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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/cmsis/TARGET_STM/TARGET_STM32L0/TARGET_DISCO_L053C8/hal_tick.c@579:53297373a894, 2015-07-01 (annotated)

Committer:
mbed_official
Date:
Wed Jul 01 09:45:11 2015 +0100
Revision:
579:53297373a894
Parent:
439:c4382fcbbaed 
Synchronized with git revision d5b4d2ab9c47edb4dc5776e7177b0c2263459081



Full URL: https://github.com/mbedmicro/mbed/commit/d5b4d2ab9c47edb4dc5776e7177b0c2263459081/



Initial version of drivers for SAMR21

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 439:c4382fcbbaed 1 /**
mbed_official 439:c4382fcbbaed 2 ******************************************************************************
mbed_official 439:c4382fcbbaed 3 * @file hal_tick.c
mbed_official 439:c4382fcbbaed 4 * @author MCD Application Team
mbed_official 439:c4382fcbbaed 5 * @brief Initialization of HAL tick
mbed_official 439:c4382fcbbaed 6 ******************************************************************************
mbed_official 439:c4382fcbbaed 7 * @attention
mbed_official 439:c4382fcbbaed 8 *
mbed_official 439:c4382fcbbaed 9 * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
mbed_official 439:c4382fcbbaed 10 *
mbed_official 439:c4382fcbbaed 11 * Redistribution and use in source and binary forms, with or without modification,
mbed_official 439:c4382fcbbaed 12 * are permitted provided that the following conditions are met:
mbed_official 439:c4382fcbbaed 13 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 439:c4382fcbbaed 14 * this list of conditions and the following disclaimer.
mbed_official 439:c4382fcbbaed 15 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 439:c4382fcbbaed 16 * this list of conditions and the following disclaimer in the documentation
mbed_official 439:c4382fcbbaed 17 * and/or other materials provided with the distribution.
mbed_official 439:c4382fcbbaed 18 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 439:c4382fcbbaed 19 * may be used to endorse or promote products derived from this software
mbed_official 439:c4382fcbbaed 20 * without specific prior written permission.
mbed_official 439:c4382fcbbaed 21 *
mbed_official 439:c4382fcbbaed 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 439:c4382fcbbaed 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 439:c4382fcbbaed 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 439:c4382fcbbaed 25 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 439:c4382fcbbaed 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 439:c4382fcbbaed 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 439:c4382fcbbaed 28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 439:c4382fcbbaed 29 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 439:c4382fcbbaed 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 439:c4382fcbbaed 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 439:c4382fcbbaed 32 *
mbed_official 439:c4382fcbbaed 33 ******************************************************************************
mbed_official 439:c4382fcbbaed 34 */
mbed_official 439:c4382fcbbaed 35 #include "hal_tick.h"
mbed_official 439:c4382fcbbaed 36
mbed_official 439:c4382fcbbaed 37 TIM_HandleTypeDef TimMasterHandle;
mbed_official 439:c4382fcbbaed 38 uint32_t PreviousVal = 0;
mbed_official 439:c4382fcbbaed 39
mbed_official 439:c4382fcbbaed 40 void us_ticker_irq_handler(void);
mbed_official 439:c4382fcbbaed 41 void set_compare(uint16_t count);
mbed_official 439:c4382fcbbaed 42
mbed_official 439:c4382fcbbaed 43 extern volatile uint32_t SlaveCounter;
mbed_official 439:c4382fcbbaed 44 extern volatile uint32_t oc_int_part;
mbed_official 439:c4382fcbbaed 45 extern volatile uint16_t oc_rem_part;
mbed_official 439:c4382fcbbaed 46
mbed_official 439:c4382fcbbaed 47 void timer_irq_handler(void) {
mbed_official 439:c4382fcbbaed 48 uint16_t cval = TIM_MST->CNT;
mbed_official 439:c4382fcbbaed 49
mbed_official 439:c4382fcbbaed 50 TimMasterHandle.Instance = TIM_MST;
mbed_official 439:c4382fcbbaed 51
mbed_official 439:c4382fcbbaed 52 // Clear Update interrupt flag
mbed_official 439:c4382fcbbaed 53 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
mbed_official 439:c4382fcbbaed 54 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE);
mbed_official 439:c4382fcbbaed 55 SlaveCounter++;
mbed_official 439:c4382fcbbaed 56 }
mbed_official 439:c4382fcbbaed 57
mbed_official 439:c4382fcbbaed 58 // Channel 1 for mbed timeout
mbed_official 439:c4382fcbbaed 59 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
mbed_official 439:c4382fcbbaed 60 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
mbed_official 439:c4382fcbbaed 61 if (oc_rem_part > 0) {
mbed_official 439:c4382fcbbaed 62 set_compare(oc_rem_part); // Finish the remaining time left
mbed_official 439:c4382fcbbaed 63 oc_rem_part = 0;
mbed_official 439:c4382fcbbaed 64 } else {
