Merge pull request #2611 from adustm/STM32_entropy

STM32 hw entropy

Author: sg-

targets/TARGET_STM/TARGET_STM32F4/trng_api.c

@@ -84,6 +84,10 @@ struct i2c_s {
     I2CName  i2c;
 };
 
+struct trng_s {
+    RNG_HandleTypeDef handle;
+};
+
 #include "common_objects.h"
 #include "gpio_object.h"
 

targets/TARGET_STM/TARGET_STM32L0/TARGET_DISCO_L053C8/objects.h

@@ -84,6 +84,10 @@ struct i2c_s {
     I2CName  i2c;
 };
 
+struct trng_s {
+    RNG_HandleTypeDef handle;
+};
+
 #include "common_objects.h"
 #include "gpio_object.h"
 

targets/TARGET_STM/TARGET_STM32L0/TARGET_NUCLEO_L073RZ/objects.h

@@ -90,6 +90,10 @@ struct can_s {
     int index;
 };
 
+struct trng_s {
+    RNG_HandleTypeDef handle;
+};
+
 #include "common_objects.h"
 #include "gpio_object.h"
 

targets/TARGET_STM/TARGET_STM32L4/TARGET_DISCO_L476VG/objects.h

@@ -90,6 +90,10 @@ struct can_s {
     int index;
 };
 
+struct trng_s {
+    RNG_HandleTypeDef handle;
+};
+
 #include "gpio_object.h"
 #include "common_objects.h"
 

targets/TARGET_STM/TARGET_STM32L4/TARGET_NUCLEO_L432KC/objects.h

@@ -90,6 +90,10 @@ struct can_s {
     int index;
 };
 
+struct trng_s {
+    RNG_HandleTypeDef handle;
+};
+
 #include "common_objects.h"
 #include "gpio_object.h"
 

targets/TARGET_STM/TARGET_STM32L4/TARGET_NUCLEO_L476RG/objects.h

@@ -1,5 +1,5 @@
 /*
- *  Hardware entropy collector for the STM32F7 family
+ *  Hardware entropy collector for the STM32 families
  *
  *  Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
  *  SPDX-License-Identifier: Apache-2.0
@@ -26,6 +26,7 @@
 
 /** trng_get_byte
  *  @brief Get one byte of entropy from the RNG, assuming it is up and running.
+ *  @param obj TRNG obj
  *  @param pointer to the hardware generated random byte.
  */
 static void trng_get_byte(trng_t *obj, unsigned char *byte )
@@ -35,13 +36,25 @@ static void trng_get_byte(trng_t *obj, unsigned char *byte )
 
 void trng_init(trng_t *obj)
 {
+#if defined(TARGET_STM32L4)
+    RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
+
+    /*Select PLLQ output as RNG clock source */
+    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RNG;
+    PeriphClkInitStruct.RngClockSelection = RCC_RNGCLKSOURCE_PLL;
+    HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
+#endif
+
     /* RNG Peripheral clock enable */
     __HAL_RCC_RNG_CLK_ENABLE();
 
     /* Initialize RNG instance */
     obj->handle.Instance = RNG;
     HAL_RNG_Init(&obj->handle);
 
+    /* first random number generated after setting the RNGEN bit should not be used */
+    HAL_RNG_GetRandomNumber(&obj->handle);
+
 }
 
 void trng_free(trng_t *obj)

targets/TARGET_STM/TARGET_STM32F7/trng_api.c renamed to targets/TARGET_STM/trng_api.c

@@ -915,11 +915,11 @@
         "supported_form_factors": ["ARDUINO", "MORPHO"],
         "core": "Cortex-M0+",
         "default_toolchain": "ARM",
-        "extra_labels": ["STM", "STM32L0", "STM32L073RZ"],
+        "extra_labels": ["STM", "STM32L0", "STM32L073RZ", "STM32L073xx"],
         "supported_toolchains": ["ARM", "uARM", "GCC_ARM", "IAR"],
         "inherits": ["Target"],
         "detect_code": ["0760"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "I2C", "I2CSLAVE", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "I2C", "I2CSLAVE", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES", "TRNG"],
         "release_versions": ["2", "5"],
         "device_name": "STM32L073RZ"
     },
@@ -943,7 +943,7 @@
         "supported_toolchains": ["ARM", "uARM", "IAR", "GCC_ARM"],
         "inherits": ["Target"],
         "detect_code": ["0770"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "I2C", "I2CSLAVE", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "CAN", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "I2C", "I2CSLAVE", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "CAN", "STDIO_MESSAGES", "TRNG"],
         "release_versions": ["2", "5"],
         "device_name" : "STM32L432KC"
     },
@@ -955,7 +955,7 @@
         "supported_toolchains": ["ARM", "uARM", "IAR", "GCC_ARM"],
         "inherits": ["Target"],
         "detect_code": ["0765"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "I2C", "I2CSLAVE", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "I2C", "I2CSLAVE", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES", "TRNG"],
         "release_versions": ["2", "5"],
         "device_name": "stm32l476rg"
     },
@@ -1100,7 +1100,7 @@
         "extra_labels": ["STM", "STM32L4", "STM32L476VG"],
         "supported_toolchains": ["ARM", "uARM", "IAR", "GCC_ARM"],
         "detect_code": ["0820"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "I2C", "I2CSLAVE", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "CAN", "I2C", "I2CSLAVE", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES", "TRNG"],
         "release_versions": ["2", "5"],
         "device_name": "stm32l476vg"
     },