added random number generator driver and stuff

source/firmware/arch/stm32f4xx/board/stm32f4-discovery/include/stm32f4-discovery.h

@@ -24,8 +24,35 @@
 
 #include "gpio.h"
 #include "stm32f4_gpio.h"
+
+#include "rng.h"
+#include "stm32f4_rng.h"
+
 #include "driver.h"
 
+// Random number generator
+static RNG_HandleTypeDef stm32f4_rng_handle = {
+		.Instance = RNG,
+};
+
+static struct stm32f4_rng stm32f4_rng = {
+		.rng_handle = &stm32f4_rng_handle,
+};
+
+static struct rng __rng = {
+		.arch_dep_device = &stm32f4_rng,
+		.fp = &rng_fp,
+};
+
+#ifdef TEST_APP
+static const struct driver rng = {
+#else
+const struct driver rng = {
+#endif
+		.driver_type = DRIVER_TYPE_RNG,
+		.device_driver = &__rng,
+};
+
 // GPIO_C0
 static const GPIO_InitTypeDef port_cfg_c0 = {
 		.Pin = GPIO_PIN_0,

source/firmware/arch/stm32f4xx/driver/include/stm32f4_rng.h

@@ -0,0 +1,25 @@
+/*
+ * stm32f4_rng.h
+ *
+ *  Created on: Aug 30, 2016
+ *      Author: tkl
+ */
+
+#ifndef SOURCE_FIRMWARE_ARCH_STM32F4XX_INCLUDE_STM32F4_RNG_H_
+#define SOURCE_FIRMWARE_ARCH_STM32F4XX_INCLUDE_STM32F4_RNG_H_
+
+struct stm32f4_rng {
+	RNG_HandleTypeDef *rng_handle;
+};
+
+int stm32f4_rng_open(const void *this);
+int stm32f4_rng_close(const void *this);
+unsigned int stm32f4_rng_read(const void *this);
+
+static const struct rng_fp rng_fp = {
+		.open = stm32f4_rng_open,
+		.close = stm32f4_rng_close,
+		.read = stm32f4_rng_read,
+};
+
+#endif /* SOURCE_FIRMWARE_ARCH_STM32F4XX_INCLUDE_STM32F4_RNG_H_ */

source/firmware/arch/stm32f4xx/driver/stm32f4_rng.c

@@ -0,0 +1,43 @@
+/*
+ * stm32f4_rng.c
+ *
+ *  Created on: Aug 30, 2016
+ *      Author: tkl
+ */
+
+#include <stddef.h>
+
+#include "board.h"
+
+int stm32f4_rng_open(const void *this)
+{
+	if(NULL == this)
+		return -1;
+	struct stm32f4_rng *dev = (struct stm32f4_rng *)this;
+
+	__HAL_RCC_RNG_CLK_ENABLE();
+	HAL_RNG_DeInit(dev->rng_handle);
+	HAL_RNG_Init(dev->rng_handle);
+
+	return 0;
+}
+
+int stm32f4_rng_close(const void *this)
+{
+	if(NULL == this)
+		return -1;
+	struct stm32f4_rng *dev = (struct stm32f4_rng *)this;
+	__HAL_RCC_RNG_CLK_DISABLE();
+	HAL_RNG_DeInit(dev->rng_handle);
+	return 0;
+}
+
+unsigned int stm32f4_rng_read(const void *this)
+{
+	if(NULL == this)
+		return -1;
+	struct stm32f4_rng *dev = (struct stm32f4_rng *)this;
+	uint32_t random = 0;
+	HAL_RNG_GenerateRandomNumber(dev->rng_handle, &random);
+	return random;
+}