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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12 * are permitted provided that the following conditions are met:
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16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
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19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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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 us tick
81 TimMasterHandle
.Init
.ClockDivision
= 0;
82 TimMasterHandle
.Init
.CounterMode
= TIM_COUNTERMODE_UP
;
83 HAL_TIM_OC_Init(&TimMasterHandle
);
85 NVIC_SetVector(TIM_MST_IRQ
, (uint32_t)timer_irq_handler
);
86 NVIC_EnableIRQ(TIM_MST_IRQ
);
88 // Channel 1 for mbed timeout
89 HAL_TIM_OC_Start(&TimMasterHandle
, TIM_CHANNEL_1
);
91 // Channel 2 for HAL tick
92 HAL_TIM_OC_Start(&TimMasterHandle
, TIM_CHANNEL_2
);
93 PreviousVal
= __HAL_TIM_GetCounter(&TimMasterHandle
);
94 __HAL_TIM_SetCompare(&TimMasterHandle
, TIM_CHANNEL_2
, PreviousVal
+ HAL_TICK_DELAY
);
95 __HAL_TIM_ENABLE_IT(&TimMasterHandle
, TIM_IT_CC2
);
97 #if 0 // For DEBUG only
99 GPIO_InitTypeDef GPIO_InitStruct
;
100 GPIO_InitStruct
.Pin
= GPIO_PIN_6
;
101 GPIO_InitStruct
.Mode
= GPIO_MODE_OUTPUT_PP
;
102 GPIO_InitStruct
.Pull
= GPIO_PULLUP
;
103 GPIO_InitStruct
.Speed
= GPIO_SPEED_HIGH
;
104 HAL_GPIO_Init(GPIOB
, &GPIO_InitStruct
);
121 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/