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Stm32 fmc sdram example


net STM32F4 sdram configuration. 我来回答. The main interface between the logiFMC-FPD-III-C daughter card and the connected cameras is the FPD-Link III (Flat Panel Display Link). SDRAM_FMC. 0\Projects\STM32F769I_EVAL\Examples\FMC\FMC_SDRAM stm32f429 Datasheet (SDRAM, ILI9341, HAL, Ref,Programming 메뉴얼, DMA컨트롤러 ) (0) 2019. 50ps of skew is acceptable in most STM32 SDRAM PCB layouts, but lower the skew – the better it is. Networking and Motor Control daughter card. stm32f4xx_hal_ppp. Here is some notes about playing with SDRAM. For SDRAM, it is the command sequence that need to be issued after initializing the FMC module. g. In order to access the sd card, I would use SPI. 所有亮答 数量:1. STM32 reference boards with embedding LTDC FMC SDRAM and Examples 18. 选择文件 文件大小不超过15M(格式支持:doc、ppt、xls、pdf、zip、rar、txt). I'm posting because I can access the memory, I can write and read from it, but on certain addresses there is an offset/shift. If a STM32F7xx microcontroller is used with an external SDRAM, the Cortex-M7 core may unexpectedly run into the hard fault handler because of an unaligned access. The setting is an 8-bit data bus, a 13-bit address, 4 b STM32 Flexible Memory Controller (SDRAM controller). 0\Projects\STM32F769I_EVAL\Examples\FMC\FMC_SDRAM ARM Cortex STM32: FMC init SDRAM for STM32F429 › Best Education From www. -X FMC_SDRAM_LowPower This example guides the user through the different configuration Подключение внешней SDRAM к stm32 через FMC. FPU Crypto FMC_SDRAM_DataMemory This example guides the user through the different configuration steps by mean of HAL API to configure the FMC controller to access the IS42S32800G SDRAM memory mounted on STM327x6G-EVAL revB evaluation board (including heap and stack). Подключение внешней SDRAM к stm32 через FMC. There are device tree (DTS) for stm32429i-eval, stm32746g-eval, stm32f429-disco, stm32f469-disco, stm32f746-disco, stm32f769-disco, stm32h743i-disco and stm32h743i-eval. bss). h Header file of the main driver C file It includes common data, handle and enumeration structures, define statements and macros, as well as the exported generic APIs. RT-Thread-TouchGFX快速移植教程本文为原创文章,首发平台为oshwhub. Finally using the F769 means I would have access to all the code and examples created for all the demo boards that use this device. - libopencm3-examples/sdram. I modified settings for our board and make a simple library. After resolving this issue, it should be about configuring FMC module for using SDRAM (in STM32CubeMX for example) and the RAM will be available at some memory location according to the MCUs memory layout. Each memory controller type ( Sdram, Nand (todo), . . In Standard Peripheral libraries pack is also included FMC example for SDRAM. STM32F746G-DISCO Board with FreeRTOS + Nabto. h. Example: stm32f4xx_hal_adc. 2. FMC examples. The latest errata sheet lists a total of 15 “silicon limitations”. VisualGDB will program the FLASH memory and start your STM32 MCU series High Perf MCUs Example of block diagram STM32H735xG 13 FMC Connecting parallel flash, SDRAM, PSRAM 其中 t rp 、 t rfc 、 t mrd 等時間參數跟具體的 sdram 有關,可查閱其數據手冊獲知,stm32 fmc 訪問時配置需要這些參數。 SDRAM 的讀寫流程 初始化步驟完成,開始讀寫數據,其時序流程見圖 26-11 及圖 26-12 。 ARM Cortex STM32: FMC init SDRAM for STM32F429 › Best Education From www. -X FMC_SDRAM_LowPower This example guides the user through the different configuration /** ***** * @file stm32f4xx. I just had to copy the relevant functions and constants: void HAL_SDRAM_MspInit(SDRAM_HandleTypeDef *hsdram) SDRAM problems with STM32F427/437/429/439. // Check if the DMA Stream is disabled before enabling it. 虽然跟FSMC相比,FMC只是少了一个S,但应用难度可是大大增加了。. FMC peripheral is used for driving SDRAM. 