Renesas CPU Board M3A-HS19 Manual de usuario descargar pdf (Pagina 7)

SH7285/SH7286 USB Function Module

USB to Serial Conversion Application Note

REJ05B1152-0100/Rev.1.00 May 2008 Page 7 of 35

The USB function module decodes the request, and automatically processes the Data stage and Status stage according

to the USB standard request. However, some USB standard requests, class requests, and vendor requests should be

executed by the software.

The sample program executes the Get Descriptor command, which is the USB standard request to be processed by the

software. To convert USB communication into serial communication, the sample program executes USB

communication class requests.

Table 2.3 lists USB Commands and Processing in the Sample Program.

When the sample program receives a USB command that it does not support, it returns a STALL handshake.

Table 2.3 USB Commands and Processing in the Sample Program

USB Command Type Processing in the Sample Program

Clear Feature

Get Configuration

Get Interface

Get Status

Set Address

Set Configuration

Set Feature

Set Interface

The hardware decodes the command, and executes the Data

stage and the Status stage automatically. The software

does

nothing.

Get Descriptor

USB

standard

request

Set Line Coding

Set Control Line State

Send Break

Get Line Coding

USB

communication

class

request

The software decodes the command, and executes the Data

stage and the Status stage.

Other USB commands - The software returns a STALL handshake.

1 2 3 4 5 6 7 8 9 10 11 12 ... 34 35

Sin comentarios

Renesas CPU Board M3A-HS19 Manual de usuario Pagina 7