mbed_official 439:c4382fcbbaed 65 if (oc_int_part > 0) {
mbed_official 439:c4382fcbbaed 66 set_compare(0xFFFF);
mbed_official 439:c4382fcbbaed 67 oc_rem_part = cval; // To finish the counter loop the next time
mbed_official 439:c4382fcbbaed 68 oc_int_part--;
mbed_official 439:c4382fcbbaed 69 } else {
mbed_official 439:c4382fcbbaed 70 us_ticker_irq_handler();
mbed_official 439:c4382fcbbaed 71 }
mbed_official 439:c4382fcbbaed 72 }
mbed_official 439:c4382fcbbaed 73 }
mbed_official 439:c4382fcbbaed 74
mbed_official 439:c4382fcbbaed 75 // Channel 2 for HAL tick
mbed_official 439:c4382fcbbaed 76 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC2) == SET) {
mbed_official 439:c4382fcbbaed 77 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC2);
mbed_official 439:c4382fcbbaed 78 uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
mbed_official 439:c4382fcbbaed 79 if ((val - PreviousVal) >= HAL_TICK_DELAY) {
mbed_official 439:c4382fcbbaed 80 // Increment HAL variable
mbed_official 439:c4382fcbbaed 81 HAL_IncTick();
mbed_official 439:c4382fcbbaed 82 // Prepare next interrupt
mbed_official 439:c4382fcbbaed 83 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
mbed_official 439:c4382fcbbaed 84 PreviousVal = val;
mbed_official 439:c4382fcbbaed 85 }
mbed_official 439:c4382fcbbaed 86 }
mbed_official 439:c4382fcbbaed 87 }
mbed_official 439:c4382fcbbaed 88
mbed_official 439:c4382fcbbaed 89 // Reconfigure the HAL tick using a standard timer instead of systick.
mbed_official 439:c4382fcbbaed 90 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
mbed_official 439:c4382fcbbaed 91 // Enable timer clock
mbed_official 439:c4382fcbbaed 92 TIM_MST_RCC;
mbed_official 439:c4382fcbbaed 93
mbed_official 439:c4382fcbbaed 94 // Reset timer
mbed_official 439:c4382fcbbaed 95 TIM_MST_RESET_ON;
mbed_official 439:c4382fcbbaed 96 TIM_MST_RESET_OFF;
mbed_official 439:c4382fcbbaed 97
mbed_official 439:c4382fcbbaed 98 // Update the SystemCoreClock variable
mbed_official 439:c4382fcbbaed 99 SystemCoreClockUpdate();
mbed_official 439:c4382fcbbaed 100
mbed_official 439:c4382fcbbaed 101 // Configure time base
mbed_official 439:c4382fcbbaed 102 TimMasterHandle.Instance = TIM_MST;
mbed_official 439:c4382fcbbaed 103 TimMasterHandle.Init.Period = 0xFFFFFFFF;
mbed_official 439:c4382fcbbaed 104 TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
mbed_official 439:c4382fcbbaed 105 TimMasterHandle.Init.ClockDivision = 0;
mbed_official 439:c4382fcbbaed 106 TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
mbed_official 439:c4382fcbbaed 107 HAL_TIM_Base_Init(&TimMasterHandle);
mbed_official 439:c4382fcbbaed 108
mbed_official 439:c4382fcbbaed 109 // Configure output compare channel 1 for mbed timeout (enabled later when used)
mbed_official 439:c4382fcbbaed 110 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
mbed_official 439:c4382fcbbaed 111
mbed_official 439:c4382fcbbaed 112 // Configure output compare channel 2 for HAL tick
mbed_official 439:c4382fcbbaed 113 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
mbed_official 439:c4382fcbbaed 114 PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
mbed_official 439:c4382fcbbaed 115 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
mbed_official 439:c4382fcbbaed 116
mbed_official 439:c4382fcbbaed 117 // Configure interrupts
mbed_official 439:c4382fcbbaed 118 // Update interrupt used for 32-bit counter
mbed_official 439:c4382fcbbaed 119 // Output compare channel 1 interrupt for mbed timeout
mbed_official 439:c4382fcbbaed 120 // Output compare channel 2 interrupt for HAL tick
mbed_official 439:c4382fcbbaed 121 NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
mbed_official 439:c4382fcbbaed 122 NVIC_EnableIRQ(TIM_MST_IRQ);
mbed_official 439:c4382fcbbaed 123
mbed_official 439:c4382fcbbaed 124 // Enable interrupts
mbed_official 439:c4382fcbbaed 125 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_UPDATE); // For 32-bit counter
mbed_official 439:c4382fcbbaed 126 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2); // For HAL tick
mbed_official 439:c4382fcbbaed 127
mbed_official 439:c4382fcbbaed 128 // Enable timer
mbed_official 439:c4382fcbbaed 129 HAL_TIM_Base_Start(&TimMasterHandle);
mbed_official 439:c4382fcbbaed 130
mbed_official 439:c4382fcbbaed 131 return HAL_OK;
mbed_official 439:c4382fcbbaed 132 }
mbed_official 439:c4382fcbbaed 133
mbed_official 439:c4382fcbbaed 134 /**
mbed_official 439:c4382fcbbaed 135 * @}
mbed_official 439:c4382fcbbaed 136 */
mbed_official 439:c4382fcbbaed 137
mbed_official 439:c4382fcbbaed 138 /**
mbed_official 439:c4382fcbbaed 139 * @}
mbed_official 439:c4382fcbbaed 140 */
mbed_official 439:c4382fcbbaed 141
mbed_official 439:c4382fcbbaed 142 /**
mbed_official 439:c4382fcbbaed 143 * @}
mbed_official 439:c4382fcbbaed 144 */
mbed_official 439:c4382fcbbaed 145 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/