mirror of
https://github.com/IcedRooibos/py32f0-template.git
synced 2025-10-31 01:42:04 -07:00
243 lines
8.6 KiB
C
243 lines
8.6 KiB
C
/**
|
|
******************************************************************************
|
|
* @file py32f0xx_hal_iwdg.c
|
|
* @author MCU Application Team
|
|
* @brief IWDG HAL module driver.
|
|
* This file provides firmware functions to manage the following
|
|
* functionalities of the Independent Watchdog (IWDG) peripheral:
|
|
* + Initialization and Start functions
|
|
* + IO operation functions
|
|
*
|
|
@verbatim
|
|
==============================================================================
|
|
##### IWDG Generic features #####
|
|
==============================================================================
|
|
[..]
|
|
(+) The IWDG can be started by either software or hardware (configurable
|
|
through option byte).
|
|
|
|
(+) The IWDG is clocked by Low-Speed clock (LSI) and thus stays active even
|
|
if the main clock fails.
|
|
|
|
(+) Once the IWDG is started, the LSI is forced ON and both can not be
|
|
disabled. The counter starts counting down from the reset value (0xFFF).
|
|
When it reaches the end of count value (0x000) a reset signal is
|
|
generated (IWDG reset).
|
|
|
|
(+) Whenever the key value 0x0000 AAAA is written in the IWDG_KR register,
|
|
the IWDG_RLR value is reloaded in the counter and the watchdog reset is
|
|
prevented.
|
|
|
|
(+) The IWDG is implemented in the VDD voltage domain that is still functional
|
|
in STOP and STANDBY mode (IWDG reset can wake-up from STANDBY).
|
|
IWDGRST flag in RCC_CSR register can be used to inform when an IWDG
|
|
reset occurs.
|
|
|
|
(+) Debug mode : When the microcontroller enters debug mode (core halted),
|
|
the IWDG counter either continues to work normally or stops, depending
|
|
on DBG_IWDG_STOP configuration bit in DBG module, accessible through
|
|
__HAL_DBGMCU_FREEZE_IWDG() and __HAL_DBGMCU_UNFREEZE_IWDG() macros
|
|
|
|
[..] Min-max timeout value @32KHz (LSI): ~125us / ~32.7s
|
|
The IWDG timeout may vary due to LSI frequency dispersion. PY32F0xx
|
|
devices provide the capability to measure the LSI frequency (LSI clock
|
|
connected internally to TIM5 CH4 input capture). The measured value
|
|
can be used to have an IWDG timeout with an acceptable accuracy.
|
|
|
|
##### How to use this driver #####
|
|
==============================================================================
|
|
[..]
|
|
(#) Use IWDG using HAL_IWDG_Init() function to :
|
|
(++) Enable instance by writing Start keyword in IWDG_KEY register. LSI
|
|
clock is forced ON and IWDG counter starts downcounting.
|
|
(++) Enable write access to configuration register: IWDG_PR & IWDG_RLR.
|
|
(++) Configure the IWDG prescaler and counter reload value. This reload
|
|
value will be loaded in the IWDG counter each time the watchdog is
|
|
reloaded, then the IWDG will start counting down from this value.
|
|
(++) wait for status flags to be reset"
|
|
|
|
(#) Then the application program must refresh the IWDG counter at regular
|
|
intervals during normal operation to prevent an MCU reset, using
|
|
HAL_IWDG_Refresh() function.
|
|
|
|
*** IWDG HAL driver macros list ***
|
|
====================================
|
|
[..]
|
|
Below the list of most used macros in IWDG HAL driver:
|
|
(+) __HAL_IWDG_START: Enable the IWDG peripheral
|
|
(+) __HAL_IWDG_RELOAD_COUNTER: Reloads IWDG counter with value defined in
|
|
the reload register
|
|
|
|
@endverbatim
|
|
******************************************************************************
|
|
* @attention
|
|
*
|
|
* <h2><center>© Copyright (c) Puya Semiconductor Co.
|
|
* All rights reserved.</center></h2>
|
|
*
|
|
* <h2><center>© Copyright (c) 2016 STMicroelectronics.
|
|
* All rights reserved.</center></h2>
|
|
*
|
|
* This software component is licensed by ST under BSD 3-Clause license,
|
|
* the "License"; You may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at:
|
|
* opensource.org/licenses/BSD-3-Clause
|
|
*
|
|
******************************************************************************
|
|
*/
|
|
|
|
/* Includes ------------------------------------------------------------------*/
|
|
#include "py32f0xx_hal.h"
|
|
|
|
/** @addtogroup PY32F0xx_HAL_Driver
|
|
* @{
|
|
*/
|
|
|
|
#ifdef HAL_IWDG_MODULE_ENABLED
|
|
/** @defgroup IWDG IWDG
|
|
* @brief IWDG HAL module driver.
