/**
* @brief Configures TIM21 to measure the LSI oscillator frequency.
* @param None
* @retval LSI Frequency
*/
static uint32_t GetLSIFrequency(void)
{
TIM_IC_InitTypeDef TIMInput_Config;
/* Configure the TIM peripheral *********************************************/
/* Set TIMx instance */
Input_Handle.Instance = TIM21;
/* TIM21 configuration: Input Capture mode ---------------------
The LSI oscillator is connected to TIM21 CH1.
The Rising edge is used as active edge.
The TIM21 CCR1 is used to compute the frequency value.
------------------------------------------------------------ */
Input_Handle.Init.Prescaler = 0;
Input_Handle.Init.CounterMode = TIM_COUNTERMODE_UP;
Input_Handle.Init.Period = 0xFFFF;
Input_Handle.Init.ClockDivision = 0;
if(HAL_TIM_IC_Init(&Input_Handle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Connect internally the TIM21_CH1 Input Capture to the LSI clock output */
HAL_TIMEx_RemapConfig(&Input_Handle, TIM21_TI1_LSI);
/* Configure the Input Capture of channel 1 */
TIMInput_Config.ICPolarity = TIM_ICPOLARITY_RISING;
TIMInput_Config.ICSelection = TIM_ICSELECTION_DIRECTTI;
TIMInput_Config.ICPrescaler = TIM_ICPSC_DIV8;
TIMInput_Config.ICFilter = 0;
if(HAL_TIM_IC_ConfigChannel(&Input_Handle, &TIMInput_Config, TIM_CHANNEL_1) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Start the TIM Input Capture measurement in interrupt mode */
if(HAL_TIM_IC_Start_IT(&Input_Handle, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
/* Wait until the TIM21 get 2 LSI edges */
while(uwCaptureNumber != 2)
{
}
/* Disable TIM21 CC1 Interrupt Request */
HAL_TIM_IC_Stop_IT(&Input_Handle, TIM_CHANNEL_1);
/* Deinitialize the TIM21 peripheral registers to their default reset values */
HAL_TIM_IC_DeInit(&Input_Handle);
return uwLsiFreq;
}
/**
* @brief Configures TIM2 channel 4 in input capture mode
* @param None
* @retval None
*/
static void TIM_Config(void)
{
/*##-1- Configure the TIM peripheral #######################################*/
/* Set TIMx instance */
TimHandle.Instance = TIMx;
/* Initialize TIMx peripheral as follow:
+ Period = 0xFFFF
+ Prescaler = 0
+ ClockDivision = 0
+ Counter direction = Up
*/
TimHandle.Init.Period = 0xFFFF;
TimHandle.Init.Prescaler = 0;
TimHandle.Init.ClockDivision = 0;
TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
if(HAL_TIM_IC_Init(&TimHandle) != HAL_OK)
{
/* Error */
ErrorHandler();
}
HAL_TIMEx_RemapConfig(&TimHandle, TIM2_TI4_COMP1);
/*##-2- Configure the Input Capture channel ################################*/
/* Configure the Input Capture of channel 4 */
sICConfig.ICPolarity = TIM_ICPOLARITY_BOTHEDGE;
sICConfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
sICConfig.ICPrescaler = TIM_ICPSC_DIV1;
sICConfig.ICFilter = 0;
if(HAL_TIM_IC_ConfigChannel(&TimHandle, &sICConfig, TIM_CHANNEL_4) != HAL_OK)
{
/* Configuration Error */
ErrorHandler();
}
/*##-3- Start the Input Capture in interrupt mode ##########################*/
if(HAL_TIM_IC_Start_IT(&TimHandle, TIM_CHANNEL_4) != HAL_OK)
{
/* Starting Error */
ErrorHandler();
}
}
/**
* @brief Configures TIM5 to measure the LSI oscillator frequency.
* @param None
* @retval LSI Frequency
*/
static uint32_t GetLSIFrequency(void)
{
uint32_t pclk1 = 0, latency = 0;
TIM_IC_InitTypeDef timinputconfig = {0};
RCC_OscInitTypeDef oscinit = {0};
RCC_ClkInitTypeDef clkinit = {0};
/* Enable LSI Oscillator */
oscinit.OscillatorType = RCC_OSCILLATORTYPE_LSI;
oscinit.LSIState = RCC_LSI_ON;
oscinit.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&oscinit)!= HAL_OK)
{
Error_Handler();
}
/* Configure the TIM peripheral */
/* Set TIMx instance */
TimInputCaptureHandle.Instance = TIMx;
/* TIMx configuration: Input Capture mode ---------------------
The LSI clock is connected to TIM5 CH4.
The Rising edge is used as active edge.
The TIM5 CCR4 is used to compute the frequency value.
