Lancaster University / mbed-src

Lancaster University's (short term!) clone of mbed-src for micro:bit. This is a copy of the github branch https://github.com/lancaster-university/mbed-classic

Fork of mbed-src by mbed official

targets/cmsis/TARGET_STM/TARGET_STM32L4/TARGET_DISCO_L476VG/hal_tick.c@610:813dcc80987e, 2015-08-14 (annotated)

Committer:
mbed_official
Date:
Fri Aug 14 13:15:17 2015 +0100
Revision:
610:813dcc80987e
Synchronized with git revision 6d84db41c6833e0b9b024741eb0616a5f62d5599



Full URL: https://github.com/mbedmicro/mbed/commit/6d84db41c6833e0b9b024741eb0616a5f62d5599/



DISCO_F746NG - Improvements

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 610:813dcc80987e 1 /**
mbed_official 610:813dcc80987e 2 ******************************************************************************
mbed_official 610:813dcc80987e 3 * @file hal_tick.c
mbed_official 610:813dcc80987e 4 * @author MCD Application Team
mbed_official 610:813dcc80987e 5 * @brief Initialization of HAL tick
mbed_official 610:813dcc80987e 6 ******************************************************************************
mbed_official 610:813dcc80987e 7 * @attention
mbed_official 610:813dcc80987e 8 *
mbed_official 610:813dcc80987e 9 * <h2><center>&copy; COPYRIGHT 2015 STMicroelectronics</center></h2>
mbed_official 610:813dcc80987e 10 *
mbed_official 610:813dcc80987e 11 * Redistribution and use in source and binary forms, with or without modification,
mbed_official 610:813dcc80987e 12 * are permitted provided that the following conditions are met:
mbed_official 610:813dcc80987e 13 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 610:813dcc80987e 14 * this list of conditions and the following disclaimer.
mbed_official 610:813dcc80987e 15 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 610:813dcc80987e 16 * this list of conditions and the following disclaimer in the documentation
mbed_official 610:813dcc80987e 17 * and/or other materials provided with the distribution.
mbed_official 610:813dcc80987e 18 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 610:813dcc80987e 19 * may be used to endorse or promote products derived from this software
mbed_official 610:813dcc80987e 20 * without specific prior written permission.
mbed_official 610:813dcc80987e 21 *
mbed_official 610:813dcc80987e 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 610:813dcc80987e 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 610:813dcc80987e 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 610:813dcc80987e 25 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 610:813dcc80987e 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 610:813dcc80987e 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 610:813dcc80987e 28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 610:813dcc80987e 29 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 610:813dcc80987e 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 610:813dcc80987e 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 610:813dcc80987e 32 *
mbed_official 610:813dcc80987e 33 ******************************************************************************
mbed_official 610:813dcc80987e 34 */
mbed_official 610:813dcc80987e 35 #include "hal_tick.h"
mbed_official 610:813dcc80987e 36
mbed_official 610:813dcc80987e 37 TIM_HandleTypeDef TimMasterHandle;
mbed_official 610:813dcc80987e 38 uint32_t PreviousVal = 0;
mbed_official 610:813dcc80987e 39
mbed_official 610:813dcc80987e 40 void us_ticker_irq_handler(void);
mbed_official 610:813dcc80987e 41
mbed_official 610:813dcc80987e 42 void timer_irq_handler(void) {
mbed_official 610:813dcc80987e 43 // Channel 1 for mbed timeout
mbed_official 610:813dcc80987e 44 if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_CC1) == SET) {
mbed_official 610:813dcc80987e 45 us_ticker_irq_handler();
mbed_official 610:813dcc80987e 46 }
mbed_official 610:813dcc80987e 47
mbed_official 610:813dcc80987e 48 // Channel 2 for HAL tick
mbed_official 610:813dcc80987e 49 if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_CC2) == SET) {
mbed_official 610:813dcc80987e 50 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC2);
