topic Re: attempting SD card on K60 without RTOS in Kinetis Microcontrollers

attempting SD card on K60 without RTOS

arunkumar1989 — Thu, 19 Mar 2015 04:38:04 GMT

Hello Everyone,

I am attempting to get an SD card working without using an RTOS.

I am stuck at a few points and need some help.

I have attached the project with this thread.

Firstly when opening file using FAT1_open(),it returns FR_OK,but i do not see the file created on my computer.

Secondly,

FAT1_close() always gives error 0x01, FR_DISK_ERR for no reason, am i missing something else here?

Thanks in advance,

Arun Kumar

Re: attempting SD card on K60 without RTOS

BlackNight — Thu, 19 Mar 2015 07:15:47 GMT

Hi Arun,

there is no project attached?

Erich

Re: Re: attempting SD card on K60 without RTOS

arunkumar1989 — Thu, 19 Mar 2015 07:34:29 GMT

Opps here it is

Re: Re: attempting SD card on K60 without RTOS

BlackNight — Thu, 19 Mar 2015 09:13:21 GMT

Hi Arun,

thanks for posting the project. I assume you are using CodeWarrior v10.6 with my latest components from SourceForge?

I see that you had a .metadata (workspace) folder inside your project: that's clearly something not good (don't put a workspace into your project folder).

When compiling, I noticed this warning:

Description Resource Path Location Type

ignoring #pragma jump_switch [-Wunknown-pragmas] display.c /sdcard1/Sources line 261 C/C++ Problem

but this one is a real problem:

Description Resource Path Location Type

passing argument 1 of 'f_mount' from incompatible pointer type [enabled by default] passing argument 2 of 'f_mount' makes pointer from integer without a cast [enabled by default] sdcard.c /sdcard1/Sources line 19 C/C++ Problem

You pass a pointer to a file (FILE fp), and not a pointer to a FATFS fs. For sure, this will be a big problem the memory blocks/size behind these are different.

So can you fix this?

The other problem with your project I see is this: you are using the Timeout component, but I don't see that you feed the timeout every 10 ms (as specified in the properties) from a 10 ms timer interrupt or similar: you need to call TMOUT1_AddTick() every 10 ms, e.g. from Events.c.

Please have a look at this FatFS bare-metal (no OS) project on GitHub:

mcuoneclipse/Examples/TRW-K60N512/TWR-K60N512_FatFS_BM at master · GitHub

I hope this helps,

Erich

Re: attempting SD card on K60 without RTOS

arunkumar1989 — Thu, 19 Mar 2015 09:51:22 GMT

Yes sir, i am using CW 10.6

I changed FILE fp to FAFTS fp;

I checked out the bare metal project,it gives me error on these lines

[code]

while(!FAT1_isDiskPresent()) {

[/code]

Description Resource Path Location Type

too few arguments to function 'FAT1_isDiskPresent' Application.c /TWR-K60N512_FatFS_BM/Sources line 79 C/C++ Problem

[code]

FAT1_mount(0, &fileSystemObject); /* mount file system */

[/code]

Description Resource Path Location Type

macro "FAT1_mount" requires 3 arguments, but only 2 given 'FAT1_mount' undeclared (first use in this function) Application.c /TWR-K60N512_FatFS_BM/Sources line 83 C/C++ Problem

Re: attempting SD card on K60 without RTOS

BlackNight — Thu, 19 Mar 2015 10:07:50 GMT

Yes, I'm sorry, I missed to make the changes needed for CW for MCU10.6. I have now commited the changes:

https://github.com/ErichStyger/mcuoneclipse/commit/1ece772a76c38a46c4fcaa3f8a49b8fcbaf4343f

Erich

Re: attempting SD card on K60 without RTOS

arunkumar1989 — Fri, 20 Mar 2015 09:58:38 GMT

Hello sir,

I am able to create a file in the SD card now, Thank you so much.

The timer interrupt did the trick .

Arun

Re: attempting SD card on K60 without RTOS

arunkumar1989 — Tue, 24 Mar 2015 05:18:58 GMT

Hello Erich,

I am stuck with this problem and was wondering if you could help me out,

Is it possible to store a file in a particular address of my choosing in an sd card,that way i do not need to know the the file name for any operation like file deletion or file renaming?

Also in the "FAT1_getfree(path, nclst, fs)" function does nclst gives the size in Bytes?

Thanks in advance,

Arun

Re: attempting SD card on K60 without RTOS

BlackNight — Tue, 24 Mar 2015 11:21:54 GMT

Hi Arun,

the file system manages the low level blocks and allocation, so you cannot put a file at a specifiic address if using the file system. You would need to use the SD card in raw/block mode instead (but then you are not using the file system).

Using the file system, you do not need to know the file name for the delete operation: you need the file handle. But of course you need the file name/path to open the file to get the handle.

As for getfree() (and others), I recomment to have a look at the FatFs web site, or here FatFs - f_getfree

Erich