mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_STM/hal_tick_32b.c@186:707f6e361f3e, 2018-06-22 (annotated)

Committer:
Anna Bridge
Date:
Fri Jun 22 16:45:37 2018 +0100
Revision:
186:707f6e361f3e
Parent:
180:96ed750bd169 
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 32-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 void timer_irq_handler(void)
<> 153:fa9ff456f731 28 {
<> 153:fa9ff456f731 29 // Channel 1 for mbed timeout
<> 153:fa9ff456f731 30 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
<> 153:fa9ff456f731 31 if (__HAL_TIM_GET_IT_SOURCE(&TimMasterHandle, TIM_IT_CC1) == SET) {
<> 153:fa9ff456f731 32 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
<> 153:fa9ff456f731 33 us_ticker_irq_handler();
<> 153:fa9ff456f731 34 }
<> 153:fa9ff456f731 35 }
<> 153:fa9ff456f731 36 }
<> 153:fa9ff456f731 37
<> 153:fa9ff456f731 38 // Reconfigure the HAL tick using a standard timer instead of systick.
<> 153:fa9ff456f731 39 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
<> 153:fa9ff456f731 40 {
<> 153:fa9ff456f731 41 RCC_ClkInitTypeDef RCC_ClkInitStruct;
<> 153:fa9ff456f731 42 uint32_t PclkFreq;
<> 153:fa9ff456f731 43
<> 153:fa9ff456f731 44 // Get clock configuration
<> 153:fa9ff456f731 45 // Note: PclkFreq contains here the Latency (not used after)
<> 153:fa9ff456f731 46 HAL_RCC_GetClockConfig(&RCC_ClkInitStruct, &PclkFreq);
<> 153:fa9ff456f731 47
<> 153:fa9ff456f731 48 // Get timer clock value
<> 153:fa9ff456f731 49 #if TIM_MST_PCLK == 1
<> 153:fa9ff456f731 50 PclkFreq = HAL_RCC_GetPCLK1Freq();
<> 153:fa9ff456f731 51 #else
<> 153:fa9ff456f731 52 PclkFreq = HAL_RCC_GetPCLK2Freq();
<> 153:fa9ff456f731 53 #endif
<> 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 // Configure time base
<> 153:fa9ff456f731 63 TimMasterHandle.Instance = TIM_MST;
<> 153:fa9ff456f731 64 TimMasterHandle.Init.Period = 0xFFFFFFFF;
<> 153:fa9ff456f731 65
<> 153:fa9ff456f731 66 // TIMxCLK = PCLKx when the APB prescaler = 1 else TIMxCLK = 2 * PCLKx
<> 153:fa9ff456f731 67 #if TIM_MST_PCLK == 1
<> 153:fa9ff456f731 68 if (RCC_ClkInitStruct.APB1CLKDivider == RCC_HCLK_DIV1) {
<> 153:fa9ff456f731 69 #else
<> 153:fa9ff456f731 70 if (RCC_ClkInitStruct.APB2CLKDivider == RCC_HCLK_DIV1) {
<> 153:fa9ff456f731 71 #endif
<> 153:fa9ff456f731 72 TimMasterHandle.Init.Prescaler = (uint16_t)((PclkFreq) / 1000000) - 1; // 1 us tick
<> 160:d5399cc887bb 73 } else {
<> 153:fa9ff456f731 74 TimMasterHandle.Init.Prescaler = (uint16_t)((PclkFreq * 2) / 1000000) - 1; // 1 us tick
<> 153:fa9ff456f731 75 }
<> 153:fa9ff456f731 76
<> 153:fa9ff456f731 77 TimMasterHandle.Init.ClockDivision = 0;
<> 153:fa9ff456f731 78 TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
<> 153:fa9ff456f731 79 #if !TARGET_STM32L1
<> 153:fa9ff456f731 80 TimMasterHandle.Init.RepetitionCounter = 0;
<> 153:fa9ff456f731 81 #endif
AnnaBridge 167:e84263d55307 82 #ifdef TIM_AUTORELOAD_PRELOAD_DISABLE
<> 156:95d6b41a828b 83 TimMasterHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
<> 156:95d6b41a828b 84 #endif
<> 153:fa9ff456f731 85 HAL_TIM_OC_Init(&TimMasterHandle);
<> 153:fa9ff456f731 86
<> 153:fa9ff456f731 87 NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
<> 153:fa9ff456f731 88 NVIC_EnableIRQ(TIM_MST_IRQ);
<> 153:fa9ff456f731 89
<> 153:fa9ff456f731 90 // Channel 1 for mbed timeout
<> 153:fa9ff456f731 91 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
<> 153:fa9ff456f731 92
AnnaBridge 173:e131a1973e81 93 // Freeze timer on stop/breakpoint
AnnaBridge 175:af195413fb11 94 // Define the FREEZE_TIMER_ON_DEBUG macro in mbed_app.json for example
AnnaBridge 175:af195413fb11 95 #if !defined(NDEBUG) && defined(FREEZE_TIMER_ON_DEBUG) && defined(TIM_MST_DBGMCU_FREEZE)
AnnaBridge 173:e131a1973e81 96 TIM_MST_DBGMCU_FREEZE;
AnnaBridge 173:e131a1973e81 97 #endif
AnnaBridge 173:e131a1973e81 98
<> 153:fa9ff456f731 99 return HAL_OK;
<> 153:fa9ff456f731 100 }
<> 153:fa9ff456f731 101
<> 153:fa9ff456f731 102 #endif // !TIM_MST_16BIT