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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31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 us_ticker_irq_handler();
48 // Channel 2 for HAL tick
49 if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_CC2) == SET) {
50 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC2);
51 uint32_t val = __HAL_TIM_GetCounter(&TimMasterHandle);
52 if ((val - PreviousVal) >= HAL_TICK_DELAY) {
53 // Increment HAL variable
55 // Prepare next interrupt
56 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, val + HAL_TICK_DELAY);
58 #if 0 // For DEBUG only
59 HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_6);
65 // Reconfigure the HAL tick using a standard timer instead of systick.
66 HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
74 // Update the SystemCoreClock variable
75 SystemCoreClockUpdate();
77 // Configure time base
78 TimMasterHandle.Instance = TIM_MST;
79 TimMasterHandle.Init.Period = 0xFFFFFFFF;
80 TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
81 TimMasterHandle.Init.ClockDivision = 0;
82 TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
83 TimMasterHandle.Init.RepetitionCounter = 0;
84 HAL_TIM_OC_Init(&TimMasterHandle);
86 NVIC_SetVector(TIM_MST_IRQ, (uint32_t)timer_irq_handler);
87 NVIC_EnableIRQ(TIM_MST_IRQ);
89 // Channel 1 for mbed timeout
90 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
92 // Channel 2 for HAL tick
93 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_2);
94 PreviousVal = __HAL_TIM_GetCounter(&TimMasterHandle);
95 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_2, PreviousVal + HAL_TICK_DELAY);
96 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
98 #if 0 // For DEBUG only
100 GPIO_InitTypeDef GPIO_InitStruct;
101 GPIO_InitStruct.Pin = GPIO_PIN_6;
102 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
103 GPIO_InitStruct.Pull = GPIO_PULLUP;
104 GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
105 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
122 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/