0\Projects\STM32F769I_EVAL\Examples\FMC\FMC_SDRAM Thanks for the answer , but the problem is that i would like to use the old chip with new SDRAM. Flexible Memory Controller & Flexible Static Memory Controller (FMC/FSMC)# In addition to the support of the static RAM, the FMC adds dynamic RAM support (SDRAM) to the FSMC. After this was complete, the SDRAM was accessible and running well. SFR SDRAM system_stm32f429. o (. Example of graphic implantations with STM32 in different hardware configurations . h stm32 FMC SDRAM 输入关键字,在本站238万海量源码库中尽情搜索: 帮助 [ 515_demo_vc. This is an updated version of a previous post incorporating our Cloud Console. Hi there! I've made myself a board with an STM32, some ADC/DAC and an SDRAM, specifically the "is42s16400j" as I believe one of the discovery boards has. 莱克迷KW. It's specified in the Scatter File as a SIZE, not by an end address. 对于连接片外RAM而言,FSMC接的是静态RAM,FMC接的是动态RAM,而控制动态RAM要复杂得 STM32 Solution for Graphics •STM32 offers a unique graphical capability in the Cortex-M based MCU perimeter • Real TFT Controller for optimum display control • External memory interface to connect both Flash for static content and SRAM or SDRAM for dynamic content and frame buffer The Ultra-Low-Power (STM32 L0, STM32 L1, STM32 L4, STM32 L4+ and STM32 L5) The Main stream (STM32 F0, STM32 F1, STM32 F3 and STM32 G0) The High Performance (STM32 F2 STM32 F4, STM32 F7 and STM32 H7) Regardless of the external 8-bit/16-bit/32-bit wide device, FMC_A[0] is always connected to the external device address A[0], HADDR[27:26] setting, yes Need our intervention, for example, when you use the first bank of Bank1, that is, when you use FMC_NE1 to connect to external devices, it corresponds to HADDR[27:26]=00, and then we need to Address A16, A17 Data FMC [7:0] FMC_A[25:0] NOR/PSRAM FMC_D[31:0] memory FMC_NOE controller FMC_NWE FMC_NWAIT 0x3FFFF Address A17:16 [0b1x] NAND FMC_NCE 0x20000 Section memory controller FMC_INT 0x1FFFF A17:16 [0b01] Command 0x10000 Section SDRAM memory controller A17:16 [0b00] 0x0FFFF Data 0x00000 Section NAND address mapping 92 25. In our case it is stm32f7xx_ll_fmc. 21 STM32CubeMX and SDRAM. ) provides both new and new_unchecked methods. our STM32 product portfolio offers devices that are pin‑to‑pin and software compatible with the STM32 F2 series, but with more performance, DSP capability, a floating point unit, more SRAM, and peripheral improvements such as a TFT LCD controller with graphics acceleration, SDRAM, serial audio interface, less than 1 μA RTC and 2. 0. Onboard 64M Bit SDRAM; All the I/O ports are accessible on the pin headers The STM32F746G-DISCO board comes with the STM32 comprehensive software HAL library together with various packaged software examples, as well as a direct access to mbed online resources. SDRAM library Features. The older F40x series have the more limited FMC, F42x and up have FMC. The FMC banks are arranged as 4x64Mb (banks 1,2,3,4) with the following base addresses: bank 1: 0x60000000 bank 2: 0x64000000 bank 3: 0x68000000 bank 4: 0x6C000000 It's confusing that ST refer to the 64Mb ranges as banks themselves when they are really sub-banks of the larger bank #1 that's allocated to NOR/PSRAM. 10. Operates with external 64Mb SDRAM; Functions to read/write 8, 16 or 32bit variable at a time; Version 1. fmc_bank2_sdram ——》sdram芯片连接的是stm32主芯片的fmc_sdcke1和fmc_sdne1两个引脚; fmc_bank2_sdram ——》sdram芯片连接的是stm32主芯片的fmc_sdcke0和fmc_sdne0两个引脚; 因为硬件连接的是bank2,所以软件fmc_bank选择fmc_bank2_sdram. The STM32 maintainer Git repository was mcoquelin (kernel. The STM32F429ZIT6 works with 64Mbit SDRAM just finde, but my old chip is designed to share it's memory (30pin SIMM) with an M68k. arm-stm. What I want to do is to save this data into the SDRAM or SD card as a file. We will use OpenOCD with the on-board ST-Link interface: Press “Finish” to create your project and build it using the Build Solution command: Press F5 to start debugging. So 0xD0000000 0x400000. I think it would be cool to use the STM32H745 which is the M7/M4 combo core. 相关搜索: STM32F429 429 SDRAM STM32F429x. STM32F746NGH6 microcontroller featuring 1 Mbytes of Flash memory and 340 Kbytes of RAM, in BGA216 package. 