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);
41 void set_compare(uint16_t count);
43 extern volatile uint32_t SlaveCounter;
44 extern volatile uint32_t oc_int_part;
45 extern volatile uint16_t oc_rem_part;
47 // Used to increment the slave counter
48 void timer_update_irq_handler(void)
50 TimMasterHandle.Instance = TIM_MST;
52 // Clear Update interrupt flag
53 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
54 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE);
59 // Used for mbed timeout (channel 1) and HAL tick (channel 2)
60 void timer_oc_irq_handler(void)
62 uint16_t cval = TIM_MST->CNT;
63 TimMasterHandle.Instance = TIM_MST;
65 // Channel 1 for mbed timeout
66 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
67 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
68 if (oc_rem_part > 0) {
69 set_compare(oc_rem_part); // Finish the remaining time left
72 if (oc_int_part > 0) {
74 oc_rem_part = cval; // To finish the counter loop the next time
77 us_ticker_irq_handler();
82 // Channel 2 for HAL tick
83 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC2) == SET) {
84 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC2);
85 uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
86 if ((val - PreviousVal) >= HAL_TICK_DELAY) {
87 // Increment HAL variable
89 // Prepare next interrupt
90 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
92 #if 1 // For DEBUG only
93 HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_6);
99 // Reconfigure the HAL tick using a standard timer instead of systick.
100 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
101 // Enable timer clock
108 // Update the SystemCoreClock variable
109 SystemCoreClockUpdate();
111 // Configure time base
112 TimMasterHandle.Instance = TIM_MST;
113 TimMasterHandle.Init.Period = 0xFFFF;
114 TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
115 TimMasterHandle.Init.ClockDivision = 0;
116 TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
117 HAL_TIM_Base_Init(&TimMasterHandle);
119 // Configure output compare channel 1 for mbed timeout (enabled later when used)
120 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
122 // Configure output compare channel 2 for HAL tick
123 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
124 PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
125 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
127 // Configure interrupts
128 // Update interrupt used for 32-bit counter
129 // Output compare channel 1 interrupt for mbed timeout
130 // Output compare channel 2 interrupt for HAL tick
131 NVIC_SetVector(TIM_MST_UP_IRQ, (uint32_t)timer_update_irq_handler);
132 NVIC_EnableIRQ(TIM_MST_UP_IRQ);
133 NVIC_SetVector(TIM_MST_OC_IRQ, (uint32_t)timer_oc_irq_handler);
134 NVIC_EnableIRQ(TIM_MST_OC_IRQ);
137 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_UPDATE); // For 32-bit counter
138 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2); // For HAL tick
141 HAL_TIM_Base_Start(&TimMasterHandle);
143 #if 1 // For DEBUG only
144 __GPIOB_CLK_ENABLE();
145 GPIO_InitTypeDef GPIO_InitStruct;
146 GPIO_InitStruct.Pin = GPIO_PIN_6;
147 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
148 GPIO_InitStruct.Pull = GPIO_PULLUP;
149 GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
150 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
167 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/