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- /* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2018, STMicroelectronics
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
- */
- #if DEVICE_LPTICKER
- /***********************************************************************/
- /* lpticker_lptim config is 1 in json config file */
- /* LPTICKER is based on LPTIM feature from ST drivers. RTC is not used */
- #if MBED_CONF_TARGET_LPTICKER_LPTIM
- #include "lp_ticker_api.h"
- #include "mbed_error.h"
- LPTIM_HandleTypeDef LptimHandle;
- const ticker_info_t *lp_ticker_get_info()
- {
- static const ticker_info_t info = {
- #if MBED_CONF_TARGET_LSE_AVAILABLE
- LSE_VALUE,
- #else
- LSI_VALUE,
- #endif
- 16
- };
- return &info;
- }
- volatile uint8_t lp_Fired = 0;
- static void LPTIM1_IRQHandler(void);
- static void (*irq_handler)(void);
- void lp_ticker_init(void)
- {
- /* Check if LPTIM is already configured */
- if (__HAL_RCC_LPTIM1_IS_CLK_ENABLED()) {
- lp_ticker_disable_interrupt();
- return;
- }
- RCC_PeriphCLKInitTypeDef RCC_PeriphCLKInitStruct = {0};
- RCC_OscInitTypeDef RCC_OscInitStruct = {0};
- #if MBED_CONF_TARGET_LSE_AVAILABLE
- /* Enable LSE clock */
- RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
- RCC_OscInitStruct.LSEState = RCC_LSE_ON;
- RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
- /* Select the LSE clock as LPTIM peripheral clock */
- RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;
- #if (TARGET_STM32L0)
- RCC_PeriphCLKInitStruct.LptimClockSelection = RCC_LPTIM1CLKSOURCE_LSE;
- #else
- RCC_PeriphCLKInitStruct.Lptim1ClockSelection = RCC_LPTIM1CLKSOURCE_LSE;
- #endif
- #else /* MBED_CONF_TARGET_LSE_AVAILABLE */
- /* Enable LSI clock */
- RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI;
- RCC_OscInitStruct.LSIState = RCC_LSI_ON;
- RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
- /* Select the LSI clock as LPTIM peripheral clock */
- RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;
- #if (TARGET_STM32L0)
- RCC_PeriphCLKInitStruct.LptimClockSelection = RCC_LPTIM1CLKSOURCE_LSI;
- #else
- RCC_PeriphCLKInitStruct.Lptim1ClockSelection = RCC_LPTIM1CLKSOURCE_LSI;
- #endif
- #endif /* MBED_CONF_TARGET_LSE_AVAILABLE */
- if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
- error("HAL_RCC_OscConfig ERROR\n");
- return;
- }
- if (HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct) != HAL_OK) {
- error("HAL_RCCEx_PeriphCLKConfig ERROR\n");
- return;
- }
- __HAL_RCC_LPTIM1_CLK_ENABLE();
- __HAL_RCC_LPTIM1_FORCE_RESET();
- __HAL_RCC_LPTIM1_RELEASE_RESET();
- /* Initialize the LPTIM peripheral */
- LptimHandle.Instance = LPTIM1;
- LptimHandle.State = HAL_LPTIM_STATE_RESET;
- LptimHandle.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
- 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;
- LptimHandle.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
- #if (TARGET_STM32L4)
- LptimHandle.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
- LptimHandle.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
- #endif /* TARGET_STM32L4 */
- if (HAL_LPTIM_Init(&LptimHandle) != HAL_OK) {
- error("HAL_LPTIM_Init ERROR\n");
- return;
- }
- NVIC_SetVector(LPTIM1_IRQn, (uint32_t)LPTIM1_IRQHandler);
- #if !(TARGET_STM32L4)
- /* EXTI lines are not configured by default */
- __HAL_LPTIM_WAKEUPTIMER_EXTI_ENABLE_IT();
- __HAL_LPTIM_WAKEUPTIMER_EXTI_ENABLE_RISING_EDGE();
- #endif
- __HAL_LPTIM_ENABLE_IT(&LptimHandle, LPTIM_IT_CMPM);
- HAL_LPTIM_Counter_Start(&LptimHandle, 0xFFFF);
- /* Need to write a compare value in order to get LPTIM_FLAG_CMPOK in set_interrupt */
- __HAL_LPTIM_COMPARE_SET(&LptimHandle, 0);
- }
- static void LPTIM1_IRQHandler(void)
- {
- LptimHandle.Instance = LPTIM1;
- if (lp_Fired) {
- lp_Fired = 0;
- if (irq_handler) {
- irq_handler();
- }
- }
- /* Compare match interrupt */
- if (__HAL_LPTIM_GET_FLAG(&LptimHandle, LPTIM_FLAG_CMPM) != RESET) {
- if (__HAL_LPTIM_GET_IT_SOURCE(&LptimHandle, LPTIM_IT_CMPM) != RESET) {
- /* Clear Compare match flag */
- __HAL_LPTIM_CLEAR_FLAG(&LptimHandle, LPTIM_FLAG_CMPM);
- if (irq_handler) {
- irq_handler();
- }
- }
- }
- #if !(TARGET_STM32L4)
- __HAL_LPTIM_WAKEUPTIMER_EXTI_CLEAR_FLAG();
- #endif
- }
- uint32_t lp_ticker_read(void)
- {
- uint32_t lp_time = LPTIM1->CNT;
- /* Reading the LPTIM_CNT register may return unreliable values.
