init

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diff --git a/src/entropy/stm_init.c b/src/entropy/stm_init.c
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+/**
+  ******************************************************************************
+  * @file    GPIO/GPIO_IOToggle/Src/main.c
+  * @author  MCD Application Team
+  * @version V1.0.1
+  * @date    26-February-2014
+  * @brief   This example describes how to configure and use GPIOs through
+  *          the STM32F4xx HAL API.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm_init.h"
+//#include "stm32f4xx_hal.h"
+//#include "stm32f4xx_hal_rcc.h"
+
+
+/** @addtogroup STM32F4xx_HAL_Examples
+  * @{
+  */
+
+/** @addtogroup GPIO_IOToggle
+  * @{
+  */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+
+#define UART1_BAUD_RATE 460800
+
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+
+static GPIO_InitTypeDef  GPIO_InitStruct;
+TIM_HandleTypeDef htim2;
+UART_HandleTypeDef huart1;
+DMA_HandleTypeDef hdma_tim;
+
+/* Private function prototypes -----------------------------------------------*/
+static void SystemClock_Config(void);
+static void Error_Handler(void);
+static void MX_GPIO_Init(void);
+static void MX_TIM2_Init(uint32_t *counters_buf, uint16_t counters);
+static void MX_USART1_UART_Init(void);
+/* Private functions ---------------------------------------------------------*/
+
+/**
+  * @brief  Main program
+  * @param  None
+  * @retval None
+  */
+void stm_init(uint32_t *buf0, uint16_t counters)
+{
+ /* Generic STM32 initialization.
+
+    To proceed, 3 steps are required: */
+
+  /* STM32F4xx HAL library initialization:
+       - Configure the Flash prefetch, instruction and Data caches
+       - Configure the Systick to generate an interrupt each 1 msec
+       - Set NVIC Group Priority to 4
+       - Global MSP (MCU Support Package) initialization
+     */
+  HAL_Init();
+
+  /* Configure the system clock */
+  SystemClock_Config();
+
+  /* System interrupt init*/
+  /* Sets the priority grouping field */
+  HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_0);
+  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
+
+  /* Initialize all configured peripherals */
+  MX_GPIO_Init();
+  MX_TIM2_Init(buf0, counters);
+  MX_USART1_UART_Init();
+}
+
+
+/**
+  * @brief  System Clock Configuration
+  *         The system Clock is configured as follow :
+  *            System Clock source            = PLL (HSE)
+  *            SYSCLK(Hz)                     = 42000000
+  *            HCLK(Hz)                       = 42000000
+  *            AHB Prescaler                  = 1
+  *            APB1 Prescaler                 = 1
+  *            APB2 Prescaler                 = 1
+  *            HSI Frequency(Hz)              = 16000000
+  *            PLL_M                          = 8
+  *            PLL_N                          = 336
+  *            PLL_P                          = 8
+  *            PLL_Q                          = 7 (unused)
+  *            VDD(V)                         = 3.3
+  *            Main regulator output voltage  = Scale2 mode
+  *            Flash Latency(WS)              = 1
+  * @param  None
+  * @retval None
+  */
+static void SystemClock_Config(void)
+{
+  RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_OscInitTypeDef RCC_OscInitStruct;
+
+  /* Enable Power Control clock */
+  __PWR_CLK_ENABLE();
+
+  /* The voltage scaling allows optimizing the power consumption when the device is
+     clocked below the maximum system frequency, to update the voltage scaling value
+     regarding system frequency refer to product datasheet.  */
+  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
+
+  /* Enable HSE Oscillator and activate PLL with HSE as source.
+   *
+   * With 8 MHz HSE oscillator, M=/8, N=*336, P=/8 gives 42 MHz SYSCLK.
+   * Divider Q is unused in this configuration.
