182 lines
7.6 KiB
Plaintext
182 lines
7.6 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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* @attention
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*
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* Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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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 RTC and BKPSRAM
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To run this example, user has to follow the following 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 Key button connected to the PI.11 to be
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pressed - LED Green (LED1) is blinking slowly - 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 Key button to exit the low power mode.
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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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2. After exit from SLEEP or STOP Low power mode the LED 1 is turned ON for 2 seconds.
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After exit from STANDBY mode, the program is reset so it restarts from step 1.
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3. The sequence will be repeated from step 1
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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 5 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 on PI.11 pin)
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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 WakeUp Pin (USER Button on PI.11 pin)
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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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- Backup SRAM ON
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- IWDG OFF
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- Wakeup using WakeUp Pin (USER Button on PI.11 pin)
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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 STM32F746G-Discovery board, an extra current consumption(~1mA) is added due to the Ethernet
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and USB PHYs. So, to reach the correct current consumption values, this example configures the Ethernet
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and USB 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<74>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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<20><><EFBFBD><EFBFBD><EFBFBD>then it is highly recommended to enable the CPU cache and maintain its coherence at application level.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>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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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> It is also possible to configure the MPU as "Write through", to guarantee the write access coherence.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>In that case, the MPU must be configured as Cacheable/Bufferable/Not Shareable.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Even though the user must manage the cache coherence for read accesses.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Please refer to the AN4838 <20>Managing memory protection unit (MPU) in STM32 MCUs<55>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Please refer to the AN4839 <20>Level 1 cache on STM32F7 Series<65>
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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 STM32F746xx devices.
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- This example has been tested with STMicroelectronics STM32F746G-Discovery RevB
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boards and can be easily tailored to any other supported device
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and development board.
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- STM32F746G-Discovery RevB Set-up
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- Use LED1 connected to PI1 pin.
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* LED1 blinks rapidly if initialization fails or other error occurs.
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* LED1 blinks slowly waiting for user to launch test, then be turned OFF.
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* LED1 will be ON while executing EXTI callback in any mode but
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standby one.
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* LED1 will be ON while executing RTC wakeup callback in any mode but
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standby one.
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* LED1 will be ON while returning from STANDBY mode (PWR flag check callback)
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* LED1 blinks slowly at the end of test.
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- Use USER Button connected to PI.11 pin.
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- Unsolder R21 resistor (0 ohm) and connect an amperemeter to the pads of this resistor 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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*/
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