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