Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/cmsis/TARGET_STM/TARGET_STM32F7/TARGET_DISCO_F746NG/hal_tick.c@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /**
<> 144:ef7eb2e8f9f7 2 ******************************************************************************
<> 144:ef7eb2e8f9f7 3 * @file hal_tick.c
<> 144:ef7eb2e8f9f7 4 * @author MCD Application Team
<> 144:ef7eb2e8f9f7 5 * @brief Initialization of HAL tick
<> 144:ef7eb2e8f9f7 6 ******************************************************************************
<> 144:ef7eb2e8f9f7 7 * @attention
<> 144:ef7eb2e8f9f7 8 *
<> 144:ef7eb2e8f9f7 9 * <h2><center>&copy; COPYRIGHT 2016 STMicroelectronics</center></h2>
<> 144:ef7eb2e8f9f7 10 *
<> 144:ef7eb2e8f9f7 11 * Redistribution and use in source and binary forms, with or without modification,
<> 144:ef7eb2e8f9f7 12 * are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 13 * 1. Redistributions of source code must retain the above copyright notice,
<> 144:ef7eb2e8f9f7 14 * this list of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 15 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 144:ef7eb2e8f9f7 16 * this list of conditions and the following disclaimer in the documentation
<> 144:ef7eb2e8f9f7 17 * and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 18 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 144:ef7eb2e8f9f7 19 * may be used to endorse or promote products derived from this software
<> 144:ef7eb2e8f9f7 20 * without specific prior written permission.
<> 144:ef7eb2e8f9f7 21 *
<> 144:ef7eb2e8f9f7 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 144:ef7eb2e8f9f7 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 144:ef7eb2e8f9f7 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 25 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 144:ef7eb2e8f9f7 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 144:ef7eb2e8f9f7 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 144:ef7eb2e8f9f7 28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 144:ef7eb2e8f9f7 29 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 144:ef7eb2e8f9f7 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 144:ef7eb2e8f9f7 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 32 *
<> 144:ef7eb2e8f9f7 33 ******************************************************************************
<> 144:ef7eb2e8f9f7 34 */
<> 144:ef7eb2e8f9f7 35 #include "hal_tick.h"
<> 144:ef7eb2e8f9f7 36
<> 144:ef7eb2e8f9f7 37 // 0=NO, 1=PG6 toggles at each tick
<> 144:ef7eb2e8f9f7 38 #define DEBUG_TICK 0
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 TIM_HandleTypeDef TimMasterHandle;
<> 144:ef7eb2e8f9f7 41 uint32_t PreviousVal = 0;
<> 144:ef7eb2e8f9f7 42
<> 144:ef7eb2e8f9f7 43 void HAL_IncTick(void);
<> 144:ef7eb2e8f9f7 44 void us_ticker_irq_handler(void);
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 void timer_irq_handler(void) {
<> 144:ef7eb2e8f9f7 47 // Channel 1 for mbed timeout
<> 144:ef7eb2e8f9f7 48 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
<> 144:ef7eb2e8f9f7 49 if (__HAL_TIM_GET_IT_SOURCE(&TimMasterHandle, TIM_IT_CC1) == SET) {
<> 144:ef7eb2e8f9f7 50 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
<> 144:ef7eb2e8f9f7 51 us_ticker_irq_handler();
<> 144:ef7eb2e8f9f7 52 }
<> 144:ef7eb2e8f9f7 53 }
<> 144:ef7eb2e8f9f7 54
<> 144:ef7eb2e8f9f7 55 // Channel 2 for HAL tick
<> 144:ef7eb2e8f9f7 56 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC2) == SET) {
<> 144:ef7eb2e8f9f7 57 if (__HAL_TIM_GET_IT_SOURCE(&TimMasterHandle, TIM_IT_CC2) == SET) {
<> 144:ef7eb2e8f9f7 58 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC2);
<> 144:ef7eb2e8f9f7 59 uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
<> 144:ef7eb2e8f9f7 60 if ((val - PreviousVal) >= HAL_TICK_DELAY) {
<> 144:ef7eb2e8f9f7 61 // Increment HAL variable
<> 144:ef7eb2e8f9f7 62 HAL_IncTick();
<> 144:ef7eb2e8f9f7 63 // Prepare next interrupt
<> 144:ef7eb2e8f9f7 64 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
<> 144:ef7eb2e8f9f7 65 PreviousVal = val;
<> 144:ef7eb2e8f9f7 66 #if DEBUG_TICK > 0
<> 144:ef7eb2e8f9f7 67 HAL_GPIO_TogglePin(GPIOG, GPIO_PIN_6);
<> 144:ef7eb2e8f9f7 68 #endif
<> 144:ef7eb2e8f9f7 69 }
<> 144:ef7eb2e8f9f7 70 }
<> 144:ef7eb2e8f9f7 71 }
<> 144:ef7eb2e8f9f7 72 }
<> 144:ef7eb2e8f9f7 73
<> 144:ef7eb2e8f9f7 74 // Reconfigure the HAL tick using a standard timer instead of systick.
