/* LPTIM1 init function */
void MX_LPTIM1_Init(void)
{
hlptim1.Instance = LPTIM1;
hlptim1.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
hlptim1.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV128;
hlptim1.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
hlptim1.Init.OutputPolarity = LPTIM_OUTPUTPOLARITY_HIGH;
hlptim1.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
hlptim1.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
if (HAL_LPTIM_Init(&hlptim1) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* This sample code shows how to use STM32L0xx HAL API to count .
To proceed, 4 steps are required: */
/* STM32L0xx HAL library initialization:
- Configure the Flash prefetch, Flash preread and Buffer caches
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Low Level Initialization
*/
HAL_Init();
/* Initialize LED3 */
BSP_LED_Init(LED3);
/* Configure the System clock to have a frequency of 2 MHz (Up to 32MHZ possible) */
SystemClock_Config();
/* Enable the LSI Clock */
LSI_ClockEnable();
/* ### - 1 - Re-target the LSI to Clock the LPTIM Counter ################# */
/* Select the LSI clock as LPTIM peripheral clock */
RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;
RCC_PeriphCLKInitStruct.LptimClockSelection = RCC_LPTIM1CLKSOURCE_LSI;
HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct);
/* ### - 2 - Initialize the LPTIM peripheral ############################## */
/*
* Instance = LPTIM1
* Clock Source = APB or LowPowerOSCillator (in this example LSI is
* already selected from the RCC stage)
* Counter source = External event.
* Clock prescaler = 1 (No division)
* Counter Trigger = Software trigger
* Output Polarity = High
* Update mode = Immediate (Registers are immediately updated after any
* write access)
*/
LptimHandle.Instance = LPTIM1;
LptimHandle.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
LptimHandle.Init.CounterSource = LPTIM_COUNTERSOURCE_EXTERNAL;
LptimHandle.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV1;
LptimHandle.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
LptimHandle.Init.OutputPolarity = LPTIM_OUTPUTPOLARITY_HIGH;
LptimHandle.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
/* Initialize LPTIM peripheral according to the passed parameters */
if (HAL_LPTIM_Init(&LptimHandle) != HAL_OK)
{
Error_Handler();
}
/* ### - 3 - Start counting in interrupt mode ############################# */
/*
* Period = 1000
*/
if (HAL_LPTIM_Counter_Start_IT(&LptimHandle, 1000) != HAL_OK)
{
Error_Handler();
}
/* ### - 4 - Enter in Stop mode ########################################### */
HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
/* Infinite Loop */
while (1)
{
}
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* This sample code shows how to use STM32L0xx LPTIM HAL API to generate a
PWM at the lowest power consumption, using an external counter clock, in
Low Power mode (STOP mode).
To proceed, 3 steps are required: */
/* STM32L0xx HAL library initialization:
- Configure the Flash prefetch, Flash preread and Buffer caches
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Low Level Initialization
*/
HAL_Init();
/* Configure the system clock to 2 MHz */
SystemClock_Config();
/* Initialize LED3 */
BSP_LED_Init(LED3);
/* Enable the LSI source */
LSI_ClockEnable();
/* ### - 1 - Re-target the LSI to Clock the LPTIM Counter ################# */
/* Select the LSI clock as LPTIM peripheral clock */
RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;
RCC_PeriphCLKInitStruct.LptimClockSelection = RCC_LPTIM1CLKSOURCE_LSI;
HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct);
/* ### - 2 - Initialize LPTIM peripheral ################################## */
/*
* Instance = LPTIM1.
* Clock Source = APB or LowPowerOSCillator
* Counter source = Internal event.
* Clock prescaler = 1 (No division).
* Counter Trigger = Trigger1: PC3 or PB6 (PC3 in this example).
* Active Edge = Rising edge.
*/
LptimHandle.Instance = LPTIM1;
LptimHandle.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
LptimHandle.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV1;
LptimHandle.Init.Trigger.Source = LPTIM_TRIGSOURCE_0;
LptimHandle.Init.Trigger.ActiveEdge = LPTIM_ACTIVEEDGE_RISING;
LptimHandle.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
/* Initialize LPTIM peripheral according to the passed parameters */
if (HAL_LPTIM_Init(&LptimHandle) != HAL_OK)
{
Error_Handler();
}
/* ### - 3 - Start the Timeout function in interrupt mode ################# */
/*
* Period = 65535
* Pulse = 32767
* According to this configuration (LPTIMER clocked by LSI & compare = 32767,
* the Timeout period = (compare + 1)/LSI_Frequency = 1s
*/
if (HAL_LPTIM_TimeOut_Start_IT(&LptimHandle, Period, Timeout) != HAL_OK)
{
Error_Handler();
}
/* ### - 4 - Enter in Stop mode ########################################### */
HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
/* Infinite Loop */
while (1)
{
}
}
