2019-07-08 12:45:16 +01:00
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/**
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@page UART_WakeUpFromStop UART Wake up from Stop mode example
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file UART/UART_WakeUpFromStop/readme.txt
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* @author MCD Application Team
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* @brief Description of the UART-triggered MCU wake-up from STOP mode.
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******************************************************************************
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2019-10-18 12:36:04 +01:00
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* @attention
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2019-07-08 12:45:16 +01:00
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*
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2019-10-18 12:36:04 +01:00
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* <h2><center>© Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.</center></h2>
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2019-07-08 12:45:16 +01:00
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*
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2019-10-18 12:36:04 +01:00
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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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2019-07-08 12:45:16 +01:00
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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Configuration of an UART to wake up the MCU from STOP mode
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when a given stimulus is received.
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Board: STM32F091RC-Nucleo RevC (embeds a STM32F091RCT6 device)
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Tx Pin: PA.09
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Rx Pin: PA.10
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_________________________ _________________________
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| ______________| |______________ |
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| |USART | | USART| |
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| | TX |_____________________| RX | |
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| | RX |_____________________| TX | |
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| |______________| |______________| |
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| STM32 Board 1 | | STM32 Board 2 |
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| (follows a sequence of | | (sends stimuli to wake |
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| RUN/STOP modes) | | up STM32 Board 1) |
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|_________________________| |_________________________|
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Board 1 enters STOP mode and is awoken by Board 2 which sends
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the proper data to wake up the board 1 MCU.
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When the proper wake-up event is recognized, the WUF interrupt is triggered which wakes
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up board 1.
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To confirm its wake up, board 1 sends a confirmation message to board 2 which
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checks it is the expected message.
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This cycle is repeated 4 times to verify 4 different events
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1<EFBFBD>) wake-up by RXNE flag rising
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2<EFBFBD>) wake-up by Start Bit detection
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3<EFBFBD>) wake-up by 7-bit long address match
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4<EFBFBD>) wake-up by 4-bit long address match
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WARNING: as both boards do not behave the same way, "BOARD_IN_STOP_MODE"
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compilation switch is defined in UART/UART_WakeUpFromStop/Src/main.c and must be
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enabled at compilation time before loading the executable in board 1 (that which
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is set in STOP mode).
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The stimuli-transmitting board (board 2) needs to be loaded with an executable
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software obtained with BOARD_IN_STOP_MODE disabled.
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At the very beginning, board 1 LED2 is ON then is turned off.
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This means that board 1 has entered STOP mode.
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Parallely, board 2 LED2 is quickly blinking (100 ms period). The user has
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just to wait for board 1 LED2 to be turned off then to press board 2 User push-button
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to send the first wake-up stimulus to board 1.
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This starts the test sequence and no more action is required from the user
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(a single User push-button press is needed to start the full 4 wake-up events
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test sequence).
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Board 1 LED2 behavior as described below allows to follow the
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test progress:
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ON ____ _______ _______ _______ ____
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OFF |________| |________| |________| |________|
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Enter Exit Enter Exit Enter Exit Enter Exit
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Stop Stop Stop Stop Stop Stop Stop Stop
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Mode Mode Mode Mode Mode Mode Mode Mode
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(RXNE flag) (Start Bit (7-bit add. (4-bit add.
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Detection) match) match)
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Simultaneously, board 2 LED2 behavior shown below allows to follow the
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test progress on the other side:
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BLINKING
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ON ****________ _______ _______ _______ ____
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OFF |________| |________| |________| |________|
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USER WkUp 2nd stim WkUp 3rd stim WkUp 4th stim WkUp LED ON
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button conf sent conf sent conf sent conf to mark
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pushed, rcv'ed rcv'ed rcv'ed rcv'ed passed
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1st stimulus test
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sent
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(RXNE flag) (Start Bit (7-bit add. (4-bit add.
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Detection) match) match)
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- If the test fails or if there is an initialization or transfer error, LED2
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transmits a sequence of three dots, three dashes, three dots.
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At the beginning of the main program the HAL_Init() function is called to reset
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all the peripherals, initialize the Flash interface and the systick.
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Then the SystemClock_Config() function is used to configure the system
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clock (SYSCLK) to run at 48 MHz.
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The UART is configured as follows:
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- BaudRate = 9600 baud
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- Word Length = 8 bits (8 data bits, no parity bit)
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- One Stop Bit
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- Parity none
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- Hardware flow control disabled (RTS and CTS signals)
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@note USARTx/UARTx instance used and associated resources can be updated in "main.h"
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file depending hardware configuration used.
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@note This example can not be used in DEBUG mode due to the fact that the
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Cortex-M0 core is no longer clocked during low power mode and so debugging
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features are not available.
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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 need 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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@par Directory contents
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- UART/UART_WakeUpFromStop/Inc/stm32f0xx_hal_conf.h HAL configuration file
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- UART/UART_WakeUpFromStop/Inc/stm32f0xx_it.h Interrupt handlers header file
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- UART/UART_WakeUpFromStop/Inc/main.h Header for main.c module
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- UART/UART_WakeUpFromStop/Src/stm32f0xx_it.c Interrupt handlers
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- UART/UART_WakeUpFromStop/Src/main.c Main program
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- UART/UART_WakeUpFromStop/Src/stm32f0xx_hal_msp.c HAL MSP module
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- UART/UART_WakeUpFromStop/Src/system_stm32f0xx.c STM32F0xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F0xx
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- This example has been tested with a couple of STM32F091RC-Nucleo RevC boards embedding a
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STM32F091RCT6 device and can be easily tailored to any other supported device
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and development board.
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- STM32F091RC-Nucleo RevC set-up
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- Connect a wire between 1st board PA.09 pin (connected to pin 21 on CN10)(USART1 Tx) and 2nd board PA.10 pin (USART1 Rx)
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- Connect a wire between 1st board PA.10 pin (connected to pin 33 on CN10)(USART1 Rx) and 2nd board PA.09 pin (USART1 Tx)
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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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