UM0290 datasheet(44/76 Pages) STMICROELECTRONICS

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Mass storage demo

UM0290

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Figure 11.

Hardware and firmware interaction diagram

The hardware configuration layer is represented by the two files HW_config.c and

HW_config.h. For the Mass Storage demo, the hardware management layer manages the

following hardware requirements:

●

System and USB IP clock configuration

●

Read and write LEDs configuration

●

LEDs command

●

Get the characteristics of the memory medium (the block size and the memory

capacity)

5.3.2

Endpoint configurations and data management

This section provides a description of the configuration and the data flow according to the

transfer mode.

Endpoint configurations

The endpoint configurations should be done after each USB reset event, so this part of code

is implemented in the function MASS_Reset (file usp_prop.c).

The default endpoint (pipe 0) configuration is the same for the two transfer modes.

To configure the endpoint 0 it is necessary to:

●

Configure the Endpoint 0 as default control endpoint

●

Configure the Endpoint 0 Rx and Tx count and buffer addresses (in the BTABLE)

●

Configure the Endpoint Rx status to VALID and the Tx status to NAK.

Hardware Config interface

Hardware (STR + evaluation board)

USB IP

USB Library

USB Application

Standard

Library

UM0290 Datasheet(PDF) 44 Page - STMicroelectronics