+++ /dev/null
-/**\r
- ******************************************************************************\r
- * @file stm32l1xx_iwdg.c\r
- * @author MCD Application Team\r
- * @version V1.0.0\r
- * @date 31-December-2010\r
- * @brief This file provides firmware functions to manage the following \r
- * functionalities of the Independent watchdog (IWDG) peripheral: \r
- * - Prescaler and Counter configuration\r
- * - IWDG activation\r
- * - Flag management\r
- *\r
- * @verbatim \r
- * \r
- * ===================================================================\r
- * IWDG features\r
- * ===================================================================\r
- * \r
- * The IWDG can be started by either software or hardware (configurable\r
- * through option byte).\r
- * \r
- * The IWDG is clocked by its own dedicated low-speed clock (LSI) and\r
- * thus stays active even if the main clock fails.\r
- * Once the IWDG is started, the LSI is forced ON and cannot be disabled\r
- * (LSI cannot be disabled too), and the counter starts counting down from \r
- * the reset value of 0xFFF. When it reaches the end of count value (0x000)\r
- * a system reset is generated.\r
- * The IWDG counter should be reloaded at regular intervals to prevent\r
- * an MCU reset.\r
- * \r
- * The IWDG is implemented in the VDD voltage domain that is still functional\r
- * in STOP and STANDBY mode (IWDG reset can wake-up from STANDBY) \r
- * \r
- * IWDGRST flag in RCC_CSR register can be used to inform when a IWDG\r
- * reset occurs\r
- * \r
- * Min-max timeout value @37KHz (LSI): ~108us / ~28.3s\r
- * The IWDG timeout may vary due to LSI frequency dispersion. STM32L1xx\r
- * devices provide the capability to measure the LSI frequency (LSI clock\r
- * connected internally to TIM10 CH1 input capture). The measured value\r
- * can be used to have an IWDG timeout with an acceptable accuracy. \r
- * For more information, please refer to the STM32L1xx Reference manual\r
- * \r
- * \r
- * ===================================================================\r
- * How to use this driver\r
- * ===================================================================\r
- * 1. Enable write access to IWDG_PR and IWDG_RLR registers using\r
- * IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable) function\r
- * \r
- * 2. Configure the IWDG prescaler using IWDG_SetPrescaler() function\r
- * \r
- * 3. Configure the IWDG counter value using IWDG_SetReload() function.\r
- * This value will be loaded in the IWDG counter each time the counter\r
- * is reloaded, then the IWDG will start counting down from this value.\r
- * \r
- * 4. Start the IWDG using IWDG_Enable() function, when the IWDG is used\r
- * in software mode (no need to enable the LSI, it will be enabled\r
- * by hardware)\r
- * \r
- * 5. Then the application program must reload the IWDG counter at regular\r
- * intervals during normal operation to prevent an MCU reset, using\r
- * IWDG_ReloadCounter() function. \r
- * \r
- * @endverbatim\r
- * \r
- ******************************************************************************\r
- * @attention\r
- *\r
- * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS\r
- * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE\r
- * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY\r
- * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING\r
- * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE\r
- * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.\r
- *\r
- * <h2><center>© COPYRIGHT 2010 STMicroelectronics</center></h2>\r
- ****************************************************************************** \r
- */ \r
-\r
-/* Includes ------------------------------------------------------------------*/\r
-#include "stm32l1xx_iwdg.h"\r
-\r
-/** @addtogroup STM32L1xx_StdPeriph_Driver\r
- * @{\r
- */\r
-\r
-/** @defgroup IWDG \r
- * @brief IWDG driver modules\r
- * @{\r
- */ \r
-\r
-/* Private typedef -----------------------------------------------------------*/\r
-/* Private define ------------------------------------------------------------*/\r
-/* ---------------------- IWDG registers bit mask ----------------------------*/\r
-/* KR register bit mask */\r
-#define KR_KEY_RELOAD ((uint16_t)0xAAAA)\r
-#define KR_KEY_ENABLE ((uint16_t)0xCCCC)\r
-\r
-/* Private macro -------------------------------------------------------------*/\r
-/* Private variables ---------------------------------------------------------*/\r
