uint8_t i = 0; i < sizeof random_buf; i++)
+	{
+		// Ensures the last digit is not 0
+		if(i == (sizeof random_buf) - 1 && random_buf[i] % 10 == 0)random_buf[i]++;
+		output_num += (random_buf[i] % 10) * pow(10, i);
+	}
+
+	return output_num;
+}

src/W800_SDK_v1.00.10/app/app_utils/app_utils.h

@@ -31,4 +31,11 @@ void ms_increment(uint32_t increment);
  */
 uint32_t elapsed_ms(void);
 
+/**
+ * @brief Generates a 6 digit random number using the hardware RNG IP.
+ * 
+ * @return uint32_t the 6 digit random number generated
+ */
+uint32_t random_gen_6_digit(void);
+
 #endif //APP_UTILS_H