1.8 FAT Filesystem using RAM Media

This application shows an example of using the FAT File System to access RAM media.

Description

Application defines below array for reserving region in RAM for Fat File system based on the Start address and size configured in MHC.

#define KEEP __attribute__((keep, address(DRV_MEMORY_DEVICE_START_ADDRESS)))

/* Create an array for reserving region in RAM for Fat File system */ 
char CACHE_ALIGN RAM_FAT_MEDIA[DRV_MEMORY_DEVICE_MEDIA_SIZE_BYTES] KEEP;

File System Operations on the RAM:

  • Performs a SYS_FS_FormatDisk
  • Opens a newfile.txt on the RAM
  • Write and reads back 4KB of data on newfile.txt
  • Verifies the Data Read back

File system layer uses:

  • One instance of the Memory driver is used to communicate with the RAM PLIB

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/ram_fat/firmware.

To build the application, refer to the following table and open the project using its IDE.

Project NameDescription
pic32cz_ca70_curiosity_ultra.XMPLABX project for PIC32CZ CA70 Curiosity Ultra Development Kit

Setting Up the Hardware

The following table shows the target hardware for the application projects.

Project NameDescription
pic32cz_ca70_curiosity_ultra.XMPLABX project for PIC32CZ CA70 Curiosity Ultra Development Kit

Setting Up PIC32CZ CA70 Curiosity Ultra Development Kit

  • Connect the Debug USB port on the board to the computer using a micro USB cable

Running the Application

  1. Build and program the application using its IDE
  2. The LED is turned ON if data has successfully been written and read back from file “newfile.txt”
Refer to the following table for LED name:
BoardLED Name
PIC32CZ CA70 Curiosity Ultra Development KitLED1