ASF USB host mass storage

Human interface on EVK1101 :

Introduction

This example shows how to implement a USB host mass storage on Atmel MCU with USB module.

Startup

After loading firmware, connect the board (EVKxx,Xplain,...) to a U-Disk (FAT/FAT32 are supported). This example creates a file "uhi_msc_test.txt" on all present U-disks.

• PWR led is on when power present
• Led 0 is on when USB OTG cable is plugged and Vbus is present
• Led 1 is continuously on when a device is connected
• Led 1 blinks when the device is enumerated and USB in idle mode
  • The blink is slow (1s) with low speed device
  • The blink is normal (0.5s) with full speed device
  • The blink is fast (0.25s) with high speed device
• Led 2 is on when a read or write access is on going
• Led 3 is on when a LUN test is success
• Led 3 blinks when a LUN test is unsuccessful

About example

The example uses the following module groups:

• Basic modules: Startup, board, clock, interrupt, power management
• USB host stack and MSC modules:
  services/usb/
  services/usb/uhc/
  services/usb/class/msc/host/
• 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 (buttons, leds)