-/* Private function prototypes -----------------------------------------------*/\r
-/* Private functions ---------------------------------------------------------*/\r
-\r
-/** @defgroup IWDG_Private_Functions\r
- * @{\r
- */\r
-\r
-/** @defgroup IWDG_Group1 Prescaler and Counter configuration functions\r
- * @brief Prescaler and Counter configuration functions\r
- *\r
-@verbatim \r
- ===============================================================================\r
- Prescaler and Counter configuration functions\r
- =============================================================================== \r
-\r
-@endverbatim\r
- * @{\r
- */\r
-\r
-/**\r
- * @brief Enables or disables write access to IWDG_PR and IWDG_RLR registers.\r
- * @param IWDG_WriteAccess: new state of write access to IWDG_PR and IWDG_RLR registers.\r
- * This parameter can be one of the following values:\r
- * @arg IWDG_WriteAccess_Enable: Enable write access to IWDG_PR and IWDG_RLR registers\r
- * @arg IWDG_WriteAccess_Disable: Disable write access to IWDG_PR and IWDG_RLR registers\r
- * @retval None\r
- */\r
-void IWDG_WriteAccessCmd(uint16_t IWDG_WriteAccess)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_IWDG_WRITE_ACCESS(IWDG_WriteAccess));\r
- IWDG->KR = IWDG_WriteAccess;\r
-}\r
-\r
-/**\r
- * @brief Sets IWDG Prescaler value.\r
- * @param IWDG_Prescaler: specifies the IWDG Prescaler value.\r
- * This parameter can be one of the following values:\r
- * @arg IWDG_Prescaler_4: IWDG prescaler set to 4\r
- * @arg IWDG_Prescaler_8: IWDG prescaler set to 8\r
- * @arg IWDG_Prescaler_16: IWDG prescaler set to 16\r
- * @arg IWDG_Prescaler_32: IWDG prescaler set to 32\r
- * @arg IWDG_Prescaler_64: IWDG prescaler set to 64\r
- * @arg IWDG_Prescaler_128: IWDG prescaler set to 128\r
- * @arg IWDG_Prescaler_256: IWDG prescaler set to 256\r
- * @retval None\r
- */\r
-void IWDG_SetPrescaler(uint8_t IWDG_Prescaler)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_IWDG_PRESCALER(IWDG_Prescaler));\r
- IWDG->PR = IWDG_Prescaler;\r
-}\r
-\r
-/**\r
- * @brief Sets IWDG Reload value.\r
- * @param Reload: specifies the IWDG Reload value.\r
- * This parameter must be a number between 0 and 0x0FFF.\r
- * @retval None\r
- */\r
-void IWDG_SetReload(uint16_t Reload)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_IWDG_RELOAD(Reload));\r
- IWDG->RLR = Reload;\r
-}\r
-\r
-/**\r
- * @brief Reloads IWDG counter with value defined in the reload register\r
- * (write access to IWDG_PR and IWDG_RLR registers disabled).\r
- * @param None\r
- * @retval None\r
- */\r
-void IWDG_ReloadCounter(void)\r
-{\r
- IWDG->KR = KR_KEY_RELOAD;\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/** @defgroup IWDG_Group2 IWDG activation function\r
- * @brief IWDG activation function \r
- *\r
-@verbatim \r
- ===============================================================================\r
- IWDG activation function\r
- =============================================================================== \r
-\r
-@endverbatim\r
- * @{\r
- */\r
-\r
-/**\r
- * @brief Enables IWDG (write access to IWDG_PR and IWDG_RLR registers disabled).\r
- * @param None\r
- * @retval None\r
- */\r
-void IWDG_Enable(void)\r
-{\r
- IWDG->KR = KR_KEY_ENABLE;\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/** @defgroup IWDG_Group3 Flag management function \r
- * @brief Flag management function \r
- *\r
-@verbatim \r
- ===============================================================================\r
- Flag management function \r
- =============================================================================== \r
-\r
-@endverbatim\r
- * @{\r
- */\r
-\r
-/**\r
- * @brief Checks whether the specified IWDG flag is set or not.\r
- * @param IWDG_FLAG: specifies the flag to check.\r
- * This parameter can be one of the following values:\r
- * @arg IWDG_FLAG_PVU: Prescaler Value Update on going\r
- * @arg IWDG_FLAG_RVU: Reload Value Update on going\r
- * @retval The new state of IWDG_FLAG (SET or RESET).\r
- */\r
-FlagStatus IWDG_GetFlagStatus(uint16_t IWDG_FLAG)\r
-{\r
- FlagStatus bitstatus = RESET;\r
- /* Check the parameters */\r
- assert_param(IS_IWDG_FLAG(IWDG_FLAG));\r
- if ((IWDG->SR & IWDG_FLAG) != (uint32_t)RESET)\r
- {\r
- bitstatus = SET;\r
- }\r
- else\r
- {\r
- bitstatus = RESET;\r
- }\r
- /* Return the flag status */\r
- return bitstatus;\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/\r
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