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:
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this list of conditions and the following disclaimer.
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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"
23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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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 __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 // Configure time base
76 TimMasterHandle
.Instance
= TIM_MST
;
77 TimMasterHandle
.Init
.Period
= 0xFFFFFFFF;
78 if ( SystemCoreClock
== 16000000 ) {
79 TimMasterHandle
.Init
.Prescaler
= (uint32_t)( SystemCoreClock
/ 1000000) - 1; // 1 µs tick
81 TimMasterHandle
.Init
.Prescaler
= (uint32_t)( SystemCoreClock
/ 2 / 1000000) - 1; // 1 µs tick
83 TimMasterHandle
.Init
.ClockDivision
= 0;
84 TimMasterHandle
.Init
.CounterMode
= TIM_COUNTERMODE_UP
;
85 TimMasterHandle
.Init
.RepetitionCounter
= 0;
86 HAL_TIM_OC_Init(&TimMasterHandle
);
88 NVIC_SetVector(TIM_MST_IRQ
, (uint32_t)timer_irq_handler
);
89 NVIC_EnableIRQ(TIM_MST_IRQ
);
91 // Channel 1 for mbed timeout
92 HAL_TIM_OC_Start(&TimMasterHandle
, TIM_CHANNEL_1
);
94 // Channel 2 for HAL tick
95 HAL_TIM_OC_Start(&TimMasterHandle
, TIM_CHANNEL_2
);
96 PreviousVal
= __HAL_TIM_GetCounter(&TimMasterHandle
);
97 __HAL_TIM_SetCompare(&TimMasterHandle
, TIM_CHANNEL_2
, PreviousVal
+ HAL_TICK_DELAY
);
98 __HAL_TIM_ENABLE_IT(&TimMasterHandle
, TIM_IT_CC2
);
100 #if 0 // For DEBUG only
101 __GPIOB_CLK_ENABLE();
102 GPIO_InitTypeDef GPIO_InitStruct
;
103 GPIO_InitStruct
.Pin
= GPIO_PIN_6
;
104 GPIO_InitStruct
.Mode
= GPIO_MODE_OUTPUT_PP
;
105 GPIO_InitStruct
.Pull
= GPIO_PULLUP
;
106 GPIO_InitStruct
.Speed
= GPIO_SPEED_FAST
;
107 HAL_GPIO_Init(GPIOB
, &GPIO_InitStruct
);
124 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/