2 ******************************************************************************
4 * @author MCD Application Team
5 * @brief Initialization of HAL tick
6 ******************************************************************************
9 * <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2>
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33 ******************************************************************************
37 TIM_HandleTypeDef TimMasterHandle;
38 uint32_t PreviousVal = 0;
40 void us_ticker_irq_handler(void);
42 void timer_irq_handler(void) {
43 // Channel 1 for mbed timeout
44 if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_CC1) == SET) {
45 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
46 us_ticker_irq_handler();
49 // Channel 2 for HAL tick
50 if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_CC2) == SET) {
51 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC2);
52 uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
53 if ((val - PreviousVal) >= HAL_TICK_DELAY) {
54 // Increment HAL variable
56 // Prepare next interrupt
57 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
59 #if 0 // For DEBUG only
60 HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_6);
66 // Reconfigure the HAL tick using a standard timer instead of systick.
67 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
75 // Update the SystemCoreClock variable
76 SystemCoreClockUpdate();
78 // Configure time base
79 TimMasterHandle.Instance = TIM_MST;
80 TimMasterHandle.Init.Period = 0xFFFFFFFF;
81 TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
82 TimMasterHandle.Init.ClockDivision = 0;
83 TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
84 TimMasterHandle.Init.RepetitionCounter = 0;
85 HAL_TIM_OC_Init(&TimMasterHandle);
87 NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
88 NVIC_EnableIRQ(TIM_MST_IRQ);
90 // Channel 1 for mbed timeout
91 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
93 // Channel 2 for HAL tick
94 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
95 PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
96 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
97 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
99 #if 0 // For DEBUG only
100 __GPIOB_CLK_ENABLE();
101 GPIO_InitTypeDef GPIO_InitStruct;
102 GPIO_InitStruct.Pin = GPIO_PIN_6;
103 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
104 GPIO_InitStruct.Pull = GPIO_PULLUP;
105 GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
106 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
123 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/