mirror of https://github.com/ARMmbed/mbed-os.git
281 lines
8.0 KiB
C
281 lines
8.0 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2018 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#if DEVICE_USTICKER
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#include <stddef.h>
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#include "us_ticker_api.h"
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#include "PeripheralNames.h"
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#include "us_ticker_data.h"
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#include "us_ticker_defines.h"
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TIM_HandleTypeDef TimMasterHandle;
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uint32_t timer_cnt_reg;
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uint32_t timer_ccr1_reg;
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uint32_t timer_dier_reg;
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const ticker_info_t *us_ticker_get_info()
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{
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static const ticker_info_t info = {
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1000000,
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TIM_MST_BIT_WIDTH
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};
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return &info;
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}
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void us_ticker_irq_handler(void);
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// ************************************ 16-bit timer ************************************
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#if TIM_MST_BIT_WIDTH == 16
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#if defined(TARGET_STM32F0)
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void timer_update_irq_handler(void)
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{
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#else
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void timer_irq_handler(void)
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{
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#endif
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TimMasterHandle.Instance = TIM_MST;
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#if defined(TARGET_STM32F0)
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} // end timer_update_irq_handler function
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void timer_oc_irq_handler(void)
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{
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TimMasterHandle.Instance = TIM_MST;
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#endif
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if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
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if (__HAL_TIM_GET_IT_SOURCE(&TimMasterHandle, TIM_IT_CC1) == SET) {
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__HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
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us_ticker_irq_handler();
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}
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}
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}
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void init_16bit_timer(void)
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{
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// Enable timer clock
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TIM_MST_RCC;
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// Reset timer
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#if defined(DUAL_CORE)
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while (LL_HSEM_1StepLock(HSEM, CFG_HW_RCC_SEMID)) {
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}
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#endif /* DUAL_CORE */
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TIM_MST_RESET_ON;
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TIM_MST_RESET_OFF;
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#if defined(DUAL_CORE)
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LL_HSEM_ReleaseLock(HSEM, CFG_HW_RCC_SEMID, HSEM_CR_COREID_CURRENT);
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#endif /* DUAL_CORE */
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// Update the SystemCoreClock variable
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SystemCoreClockUpdate();
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// Configure time base
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TimMasterHandle.Instance = TIM_MST;
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TimMasterHandle.Init.Period = 0xFFFF;
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TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
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TimMasterHandle.Init.ClockDivision = 0;
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TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
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#if !defined(TARGET_STM32L0) && !defined(TARGET_STM32L1)
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TimMasterHandle.Init.RepetitionCounter = 0;
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#endif
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#ifdef TIM_AUTORELOAD_PRELOAD_DISABLE
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TimMasterHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
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#endif
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HAL_TIM_Base_Init(&TimMasterHandle);
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// Configure output compare channel 1 for mbed timeout (enabled later when used)
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HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
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// Output compare channel 1 interrupt for mbed timeout
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#if defined(TARGET_STM32F0)
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NVIC_SetVector(TIM_MST_UP_IRQ, (uint32_t)timer_update_irq_handler);
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NVIC_EnableIRQ(TIM_MST_UP_IRQ);
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NVIC_SetPriority(TIM_MST_UP_IRQ, 0);
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NVIC_SetVector(TIM_MST_OC_IRQ, (uint32_t)timer_oc_irq_handler);
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NVIC_EnableIRQ(TIM_MST_OC_IRQ);
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NVIC_SetPriority(TIM_MST_OC_IRQ, 1);
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#else
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NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
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NVIC_EnableIRQ(TIM_MST_IRQ);
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#endif
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// Enable timer
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HAL_TIM_Base_Start(&TimMasterHandle);
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// Freeze timer on stop/breakpoint
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// Define the FREEZE_TIMER_ON_DEBUG macro in mbed_app.json for example
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#if !defined(NDEBUG) && defined(FREEZE_TIMER_ON_DEBUG) && defined(TIM_MST_DBGMCU_FREEZE)
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TIM_MST_DBGMCU_FREEZE;
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#endif
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__HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
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}
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// ************************************ 32-bit timer ************************************
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#else
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void timer_irq_handler(void)
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{
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TimMasterHandle.Instance = TIM_MST;
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if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
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if (__HAL_TIM_GET_IT_SOURCE(&TimMasterHandle, TIM_IT_CC1) == SET) {
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__HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
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us_ticker_irq_handler();
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}
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}
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}
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void init_32bit_timer(void)
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{
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RCC_ClkInitTypeDef RCC_ClkInitStruct;
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uint32_t PclkFreq;
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// Get clock configuration
