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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"
+
+/** @addtogroup STM32F4xx_HAL_Examples
+ * @{
+ */
+
+/** @addtogroup GPIO_IOToggle
+ * @{
+ */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+
+#define UART1_BAUD_RATE 921600 /* FTDI/USB */
+#define UART2_BAUD_RATE 115200 /* R-Pi GPIO */
+
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+
+static GPIO_InitTypeDef GPIO_InitStruct;
+TIM_HandleTypeDef htim2;
+UART_HandleTypeDef huart1;
+UART_HandleTypeDef huart2;
+DMA_HandleTypeDef hdma_tim;
+
+/* Private function prototypes -----------------------------------------------*/
+static void SystemClock_Config(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);
+static void MX_USART2_UART_Init(void);
+/* Private functions ---------------------------------------------------------*/
+
+extern void Error_Handler(void);
+
+
+/**
+ * @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();
+ MX_USART2_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_RX;
+ huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+ huart1.Init.OverSampling = UART_OVERSAMPLING_16;
+
+ if (HAL_UART_Init(&huart1) != HAL_OK) {
+ /* Initialization Error */
+ Error_Handler();
+ }
+}
+
+/* USART2 init function */
+void MX_USART2_UART_Init(void)
+{
+ huart2.Instance = USART2;
+ huart2.Init.BaudRate = UART2_BAUD_RATE;
+ huart2.Init.WordLength = UART_WORDLENGTH_8B;
+ huart2.Init.StopBits = UART_STOPBITS_1;
+ huart2.Init.Parity = UART_PARITY_NONE;
+ huart2.Init.Mode = UART_MODE_TX_RX;
+ huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+ huart2.Init.OverSampling = UART_OVERSAMPLING_16;
+
+ if (HAL_UART_Init(&huart2) != HAL_OK) {
+ /* Initialization Error */
+ Error_Handler();
+ }
+}
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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