------------------------------------------------------------ */
TimInputCaptureHandle.Init.Prescaler = 0;
TimInputCaptureHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
TimInputCaptureHandle.Init.Period = 0xFFFF;
TimInputCaptureHandle.Init.ClockDivision = 0;
TimInputCaptureHandle.Init.RepetitionCounter = 0;
if (HAL_TIM_IC_Init(&TimInputCaptureHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Connect internally the TIM5 CH4 Input Capture to the LSI clock output */
HAL_TIMEx_RemapConfig(&TimInputCaptureHandle, TIMx_REMAP);
/* Configure the Input Capture of channel 4 */
timinputconfig.ICPolarity = TIM_ICPOLARITY_RISING;
timinputconfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
timinputconfig.ICPrescaler = TIM_ICPSC_DIV8;
timinputconfig.ICFilter = 0;
if (HAL_TIM_IC_ConfigChannel(&TimInputCaptureHandle, &timinputconfig, TIM_CHANNEL_4) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Reset the flags */
TimInputCaptureHandle.Instance->SR = 0;
/* Start the TIM Input Capture measurement in interrupt mode */
if (HAL_TIM_IC_Start_IT(&TimInputCaptureHandle, TIM_CHANNEL_4) != HAL_OK)
{
/* Starting Error */
Error_Handler();
}
/* Wait until the TIM5 get 2 LSI edges (refer to TIM5_IRQHandler() in
stm32f4xx_it.c file) */
while (uwMeasurementDone == 0)
{
}
uwCaptureNumber = 0;
/* Deinitialize the TIM5 peripheral registers to their default reset values */
HAL_TIM_IC_DeInit(&TimInputCaptureHandle);
/* Compute the LSI frequency, depending on TIM5 input clock frequency (PCLK1)*/
/* Get PCLK1 frequency */
pclk1 = HAL_RCC_GetPCLK1Freq();
HAL_RCC_GetClockConfig(&clkinit, &latency);
/* Get PCLK1 prescaler */
if ((clkinit.APB1CLKDivider) == RCC_HCLK_DIV1)
{
/* PCLK1 prescaler equal to 1 => TIMCLK = PCLK1 */
return ((pclk1 / uwPeriodValue) * 8);
}
else
{
/* PCLK1 prescaler different from 1 => TIMCLK = 2 * PCLK1 */
return (((2 * pclk1) / uwPeriodValue) * 8) ;
}
}
/**
* @brief Configures TIM5 to measure the LSI oscillator frequency.
* @param None
* @retval LSI Frequency
*/
static uint32_t GetLSIFrequency(void)
{
uint32_t pclk1 = 0;
TIM_IC_InitTypeDef timinputconfig;
/* Enable the LSI oscillator */
__HAL_RCC_LSI_ENABLE();
/* Wait till LSI is ready */
while (__HAL_RCC_GET_FLAG(RCC_FLAG_LSIRDY) == RESET)
{
}
/* Configure the TIM peripheral */
/* Set TIMx instance */
TimInputCaptureHandle.Instance = TIM5;
/* 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.
------------------------------------------------------------ */
TimInputCaptureHandle.Init.Prescaler = 0;
TimInputCaptureHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
TimInputCaptureHandle.Init.Period = 0xFFFF;
TimInputCaptureHandle.Init.ClockDivision = 0;
TimInputCaptureHandle.Init.RepetitionCounter = 0;
if(HAL_TIM_IC_Init(&TimInputCaptureHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Connect internally the TIM5_CH4 Input Capture to the LSI clock output */
HAL_TIMEx_RemapConfig(&TimInputCaptureHandle, TIM_TIM5_LSI);
/* Configure the Input Capture of channel 4 */
timinputconfig.ICPolarity = TIM_ICPOLARITY_RISING;
timinputconfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
timinputconfig.ICPrescaler = TIM_ICPSC_DIV8;
timinputconfig.ICFilter = 0;
if(HAL_TIM_IC_ConfigChannel(&TimInputCaptureHandle, &timinputconfig, TIM_CHANNEL_4) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Reset the flags */
TimInputCaptureHandle.Instance->SR = 0;
/* Start the TIM Input Capture measurement in interrupt mode */
if(HAL_TIM_IC_Start_IT(&TimInputCaptureHandle, TIM_CHANNEL_4) != HAL_OK)
{
Error_Handler();
}
/* Wait until the TIM5 get 2 LSI edges (refer to TIM5_IRQHandler() in
stm32f4xx_it.c file) */
while(uwMeasurementDone == 0)
{
}
uwCaptureNumber = 0;
/* Deinitialize the TIM5 peripheral registers to their default reset values */
HAL_TIM_IC_DeInit(&TimInputCaptureHandle);
/* Compute the LSI frequency, depending on TIM5 input clock frequency (PCLK1)*/
/* Get PCLK1 frequency */
pclk1 = HAL_RCC_GetPCLK1Freq();
/* Get PCLK1 prescaler */
if((RCC->CFGR & RCC_CFGR_PPRE1) == 0)
{
/* PCLK1 prescaler equal to 1 => TIMCLK = PCLK1 */
return ((pclk1 / uwPeriodValue) * 8);
}
else
{ /* PCLK1 prescaler different from 1 => TIMCLK = 2 * PCLK1 */
return (((2 * pclk1) / uwPeriodValue) * 8);
}
}