mbed_official 610:813dcc80987e 51 uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
mbed_official 610:813dcc80987e 52 if ((val - PreviousVal) >= HAL_TICK_DELAY) {
mbed_official 610:813dcc80987e 53 // Increment HAL variable
mbed_official 610:813dcc80987e 54 HAL_IncTick();
mbed_official 610:813dcc80987e 55 // Prepare next interrupt
mbed_official 610:813dcc80987e 56 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
mbed_official 610:813dcc80987e 57 PreviousVal = val;
mbed_official 610:813dcc80987e 58 #if 0 // For DEBUG only
mbed_official 610:813dcc80987e 59 HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_6);
mbed_official 610:813dcc80987e 60 #endif
mbed_official 610:813dcc80987e 61 }
mbed_official 610:813dcc80987e 62 }
mbed_official 610:813dcc80987e 63 }
mbed_official 610:813dcc80987e 64
mbed_official 610:813dcc80987e 65 // Reconfigure the HAL tick using a standard timer instead of systick.
mbed_official 610:813dcc80987e 66 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
mbed_official 610:813dcc80987e 67 // Enable timer clock
mbed_official 610:813dcc80987e 68 TIM_MST_RCC;
mbed_official 610:813dcc80987e 69
mbed_official 610:813dcc80987e 70 // Reset timer
mbed_official 610:813dcc80987e 71 TIM_MST_RESET_ON;
mbed_official 610:813dcc80987e 72 TIM_MST_RESET_OFF;
mbed_official 610:813dcc80987e 73
mbed_official 610:813dcc80987e 74 // Update the SystemCoreClock variable
mbed_official 610:813dcc80987e 75 SystemCoreClockUpdate();
mbed_official 610:813dcc80987e 76
mbed_official 610:813dcc80987e 77 // Configure time base
mbed_official 610:813dcc80987e 78 TimMasterHandle.Instance = TIM_MST;
mbed_official 610:813dcc80987e 79 TimMasterHandle.Init.Period = 0xFFFFFFFF;
mbed_official 610:813dcc80987e 80 TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
mbed_official 610:813dcc80987e 81 TimMasterHandle.Init.ClockDivision = 0;
mbed_official 610:813dcc80987e 82 TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
mbed_official 610:813dcc80987e 83 HAL_TIM_OC_Init(&TimMasterHandle);
mbed_official 610:813dcc80987e 84
mbed_official 610:813dcc80987e 85 NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
mbed_official 610:813dcc80987e 86 NVIC_EnableIRQ(TIM_MST_IRQ);
mbed_official 610:813dcc80987e 87
mbed_official 610:813dcc80987e 88 // Channel 1 for mbed timeout
mbed_official 610:813dcc80987e 89 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
mbed_official 610:813dcc80987e 90
mbed_official 610:813dcc80987e 91 // Channel 2 for HAL tick
mbed_official 610:813dcc80987e 92 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
mbed_official 610:813dcc80987e 93 PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
mbed_official 610:813dcc80987e 94 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
mbed_official 610:813dcc80987e 95 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
mbed_official 610:813dcc80987e 96
mbed_official 610:813dcc80987e 97 #if 0 // For DEBUG only
mbed_official 610:813dcc80987e 98 __GPIOB_CLK_ENABLE();
mbed_official 610:813dcc80987e 99 GPIO_InitTypeDef GPIO_InitStruct;
mbed_official 610:813dcc80987e 100 GPIO_InitStruct.Pin = GPIO_PIN_6;
mbed_official 610:813dcc80987e 101 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
mbed_official 610:813dcc80987e 102 GPIO_InitStruct.Pull = GPIO_PULLUP;
mbed_official 610:813dcc80987e 103 GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
mbed_official 610:813dcc80987e 104 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
mbed_official 610:813dcc80987e 105 #endif
mbed_official 610:813dcc80987e 106
mbed_official 610:813dcc80987e 107 return HAL_OK;
mbed_official 610:813dcc80987e 108 }
mbed_official 610:813dcc80987e 109
mbed_official 610:813dcc80987e 110 /**
mbed_official 610:813dcc80987e 111 * @}
mbed_official 610:813dcc80987e 112 */
mbed_official 610:813dcc80987e 113
mbed_official 610:813dcc80987e 114 /**
mbed_official 610:813dcc80987e 115 * @}
mbed_official 610:813dcc80987e 116 */
mbed_official 610:813dcc80987e 117
mbed_official 610:813dcc80987e 118 /**
mbed_official 610:813dcc80987e 119 * @}
mbed_official 610:813dcc80987e 120 */
mbed_official 610:813dcc80987e 121 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/