1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/**
@page PWR_PVD PWR Programmable Voltage Detector (PVD) example
@verbatim
******************************************************************************
* @file PWR/PWR_PVD/readme.txt
* @author MCD Application Team
* @brief Description of the PWR Programmable Voltage Detector (PVD) example
******************************************************************************
*
* Copyright (c) 2019-2021 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
@endverbatim
@par Example Description
How to configure the programmable voltage detector by using an external interrupt
line. External DC supply must be used to supply Vdd.
In this example, EXTI line 0 is configured to generate an interrupt on each rising
or falling edge of the PVD output signal (which indicates that the Vdd voltage is
moving below or above the PVD threshold). As long as the voltage is above the
target threshold (2.5V), LED2 is blinking with a 200 ms-period; when the voltage drops
below the threshold, LED2 stops blinking and remains constantly on (or appears
to be turned off if the voltage is getting really low); when the voltage moves back
above the target threshold, LED2 starts blinking again.
@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.
@par Keywords
Power, PWR, EXTI, PVD, Interrupt, Wakeup, External reset
@par Directory contents
- PWR/PWR_PVD/Inc/nucleo_wb15cc_conf.h BSP configuration file
- PWR/PWR_PVD/Inc/stm32wbxx_hal_conf.h HAL Configuration file
- PWR/PWR_PVD/Inc/stm32wbxx_it.h Header for stm32wbxx_it.c
- PWR/PWR_PVD/Inc/main.h Header file for main.c
- PWR/PWR_PVD/Src/system_stm32wbxx.c STM32WBxx system clock configuration file
- PWR/PWR_PVD/Src/stm32wbxx_it.c Interrupt handlers
- PWR/PWR_PVD/Src/stm32wbxx_hal_msp.c HAL MSP module
- PWR/PWR_PVD/Src/main.c Main program
@par Hardware and Software environment
- This example runs on STM32WB15xx devices
- This example has been tested with STMicroelectronics NUCLEO-WB15CC
board and can be easily tailored to any other supported device
and development board.
- NUCLEO-WB15CC Set-up :
- Remove jumper on JP2 connector.
- Provide power supply (DC voltage) to JP2 connector, pin "VDD".
- LED2 (GREEN) connected to PB.00 pin indicates the behavior of
the test software as explained above.
@par How to use it ?
In order to make the program work, you must do the following :
- Open your preferred toolchain
- Rebuild all files and load your image into target memory
- Run the example
* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
*/
|