0\Projects\STM32746G-Discovery\Examples\FMC\FMC_SDRAM\SW4STM32. FMC是高级的FSMC,是可以支持SDRAM的接口。. This means that we need to include stm32f7xx_ll_fmc. STM32 Flexible Memory Controller (SDRAM controller). For example, one said that interrupts in cpu cause data loss and I must find FPGA or CPLD. The display interface (LTDC or DSI), RAM (SDRAM - FMC) and flash (QUADSPI) make up the hardware requirements to run TouchGFX. When working with STM32 ARM Cortex-M microcontrollers, the free embedded software STM32Cube from ST provides all necessary drivers and a collection of middleware components to reduce the initial development effort. I was missing to program the SDRAM chip. This is how some Linux systems do it. 关于SDRAM存储器,请参考前面的“常用存储器介绍”章节,实验中SDRAM芯片的具体参数,请参考其规格书《W9825G6KH》来了解。. 3: Optimizing the LTDC framebuffer fetching from SDRAM. STM32 F4 family have build in FMC controller that can be configured to use SDRAM with easy. Functions for read/write are now defined as macros. The commands can be delivered to the two banks simultaneously using Configure Target Bank bits CTB1 and CTB2 in FMC_SDCMR register. 1 – November 23, 2014. com). use stm32_fmc :: { AddressPinSet, PinsSdram, Sdram, SdramChip, SdramPinSet, SdramTargetBank SDRAM library was designed to be used on STM32F429-Discovery, STM32F439-EVAL and STM32F7-Discovery boards. Examples 18. But I wonder if there is any issue in this process. bootloader transfers main application from, say, an SD card to SDRAM. 01 On the next page select the LCD Demo sample: On the last page of the wizard select the debug method you want to use. The table shows the supported commands. the STM32F429DISC build includes support for SDRAM, and puts the heap there. (Maybe somehow using FMC ?) Another approach I was thinking of, is to use all 6 SPIs on STM32F7 with six dual channel ADCs. bootloader sets the program counter (PC) to the SDRAM memory location, and run the main application run. Key Features. Core746I is an STM32 MCU core board designed for STM32F746IGT6, supports further expansion. // enabled, then disabled then re-enabled 其中 t rp 、 t rfc 、 t mrd 等時間參數跟具體的 sdram 有關,可查閱其數據手冊獲知,stm32 fmc 訪問時配置需要這些參數。 SDRAM 的讀寫流程 初始化步驟完成,開始讀寫數據,其時序流程見圖 26-11 及圖 26-12 。 Core746I is an STM32 MCU core board designed for STM32F746IGT6, supports further expansion. h,stm32f4xx_hal_irda. It uses the FMC layer functions to interface with SDRAM devices. STM32F427/9 has this nice FMC module, which stands for Flexible Memory Controller. This problem does not occur when read accesses are performed by another master or when FMC accesses are done when the interrupts are disabled. F4 have 2 internals banks and memory ranges where SDRAM could be configured. So you can use external RAM (eg. STM32 reference boards with embedding LTDC FMC SDRAM and The blue pill is one of the models which does not support FSMC, so no matter how you connect external SRAM, it will never be possible to use it transparently as part of the memory space (stack/variable storage). h: /** * @brief Initializes the SDRAM device. The problem is that it outputs data on 8 serial lines @ 100MHz. pub Issue with FMC/SDRAM in STM32F427. So i would like to replace the 30pin SIMM with SDRAM and the 68k with an STM32 to work with the old chip. On-board ST-LINK/V2-1 supporting USB re FMC (SDRAM, NOR, NAND) Memory Interfaces Cortex-M7 400 MHz MPU ETM 2x16KB Cache Master DMA + 2xDMA + BDMA Embedded memories Up to 2-Mbyte Flash Dual Bank with ECC Up to 864KB byte RAM with ECC Chrom-ART Accelerator™ 192KB RAM TCM with ECC 4KB Bckup RAM 4KB Debug RAM Q-SPI dual mode JPEG codec 2xSD/SDIO/MMC Accelerators Double Prec. SPI RAM), but you will need to add your own code to page it in and out. Expected result; Download example and reset, information are printed to serial port This is STM32 What I want to do is to save this data into the SDRAM or SD card as a file. It is able to deal with all kinds of memories. L6406E: No space in execution regions with . This is the maximum amount of data that the LCD can fetch under these conditions. c at master · libopencm3/libopencm3-examples Re: SDRAM with FMC - STM32 Post by dflogeras » Thu Dec 14, 2017 2:48 pm I found one source of problem, the STM32F769I-Discovery board. The timing configuration is important as well a It's specified in the Scatter File as a SIZE, not by an end address. When the FMC is used as stack, heap or variable data, an interrupt occurring during a CPU read access to the FMC may results in read data corruption or hard fault exception. 