- It is necessary to perform two consecutive read accesses and verify that the two returned values are identical */
- while (lp_time != LPTIM1->CNT) {
- lp_time = LPTIM1->CNT;
- }
- return lp_time;
- }
- void lp_ticker_set_interrupt(timestamp_t timestamp)
- {
- LptimHandle.Instance = LPTIM1;
- irq_handler = (void (*)(void))lp_ticker_irq_handler;
- /* CMPOK is set by hardware to inform application that the APB bus write operation to the LPTIM_CMP register has been successfully completed */
- /* Any successive write before the CMPOK flag be set, will lead to unpredictable results */
- while (__HAL_LPTIM_GET_FLAG(&LptimHandle, LPTIM_FLAG_CMPOK) == RESET) {
- }
- __HAL_LPTIM_CLEAR_FLAG(&LptimHandle, LPTIM_FLAG_CMPOK);
- __HAL_LPTIM_CLEAR_FLAG(&LptimHandle, LPTIM_FLAG_CMPM);
- __HAL_LPTIM_COMPARE_SET(&LptimHandle, timestamp);
- NVIC_EnableIRQ(LPTIM1_IRQn);
- }
- void lp_ticker_fire_interrupt(void)
- {
- lp_Fired = 1;
- NVIC_SetPendingIRQ(LPTIM1_IRQn);
- NVIC_EnableIRQ(LPTIM1_IRQn);
- }
- void lp_ticker_disable_interrupt(void)
- {
- NVIC_DisableIRQ(LPTIM1_IRQn);
- LptimHandle.Instance = LPTIM1;
- /* Waiting last write operation completion */
- while (__HAL_LPTIM_GET_FLAG(&LptimHandle, LPTIM_FLAG_CMPOK) == RESET) {
- }
- }
- void lp_ticker_clear_interrupt(void)
- {
- LptimHandle.Instance = LPTIM1;
- __HAL_LPTIM_CLEAR_FLAG(&LptimHandle, LPTIM_FLAG_CMPM);
- NVIC_ClearPendingIRQ(LPTIM1_IRQn);
- }
- /*****************************************************************/
- /* lpticker_lptim config is 0 or not defined in json config file */
- /* LPTICKER is based on RTC wake up feature from ST drivers */
- #else /* MBED_CONF_TARGET_LPTICKER_LPTIM */
- #include "rtc_api_hal.h"
- const ticker_info_t *lp_ticker_get_info()
- {
- static const ticker_info_t info = {
- RTC_CLOCK / 4, // RTC_WAKEUPCLOCK_RTCCLK_DIV4
- 32
- };
- return &info;
- }
- void lp_ticker_init(void)
- {
- rtc_init();
- lp_ticker_disable_interrupt();
- }
- uint32_t lp_ticker_read(void)
- {
- return rtc_read_lp();
- }
- void lp_ticker_set_interrupt(timestamp_t timestamp)
- {
- lp_ticker_disable_interrupt();
- rtc_set_wake_up_timer(timestamp);
- }
- void lp_ticker_fire_interrupt(void)
- {
- rtc_fire_interrupt();
- }
- void lp_ticker_disable_interrupt(void)
- {
- rtc_deactivate_wake_up_timer();
- }
- void lp_ticker_clear_interrupt(void)
- {
- NVIC_DisableIRQ(RTC_WKUP_IRQn);
- }
- #endif /* MBED_CONF_TARGET_LPTICKER_LPTIM */
- #endif /* DEVICE_LPTICKER */
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