en 129 / mbed-dev

fix LPC812 PWM

Dependents:   IR_LED_Send

Fork of mbed-dev by mbed official

targets/cmsis/TARGET_STM/TARGET_STM32L0/TARGET_NUCLEO_L053R8/hal_tick.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /**
bogdanm 0:9b334a45a8ff 2 ******************************************************************************
bogdanm 0:9b334a45a8ff 3 * @file hal_tick.c
bogdanm 0:9b334a45a8ff 4 * @author MCD Application Team
bogdanm 0:9b334a45a8ff 5 * @brief Initialization of HAL tick
bogdanm 0:9b334a45a8ff 6 ******************************************************************************
bogdanm 0:9b334a45a8ff 7 * @attention
bogdanm 0:9b334a45a8ff 8 *
bogdanm 0:9b334a45a8ff 9 * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
bogdanm 0:9b334a45a8ff 10 *
bogdanm 0:9b334a45a8ff 11 * Redistribution and use in source and binary forms, with or without modification,
bogdanm 0:9b334a45a8ff 12 * are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 13 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 14 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 15 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 16 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 17 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 18 * 3. Neither the name of STMicroelectronics nor the names of its contributors
bogdanm 0:9b334a45a8ff 19 * may be used to endorse or promote products derived from this software
bogdanm 0:9b334a45a8ff 20 * without specific prior written permission.
bogdanm 0:9b334a45a8ff 21 *
bogdanm 0:9b334a45a8ff 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
bogdanm 0:9b334a45a8ff 25 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
bogdanm 0:9b334a45a8ff 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
bogdanm 0:9b334a45a8ff 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
bogdanm 0:9b334a45a8ff 28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
bogdanm 0:9b334a45a8ff 29 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
bogdanm 0:9b334a45a8ff 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
bogdanm 0:9b334a45a8ff 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 32 *
bogdanm 0:9b334a45a8ff 33 ******************************************************************************
bogdanm 0:9b334a45a8ff 34 */
bogdanm 0:9b334a45a8ff 35 #include "hal_tick.h"
bogdanm 0:9b334a45a8ff 36
bogdanm 0:9b334a45a8ff 37 TIM_HandleTypeDef TimMasterHandle;
bogdanm 0:9b334a45a8ff 38 uint32_t PreviousVal = 0;
bogdanm 0:9b334a45a8ff 39
bogdanm 0:9b334a45a8ff 40 void us_ticker_irq_handler(void);
bogdanm 0:9b334a45a8ff 41 void set_compare(uint16_t count);
bogdanm 0:9b334a45a8ff 42
bogdanm 0:9b334a45a8ff 43 extern volatile uint32_t SlaveCounter;
bogdanm 0:9b334a45a8ff 44 extern volatile uint32_t oc_int_part;
bogdanm 0:9b334a45a8ff 45 extern volatile uint16_t oc_rem_part;
bogdanm 0:9b334a45a8ff 46
bogdanm 0:9b334a45a8ff 47 void timer_irq_handler(void) {
bogdanm 0:9b334a45a8ff 48 uint16_t cval = TIM_MST->CNT;
bogdanm 0:9b334a45a8ff 49
bogdanm 0:9b334a45a8ff 50 TimMasterHandle.Instance = TIM_MST;
bogdanm 0:9b334a45a8ff 51
bogdanm 0:9b334a45a8ff 52 // Clear Update interrupt flag
bogdanm 0:9b334a45a8ff 53 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
bogdanm 0:9b334a45a8ff 54 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE);
bogdanm 0:9b334a45a8ff 55 SlaveCounter++;
bogdanm 0:9b334a45a8ff 56 }
bogdanm 0:9b334a45a8ff 57
bogdanm 0:9b334a45a8ff 58 // Channel 1 for mbed timeout
bogdanm 0:9b334a45a8ff 59 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
bogdanm 0:9b334a45a8ff 60 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
bogdanm 0:9b334a45a8ff 61 if (oc_rem_part > 0) {
bogdanm 0:9b334a45a8ff 62 set_compare(oc_rem_part); // Finish the remaining time left
bogdanm 0:9b334a45a8ff 63 oc_rem_part = 0;
bogdanm 0:9b334a45a8ff 64 } else {
bogdanm 0:9b334a45a8ff 65 if (oc_int_part > 0) {
bogdanm 0:9b334a45a8ff 66 set_compare(0xFFFF);
bogdanm 0:9b334a45a8ff 67 oc_rem_part = cval; // To finish the counter loop the next time