1. 04 [STM32F429]DMA와 GPIO를 활용한 고속 병렬 통신 (0) 2019. 15. ARM Cortex STM32: FMC init SDRAM for STM32F429 › Best Education From www. zip ] - PM515采集卡VC++6. h doesn't set up FMC_SDCLK as ALTERNATE 12, it is set as a normal floating input. It is ideal for starting application development with STM32F family. Two of them are connected to SDRAM and are particularily ugly, as they may result in corrupt reads. This crate is a work in progress! Contributions very welcome. \CubeMxRepository\STM32Cube_FW_F7_V1. The SDRAM itself also needs some information on timing and refresh FMC init SDRAM for STM32F429. Compact and effective interface for advanced networked motor and motion control systems. For the convenience of users, you may want to wrap these with your new method, so that each memory can be created from the peripheral in one step. 25. The following sequence should be followed to configure the FMC to interface with SDRAM memories: (#) Declare a SDRAM_HandleTypeDef handle structure, for example: SDRAM_HandleTypeDef hdsram (++) Fill the SDRAM_HandleTypeDef handle "Init" field with the allowed values of the With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world. It is worth to note that while settings are independent, some are shared or are required to be set according to the most constraining device. Then use 6 DMA channels to store data in SDRAM. 谢谢您的回复! 问题找到了:FMC读写数据这两个函数的问题 显示格式是RGB888的,于是在SDRAM里像素是24位的,与32位的AHB接口之间存在一个转换过程,来来回回的读写造成了“AHB总线冲突”,现在改成ARGB8888格式了,alpha填充0xFF就好了,这样读写像素的速度就提高了若干倍,目前显示"hello, world"和 STM32 Solution for Graphics •STM32 offers a unique graphical capability in the Cortex-M based MCU perimeter • Real TFT Controller for optimum display control • External memory interface to connect both Flash for static content and SRAM or SDRAM for dynamic content and frame buffer Проблема связки STM32F429 + SDRAM ARM, Cortex, STM32 Решение и ответ на вопрос 2090431 It has 8 simultaneously sampled channels at 1. 4 MSPS ADCs. The 100pin version does have FMC but doesn't support SDRAM. org) until 4. A suitable SDRAM for storing two framebuffers running a 24bpp 800*480 resolution would be a 32 Mbits SDRAM as a double framebuffer strategy requires ~18Mbits of RAM. c. A FMC interrupt can cause the device to exit Sleep mode. With single define, library will know which board is used and which settings should use to get proper working for RAM. // enabled, then disabled then re-enabled FMC for STM32 in muxed mode: After using the stm32 to communicate with BMP280 through IIC , I have some question about BMP280. Rust by Example Rust Cookbook -> Sdram<FMC, CHIP Peripherals that have this trait must have the /// same register block as STM32 FMC peripherals. blogspot. 5 sdram芯片初始化 在其它系列的 STM32 控制器中,只有 FSMC 控制器 (Flexible Static Memory Controller) ,译为可变静态存储控制器,所以它们不能驱动 SDRAM 这样的动态存储器,因为驱动 SDRAM 时需要定时刷新, STM32F429 的 FMC 外设才支持该功能,且只支持普通的 SDRAM ,不支持 DDR 类型的 SDRAM 。 On STM32, the FMC supports SRAM and SDRAM, the FSMC only supports SRAM (hence the "S"). I plan to connect SDRAM from MICRON MT48LC series ( datasheet. The FMC peripheral supports up to 2 external SDRAM devices. h * @author MCD Application Team * @version V1. 3. 上传资料:. FMC. Von themole in ARM, SDRAM, STM32 Schlagwort Clean Code, CubeMX, HAL, SDRAM, STM32, STM32CubeMX. // enabled, then disabled then re-enabled our STM32 product portfolio offers devices that are pin‑to‑pin and software compatible with the STM32 F2 series, but with more performance, DSP capability, a floating point unit, more SRAM, and peripheral improvements such as a TFT LCD controller with graphics acceleration, SDRAM, serial audio interface, less than 1 μA RTC and 2. Try not to push your luck to the boundary with inconsistent layout and length matching. If you use it in the linker, then you'd had better initialize the external memory interface and SDRAM in the SystemInit() routine so the C run time code can copy statics into the SDRAM STM32硬件基础--FMC读写片外SDRAM. // enabled, then disabled then re-enabled /** ***** * @file stm32f4xx. Next we right click on the missing type, in this case FMC_SDRAM_CommandTypeDef and select Open Declaration. 