Atmel AT85DVK-07 Especificaciones descargar pdf (Pagina 129)

129

AT85C51SND3Bx

7632A–MP3–03/06

Pipe Configuration The following flow must be respected in order to activate a Pipe:

Figure 66. Pipe activation flow:

Once the Pipe is activated (EPEN set) and, the hardware is ready to send requests to

the Device.

When configured (CFGOK = 1), only the Pipe Token (PTOKEN) and the polling interval

for Interrupt pipe can be modified.

A Control type pipe supports only 1 bank. Any other value will lead to a configuration

error (CFGOK = 0).

A clear of PEN will reset the configuration of the Pipe. All the corresponding Pipe regis-

ters are reset to there reset values. Please refers to the Memory Management chapter

for more details.

Note: The firmware has to configure the Default Control Pipe with the following parameters:

• Type: Control

• Token: SETUP

• Data bank: 1

• Size: 64 Bytes

The firmware asks for 8 bytes of the Device Descriptor sending a GET_DESCRIPTOR

request. These bytes contains the MaxPacketSize of the Device default control endpoint

and the firmware re-configures the size of the Default Control Pipe with this size

parameter.

Pipe

Activation

UPCONX

PENABLE=1

UPCFG0X

PTYPE

PTOKEN

PEPNUM

CFGOK=1

ERROR

Yes

UPCFG2X

INTFRQ

(interrupt only)

Pipe activated

and f reezed

UPCFG1X

PSIZE

PBK

CFGMEM

Enable the pipe

Select the Pipe type:

* Type (Control, Bulk, Interrup

* Token (IN, OUT , SETUP)

* Endpoint number

Configure the Pipe memory:

* Pipe size

* Number of banks

Configure the polling interval

for Interrupt pipe

1 2 ... 124 125 126 127 128 129 130 131 132 133 134 ... 262 263

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