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ACM Subclass
8-4-4 SUBCLASS NOTIFICATION AND MANAGEMENT
You have access to some functions provides in the ACM subclass which relate to the ACM
requests and the serial line state previously presented in section 8-4-1 “Overview” on
8
page 121. Table 8-7 shows these functions. Refer to section C-2 “CDC ACM Subclass
Functions” on page 369 for more details about the functions’ parameters.
Function
USBD_ACM_SerialLineCodingGet()
USBD_ACM_SerialLineCodingSet()
USBD_ACM_SerialLineCodingReg()
USBD_ACM_SerialLineCtrlGet()
USBD_ACM_SerialLineCtrlReg()
USBD_ACM_SerialLineStateSet()
USBD_ACM_SerialLineStateClr()
Relates to...
SetLineCoding
GetLineCoding
SetLineCoding
SetControlLineState
SetControlLineState
Serial line state
Serial line state
Description
Application can get the current line coding
settings set either by the host with
SetLineCoding requests or by
USBD_ACM_SerialLineCodingSet()
Application can set the line coding. The host can
retrieve the settings with the GetLineCoding
request.
Application registers a callback called by the
ACM subclass upon reception of the
SetLineCoding request. Application can
perform any specific operations.
Application can get the current control line state
set by the host with the SetControlLineState
request.
Application registers a callback called by the
ACM subclass upon reception of the
SetControlLineState request. Application can
perform any specific operations.
Application can set any line state event(s). While
setting the line state, an interrupt IN transfer is
sent to the host to inform about it a change in
the serial line state.
Application can clear two events of the line
state: transmission carrier and receiver carrier
detection. All the other events are self-cleared
by the ACM serial emulation subclass.
Table 8-7 ACM Subclass Functions Related to the Subclass Requests and Notifications
Micriμm’s ACM subclass always uses the interrupt endpoint to notify the host of the serial
line state. You cannot disable the interrupt endpoint.
127
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