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targets/TARGET_STM/hal_tick_16b.c@186:707f6e361f3e, 2018-06-22 (annotated)

Committer:
Anna Bridge
Date:
Fri Jun 22 16:45:37 2018 +0100
Revision:
186:707f6e361f3e
Parent:
184:08ed48f1de7f 
mbed-dev library. Release version 162

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 153:fa9ff456f731 1 /* mbed Microcontroller Library
<> 153:fa9ff456f731 2 * Copyright (c) 2006-2016 ARM Limited
<> 153:fa9ff456f731 3 *
<> 153:fa9ff456f731 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 153:fa9ff456f731 5 * you may not use this file except in compliance with the License.
<> 153:fa9ff456f731 6 * You may obtain a copy of the License at
<> 153:fa9ff456f731 7 *
<> 153:fa9ff456f731 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 153:fa9ff456f731 9 *
<> 153:fa9ff456f731 10 * Unless required by applicable law or agreed to in writing, software
<> 153:fa9ff456f731 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 153:fa9ff456f731 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 153:fa9ff456f731 13 * See the License for the specific language governing permissions and
<> 153:fa9ff456f731 14 * limitations under the License.
<> 153:fa9ff456f731 15 */
<> 153:fa9ff456f731 16 #include "hal_tick.h"
<> 153:fa9ff456f731 17
<> 153:fa9ff456f731 18 // A 16-bit timer is used
<> 153:fa9ff456f731 19 #if TIM_MST_16BIT
<> 153:fa9ff456f731 20
<> 153:fa9ff456f731 21 extern TIM_HandleTypeDef TimMasterHandle;
<> 153:fa9ff456f731 22
<> 153:fa9ff456f731 23 volatile uint32_t PreviousVal = 0;
<> 153:fa9ff456f731 24
<> 153:fa9ff456f731 25 void us_ticker_irq_handler(void);
<> 153:fa9ff456f731 26
<> 153:fa9ff456f731 27 #if defined(TARGET_STM32F0)
<> 153:fa9ff456f731 28 void timer_update_irq_handler(void) {
<> 153:fa9ff456f731 29 #else
<> 153:fa9ff456f731 30 void timer_irq_handler(void)
<> 153:fa9ff456f731 31 {
<> 153:fa9ff456f731 32 #endif
<> 153:fa9ff456f731 33 TimMasterHandle.Instance = TIM_MST;
<> 153:fa9ff456f731 34
<> 153:fa9ff456f731 35 #if defined(TARGET_STM32F0)
<> 153:fa9ff456f731 36 } // end timer_update_irq_handler function
<> 153:fa9ff456f731 37 // Used for mbed timeout (channel 1) and HAL tick (channel 2)
<> 153:fa9ff456f731 38 void timer_oc_irq_handler(void)
<> 153:fa9ff456f731 39 {
<> 153:fa9ff456f731 40 TimMasterHandle.Instance = TIM_MST;
<> 153:fa9ff456f731 41 #endif
<> 153:fa9ff456f731 42
<> 153:fa9ff456f731 43 // Channel 1 for mbed timeout
<> 153:fa9ff456f731 44 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
<> 153:fa9ff456f731 45 if (__HAL_TIM_GET_IT_SOURCE(&TimMasterHandle, TIM_IT_CC1) == SET) {
<> 153:fa9ff456f731 46 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
AnnaBridge 167:e84263d55307 47 us_ticker_irq_handler();
<> 153:fa9ff456f731 48 }
<> 153:fa9ff456f731 49 }
<> 153:fa9ff456f731 50 }
<> 153:fa9ff456f731 51
<> 153:fa9ff456f731 52 // Reconfigure the HAL tick using a standard timer instead of systick.
