You seem to have CSS turned off. Please don't fill out this field. Dedicated especially for Linux users. Works in shell. There are plans to make a GUI overlay. Please provide the ad click URL, if possible:.[STM32] STM32F4 USB HOST + Pendrive: Writing to text file
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It is also called balenaEtcher since it is developed by balena. In addition, Etcher can flash directly Raspberry Pi devices that support usbboot. Use for.
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User Reviews Filter Reviews: All. Report inappropriate content.Do not be suprised if you only see a DFU device. This is normal.
Just compile and upload a blank sketch. However this is not the case. Normally manufacturers create composite USB devices in this case, i. But creation and certification of custom drivers for Windows is non-trivial and expensive.
This method allows the use of 2 separate Windows drivers — both of which come as standard on all Windows installations. Although the functionality of both DFU and USB Serial could have been included in the bootloader, it would make the bootloader and sketch core code libmaple more complicated, as the sketch would need to communicate with the bootloader in order to send and receive serial data.
So Leaflabs chose to go with the simpler option of the bootloader only containing the DFU functionality, and for the USB Serial to be compiled as part of the sketch.
Although this is the simpler option, its probably the best one, because if the Serial USB support was contained in the bootloader, the amount of additional code to allow the sketch to send and receive Serial via the bootloader would make the overall size of the bootloader and sketch slightly larger. Another consequence of splitting the functionality, is that if the sketch crashes, then the USB Serial will also crash, and often the USB Serial device will not appear at all.
And… any board that has been freshly installed with a bootloader, will only appear as a DFU device, because the bootloader checks to see if a valid sketch is in the program flash memory, and if not the bootloader continues to stay in DFU mode until a valid sketch has been upload.The following power supply configuration should be used:.
The following picture illustrates the hardware set-up:. The procedure described here explains how to install the bootable Linux image usbflash. Here is how you can build and install the bootable Linux image from the project sources usbflash. Contact Emcraft to obtain the bootable image and project source files. Note: The Linux image and the sample project have been built and validated in context of the Emcraft Systems Release 1. If you are using a different release, some porting changes may be needed.
Let's mount the FAT32 file system. As expected, it is empty at this point:. Let's "harvest" some data and store what is collected into a file on the USB Flash disk. In this demo, we emulate a data stream by taking a snapshot of the system time each second:. Note that the format of Windows and Unix text files differs slightly.
As a consequence, some Windows applications will not show the line breaks in Unix-format files. Assuming that data is stored in a text file vs a binary file and Windows is a data processing host, Linux data harvesting applications should take care of the difference by adding a carriage return character to data logs. Note further that you can hot plug your USB Flash device on the running system at any time:. It is important to understand that VFAT supports write-back in Linux, which means that file changes do not go to the physical media straight away and instead are cached in memory and go to the Flash at a later time.
The write-back creates a certain issue for embedded devices however. If the power to the device is shut down unexpectedly, or the USB Flash is unplugged without a proper unmount or sync, some of latest file changes may be lost. As it is typical with Linux, the issue can be handled in many ways.
Data synchronization can be ensured on a per-file, per-subtree, per-filesystem or system-wide basis.You seem to have CSS turned off. Please don't fill out this field.
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I want to write the variable counter to the flash and then read it as counter2. The first flash sector starts at 0x Displaying counter2 works and shows me the value of counter-1but it works only once. If I write again to the flash nothing seems to happen.
What is going on here? Can someone tell me why all variables change? Do I have to configure the linker? STM32 devices have flash on 0x and by erasing this sector, you did failure on startup because you erased actual part from where CPU loads instructions. Reading of counters is wrong. The best way is to create the new segment of flash in the linkescriptr and place the data there. It is the safest. If do not know linker scripts create a table of the one segment size, and place it at the end of the flash using your compiler directives.
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Viewed 12k times. Alex M. I do know HAL as it is one of the most ridiculous libraries I have seen but, changing this flash location is not too smart. Active Oldest Votes. I will treat you now as begineer, but will say sorry if you are not. When you tried to erase sectors, you did not specify how many sectors to erase.
I have put in the. NbSectors but now it wont run at all. Aug 8 '17 at Because you erased first sector where actual program is for code execution.If you want to place some code or data in your project into an external FLASH memory and access it from your code as if it was located in the normal FLASH memory, you need to do the following:.
This tutorial focuses on developing the FLASH driver; more information on configuring the project can be found in this tutorial. May 11, armstm If you want to place some code or data in your project into an external FLASH memory and access it from your code as if it was located in the normal FLASH memory, you need to do the following: Add the external memory via External Memories page of VisualGDB Project Properties Actually setup the memory mapping from your startup code so that the memory contents is accessible to your program Develop a FLASH driver that will automatically program the external memory when you start debugging your project This tutorial focuses on developing the FLASH driver; more information on configuring the project can be found in this tutorial.
Instead of configuring the driver, add the following lines to the main source file and start debugging the project as is:. InterruptEnabler enabler .There is something I do not understand so please let me ask a question. Before writing, is it necessary to "read two bytes anywhere on the flash and write the same data to the same place"?
I write and don't stick to the address. Is there any previous setting? No, this seems to be a totally unnecessary step. You think this why? Writing to 0x is something you'd want to avoid. You'd want to clear any pending errors. Erasing blocks you are currently executing from will likely crash the system.
Both Erase and Write are self timing, functions return when complete or on failure, check the status returned. The CPU will block if you execute code from the same flash bank you are erasing or writing. This will also limit realtime responsiveness of interrupts, etc.
If this is important run code from RAM, with vector table there too. To speed things up you might want to read the memory words to a ensure they are blank, b already contain the data you plan on writing. You would have to be really sure that the meaning of "the part where" is exactly the same to you on one hand, and the flash programming unit on the other. Odds are they're not. Just because you're not literally erasing the very branch of the code you're currently executing from under youreself, that doesn't mean that particular region is available for code to run in while an erase is in progress.
View all questions in Keil forum. Site Search User. Software Tools. Internal flash write using HAL function. If necessary, how much is its delay time? If so, what is the delay time? I wrote and it became OK. Reply Cancel Cancel. There are posting instructions for source code, read them. Up 0 Down Reply Accept answer Cancel. I want to rewrite the built-in flash to update the program by itself. Rewriting is not performed on the part where the program to be rewritten exists.
I'd like to ask if the above contents are necessary while updating that program. More questions in this forum. All recent questions Unread questions Questions you've participated in Questions you've asked Unanswered questions Answered questions Questions with suggested answers Questions with no replies.