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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_NUCLEO_L073RZ/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:
494:41cd0bfadcd0 
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 494:41cd0bfadcd0 1 /**
mbed_official 494:41cd0bfadcd0 2 ******************************************************************************
mbed_official 494:41cd0bfadcd0 3 * @file hal_tick.c
mbed_official 494:41cd0bfadcd0 4 * @author MCD Application Team
mbed_official 494:41cd0bfadcd0 5 * @brief Initialization of HAL tick
mbed_official 494:41cd0bfadcd0 6 ******************************************************************************
mbed_official 494:41cd0bfadcd0 7 * @attention
mbed_official 494:41cd0bfadcd0 8 *
mbed_official 494:41cd0bfadcd0 9 * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
mbed_official 494:41cd0bfadcd0 10 *
mbed_official 494:41cd0bfadcd0 11 * Redistribution and use in source and binary forms, with or without modification,
mbed_official 494:41cd0bfadcd0 12 * are permitted provided that the following conditions are met:
mbed_official 494:41cd0bfadcd0 13 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 494:41cd0bfadcd0 14 * this list of conditions and the following disclaimer.
mbed_official 494:41cd0bfadcd0 15 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 494:41cd0bfadcd0 16 * this list of conditions and the following disclaimer in the documentation
mbed_official 494:41cd0bfadcd0 17 * and/or other materials provided with the distribution.
mbed_official 494:41cd0bfadcd0 18 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 494:41cd0bfadcd0 19 * may be used to endorse or promote products derived from this software
mbed_official 494:41cd0bfadcd0 20 * without specific prior written permission.
mbed_official 494:41cd0bfadcd0 21 *
mbed_official 494:41cd0bfadcd0 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 494:41cd0bfadcd0 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 494:41cd0bfadcd0 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 494:41cd0bfadcd0 25 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 494:41cd0bfadcd0 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 494:41cd0bfadcd0 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 494:41cd0bfadcd0 28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 494:41cd0bfadcd0 29 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 494:41cd0bfadcd0 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 494:41cd0bfadcd0 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 494:41cd0bfadcd0 32 *
mbed_official 494:41cd0bfadcd0 33 ******************************************************************************
mbed_official 494:41cd0bfadcd0 34 */
mbed_official 494:41cd0bfadcd0 35 #include "hal_tick.h"
mbed_official 494:41cd0bfadcd0 36
mbed_official 494:41cd0bfadcd0 37 TIM_HandleTypeDef TimMasterHandle;
mbed_official 494:41cd0bfadcd0 38 uint32_t PreviousVal = 0;
mbed_official 494:41cd0bfadcd0 39
mbed_official 494:41cd0bfadcd0 40 void us_ticker_irq_handler(void);
mbed_official 494:41cd0bfadcd0 41 void set_compare(uint16_t count);
mbed_official 494:41cd0bfadcd0 42
mbed_official 494:41cd0bfadcd0 43 extern volatile uint32_t SlaveCounter;
mbed_official 494:41cd0bfadcd0 44 extern volatile uint32_t oc_int_part;
mbed_official 494:41cd0bfadcd0 45 extern volatile uint16_t oc_rem_part;
mbed_official 494:41cd0bfadcd0 46
mbed_official 494:41cd0bfadcd0 47 void timer_irq_handler(void) {
mbed_official 494:41cd0bfadcd0 48 uint16_t cval = TIM_MST->CNT;
mbed_official 494:41cd0bfadcd0 49
mbed_official 494:41cd0bfadcd0 50 TimMasterHandle.Instance = TIM_MST;
mbed_official 494:41cd0bfadcd0 51
mbed_official 494:41cd0bfadcd0 52 // Clear Update interrupt flag
mbed_official 494:41cd0bfadcd0 53 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
mbed_official 494:41cd0bfadcd0 54 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE);
mbed_official 494:41cd0bfadcd0 55 SlaveCounter++;
mbed_official 494:41cd0bfadcd0 56 }
mbed_official 494:41cd0bfadcd0 57
mbed_official 494:41cd0bfadcd0 58 // Channel 1 for mbed timeout
mbed_official 494:41cd0bfadcd0 59 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
mbed_official 494:41cd0bfadcd0 60 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
mbed_official 494:41cd0bfadcd0 61 if (oc_rem_part > 0) {
mbed_official 494:41cd0bfadcd0 62 set_compare(oc_rem_part); // Finish the remaining time left
mbed_official 494:41cd0bfadcd0 63 oc_rem_part = 0;
mbed_official 494:41cd0bfadcd0 64 } else {
mbed_official 494:41cd0bfadcd0 65 if (oc_int_part > 0) {
mbed_official 494:41cd0bfadcd0 66 set_compare(0xFFFF);
mbed_official 494:41cd0bfadcd0 67 oc_rem_part = cval; // To finish the counter loop the next time
mbed_official 494:41cd0bfadcd0 68 oc_int_part--;
mbed_official 494:41cd0bfadcd0 69 } else {
mbed_official 494:41cd0bfadcd0 70 us_ticker_irq_handler();
mbed_official 494:41cd0bfadcd0 71 }
mbed_official 494:41cd0bfadcd0 72 }
mbed_official 494:41cd0bfadcd0 73 }
mbed_official 494:41cd0bfadcd0 74
mbed_official 494:41cd0bfadcd0 75 // Channel 2 for HAL tick
mbed_official 494:41cd0bfadcd0 76 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC2) == SET) {
mbed_official 494:41cd0bfadcd0 77 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC2);
mbed_official 494:41cd0bfadcd0 78 uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
mbed_official 494:41cd0bfadcd0 79 if ((val - PreviousVal) >= HAL_TICK_DELAY) {
mbed_official 494:41cd0bfadcd0 80 // Increment HAL variable
mbed_official 494:41cd0bfadcd0 81 HAL_IncTick();
mbed_official 494:41cd0bfadcd0 82 // Prepare next interrupt
mbed_official 494:41cd0bfadcd0 83 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
mbed_official 494:41cd0bfadcd0 84 PreviousVal = val;
mbed_official 494:41cd0bfadcd0 85 }
mbed_official 494:41cd0bfadcd0 86 }
mbed_official 494:41cd0bfadcd0 87 }
mbed_official 494:41cd0bfadcd0 88
mbed_official 494:41cd0bfadcd0 89 // Reconfigure the HAL tick using a standard timer instead of systick.