|
|
* @{
|
|
*/
|
|
|
|
/* Private typedef -----------------------------------------------------------*/
|
|
/* Private define ------------------------------------------------------------*/
|
|
/** @defgroup IWDG_Private_Defines IWDG Private Defines
|
|
* @{
|
|
*/
|
|
/* Status register need 5 RC LSI divided by prescaler clock to be updated. With
|
|
higher prescaler (256), and according to HSI variation, we need to wait at
|
|
least 6 cycles so 48 ms. */
|
|
#define HAL_IWDG_DEFAULT_TIMEOUT 48U
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/* Private macro -------------------------------------------------------------*/
|
|
/* Private variables ---------------------------------------------------------*/
|
|
/* Private function prototypes -----------------------------------------------*/
|
|
/* Exported functions --------------------------------------------------------*/
|
|
|
|
/** @addtogroup IWDG_Exported_Functions
|
|
* @{
|
|
*/
|
|
|
|
/** @addtogroup IWDG_Exported_Functions_Group1
|
|
* @brief Initialization and Start functions.
|
|
*
|
|
@verbatim
|
|
===============================================================================
|
|
##### Initialization and Start functions #####
|
|
===============================================================================
|
|
[..] This section provides functions allowing to:
|
|
(+) Initialize the IWDG according to the specified parameters in the
|
|
IWDG_InitTypeDef of associated handle.
|
|
(+) Once initialization is performed in HAL_IWDG_Init function, Watchdog
|
|
is reloaded in order to exit function with correct time base.
|
|
|
|
@endverbatim
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @brief Initialize the IWDG according to the specified parameters in the
|
|
* IWDG_InitTypeDef and start watchdog. Before exiting function,
|
|
* watchdog is refreshed in order to have correct time base.
|
|
* @param hiwdg pointer to a IWDG_HandleTypeDef structure that contains
|
|
* the configuration information for the specified IWDG module.
|
|
* @retval HAL status
|
|
*/
|
|
HAL_StatusTypeDef HAL_IWDG_Init(IWDG_HandleTypeDef *hiwdg)
|
|
{
|
|
uint32_t tickstart;
|
|
|
|
/* Check the IWDG handle allocation */
|
|
if (hiwdg == NULL)
|
|
{
|
|
return HAL_ERROR;
|
|
}
|
|
|
|
/* Check the parameters */
|
|
assert_param(IS_IWDG_ALL_INSTANCE(hiwdg->Instance));
|
|
assert_param(IS_IWDG_PRESCALER(hiwdg->Init.Prescaler));
|
|
assert_param(IS_IWDG_RELOAD(hiwdg->Init.Reload));
|
|
|
|
/* Enable IWDG. LSI requires ready */
|
|
__HAL_IWDG_START(hiwdg);
|
|
|
|
/* Enable write access to IWDG_PR and IWDG_RLR registers by writing 0x5555 in KR */
|
|
IWDG_ENABLE_WRITE_ACCESS(hiwdg);
|
|
|
|
/* Write to IWDG registers the Prescaler & Reload values to work with */
|
|
hiwdg->Instance->PR = hiwdg->Init.Prescaler;
|
|
hiwdg->Instance->RLR = hiwdg->Init.Reload;
|
|
|
|
/* Check pending flag, if previous update not done, return timeout */
|
|
tickstart = HAL_GetTick();
|
|
|
|
/* Wait for register to be updated */
|
|
while (hiwdg->Instance->SR != RESET)
|
|
{
|
|
if ((HAL_GetTick() - tickstart) > HAL_IWDG_DEFAULT_TIMEOUT)
|
|
{
|
|
return HAL_TIMEOUT;
|
|
}
|
|
}
|
|
/* Reload IWDG counter with value defined in the reload register */
|
|
__HAL_IWDG_RELOAD_COUNTER(hiwdg);
|
|
|
|
/* Return function status */
|
|
return HAL_OK;
|
|
}
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/** @addtogroup IWDG_Exported_Functions_Group2
|
|
* @brief IO operation functions
|
|
*
|
|
@verbatim
|
|
===============================================================================
|
|
##### IO operation functions #####
|
|
===============================================================================
|
|
[..] This section provides functions allowing to:
|
|
(+) Refresh the IWDG.
|
|
|
|
@endverbatim
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @brief Refresh the IWDG.
|
|
* @param hiwdg pointer to a IWDG_HandleTypeDef structure that contains
|
|
* the configuration information for the specified IWDG module.
|
|
* @retval HAL status
|
|
*/
|
|
HAL_StatusTypeDef HAL_IWDG_Refresh(IWDG_HandleTypeDef *hiwdg)
|
|
{
|
|
/* Reload IWDG counter with value defined in the reload register */
|
|
__HAL_IWDG_RELOAD_COUNTER(hiwdg);
|
|
|
|
/* Return function status */
|
|
return HAL_OK;
|
|
}
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif /* HAL_IWDG_MODULE_ENABLED */
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/************************ (C) COPYRIGHT Puya *****END OF FILE****/
|