63 Table 17. Example:stm32f4xx_hal_adc. See full list on main. It doesn't have to be sequence of files, because I need just one frame. The pin connection diagram is automatic generate by STM32CubeMX ( STM32H743 ). Minimal ready-to-run system, integrates clock circuit, USB power management, USB connector, etc. The FMC is active in Run and Sleep modes. The FMC SDRAM controller can be used to interface with external SDRAM memories. STM32F407 software trigger a one pulse timer using HAL: STM32F4 - Radiolink SE100 GPS: Tap on the LCD does not respond FMC card for video development systems requiring up to 5 cameras. s stm32f4xx_ltdc. And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Corte Rust by Example Rust Cookbook -> Sdram<FMC, CHIP Peripherals that have this trait must have the /// same register block as STM32 FMC peripherals. It is working now. // enabled, then disabled then re-enabled In this case, the DMA Stream disable. 在前一篇文章《 STM32硬件基础--FSMC 》中讨论了FSMC的基本用法,今天来说说FMC。. Onboard 64M Bit SDRAM. Usage SDRAM. Up to 2 SDRAM banks are supported with independent configuration. txt with content "This is STM32 working with FatFs" was created The blue pill is one of the models which does not support FSMC, so no matter how you connect external SRAM, it will never be possible to use it transparently as part of the memory space (stack/variable storage). It includes the APIs that are common to all STM32 devices. SDRAM_FMC FMC read SDRAM you will find that a new file STM32cube. The device is not able to perform any communication in Stop and Standby modes. I found a working example with STM32CubeIDE in folder STM32Cube\Repository\STM32Cube_FW_F7_V1. 这两种外设接口区别再哪里,是否有兼容的部分显示全部. 8MB (64Mbit) on Discovery board is quite a bit, but it can hold only 1 raw 5 megapixel image, perhaps multiple JPEGs. This may happen for example when the frame buffer of a LCD, a RAM filesystem or any other data is located into the SDRAM address range 0xC0000000 - 0xC03FFFFF (max. 09. SDRAM 本小节以型号为“w9825gkh-6”的sdram芯片为stm32扩展内存。它的行地址宽度为13位,列地址宽度为9位,内部含有4个bank,数据线宽度为16位,容量大小为32mb。 学习本小节内容时,请打开配套的“fmc—读写sdram”工程配合阅读。 SDRAM densities typically come in 16 Mbits up to 512 Mbits, available in 8, 16, and 32 bit interfaces, running frequencies between 100-200 MHz. 5Msps. com. 6 but is now atorgue (kernel. FMC read SDRAM. chm》。. 而 fmc_sdcke 线和fmc_sdne 都各有 2 条,fmc_sdcke 用于控制 sdram 的时钟使能,fmc_sdne 用于控制 sdram 芯片的片选使能。 它们用于控制 STM32 使用不同的存储区域驱动 SDRAM,使用编号为 0 的信号线组会使用 STM32 的存储器区域 1,使用编号为 1 的信号线组会使用存储器区域 2。 The STM32 products provide different memory controller peripherals to interface with the NOR, NAND, SRAM, SDRAM, LPSDR SDRAM, and PSRAM memories. com 和 RT-Thread社区,作者为micespring,转发请保留此内容。前言 TouchGFX是专为STM32系 FMC_SDRAM_DataMemory This example guides the user through the different configuration steps by mean of HAL API to configure the FMC controller to access the IS42S32800G SDRAM memory mounted on STM327x6G-EVAL revB evaluation board (including heap and stack). Simple example projects showing how to use libopencm3. It is not enough to simply setup the FMC—one must also communicate to the SDRAM how it should be setup for operation. ANY selector matching guidrv_stm32f429i_discovery. st. FMC—扩展外部SDRAM ¶. // enabled, then disabled then re-enabled The SDRAM read throughput in Table 2 is the measured throughput for continuous read bursts from a 32-bit wide single data rate (SDR) SDRAM with a CAS latency of two clocks us ing the SDRAM controller on the ColdFire MCF532x processor. . It is important to ensure that all transmissions are completed before the FMC controller is disabled or the domain or system is switched down to Stop or Standby modes. org). 