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
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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);
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 void timer_irq_handler(void) {
48 uint16_t cval
= TIM_MST
->CNT
;
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
);
58 // Channel 1 for mbed timeout
59 if (__HAL_TIM_GET_FLAG(&TimMasterHandle
, TIM_FLAG_CC1
) == SET
) {
60 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle
, TIM_FLAG_CC1
);
61 if (oc_rem_part
> 0) {
62 set_compare(oc_rem_part
); // Finish the remaining time left
65 if (oc_int_part
> 0) {
67 oc_rem_part
= cval
; // To finish the counter loop the next time
70 us_ticker_irq_handler();
75 // Channel 2 for HAL tick
76 if (__HAL_TIM_GET_FLAG(&TimMasterHandle
, TIM_FLAG_CC2
) == SET
) {
77 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle
, TIM_FLAG_CC2
);
78 uint32_t val
= __HAL_TIM_GetCounter(&TimMasterHandle
);
79 if ((val
- PreviousVal
) >= HAL_TICK_DELAY
) {
80 // Increment HAL variable
82 // Prepare next interrupt
83 __HAL_TIM_SetCompare(&TimMasterHandle
, TIM_CHANNEL_2
, val
+ HAL_TICK_DELAY
);
89 // Reconfigure the HAL tick using a standard timer instead of systick.
90 HAL_StatusTypeDef
HAL_InitTick(uint32_t TickPriority
) {
98 // Update the SystemCoreClock variable
99 SystemCoreClockUpdate();
101 // Configure time base
102 TimMasterHandle
.Instance
= TIM_MST
;
103 TimMasterHandle
.Init
.Period
= 0xFFFFFFFF;
104 TimMasterHandle
.Init
.Prescaler
= (uint32_t)(SystemCoreClock
/ 1000000) - 1; // 1 us tick
105 TimMasterHandle
.Init
.ClockDivision
= 0;
106 TimMasterHandle
.Init
.CounterMode
= TIM_COUNTERMODE_UP
;
107 HAL_TIM_Base_Init(&TimMasterHandle
);
109 // Configure output compare channel 1 for mbed timeout (enabled later when used)
110 HAL_TIM_OC_Start(&TimMasterHandle
, TIM_CHANNEL_1
);
112 // Configure output compare channel 2 for HAL tick
113 HAL_TIM_OC_Start(&TimMasterHandle
, TIM_CHANNEL_2
);
114 PreviousVal
= __HAL_TIM_GetCounter(&TimMasterHandle
);
115 __HAL_TIM_SetCompare(&TimMasterHandle
, TIM_CHANNEL_2
, PreviousVal
+ HAL_TICK_DELAY
);
117 // Configure interrupts
118 // Update interrupt used for 32-bit counter
119 // Output compare channel 1 interrupt for mbed timeout
120 // Output compare channel 2 interrupt for HAL tick
121 NVIC_SetVector(TIM_MST_IRQ
, (uint32_t)timer_irq_handler
);
122 NVIC_EnableIRQ(TIM_MST_IRQ
);
125 __HAL_TIM_ENABLE_IT(&TimMasterHandle
, TIM_IT_UPDATE
); // For 32-bit counter
126 __HAL_TIM_ENABLE_IT(&TimMasterHandle
, TIM_IT_CC2
); // For HAL tick
129 HAL_TIM_Base_Start(&TimMasterHandle
);
145 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/