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// Note: PclkFreq contains here the Latency (not used after)
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HAL_RCC_GetClockConfig(&RCC_ClkInitStruct, &PclkFreq);
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// Get timer clock value
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#if TIM_MST_PCLK == 1
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PclkFreq = HAL_RCC_GetPCLK1Freq();
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#else
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PclkFreq = HAL_RCC_GetPCLK2Freq();
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#endif
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// Enable timer clock
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TIM_MST_RCC;
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// Reset timer
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#if defined(DUAL_CORE)
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while (LL_HSEM_1StepLock(HSEM, CFG_HW_RCC_SEMID)) {
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}
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#endif /* DUAL_CORE */
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TIM_MST_RESET_ON;
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TIM_MST_RESET_OFF;
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#if defined(DUAL_CORE)
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LL_HSEM_ReleaseLock(HSEM, CFG_HW_RCC_SEMID, HSEM_CR_COREID_CURRENT);
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#endif /* DUAL_CORE */
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// Configure time base
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TimMasterHandle.Instance = TIM_MST;
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TimMasterHandle.Init.Period = 0xFFFFFFFF;
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// TIMxCLK = PCLKx when the APB prescaler = 1 else TIMxCLK = 2 * PCLKx
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#if TIM_MST_PCLK == 1
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if (RCC_ClkInitStruct.APB1CLKDivider == RCC_HCLK_DIV1) {
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#else
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if (RCC_ClkInitStruct.APB2CLKDivider == RCC_HCLK_DIV1) {
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#endif
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TimMasterHandle.Init.Prescaler = (uint16_t)((PclkFreq) / 1000000) - 1; // 1 us tick
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} else {
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TimMasterHandle.Init.Prescaler = (uint16_t)((PclkFreq * 2) / 1000000) - 1; // 1 us tick
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}
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TimMasterHandle.Init.ClockDivision = 0;
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TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
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#if !TARGET_STM32L1
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TimMasterHandle.Init.RepetitionCounter = 0;
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#endif
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#ifdef TIM_AUTORELOAD_PRELOAD_DISABLE
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TimMasterHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
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#endif
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HAL_TIM_OC_Init(&TimMasterHandle);
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NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
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NVIC_EnableIRQ(TIM_MST_IRQ);
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// Channel 1 for mbed timeout
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HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
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// Freeze timer on stop/breakpoint
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// Define the FREEZE_TIMER_ON_DEBUG macro in mbed_app.json for example
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#if !defined(NDEBUG) && defined(FREEZE_TIMER_ON_DEBUG) && defined(TIM_MST_DBGMCU_FREEZE)
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TIM_MST_DBGMCU_FREEZE;
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#endif
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__HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
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}
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#endif // 16-bit/32-bit timer
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void us_ticker_init(void)
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{
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// Timer is already initialized in HAL_InitTick()
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__HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
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HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
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}
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uint32_t (us_ticker_read)()
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{
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/* Invoke the macro */
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return us_ticker_read();
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}
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void us_ticker_set_interrupt(timestamp_t timestamp)
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{
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// NOTE: This function must be called with interrupts disabled to keep our
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// timer interrupt setup atomic
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// Set new output compare value
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__HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp);
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// Ensure the compare event starts clear
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__HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
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// Enable IT
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__HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
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}
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void us_ticker_fire_interrupt(void)
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{
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__HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
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LL_TIM_GenerateEvent_CC1(TimMasterHandle.Instance);
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__HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
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}
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void us_ticker_disable_interrupt(void)
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{
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__HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
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}
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/* NOTE: must be called with interrupts disabled! */
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void us_ticker_clear_interrupt(void)
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{
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__HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
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}
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void save_timer_ctx(void)
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{
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timer_cnt_reg = __HAL_TIM_GET_COUNTER(&TimMasterHandle);
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timer_ccr1_reg = __HAL_TIM_GET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1);
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timer_dier_reg = TIM_MST->DIER;
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}
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void restore_timer_ctx(void)
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{
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__HAL_TIM_SET_COUNTER(&TimMasterHandle, timer_cnt_reg);
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__HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1, timer_ccr1_reg);
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TIM_MST->DIER = timer_dier_reg;
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}
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void us_ticker_free(void)
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{
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HAL_TIM_OC_Stop(&TimMasterHandle, TIM_CHANNEL_1);
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us_ticker_disable_interrupt();
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}
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#endif /* DEVICE_USTICKER */
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