CCS/TM4C123GH6PM: SPI flash file system support

Chandrashekhar V9

Part Number: TM4C123GH6PM

Tool/software: Code Composer Studio

Hi,

We are using TM4C123GH6PM microcontroller with M25P32-VMW6TG spi flash. Using below link as reference code. We ported bare metal driver we are able to read/write spi flash.

But we have problem in filesystem support with windows. Windows detected the storage but unable to format to FAT32 or FAT16. Can please help how do we solve this issue.

https://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/t/501515

At same time we tested the USB bulk transfer to SPI flash to read the content. It works with out a problem.

Rgds

Chandra

over 8 years ago

0 Bob Crosby over 8 years ago

TI__Guru 72500 points

Take a look at the TivaWare example: C:\ti\TivaWare_C_Series-2.1.4.178\examples\boards\dk-tm4c123g\usb_dev_msc. This example was written for the DK-TM4C123G, but if you ignore the part for the on-board LCD display, you should be able to see how the USB mass storage device is configured.

0 Chandrashekhar V9 over 8 years ago in reply to Bob Crosby

Intellectual 400 points

Thanks Bob,

USB mass storage we tested it works fine if we connect the SDCARD over SPI. My question here is M25P32-VMW6TG flash which is 4MB(32Mbit) possibility with FAT32 or FAT16 file system support.

Also withh M25P32-VMW6TG flash we are able to mount issue we are facing is FAT32/FAT16 formatting. Unable to format the flash.

Note: Sector read and erase works with existing SPI code.

Rgds
Chandra

0 Bob Crosby over 8 years ago in reply to Chandrashekhar V9

TI__Guru 72500 points

The example I pointed to uses FATFS, which is also downloaded with TivaWare. (C:\ti\TivaWare_C_Series-2.1.4.178\third_party\fatfs\doc) If I understand correctly, your issue is not the hardware, rather you have not the firmware to support creating the File Allocation Table. This is where FATFS should help you.

0 Chandrashekhar V9 over 8 years ago in reply to Bob Crosby

Intellectual 400 points

Hi Bob,

You are correct issue with limitation with software . If we connect 1GB sdcard in place of SPI flash . File system mounting works . We donot have any problem. Question is for SPI flash which we are using.

Rgds

Chandra

0 Bob Crosby over 8 years ago in reply to Chandrashekhar V9

TI__Guru 72500 points

This is outside of my area of expertise as it is really not directly related to the TM4C device, but doing a Google search I see that 4MB is too small for FAT32 and may be too small for FAT16
superuser.com/.../minimum-volume-size-for-fat16

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CCS/TM4C123GH6PM: SPI flash file system support