fatfs | Standalone FAT16/FAT32 filesystem implementation | Database library
kandi X-RAY | fatfs Summary
kandi X-RAY | fatfs Summary
A standalone FAT16/FAT32 implementation that takes in a block-access interface and exposes something quite similar to require('fs') (i.e. the node.js built-in Filesystem API).
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QUESTION
One of my clients asked me to play sound from an SD card. But file selection should be random because the device is used to scare animals in the field(animals should not get used to sound pattern). I can generate random numbers by
...ANSWER
Answered 2021-May-13 at 07:18The simplest solution would be to move all files into a single directory and name each file in a sequence starting from zero. Getting a random files name would then be as simple as:
QUESTION
Already thanks for your time.
I'm a little lost on how can I debug a problem I have with FatFs: write then read files inside folder brings me invalid data. but on the root, it work flawessly.
note:
- I'm working on a bar-metal nrf52832 using FatFs 14.
- The nrf52832 talk on spi to an external flash MX25L32 (4Mb, 512b/sector, 4096/block)
- I have disabled the relative file path, so I use only absolute path.
- (I'll join "ffconf.h")
I have the following problem :
- If I write then read a file on the root, it work flawlessly (tested with 10k file)
- If I write then read a file in a subfolder I read somethings strange (even with small file).
and here's the code that I use (cb_littlecodethatfail is called via an RTT terminal):
...ANSWER
Answered 2020-Jul-29 at 08:42It's me again,
The bug is inside the glue 'disk_write' function. As long as block was written in the right order, everythings worked well. But it's not always the case.
sorry for my noobness, here's the implementation actual of the disk_write
QUESTION
I run some command before the actual build
...ANSWER
Answered 2020-Aug-16 at 09:35It looks like ninja is checking dependencies before the actual build starts and ignores meanwhile file change
Hey! Yes. Because DEPFILEs from C source files are generated at the same time as they are compiled, cmake has no way to know beforehand which file depends on which. It would have to do two passes - first to get dependencies and then to compile (which would be a nice feature, but actually hard to implement). It happens in one pass during compilation (-MD -MT flags), so cmake has no way of knowing that one file depends on that header. I also advise:
- Do not modify files in your source tree. Keep all changes in BINARY_DIR.
- Do not modify files. Generate new files. It's easier and generally, less state = less problems.
Try it such:
QUESTION
I need to write a program for a STM32 MCU with C and FATFS, to find the newest file among unknown number of files. Files names contain their creation dates, the numbers in the file name are separated with "_". for example: oil_sensor_22_07_20_13_15.csv
I have written a code to extract date and time from the files and to calculate their time difference. But I don't know how to find the newest file among all the files.
I include the code which calculates the time difference between two files and the code which finds the newest file among two files.
The function to calculate the time difference between two file names:
...ANSWER
Answered 2020-Jul-23 at 09:31The algorithm is pretty simple, pseudocode below:
QUESTION
I can't read uint data(in text file) from sdcard which has been written from stm32 adc. I am able to write data to sd card but weird symbols appear when I open txt file in my latop.
I am using SDIO and FATFS
...ANSWER
Answered 2017-Nov-28 at 13:25if(f_mount(&myFAT,SD_Path, 1)==FR_OK)
{
HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_14);
f_open(&myFile, "test1.txt\0",FA_WRITE|FA_CREATE_ALWAYS);
for(int i=0; i<1000;i++){
sprintf(msg,"%hu\r\n",data[i]);
f_write(&myFile,msg,10,&byteCount);
}
f_close(&myFile);
HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_15);
}
QUESTION
in my labor, I can't reproduce the error. It occurs only in the "Field". I have built a logging device which is logging the data of a GPS and the incremental sensors of a robot.
After 2 / 3 minutes of logging, it stops. Every time there is a logging amount of around 175kB of data. Do you have any idea of searching or debugging this error? Debugging is easy in a good environment like the labor, but how can I debug it in "field" / on the road?
I am using an STM32F407 controller with FatFS and SDIO for connecting the 8 GB micro SD-Card. The Gps (linx-receiver) and the incremental sensor are connected via UART.
...ANSWER
Answered 2020-Jan-20 at 06:44In the Old days I had some problems with a FatFS version... It seems that it needed to be compiled with optimization level -O2.
Also, check for buffer overflows and critical regions in your code.
Another thing can be from the power source, SD cards tend to consume a lot of power when the sectors are closed, use in the field a big battery with lots o capacitors for noise removal.
QUESTION
how it is possible to detect the removed SD-Card, and after that how it is possible to detect the inserting and do the re-mounting? I am working at STM32-F401 in C and with fatfs. Detecting incorrect mounting or removed card is relatively easy:
...ANSWER
Answered 2020-Jan-08 at 13:26You can't do it from this level. SD interface has line CD - CardDetect. You should connect it to GPIO and test it in the timer interrupt (EXTI interrupts are not good for that as debouncing is needed)
QUESTION
I am now using CubeMx 4.23.0 and FW package for STM32F7 1.8.0 MCU is STM32F746 on Core746i board. Everything is generated by CubeMx automatically.
main.c:
...ANSWER
Answered 2018-Oct-05 at 09:25You can try
`f_mount(0, "path", 0);
` after the f_open call . it may work. If the function with forced mounting failed with FR_NOT_READY, it means that the filesystem object has been registered successfully but the
volume is currently not ready to work
. The volume mount process will be attempted on subsequent file/directroy function.
If implementation of the disk I/O layer lacks asynchronous media change detection, application program needs to perform f_mount function after each media change to force cleared the filesystem object.
QUESTION
I am using the FatFs library to create and manage a file system on an SD card. The goal is to identify a file containing the firmware for the bootloader to update (or not) the device.
The procedure im following is the follwing:
...ANSWER
Answered 2019-Nov-11 at 10:48- Always read the documentation.
Description
After the directory specified by path could be opened, it starts to search the directory for items with the name specified by pattern. If the first item is found, the information about the object is stored into the file information structure fno.
The matching pattern can contain wildcard characters (? and *). A ? matches an any character and an * matches an any string in length of zero or longer. When support of long file name is enabled, only fname[] is tested at FF_USE_FIND == 1 and also altname[] is tested at FF_USE_FIND == 2. In this revision, there are some differences listed below between FatFs and standard systems in matching condition.
QUESTION
I'd like to present some data on a microcontroller (STM32L4xx) to appear as though it was a single file on a filesystem mounted over USB to a host PC. I have functions that can produce the data at any requested offset in the (emulated) file. The file can be read only, there is no reason to write to it; and it can have a fixed name and size.
This is pretty much the opposite use case of Chan's FatFS and similar libraries: I don't have a real filesystem, and I don't want to access a filesystem, I just want to do whatever is necessary to present an emulated (fake) filesystem (with a single file) to the USB host.
I think bootloaders that appear as a mass storage device (eg Mbed) must do something similar, since the program data (probably) isn't written to a real filesystem when you drag and drop a hex file onto what looks like the Mbed storage device; I imagine it is stored somewhere but not in an actual filesystem as the one that is visible.
Could anyone point me to some sample code along these lines?
...ANSWER
Answered 2019-Sep-30 at 16:25Because there is only one fixed length file, you don't have to bother much with the filesystem structure, but create it once on a PC, and treat it as a fixed header. The device needs no FatFS code at all. A file on an otherwise empty FAT filesystem will be stored contiguously from the first free sector onwards.
First, let's create a minimal FAT filesystem image, e.g. using the mtools package on linux.
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