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84 lines
3.5 KiB
Plaintext
84 lines
3.5 KiB
Plaintext
/**
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@page FMC_SRAM FMC PSRAM memory basic functionalities use example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file FMC/FMC_PSRAM/readme.txt
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* @author MCD Application Team
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* @brief Description of the FMC PSRAM example.
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******************************************************************************
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*
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* Copyright (c) 2017 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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This example describes how to configure the FMC controller to access the PSRAM
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memory.
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The PSRAM is IS66WV51216EBLL-55BLI.
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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 100 MHz.
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The goal of this example is to explain the different steps to configure the FMC
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and make the PSRAM device ready for access, without using the MSP layer.
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In this example, the SRAM device is configured and initialized explicitly
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following all initialization sequence steps. After initializing the device, user
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can perform read/write operations on it. A data buffer is written to the PSRAM
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memory, then read back and checked to verify its correctness.
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If the data is read correctly from PSRAM, the LED3 is ON, otherwise the LED4 is ON.
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In case of HAL initialization issue, LED4 will be ON.
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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 Keywords
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Memory, FMC, PSRAM, Read, Write, Initialization, Access
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@par Directory contents
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- FMC/FMC_PSRAM/Inc/stm32f4xx_hal_conf.h HAL Configuration file
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- FMC/FMC_PSRAM/Inc/main.h Header for main.c module
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- FMC/FMC_PSRAM/Inc/stm32f4xx_it.h Header for stm32f4xx_it.c
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- FMC/FMC_PSRAM/Src/main.c Main program
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- FMC/FMC_PSRAM/Src/stm32f4xx_hal_msp.c HAL MSP module
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- FMC/FMC_PSRAM/Src/stm32f4xx_it.c Interrupt handlers
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- FMC/FMC_PSRAM/Src/system_stm32f4xx.c STM32F4xx system clock configuration 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-Discovery board and can be
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easily tailored to any other supported device and development board.
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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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