+   */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLM = 8;
+  RCC_OscInitStruct.PLL.PLLN = 336;
+  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV8;
+  RCC_OscInitStruct.PLL.PLLQ = 7;
+
+  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+    Error_Handler();
+  }
+
+  /* Select PLL as system clock source */
+  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;		/* AHB prescaler */
+  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;		/* APB1 prescaler /1 gives 42 MHz APB1 */
+  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;		/* APB2 prescaler /1 gives 42 MHz APB2 */
+  if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) {
+    Error_Handler();
+  }
+
+}
+
+
+/** Configure pins as
+
+     PB12   ------> GREEN LED
+     PB13   ------> YELLOW LED
+     PB14   ------> GREEN lED
+     PB15   ------> BLUE LED
+     PA1    ------> TIM2_CH2 (Avalanche noise)
+*/
+void MX_GPIO_Init(void)
+{
+  /* GPIO Ports Clock Enable */
+  __GPIOA_CLK_ENABLE();
+  __GPIOB_CLK_ENABLE();
+  __GPIOC_CLK_ENABLE();
+
+  /*Configure LED GPIO pins PB12==red, PB13==yellow, PB14==green, PB15==blue */
+  GPIO_InitStruct.Pin = LED_RED | LED_YELLOW | LED_GREEN | LED_BLUE;
+  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
+  GPIO_InitStruct.Pull = GPIO_NOPULL;
+  GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
+  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);
+
+  /* Configure PA1 (TIM2_Channel2) (Avalanche noise trigger) */
+  GPIO_InitStruct.Pin = GPIO_PIN_1;
+  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+  GPIO_InitStruct.Pull = GPIO_PULLUP;
+  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+  GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
+  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+}
+
+/* TIM2 init function.
+ * TIM2 is used in capture mode, triggered off the avalanche noise pin PA1.
+ */
+void MX_TIM2_Init(uint32_t *counters_buf, uint16_t counters)
+{
+  TIM_IC_InitTypeDef sICConfig;
+
+  __DMA1_CLK_ENABLE();
+  __TIM2_CLK_ENABLE();
+  __GPIOA_CLK_ENABLE();
+
+  htim2.Instance = TIM2;
+  htim2.Init.Prescaler = 0;
+  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
+  htim2.Init.Period = 0xffff;
+  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
+  htim2.Init.RepetitionCounter = 0;
+
+  /* Configure the Input Capture of channel 2.
+   * Trigger on rising edge. ICFilter = 0 means trigger on every event.
+   */
+  sICConfig.ICPolarity  = TIM_ICPOLARITY_RISING;
+  sICConfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
+  sICConfig.ICPrescaler = TIM_ICPSC_DIV1;
+  sICConfig.ICFilter    = 0;  /* If set - Ignore additional state changes for a short while */
+
+  if (HAL_TIM_IC_Init(&htim2) != HAL_OK) {
+    /* Initialization Error */
+    Error_Handler();
+  }
+
+  if (HAL_TIM_IC_ConfigChannel(&htim2, &sICConfig, TIM_CHANNEL_2) != HAL_OK) {
+    /* Initialization Error */
+    Error_Handler();
+  }
+
+  /* Start the TIM input capture operation */
+  if (HAL_TIM_IC_Start_DMA(&htim2, TIM_CHANNEL_2, counters_buf, counters) != HAL_OK) {
+    /* Starting Error */
+    Error_Handler();
+  }
+}
+
+
+/* USART1 init function
+ *
+ * USART1 uses PA9 and PA10.
+ */
+void MX_USART1_UART_Init(void)
+{
+
+  huart1.Instance          = USART1;
+  huart1.Init.BaudRate     = UART1_BAUD_RATE;
+  huart1.Init.WordLength   = UART_WORDLENGTH_8B;
+  huart1.Init.StopBits     = UART_STOPBITS_1;
+  huart1.Init.Parity       = UART_PARITY_NONE;
+  huart1.Init.Mode         = UART_MODE_TX; /* Only Transmit */
+  huart1.Init.HwFlowCtl    = UART_HWCONTROL_NONE;
+  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
+
+  if (HAL_UART_Init(&huart1) != HAL_OK) {
+    /* Initialization Error */
+    Error_Handler();
+  }
+}
+
+
+/**
+  * @brief  This function is executed in case of error occurrence.
+  * @param  None
+  * @retval None
+  */
+static void Error_Handler(void)
+{
+  HAL_GPIO_WritePin(LED_PORT, LED_RED, GPIO_PIN_SET);
+  while(1) { ;  }
+}
+
+#ifdef  USE_FULL_ASSERT
+
+/**
+  * @brief  Reports the name of the source file and the source line number
+  *         where the assert_param error has occurred.
+  * @param  file: pointer to the source file name
+  * @param  line: assert_param error line source number
+  * @retval None
+  */
+void assert_failed(uint8_t* file, uint32_t line)
+{
+  /* User can add his own implementation to report the file name and line number,
+     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
+
+  /* Infinite loop */
+  while (1)
+  {
+  }
+}
+#endif
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/