<> 144:ef7eb2e8f9f7 75 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
<> 144:ef7eb2e8f9f7 76 RCC_ClkInitTypeDef RCC_ClkInitStruct;
<> 144:ef7eb2e8f9f7 77 uint32_t PclkFreq;
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 // Get clock configuration
<> 144:ef7eb2e8f9f7 80 // Note: PclkFreq contains here the Latency (not used after)
<> 144:ef7eb2e8f9f7 81 HAL_RCC_GetClockConfig(&RCC_ClkInitStruct, &PclkFreq);
<> 144:ef7eb2e8f9f7 82
<> 144:ef7eb2e8f9f7 83 // Get TIM5 clock value
<> 144:ef7eb2e8f9f7 84 PclkFreq = HAL_RCC_GetPCLK1Freq();
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 // Enable timer clock
<> 144:ef7eb2e8f9f7 87 TIM_MST_RCC;
<> 144:ef7eb2e8f9f7 88
<> 144:ef7eb2e8f9f7 89 // Reset timer
<> 144:ef7eb2e8f9f7 90 TIM_MST_RESET_ON;
<> 144:ef7eb2e8f9f7 91 TIM_MST_RESET_OFF;
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 // Configure time base
<> 144:ef7eb2e8f9f7 94 TimMasterHandle.Instance = TIM_MST;
<> 144:ef7eb2e8f9f7 95 TimMasterHandle.Init.Period = 0xFFFFFFFF;
<> 144:ef7eb2e8f9f7 96
<> 144:ef7eb2e8f9f7 97 // TIMxCLK = PCLKx when the APB prescaler = 1 else TIMxCLK = 2 * PCLKx
<> 144:ef7eb2e8f9f7 98 if (RCC_ClkInitStruct.APB1CLKDivider == RCC_HCLK_DIV1)
<> 144:ef7eb2e8f9f7 99 TimMasterHandle.Init.Prescaler = (uint16_t)((PclkFreq) / 1000000) - 1; // 1 us tick
<> 144:ef7eb2e8f9f7 100 else
<> 144:ef7eb2e8f9f7 101 TimMasterHandle.Init.Prescaler = (uint16_t)((PclkFreq * 2) / 1000000) - 1; // 1 us tick
<> 144:ef7eb2e8f9f7 102
<> 144:ef7eb2e8f9f7 103 TimMasterHandle.Init.ClockDivision = 0;
<> 144:ef7eb2e8f9f7 104 TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
<> 144:ef7eb2e8f9f7 105 TimMasterHandle.Init.RepetitionCounter = 0;
<> 144:ef7eb2e8f9f7 106 HAL_TIM_OC_Init(&TimMasterHandle);
<> 144:ef7eb2e8f9f7 107
<> 144:ef7eb2e8f9f7 108 NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
<> 144:ef7eb2e8f9f7 109 NVIC_EnableIRQ(TIM_MST_IRQ);
<> 144:ef7eb2e8f9f7 110
<> 144:ef7eb2e8f9f7 111 // Channel 1 for mbed timeout
<> 144:ef7eb2e8f9f7 112 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
<> 144:ef7eb2e8f9f7 113
<> 144:ef7eb2e8f9f7 114 // Channel 2 for HAL tick
<> 144:ef7eb2e8f9f7 115 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
<> 144:ef7eb2e8f9f7 116 PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
<> 144:ef7eb2e8f9f7 117 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
<> 144:ef7eb2e8f9f7 118 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
<> 144:ef7eb2e8f9f7 119
<> 144:ef7eb2e8f9f7 120 #if DEBUG_TICK > 0
<> 144:ef7eb2e8f9f7 121 __GPIOG_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 122 GPIO_InitTypeDef GPIO_InitStruct;
<> 144:ef7eb2e8f9f7 123 GPIO_InitStruct.Pin = GPIO_PIN_6;
<> 144:ef7eb2e8f9f7 124 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
<> 144:ef7eb2e8f9f7 125 GPIO_InitStruct.Pull = GPIO_PULLUP;
<> 144:ef7eb2e8f9f7 126 GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
<> 144:ef7eb2e8f9f7 127 HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
<> 144:ef7eb2e8f9f7 128 #endif
<> 144:ef7eb2e8f9f7 129
<> 144:ef7eb2e8f9f7 130 return HAL_OK;
<> 144:ef7eb2e8f9f7 131 }
<> 144:ef7eb2e8f9f7 132
<> 144:ef7eb2e8f9f7 133 __INLINE void HAL_SuspendTick(void)
<> 144:ef7eb2e8f9f7 134 {
<> 144:ef7eb2e8f9f7 135 TimMasterHandle.Instance = TIM_MST;
<> 144:ef7eb2e8f9f7 136
<> 144:ef7eb2e8f9f7 137 // Disable HAL tick and us_ticker update interrupts (used for 32 bit counter)
<> 144:ef7eb2e8f9f7 138 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC2);
<> 144:ef7eb2e8f9f7 139 }
<> 144:ef7eb2e8f9f7 140
<> 144:ef7eb2e8f9f7 141 __INLINE void HAL_ResumeTick(void)
<> 144:ef7eb2e8f9f7 142 {
<> 144:ef7eb2e8f9f7 143 TimMasterHandle.Instance = TIM_MST;
<> 144:ef7eb2e8f9f7 144
<> 144:ef7eb2e8f9f7 145 // Enable HAL tick and us_ticker update interrupts (used for 32 bit counter)
<> 144:ef7eb2e8f9f7 146 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
<> 144:ef7eb2e8f9f7 147 }
<> 144:ef7eb2e8f9f7 148 /**
<> 144:ef7eb2e8f9f7 149 * @}
<> 144:ef7eb2e8f9f7 150 */
<> 144:ef7eb2e8f9f7 151
<> 144:ef7eb2e8f9f7 152 /**
<> 144:ef7eb2e8f9f7 153 * @}
<> 144:ef7eb2e8f9f7 154 */
<> 144:ef7eb2e8f9f7 155
<> 144:ef7eb2e8f9f7 156 /**
<> 144:ef7eb2e8f9f7 157 * @}
<> 144:ef7eb2e8f9f7 158 */
<> 144:ef7eb2e8f9f7 159 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/