add rng driver

Author: w200024212

src/fw/drivers/sf32lb/rng.c

@@ -0,0 +1,54 @@
+#include "drivers/rng.h"
+
+#include "drivers/periph_config.h"
+#include "system/passert.h"
+#include "kernel/util/sleep.h"
+#include "board/board_sf32lb.h"
+
+#include <mcu.h>
+
+bool flag_inited = false;
+RNG_HandleTypeDef   RngHandle;
+
+bool rng_rand(uint32_t *rand_out) {
+
+  PBL_ASSERTN(rand_out);
+  HAL_StatusTypeDef   status;
+  uint32_t            seed;
+
+  /*##-1- Initialize RNG peripheral #######################################*/
+  if(!flag_inited)
+  {
+      RngHandle.Instance = hwp_trng;
+      status = HAL_RNG_Init(&RngHandle);
+      if ( status != HAL_OK)
+      {
+          /* Initialization Error */
+          //PBL_LOG(LOG_LEVEL_ERROR,"rng_rand init fail!");
+          return false;
+      }
+      //PBL_LOG(LOG_LEVEL_INFO,"rng_rand first init ok!");
+      flag_inited = true;
+  }
+
+  
+  /*##-2- Generate random ###################################*/
+  seed = 0;
+  status = HAL_RNG_Generate(&RngHandle, &seed, 1);
+  //PBL_LOG(LOG_LEVEL_INFO,"Generate Random value=%x, status=%d", (unsigned int)seed, (int)status);
+  PBL_ASSERTN(seed != 0);
+  *rand_out = seed;
+
+  return true;
+}
+void example_rng(void)
+{
+  uint8_t i = 0;
+  uint32_t value;
+  for(i = 0; i < 8; i++)
+  {
+    rng_rand(&value);
+    PBL_LOG(LOG_LEVEL_INFO,"get random value 0x%x;", (unsigned int)value);
+  }
+
+}

src/fw/drivers/wscript_build

@@ -1662,7 +1662,8 @@ if mcu_family == 'SF32LB':
         name='driver_sf32lb',
         source=[
             'sf32lb/stubs/rtc.c',
-            'sf32lb/stubs/rng.c',
+            #'sf32lb/stubs/rng.c',
+            'sf32lb/rng.c',
             'flash/flash_api.c',
             'flash/flash_crc.c',
             'flash/flash_erase.c',