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/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-05-06 Zero-Free first version
*/
#include <board.h>
#include <drv_lptim.h>
static LPTIM_HandleTypeDef LptimHandle;
void HAL_LPTIM_MspInit(LPTIM_HandleTypeDef *hlptim)
{
if (hlptim->Instance == LPTIM1)
{
/* Peripheral clock enable */
__HAL_RCC_LPTIM1_CLK_ENABLE();
}
}
void LPTIM1_IRQHandler(void)
{
HAL_LPTIM_IRQHandler(&LptimHandle);
}
void HAL_LPTIM_CompareMatchCallback(LPTIM_HandleTypeDef *hlptim)
{
/* enter interrupt */
rt_interrupt_enter();
/* leave interrupt */
rt_interrupt_leave();
}
/**
* This function get current count value of LPTIM
*
* @return the count vlaue
*/
rt_uint32_t stm32l4_lptim_get_current_tick(void)
{
return HAL_LPTIM_ReadCounter(&LptimHandle);
}
/**
* This function get the max value that LPTIM can count
*
* @return the max count
*/
rt_uint32_t stm32l4_lptim_get_tick_max(void)
{
return (0xFFFF);
}
/**
* This function start LPTIM with reload value
*
* @param reload The value that LPTIM count down from
*
* @return RT_EOK
*/
rt_err_t stm32l4_lptim_start(rt_uint32_t reload)
{
HAL_LPTIM_TimeOut_Start_IT(&LptimHandle, 0xFFFF, reload);
return (RT_EOK);
}
/**
* This function stop LPTIM
*/
void stm32l4_lptim_stop(void)
{
rt_uint32_t _ier;
_ier = LptimHandle.Instance->IER;
LptimHandle.Instance->ICR = LptimHandle.Instance->ISR & _ier;
}
/**
* This function get the count clock of LPTIM
*
* @return the count clock frequency in Hz
*/
rt_uint32_t stm32l4_lptim_get_countfreq(void)
{
return 32000 / 32;
}
/**
* This function initialize the lptim
*/
int stm32l4_hw_lptim_init(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_PeriphCLKInitTypeDef RCC_PeriphCLKInitStruct = {0};
/* Enable LSI clock */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI;
RCC_OscInitStruct.LSIState = RCC_LSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
/* Select the LSI clock as LPTIM peripheral clock */
RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;
RCC_PeriphCLKInitStruct.Lptim1ClockSelection = RCC_LPTIM1CLKSOURCE_LSI;
HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct);
LptimHandle.Instance = LPTIM1;
LptimHandle.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
LptimHandle.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV32;
LptimHandle.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
LptimHandle.Init.OutputPolarity = LPTIM_OUTPUTPOLARITY_HIGH;
LptimHandle.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
LptimHandle.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
if (HAL_LPTIM_Init(&LptimHandle) != HAL_OK)
{
return -1;
}
NVIC_ClearPendingIRQ(LPTIM1_IRQn);
NVIC_SetPriority(LPTIM1_IRQn, 0);
NVIC_EnableIRQ(LPTIM1_IRQn);
return 0;
}
INIT_DEVICE_EXPORT(stm32l4_hw_lptim_init);
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