2019-04-30 17:27:23 +01:00
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/**
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@page FMC_SRAM_PreInitConfig FMC PSRAM PreInit Config example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file FMC/FMC_PSRAM_PreInitConfig/readme.txt
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* @author MCD Application Team
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* @brief Description of the code execution from FMC PSRAM memory example.
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******************************************************************************
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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This example describes how to execute a part of the code from the PSRAM external memory.
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To do this, a section is created where the function is stored.
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The PSRAM is configured before to call main() function and the memory is then available
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after the system reset.
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The configuration of the PSRAM is done in the file system_stm32f4xx.c file in the
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function SystemInit_ExtMemCtl(). It is called by the function SystemInit(), which
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is the first function called by the Reset_Handler.
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The code in executed in a forever loop. It is a LEDs toggling example, with some
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code mapped in the PSRAM and other in Flash, to show the jump from one memory
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to the other.
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When a power-off is performed, the PSRAM memory content is corrupted.
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LED3, and LED4 toggle in this forever loop.
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In this example, HCLK is configured at 100 MHz.
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The configuration of the Clock is done in the system_stm32f4xx.c by calling SetSysClk().
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A specefic flashloader is required for the programming of the PSRAM memory.
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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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2020-02-27 12:23:58 +01:00
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@par Keywords
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Memory, FMC, PSRAM, PreInit, Execute, Initialization, Access
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2019-04-30 17:27:23 +01:00
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@par Directory contents
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- FMC/FMC_PSRAM_PreInitConfig/Inc/stm32f4xx_hal_conf.h HAL configuration file
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- FMC/FMC_PSRAM_PreInitConfig/Inc/stm32f4xx_it.h Interrupt handlers header file
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- FMC/FMC_PSRAM_PreInitConfig/Inc/main.h Header for main.c module
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- FMC/FMC_PSRAM_PreInitConfig/Src/stm32f4xx_it.c Interrupt handlers
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- FMC/FMC_PSRAM_PreInitConfig/Src/main.c Main program
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- FMC/FMC_PSRAM_PreInitConfig/Src/system_stm32f4xx.c STM32F4xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F413xx/STM32F423xx devices.
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- This example has been tested with STM32F413H-DISCO board and can be
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easily tailored to any other supported device and development board.
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- STM32F413H-DISCO Set-up :
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Board is configured by default to access PSRAM external memory
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- A specific region for the PSRAM memory has been added in the scatter file
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(STM32F413xx/STM32F423xx for IAR toolchain,
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STM32F413H-DISCO.sct for Keil toolchain and linker file for SW4STM32)
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The PSRAM external flash loader is not integrated with supported toolchains, it<69>s only supported with STM32
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ST-Link Utility V4.0.1
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To load the example, use STM32 ST-Link Utility to program both internal Flash and external PSRAM memory:
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1- Open STM32 ST-Link Utility V4.1.0, click on "External Loader" from the bar menu then check
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"IS66WV51216EBLL_STM32413-DISCO" box
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2- Connect the STM32F413H-DISCO board to PC with USB cable through CN2
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3- Use the generated file named "STM32F413H-DISCO.hex" with STM32 ST-Link Utility
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to program both internal Flash and external PSRAM memory
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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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