bogdanm 0:9b334a45a8ff 68 oc_int_part--;
bogdanm 0:9b334a45a8ff 69 } else {
bogdanm 0:9b334a45a8ff 70 us_ticker_irq_handler();
bogdanm 0:9b334a45a8ff 71 }
bogdanm 0:9b334a45a8ff 72 }
bogdanm 0:9b334a45a8ff 73 }
bogdanm 0:9b334a45a8ff 74
bogdanm 0:9b334a45a8ff 75 // Channel 2 for HAL tick
bogdanm 0:9b334a45a8ff 76 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC2) == SET) {
bogdanm 0:9b334a45a8ff 77 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC2);
bogdanm 0:9b334a45a8ff 78 uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
bogdanm 0:9b334a45a8ff 79 if ((val - PreviousVal) >= HAL_TICK_DELAY) {
bogdanm 0:9b334a45a8ff 80 // Increment HAL variable
bogdanm 0:9b334a45a8ff 81 HAL_IncTick();
bogdanm 0:9b334a45a8ff 82 // Prepare next interrupt
bogdanm 0:9b334a45a8ff 83 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
bogdanm 0:9b334a45a8ff 84 PreviousVal = val;
bogdanm 0:9b334a45a8ff 85 }
bogdanm 0:9b334a45a8ff 86 }
bogdanm 0:9b334a45a8ff 87 }
bogdanm 0:9b334a45a8ff 88
bogdanm 0:9b334a45a8ff 89 // Reconfigure the HAL tick using a standard timer instead of systick.
bogdanm 0:9b334a45a8ff 90 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
bogdanm 0:9b334a45a8ff 91 // Enable timer clock
bogdanm 0:9b334a45a8ff 92 TIM_MST_RCC;
bogdanm 0:9b334a45a8ff 93
bogdanm 0:9b334a45a8ff 94 // Reset timer
bogdanm 0:9b334a45a8ff 95 TIM_MST_RESET_ON;
bogdanm 0:9b334a45a8ff 96 TIM_MST_RESET_OFF;
bogdanm 0:9b334a45a8ff 97
bogdanm 0:9b334a45a8ff 98 // Update the SystemCoreClock variable
bogdanm 0:9b334a45a8ff 99 SystemCoreClockUpdate();
bogdanm 0:9b334a45a8ff 100
bogdanm 0:9b334a45a8ff 101 // Configure time base
bogdanm 0:9b334a45a8ff 102 TimMasterHandle.Instance = TIM_MST;
bogdanm 0:9b334a45a8ff 103 TimMasterHandle.Init.Period = 0xFFFFFFFF;
bogdanm 0:9b334a45a8ff 104 TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
bogdanm 0:9b334a45a8ff 105 TimMasterHandle.Init.ClockDivision = 0;
bogdanm 0:9b334a45a8ff 106 TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
bogdanm 0:9b334a45a8ff 107 HAL_TIM_Base_Init(&TimMasterHandle);
bogdanm 0:9b334a45a8ff 108
bogdanm 0:9b334a45a8ff 109 // Configure output compare channel 1 for mbed timeout (enabled later when used)
bogdanm 0:9b334a45a8ff 110 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
bogdanm 0:9b334a45a8ff 111
bogdanm 0:9b334a45a8ff 112 // Configure output compare channel 2 for HAL tick
bogdanm 0:9b334a45a8ff 113 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
bogdanm 0:9b334a45a8ff 114 PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
bogdanm 0:9b334a45a8ff 115 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
bogdanm 0:9b334a45a8ff 116
bogdanm 0:9b334a45a8ff 117 // Configure interrupts
bogdanm 0:9b334a45a8ff 118 // Update interrupt used for 32-bit counter
bogdanm 0:9b334a45a8ff 119 // Output compare channel 1 interrupt for mbed timeout
bogdanm 0:9b334a45a8ff 120 // Output compare channel 2 interrupt for HAL tick
bogdanm 0:9b334a45a8ff 121 NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
bogdanm 0:9b334a45a8ff 122 NVIC_EnableIRQ(TIM_MST_IRQ);
bogdanm 0:9b334a45a8ff 123
bogdanm 0:9b334a45a8ff 124 // Enable interrupts
bogdanm 0:9b334a45a8ff 125 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_UPDATE); // For 32-bit counter
bogdanm 0:9b334a45a8ff 126 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2); // For HAL tick
bogdanm 0:9b334a45a8ff 127
bogdanm 0:9b334a45a8ff 128 // Enable timer
bogdanm 0:9b334a45a8ff 129 HAL_TIM_Base_Start(&TimMasterHandle);
bogdanm 0:9b334a45a8ff 130
bogdanm 0:9b334a45a8ff 131 return HAL_OK;
bogdanm 0:9b334a45a8ff 132 }
bogdanm 0:9b334a45a8ff 133
bogdanm 0:9b334a45a8ff 134 /**
bogdanm 0:9b334a45a8ff 135 * @}
bogdanm 0:9b334a45a8ff 136 */
bogdanm 0:9b334a45a8ff 137
bogdanm 0:9b334a45a8ff 138 /**
bogdanm 0:9b334a45a8ff 139 * @}
bogdanm 0:9b334a45a8ff 140 */
bogdanm 0:9b334a45a8ff 141
bogdanm 0:9b334a45a8ff 142 /**
bogdanm 0:9b334a45a8ff 143 * @}
bogdanm 0:9b334a45a8ff 144 */
bogdanm 0:9b334a45a8ff 145 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/