Skip to main content
A
Anonymous
December 18, 2020
Solved

How to better show file structure with FatFS and TouchGFX?

  • December 18, 2020
  • 2 replies
  • 5280 views

Hello!

I have code, working with FatFS in system area of my project.

main.c

res = f_opendir(&dir, "0:/");
while(1)
	{
 res = f_readdir(&dir, &fileInfo);
 if (res==FR_OK && fileInfo.fname[0])
 {
 fn = fileInfo.fname;
 // ... some code
	}
 else break;
 }
 f_closedir(&dir);

And I have scrollList widget, where I want to show filelist.

How can I send list of filenames to widget by Model->Presenter->View ?

  1. Create array filelist[65535][256] , and send it to view - is not good idea...
  2. Step by step sending command from View to System which everytime calls " res = f_readdir(&dir, &fileInfo); ", gets filename, and asks next filename again - is better, but still not good.
  3. Can I call res = f_opendir(&dir, "0:/"), and send variable "dir" to view?
  4. May be I can #include "fatfs.h" in STORAGE_SCREENView.cpp and work with FatFS from View?

What can you advise for me?

This topic has been closed for replies.
Best answer by MM..1

no you need use

typedef struct {
 FATFS* fs; /* Pointer to the owner file system object */
 WORD id; /* Owner file system mount ID */
 WORD index; /* Index of directory entry to start to search next */
 DWORD sclust; /* Table start cluster (0:Root dir) */
 DWORD clust; /* Current cluster */
 DWORD sect; /* Current sector */
 BYTE* dir; /* Pointer to the current SFN entry in the win[] */
 BYTE* fn; /* Pointer to the SFN (in/out) {file[8],ext[3],status[1]} */
#if _USE_LFN
 WCHAR* lfn; /* Pointer to the LFN working buffer */
 WORD lfn_idx; /* Index of last matched LFN entry (0xFFFF:No LFN) */
#endif
} DIR;

your code here

void STORAGE_SCREENView::setupScreen()
{
 if (f_mount(&fileSystem, "", 0) == FR_OK)
 {
 res = f_opendir(&dir, "0:/");
files_found=0;
 while(1)
 {
 res = f_readdir(&dir, &fileInfo);
 if (res==FR_OK && fileInfo.fname[0])
 {
 files_found++;
 }
 else break;
 }
 }
scrollList1.setNumberOfItems( files_found);
}
 
void STORAGE_SCREENView::scrollList1UpdateItem(FileList_Container& item, int16_t itemIndex)
{
files_found=0;
 while(1)
 {
 res = f_readdir(&dir, &fileInfo);
 if (res==FR_OK && fileInfo.fname[0])
 {
 if (files_found==itemIndex) break;
 }
 files_found++;
 }
item.SetItemFName(fileInfo.fname);
}

2 replies

Vangelis Fortounas
Vangelis Fortounas
Associate II
December 19, 2020
Error while parsing Rich Text Content
A
Anonymous
December 19, 2020

What?????

MM..1
MM..1
Chief III
December 19, 2020

You send nothing. In main or screensetup create array as you write and fill it with names.

Create next one global variable listvalid aka count.

In screen code extern this two memory and use it.

More complicated is when you plan browse more directories...

A
Anonymous
December 19, 2020

You don't understand me.

I need to output the contents of the folder in the custom container.Theoretically, the files in it can be 65536 and the name length is up to 256 bytes. Creating a variable (as you advised me in the next topic) is not rational because of the large amount of memory. Therefore, I want to do this - read the file name using FatFs, output it to the custom container, and when selecting a file, read the value of the text placed in the custom container.

At the moment, I put in view #include " paths.h" and read the folder structure at the start of the window. Immediately assign file names to the custom container elements. But is it rational?

MM..1
MM..1
Chief III
December 19, 2020

When you plan use 65536 files then you need too plan sdram memory and you dont have problem, But you have right, this isnt effective.

You dont explain your code. But simply screen have une special method to update list items then you dont need store anything.

In ::setupScreen() get count of files and call scrollList1.setNumberOfItems(xx)

for quick operation in setup too create dir handle and leave it opened, close in tear...

void ScreenxView::scrollList1UpdateItem(MenuItem& item, int16_t itemIndex)
{
 only semantic
use dir handle
set file on itemindex pos
get filename
set to item
}

when you choice list item system give you itemIndex, then you repeat and get name. This process have no memory overload...

Terms & ConditionsAccessibility statement