1.3 FAT File System using NVM Media
This application shows an example of implementing a FAT disk in the device internal Flash memory.
Description
File System Operations on NVM:
- Application places a FAT disk image consisting of a Master Boot Record (MBR) sector, Logical Boot Sector, File allocation Table, and Root Directory Area in the internal Flash memory (NVM)
- During execution, the application first opens an existing file named
FILE.TXT and performs following file system related
operations:
- SYS_FS_FileStat
- SYS_FS_FileSize
- SYS_FS_FileSeek
- SYS_FS_FileEOF
- It tries to read the file and checks if string “Data” is present. If present it continues to next step or it fails the application
- Finally, the string “Hello World” is written to this file. The string is then read and compared with the string that was written to the file. If the string compare is successful, An LED indication is provided
File System Layer Uses:
- Memory driver to communicate with underlying NVM media
Downloading and Building the Application
To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repository or download as zip file. This content can also be downloaded using content manager by following these instructions.
Path of the application within the repository is apps/fs/nvm_fat/firmware.
To build the application, refer to the following table and open the project using its IDE.
| Project Name | Description |
|---|---|
| pic32mx470_curiosity.X | MPLABX project for Curiosity PIC32MX470 Development Board |
| pic32mx_eth_sk2.X | MPLABX project for PIC32 Ethernet Starter Kit |
| pic32mx_sk.X | MPLABX project for PIC32MX Starter Kit |
Setting Up the Hardware
The following table shows the target hardware for the application projects.
| Project Name | Description |
|---|---|
| pic32mx470_curiosity.X | Curiosity PIC32MX470 Development Board |
| pic32mx_eth_sk2.X | PIC32 Ethernet Starter Kit |
| pic32mx_sk.X | PIC32MX Starter Kit |
Setting Up Curiosity PIC32MX470 Development Board
- Connect mini USB cable to the ‘Debug USB’ connector(J3) on the board to the computer
Setting Up PIC32 Ethernet Starter Kit
- Connect the Debug USB port on the board to the computer using a mini USB cable
Setting Up PIC32MX Starter Kit
- Connect mini USB cable to the ‘Debug USB’ connector(J1) on the board to the computer
Running the Application
- Build and program the application using its IDE
- Press Switch to start the file operations
- The LED is turned ON when the File FILE.TXT has the app data “Hello World” written in it
Refer to the following table for Switch and LED names:
| Board | Switch Name | LED Name |
|---|---|---|
| Curiosity PIC32MX470 Development Board | S1 | LED1 |
| PIC32 Ethernet Starter Kit | SW1 | LED1 |
| PIC32MX Starter Kit | SW1 | LED3 |