<> 153:fa9ff456f731 53 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
<> 153:fa9ff456f731 54 {
<> 153:fa9ff456f731 55 // Enable timer clock
<> 153:fa9ff456f731 56 TIM_MST_RCC;
<> 153:fa9ff456f731 57
<> 153:fa9ff456f731 58 // Reset timer
<> 153:fa9ff456f731 59 TIM_MST_RESET_ON;
<> 153:fa9ff456f731 60 TIM_MST_RESET_OFF;
<> 153:fa9ff456f731 61
<> 153:fa9ff456f731 62 // Update the SystemCoreClock variable
<> 153:fa9ff456f731 63 SystemCoreClockUpdate();
<> 153:fa9ff456f731 64
<> 153:fa9ff456f731 65 // Configure time base
<> 153:fa9ff456f731 66 TimMasterHandle.Instance = TIM_MST;
<> 153:fa9ff456f731 67 TimMasterHandle.Init.Period = 0xFFFF;
<> 153:fa9ff456f731 68 TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
<> 153:fa9ff456f731 69 TimMasterHandle.Init.ClockDivision = 0;
<> 153:fa9ff456f731 70 TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
AnnaBridge 184:08ed48f1de7f 71 #if !defined(TARGET_STM32L0) && !defined(TARGET_STM32L1)
AnnaBridge 167:e84263d55307 72 TimMasterHandle.Init.RepetitionCounter = 0;
AnnaBridge 167:e84263d55307 73 #endif
AnnaBridge 167:e84263d55307 74 #ifdef TIM_AUTORELOAD_PRELOAD_DISABLE
<> 156:95d6b41a828b 75 TimMasterHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
<> 156:95d6b41a828b 76 #endif
<> 153:fa9ff456f731 77 HAL_TIM_Base_Init(&TimMasterHandle);
<> 153:fa9ff456f731 78
<> 153:fa9ff456f731 79 // Configure output compare channel 1 for mbed timeout (enabled later when used)
<> 153:fa9ff456f731 80 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
<> 153:fa9ff456f731 81
<> 153:fa9ff456f731 82 // Output compare channel 1 interrupt for mbed timeout
<> 153:fa9ff456f731 83 #if defined(TARGET_STM32F0)
<> 153:fa9ff456f731 84 NVIC_SetVector(TIM_MST_UP_IRQ, (uint32_t)timer_update_irq_handler);
<> 153:fa9ff456f731 85 NVIC_EnableIRQ(TIM_MST_UP_IRQ);
<> 153:fa9ff456f731 86 NVIC_SetPriority(TIM_MST_UP_IRQ, 0);
<> 153:fa9ff456f731 87 NVIC_SetVector(TIM_MST_OC_IRQ, (uint32_t)timer_oc_irq_handler);
<> 153:fa9ff456f731 88 NVIC_EnableIRQ(TIM_MST_OC_IRQ);
<> 153:fa9ff456f731 89 NVIC_SetPriority(TIM_MST_OC_IRQ, 1);
<> 153:fa9ff456f731 90 #else
<> 153:fa9ff456f731 91 NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
<> 153:fa9ff456f731 92 NVIC_EnableIRQ(TIM_MST_IRQ);
<> 153:fa9ff456f731 93 #endif
<> 153:fa9ff456f731 94
<> 153:fa9ff456f731 95 // Enable timer
<> 153:fa9ff456f731 96 HAL_TIM_Base_Start(&TimMasterHandle);
<> 153:fa9ff456f731 97
AnnaBridge 173:e131a1973e81 98 // Freeze timer on stop/breakpoint
AnnaBridge 175:af195413fb11 99 // Define the FREEZE_TIMER_ON_DEBUG macro in mbed_app.json for example
AnnaBridge 175:af195413fb11 100 #if !defined(NDEBUG) && defined(FREEZE_TIMER_ON_DEBUG) && defined(TIM_MST_DBGMCU_FREEZE)
AnnaBridge 173:e131a1973e81 101 TIM_MST_DBGMCU_FREEZE;
AnnaBridge 173:e131a1973e81 102 #endif
AnnaBridge 173:e131a1973e81 103
<> 153:fa9ff456f731 104 return HAL_OK;
<> 153:fa9ff456f731 105 }
<> 153:fa9ff456f731 106
<> 153:fa9ff456f731 107 #endif // TIM_MST_16BIT