发布于 2020-10-10. 0 0 收起. See full list on stm32f4-discovery. 04 [STM32F429]FMC(Flexible Memory controller) 구성 및 설정(cube) (0) 2019. 本章参考资料:《STM32H750用户手册》、《STM32H750xB规格书》、库帮助文档《STM32H753xx_User_Manual. 5. "E" or "ES" marking examples of location: • On the targeted STM32 that is soldered on the board (for illu stration of STM32 marking, refer to the section "Package information" of the STM32 datasheet at www. Education FMC init SDRAM for STM32F429. Hardware Abstraction Layer for STM32 Memory Controllers (FMC/FSMC) Currently only SDRAM functions are implemented. Implementing (If your HAL already implements FMC, you can skip this) See the docs. 04 [STM32F429]FSMC(LCD INTERFACE), DCMI 보충내용 (0) 2018. The FMC (flexible memory controller) of these microcontrollers is a bug ridden beast. 0驱动,用于PM515采集卡数据采集 Core746I is an STM32 MCU core board designed for STM32F746IGT6, supports further expansion. 16. On my board, whenever I write to any SDRAM address, only the first byte is READ/WRITTEN to, for example when I write 0x00 to address 0xC0000000, the data at that address when monitored under debugging contains 0x48129100 i. h inside stm32746g_discovery_sdram. E. That's probably not possible to read out using STM32. This opens the file in which this type is defined. 4 In this video I go through the process of configuring the FMC interface for communicating with external SDRAM. 0RC2 - edited by Keil * @date 20-February-2013 * @brief CMSIS Cortex-M4 Device Peripheral Access Layer Header File. lv SDRAM controller can issue different commands to the SDRAM devices: The commands are issued by software to initialize the SDRAM device, or to switch the device mode. Sometimes, using CubeMX and the HAL, there is something missing. Some parts are still unclear for me but looks like all code works. * @retval SDRAM status */ void BSP_SDRAM_Init(void) { SDRAM_HandleTypeDef sdramHandle; FMC_SDRAM_TimingTypeDef Timing Example of graphic implantations with STM32 in different hardware configurations . After some more looking through the example I found there was a board-specific memory initialization function that needed to be run. // enabled, then disabled then re-enabled these engineering sample tools as reference design or in production. c, stm32f4xx_hal_irda. Usually, the SDRAM is mapped in to the memory map so you can "just" write and read from it like normal memory. Each external device is accessed by means of a unique chip select. The default configuration file for STM32 is stm32_defconfig. pub Consult the AC timing section of the SDRAM datasheet to find out the maximum allowable skew across signal lines. Onboard 64M Bit SDRAM; All the I/O ports are accessible on the pin headers MPU configuration example: FMC_SDRAM In this configuration example, the double framebuffer technique is used; the frontbuffer is placed in the SDRAM bank1 while the backbuffer is placed in the SDRAM bank2 with respect to the SDRAM bandwidth optimization described in Section 4. For now I want to add external SDRAM to my project to hold large(ish) amount of data captured by sensors (images) for later retrieval over slower UART. Stm32h7 memory map STM32 Flexible Memory Controller (FMC). e first 3 BYTES are random garbage and only the last byte is written correctly(0x00), and suppose If i write 0xAA to the stm32-fmc. SYMPTOM. If you use it in the linker, then you'd had better initialize the external memory interface and SDRAM in the SystemInit() routine so the C run time code can copy statics into the SDRAM Board index Support Section STM32 Support Driving a LCD display with FMC on a STM32F429 ChibiOS public support forum for topics related to the STMicroelectronics STM32 family of micro-controllers. The FMC allows to interface with static-memory mapped external devices such as SRAM, NOR Flash, NAND Flash, SDRAM All external memories share the addresses, data and control signals with the controller. // has been cleared by hardware. 15mm of unmatched length causes ~1ps of skew.