/**
******************************************************************************
* @file IWDG/IWDG_Reset/main.c
* @author MCD Application Team
* @version V3.5.0
* @date 08-April-2011
* @brief Main program body.
******************************************************************************
* @attention
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
*
© COPYRIGHT 2011 STMicroelectronics
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32_eval.h"
/** @addtogroup STM32F10x_StdPeriph_Examples
* @{
*/
/** @addtogroup IWDG_Reset
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Uncomment/Comment depending on your STM32 device.
The LSI is internally connected to TIM5 IC4 only on STM32F10x Connectivity
line, High-Density Value line, High-Density and XL-Density Devices */
#define LSI_TIM_MEASURE
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint32_t TimingDelay = 0;
__IO uint32_t LsiFreq = 40000;
extern __IO uint16_t CaptureNumber;
/* Private function prototypes -----------------------------------------------*/
void Delay(__IO uint32_t nTime);
void TIM5_ConfigForLSI(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program.
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/
/* Initialize LED1 and Key Button mounted on STM3210X-EVAL board */
STM_EVAL_LEDInit(LED1);
STM_EVAL_LEDInit(LED2);
STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_EXTI);
/* Setup SysTick Timer for 1 msec interrupts */
if (SysTick_Config(SystemCoreClock / 1000))
{
/* Capture error */
while (1);
}
/* Check if the system has resumed from IWDG reset */
if (RCC_GetFlagStatus(RCC_FLAG_IWDGRST) != RESET)
{
/* IWDGRST flag set */
/* Turn on LED1 */
STM_EVAL_LEDOn(LED1);
/* Clear reset flags */
RCC_ClearFlag();
}
else
{
/* IWDGRST flag is not set */
/* Turn off LED1 */
STM_EVAL_LEDOff(LED1);
}
#ifdef LSI_TIM_MEASURE
/* Enable the LSI OSC */
RCC_LSICmd(ENABLE);
/* Wait till LSI is ready */
while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
{}
/* TIM Configuration -------------------------------------------------------*/
TIM5_ConfigForLSI();
/* Wait until the TIM5 get 2 LSI edges */
while(CaptureNumber != 2)
{
}
/* Disable TIM5 CC4 Interrupt Request */
TIM_ITConfig(TIM5, TIM_IT_CC4, DISABLE);
#endif
/* IWDG timeout equal to 250 ms (the timeout may varies due to LSI frequency
dispersion) */
/* Enable write access to IWDG_PR and IWDG_RLR registers */
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
/* IWDG counter clock: LSI/32 */
IWDG_SetPrescaler(IWDG_Prescaler_32);
/* Set counter reload value to obtain 250ms IWDG TimeOut.
Counter Reload Value = 250ms/IWDG counter clock period
= 250ms / (LSI/32)
= 0.25s / (LsiFreq/32)
= LsiFreq/(32 * 4)
= LsiFreq/128
*/
IWDG_SetReload(LsiFreq/128);
/* Reload IWDG counter */
IWDG_ReloadCounter();
/* Enable IWDG (the LSI oscillator will be enabled by hardware) */
IWDG_Enable();
while (1)
{
/* Toggle LED2 */
STM_EVAL_LEDToggle(LED2);
/* Insert 240 ms delay */
Delay(240);
/* Reload IWDG counter */
IWDG_ReloadCounter();
}
}
/**
* @brief Inserts a delay time.
* @param nTime: specifies the delay time length, in milliseconds.
* @retval None
*/
void Delay(__IO uint32_t nTime)
{
TimingDelay = nTime;
while(TimingDelay != 0);
}
#ifdef LSI_TIM_MEASURE
/**
* @brief Configures TIM5 to measure the LSI oscillator frequency.
* @param None
* @retval None
*/
void TIM5_ConfigForLSI(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
/* Enable TIM5 clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
/* Enable the TIM5 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Configure TIM5 prescaler */
TIM_PrescalerConfig(TIM5, 0, TIM_PSCReloadMode_Immediate);
/* Connect internally the TM5_CH4 Input Capture to the LSI clock output */
GPIO_PinRemapConfig(GPIO_Remap_TIM5CH4_LSI, ENABLE);
/* TIM5 configuration: Input Capture mode ---------------------
The LSI oscillator is connected to TIM5 CH4
The Rising edge is used as active edge,
The TIM5 CCR4 is used to compute the frequency value
------------------------------------------------------------ */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_4;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV8;
TIM_ICInitStructure.TIM_ICFilter = 0;
TIM_ICInit(TIM5, &TIM_ICInitStructure);
/* TIM10 Counter Enable */
TIM_Cmd(TIM5, ENABLE);
/* Reset the flags */
TIM5->SR = 0;
/* Enable the CC4 Interrupt Request */
TIM_ITConfig(TIM5, TIM_IT_CC4, ENABLE);
}
#endif
#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 2011 STMicroelectronics *****END OF FILE****/