Silicon Laboratories SiM3U1xx Instrukcja Użytkownika Pobierz pdf (Strona 2)

AN758

2 Rev. 0.1

2. Relevant Documentation

Precision32™ Application Notes are listed on the following website: www.silabs.com/32bit-appnotes.

AN667: Getting Started with the Silicon Labs Precision32™ IDE—provides a description of the IDE

features and environment.

AN670: Getting Started with the Silicon Labs Precision32™ AppBuilder —provides a description of the

AppBuilder features.

3. USB CDC Class

The USB communications device class (CDC) is a composite USB device class, and the class may include more

than one interface. The CDC is used primarily for modems, but also for ISDN, fax machines, and telephony

applications for performing regular voice calls.

The Abstract Control Model subclass of CDC and bridges the gap between legacy modem devices and USB

devices, enabling the use of application programs designed for older modems.

3.1. Class Requests

The class requests and class notifications supported are listed in Table 1.

These class-specific requests are used for device and call management.

3.1.1. Set Line Coding

This request allows the host to specify typical asynchronous line-character formatting properties.

Table 2 defines the line coding properties.

Table 1. Abstract Control Model Requests

Request Code Description

SET_LINE_CODING 20h Configures baud rate, stop-bits, parity, and number-

of-character bits.

GET_LINE_CODING 21h Requests current DTE rate, stop-bits, parity, and

number-of-character bits.

SET_CONTROL_LINE_STATE 22h RS232 signal used to tell the DCE device the DTE

device is now present.

bmRequestType bRequest wValue wIndex wLength Data

00100001b SET_LINE_CODING 0 interface size of

structure

line coding

structure

1 2 3 4 5 6 7 ... 29 30

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Silicon Laboratories SiM3U1xx Instrukcja Użytkownika Strona 2