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Chapter 8
L8-2(1)
Initialize CDC internal structures and variables.
L8-2(2)
Initialize CDC ACM internal structures and variables.
8
L8-2(3)
Create a new CDC ACM subclass instance. In this example, the line state
notification interval is 100 ms. In the CCI, an interrupt IN endpoint is used to
asynchronously notify the host of the status of the different signals forming the
serial line. The line state notification interval corresponds to the interrupt
endpoint’s polling interval.
L8-2(4)
Register the application callback, App_USBD_CDC_SerialLineCoding() . It is
called by the ACM subclass when the class-specific request SET_LINE_CODING
has been received by the device. This request allows the host to specify the
serial line settings (baud rate, stop bits, parity and data bits). Refer to “ CDC
PSTN Subclass, revision 1.2 ”, section 6.3.10 for more details about this class-
specific request.
L8-2(5)
Register the application callback, App_USBD_CDC_SerialLineCtrl() . It is
called by the ACM subclass when the class-specific request
SET_CONTROL_LINE_STATE has been received by the device. This request
generates RS-232/V.24 style control signals. Refer to “ CDC PSTN Subclass,
revision 1.2 ”, section 6.3.12 for more details about this class-specific request.
L8-2(6)
Check if the high-speed configuration is active and proceed to add the ACM
subclass instance to this configuration.
L8-2(7)
Check if the full-speed configuration is active and proceed to add the ACM
subclass instance to this configuration.
Listing 8-2 also illustrates an example of multiple configurations. The functions
USBD_ACM_SerialAdd() and USBD_ACM_SerialCfgAdd() allow you to create multiple
configurations and multiple instances architecture. Refer to section 7-1 “Class Instance
Concept” on page 99 for more details about multiple class instances.
126
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