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179 lines
7.7 KiB
Plaintext
179 lines
7.7 KiB
Plaintext
/**
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@page PWR_CurrentConsumption PWR Current Consumption example
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@verbatim
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******************************************************************************
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* @file PWR/PWR_CurrentConsumption/readme.txt
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* @author MCD Application Team
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* @brief Description of the PWR Current Consumption example.
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******************************************************************************
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*
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* Copyright (c) 2016 STMicroelectronics. All rights reserved.
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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How to configure the system to measure the current consumption in different
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low-power modes.
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The Low Power modes are:
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- Sleep Mode
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- STOP mode with RTC
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- STANDBY mode without RTC and BKPSRAM
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- STANDBY mode with RTC
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- STANDBY mode with BKPSRAM
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To run this example, user has to follow these steps:
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1. Select the Low power modes to be measured by uncommenting the corresponding
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line inside the stm32f7xx_lp_modes.h file.
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@code
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/* #define SLEEP_MODE */
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/* #define STOP_MODE */
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/* #define STANDBY_MODE */
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/* #define STANDBY_RTC_MODE */
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/* #define STANDBY_BKPSRAM_MODE */
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@endcode
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2. Use an external amperemeter to measure the IDD current.
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3. This example can not be used in DEBUG mode, this is due to the fact that the
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Cortex-M7 core is no longer clocked during low power mode so debugging
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features are disabled.
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Here below a detailed description of the example code:
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@verbatim
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1. After reset, the program waits for User button connected to the PC.13 to be
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pressed - green LED (LED1) is blinking slowly (1 sec.)- to enter the selected low power mode.
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- When the RTC is not used in the low power mode configuration, press
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again the User button (PC.13) to exit the low power mode.
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Green LED (LED1) toggles while entering in User button press IT callback.
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- When the RTC is used, the wakeup from low power mode is automatically
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generated by the RTC (after 20s)
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Green LED (LED1) toggles while entering in RTC IT callback.
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--> In anyway, wrong end of test is showing red LED (LED3) stay ON
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2. Low power modes description:
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- Sleep Mode
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============
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- System Running at PLL (216MHz)
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- Flash 3 wait state
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- Instruction and Data caches ON
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- Prefetch OFF
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- Code running from Internal FLASH
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- All peripherals disabled
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- Wakeup using EXTI Line (User Button PC.13)
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- STOP Mode
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===========
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- RTC Clocked by LSI
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- Regulator in LP mode
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- HSI, HSE OFF and LSI if not used as RTC Clock source
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- No IWDG
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- FLASH in deep power down mode
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- Automatic Wakeup using RTC clocked by LSI (after ~20s)
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- STANDBY Mode
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==============
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- Backup SRAM and RTC OFF
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- IWDG and LSI OFF
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- Wakeup using EXTI Line (User Button PC.13)
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- STANDBY Mode with RTC clocked by LSI
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==========================================
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- RTC Clocked by LSI
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- IWDG OFF and LSI OFF if not used as RTC Clock source
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- Backup SRAM OFF
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- Automatic Wakeup using RTC clocked by LSI (after ~20s)
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- STANDBY Mode with backup SRAM ON
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======================================================
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- RTC Clocked by LSI
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- IWDG OFF and LSI OFF if not used as RTC Clock source
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- Backup SRAM ON
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- Automatic Wakeup using RTC clocked by LSI (after ~20s)
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@endverbatim
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@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
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based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
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than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
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To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
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to have correct HAL operation.
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@note On the NUCLEO-F767ZI board, an extra current consumption(~4µA) is added due to the Ethernet PHY.
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So, to reach the correct current consumption values, this example configures the Ethernet
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PHYs in Low power mode.
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@par Keywords
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Power, STOP, Sleep, Standby, Current Consumption, Low Power, LSI, Backup SRAM, Voltage range
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@Note If the user code size exceeds the DTCM-RAM size or starts from internal cacheable memories (SRAM1 and SRAM2),that is shared between several processors,
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then it is highly recommended to enable the CPU cache and maintain its coherence at application level.
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The address and the size of cacheable buffers (shared between CPU and other masters) must be properly updated to be aligned to cache line size (32 bytes).
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@Note It is recommended to enable the cache and maintain its coherence, but depending on the use case
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It is also possible to configure the MPU as "Write through", to guarantee the write access coherence.
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In that case, the MPU must be configured as Cacheable/Bufferable/Not Shareable.
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Even though the user must manage the cache coherence for read accesses.
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Please refer to the AN4838 “Managing memory protection unit (MPU) in STM32 MCUs”
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Please refer to the AN4839 “Level 1 cache on STM32F7 Series”
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@par Directory contents
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- PWR/PWR_CurrentConsumption/Inc/stm32f7xx_hal_conf.h HAL configuration file
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- PWR/PWR_CurrentConsumption/Inc/stm32f7xx_it.h Interrupt handlers header file
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- PWR/PWR_CurrentConsumption/Inc/main.h Main program header file
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- PWR/PWR_CurrentConsumption/Inc/stm32f7xx_lp_modes.h STM32F7xx Low Power Modes header file
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- PWR/PWR_CurrentConsumption/Src/stm32f7xx_it.c Interrupt handlers
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- PWR/PWR_CurrentConsumption/Src/main.c Main program
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- PWR/PWR_CurrentConsumption/Src/stm32f7xx_hal_msp.c HAL MSP module
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- PWR/PWR_CurrentConsumption/Src/stm32f7xx_lp_modes.c STM32F7xx Low Power Modes source file
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- PWR/PWR_CurrentConsumption/Src/system_stm32f7xx.c STM32F7xx system clock configuration file
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@par Hardware and Software environment
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- This example runs on STM32F767ZI devices.
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- This example has been tested with STMicroelectronics NUCLEO-F767ZI
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board and can be easily tailored to any other supported device
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and development board.
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- NUCLEO-F767ZI Set-up
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- Use LED3 connected to PB14 pin.
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* LED3 (RED) will stay ON if initialization fails.
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- Use LED1 connected to PB00 pin.
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* LED1 (GREEN) will slowly toggle (1sec.) waiting for user to launch test, then will turn OFF
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* LED1 (GREEN) will toggle fast (100ms) while returning from STANDBY mode (PWR flag check callback)
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* LED1 (GREEN) will toggle fast (100ms) at the end of test in case of success.
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- Use User Button connected to PC13 pin.
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- Connect an amperemeter to jumper JP5 to measure the IDD current
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@par How to use it ?
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In order to make the program work, you must do the following :
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- Open your preferred toolchain
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- Rebuild all files and load your image into target memory
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- Run the example
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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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