ASF USB Device MSC

Human interface on SAM L21 Xplained Pro.

Introduction

This example shows how to implement a USB Device Mass Storage on Atmel MCU with USB module.

Startup

The example uses all memories available on the board and connects these to USB Device Mass Storage stack. After loading firmware, connect the board (EVKxx,Xplain,...) to the USB Host. When connected to a USB host system this application allows to display all available memories as a removable disks in the Unix/Mac/Windows operating systems.

Note

This example uses the native MSC driver on Unix/Mac/Windows OS, except for Win98.

• LED0 blinks when USB host has checked and enabled MSC interface

About example

The example uses the following module groups:

• Basic modules: Startup, board, clock, interrupt, power management
• USB Device stack and MSC modules:
  services/usb/
  services/usb/udc/
  services/usb/class/msc/
• Specific implementation:
  • main.c,
    initializes clock
    initializes interrupt
    manages UI
  • specific implementation for each target "./examples/product_board/":
    • conf_foo.h configuration of each module
    • ui.c implement of user's interface (leds)

¹ The memory data transfers are done outside USB interrupt routine. This is done in the MSC process ("udi_msc_process_trans()") called by main loop.