AT91SAM9260 datasheet(91/798 Pages) ATMEL

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6221I–ATARM–17-Jul-09

AT91SAM9260

13.6.3.1

Enumeration Process

The USB protocol is a master/slave protocol. This is the host that starts the enumeration send-

ing requests to the device through the control endpoint. The device handles standard requests

as defined in the USB Specification.

The device also handles some class requests defined in the CDC class.

Unhandled requests are STALLed.

13.6.3.2

Communication Endpoints

There are two communication endpoints and endpoint 0 is used for the enumeration process.

Endpoint 1 is a 64-byte Bulk OUT endpoint and endpoint 2 is a 64-byte Bulk IN endpoint. SAM-

BA Monitor commands are sent by the host through the endpoint 1. If required, the message is

split by the host into several data payloads by the host driver.

If the command requires a response, the host can send IN transactions to pick up the response.

13.7

Hardware and Software Constraints

• SAM-BA Monitor disposes of two blocks of internal SRAM. The first block is available for user

code. Its size is 4K bytes The second block is used for variables and stacks.

Table 13-8.

Handled Standard Requests

Request

Definition

GET_DESCRIPTOR

Returns the current device configuration value.

SET_ADDRESS

Sets the device address for all future device access.

SET_CONFIGURATION

Sets the device configuration.

GET_CONFIGURATION

Returns the current device configuration value.

GET_STATUS

Returns status for the specified recipient.

SET_FEATURE

Used to set or enable a specific feature.

CLEAR_FEATURE

Used to clear or disable a specific feature.

Table 13-9.

Handled Class Requests

Request

Definition

SET_LINE_CODING

Configures DTE rate, stop bits, parity and number of

character bits.

GET_LINE_CODING

Requests current DTE rate, stop bits, parity and number of

character bits.

SET_CONTROL_LINE_STATE

RS-232 signal used to tell the DCE device the DTE device

is now present.

Table 13-10. User Area Address

Start Address

End Address

Size (bytes)

0x200000

0x201000

4096

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