mirror of https://github.com/ARMmbed/mbed-os.git
115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2016 ARM Limited
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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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#include "hal_tick.h"
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// A 16-bit timer is used
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#if TIM_MST_16BIT
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extern TIM_HandleTypeDef TimMasterHandle;
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volatile uint32_t PreviousVal = 0;
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void us_ticker_irq_handler(void);
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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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// Channel 1 used for mbed timeout
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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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// Channel 1 for mbed timeout
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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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// Overwrite the default ST HAL function (defined as "weak") in order to configure an HW timer
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// used for mbed timeouts only (not used for the Systick configuration).
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// Additional notes:
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// - The default ST HAL_InitTick function initializes the Systick to 1 ms and this is not correct for mbed
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// as the mbed Systick as to be configured to 1 us instead.
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// - Furthermore the Systick is configured by mbed RTOS directly.
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HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
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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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TIM_MST_RESET_ON;
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TIM_MST_RESET_OFF;
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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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return HAL_OK;
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}
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#endif // TIM_MST_16BIT
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