mbed_official 494:41cd0bfadcd0 90 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
mbed_official 494:41cd0bfadcd0 91 // Enable timer clock
mbed_official 494:41cd0bfadcd0 92 TIM_MST_RCC;
mbed_official 494:41cd0bfadcd0 93
mbed_official 494:41cd0bfadcd0 94 // Reset timer
mbed_official 494:41cd0bfadcd0 95 TIM_MST_RESET_ON;
mbed_official 494:41cd0bfadcd0 96 TIM_MST_RESET_OFF;
mbed_official 494:41cd0bfadcd0 97
mbed_official 494:41cd0bfadcd0 98 // Update the SystemCoreClock variable
mbed_official 494:41cd0bfadcd0 99 SystemCoreClockUpdate();
mbed_official 494:41cd0bfadcd0 100
mbed_official 494:41cd0bfadcd0 101 // Configure time base
mbed_official 494:41cd0bfadcd0 102 TimMasterHandle.Instance = TIM_MST;
mbed_official 494:41cd0bfadcd0 103 TimMasterHandle.Init.Period = 0xFFFFFFFF;
mbed_official 494:41cd0bfadcd0 104 TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
mbed_official 494:41cd0bfadcd0 105 TimMasterHandle.Init.ClockDivision = 0;
mbed_official 494:41cd0bfadcd0 106 TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
mbed_official 494:41cd0bfadcd0 107 HAL_TIM_Base_Init(&TimMasterHandle);
mbed_official 494:41cd0bfadcd0 108
mbed_official 494:41cd0bfadcd0 109 // Configure output compare channel 1 for mbed timeout (enabled later when used)
mbed_official 494:41cd0bfadcd0 110 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
mbed_official 494:41cd0bfadcd0 111
mbed_official 494:41cd0bfadcd0 112 // Configure output compare channel 2 for HAL tick
mbed_official 494:41cd0bfadcd0 113 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
mbed_official 494:41cd0bfadcd0 114 PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
mbed_official 494:41cd0bfadcd0 115 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
mbed_official 494:41cd0bfadcd0 116
mbed_official 494:41cd0bfadcd0 117 // Configure interrupts
mbed_official 494:41cd0bfadcd0 118 // Update interrupt used for 32-bit counter
mbed_official 494:41cd0bfadcd0 119 // Output compare channel 1 interrupt for mbed timeout
mbed_official 494:41cd0bfadcd0 120 // Output compare channel 2 interrupt for HAL tick
mbed_official 494:41cd0bfadcd0 121 NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
mbed_official 494:41cd0bfadcd0 122 NVIC_EnableIRQ(TIM_MST_IRQ);
mbed_official 494:41cd0bfadcd0 123
mbed_official 494:41cd0bfadcd0 124 // Enable interrupts
mbed_official 494:41cd0bfadcd0 125 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_UPDATE); // For 32-bit counter
mbed_official 494:41cd0bfadcd0 126 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2); // For HAL tick
mbed_official 494:41cd0bfadcd0 127
mbed_official 494:41cd0bfadcd0 128 // Enable timer
mbed_official 494:41cd0bfadcd0 129 HAL_TIM_Base_Start(&TimMasterHandle);
mbed_official 494:41cd0bfadcd0 130
mbed_official 494:41cd0bfadcd0 131 return HAL_OK;
mbed_official 494:41cd0bfadcd0 132 }
mbed_official 494:41cd0bfadcd0 133
mbed_official 494:41cd0bfadcd0 134 /**
mbed_official 494:41cd0bfadcd0 135 * @}
mbed_official 494:41cd0bfadcd0 136 */
mbed_official 494:41cd0bfadcd0 137
mbed_official 494:41cd0bfadcd0 138 /**
mbed_official 494:41cd0bfadcd0 139 * @}
mbed_official 494:41cd0bfadcd0 140 */
mbed_official 494:41cd0bfadcd0 141
mbed_official 494:41cd0bfadcd0 142 /**
mbed_official 494:41cd0bfadcd0 143 * @}
mbed_official 494:41cd0bfadcd0 144 */
mbed_official 494:41cd0bfadcd0 145 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/