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Description
The Abstract Control Model (ACM) is part of the USB Communications Device Class (CDC) standard which allows modem like devices to be supported by USB with a standardized protocol for data transfer and modem control.
A CDC ACM device is defined by information in the interface descriptors and is not specific to any product and vendor ID. There are numerous devices that support the CDC ACM protocol and some of the most important from Ultibo are the Arduino Mega 2560 R3 and the Arduino Due.
This driver presents any device recognized as a CDC ACM as a generic serial interface device that can be accessed using the API in the Serial unit. It should not be necessary to directly call any of the functions in this unit from application code.
Constants
To be documented
Type definitions
To be documented
Public variables
To be documented
Function declarations
Initialization functions
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procedure CDCACMInit;
Description: To be documented
CDC ACM serial functions
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function CDCACMSerialDeviceOpen(Serial:PSerialDevice; BaudRate,DataBits,StopBits,Parity,FlowControl,ReceiveDepth,TransmitDepth:LongWord):LongWord;
Description: To be documented
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function CDCACMSerialDeviceClose(Serial:PSerialDevice):LongWord;
Description: To be documented
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function CDCACMSerialDeviceRead(Serial:PSerialDevice; Buffer:Pointer; Size,Flags:LongWord; var Count:LongWord):LongWord;
Description: To be documented
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function CDCACMSerialDeviceWrite(Serial:PSerialDevice; Buffer:Pointer; Size,Flags:LongWord; var Count:LongWord):LongWord;
Description: To be documented
CDC ACM USB functions
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function CDCACMDriverBind(Device:PUSBDevice; Interrface:PUSBInterface):LongWord;
Description: Bind the CDC ACM driver to a USB device if it is suitable
| Device
|
The USB device to attempt to bind to
|
| Interrface
|
The USB interface to attempt to bind to (or nil for whole device)
|
| Return
|
USB_STATUS_SUCCESS if completed, USB_STATUS_DEVICE_UNSUPPORTED if unsupported or another error code on failure
|
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function CDCACMDriverUnbind(Device:PUSBDevice; Interrface:PUSBInterface):LongWord;
Description: Unbind the CDC ACM driver from a USB device
| Device
|
The USB device to unbind from
|
| Interrface
|
The USB interface to unbind from (or nil for whole device)
|
| Return
|
USB_STATUS_SUCCESS if completed or another error code on failure
|
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procedure CDCACMReceiveWorker(Request:PUSBRequest);
Description: Called (by a Worker thread) to process a completed USB request from the CDC ACM bulk IN endpoint
| Request
|
The USB request which has completed
|
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procedure CDCACMReceiveComplete(Request:PUSBRequest);
Description: Called when a USB request from the CDC ACM bulk IN endpoint completes
| Request
|
The USB request which has completed
|
| Note
|
Request is passed to worker thread for processing to prevent blocking the USB completion
|
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procedure CDCACMTransmitStart(Request:PUSBRequest);
Description: Called to continue transmission of data from the transmit buffer
| Request
|
The USB transmit request to use
|
| Note
|
Caller must hold the lock on the serial device
|
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procedure CDCACMTransmitWorker(Request:PUSBRequest);
Description: Called (by a Worker thread) to process a completed USB request to the CDC ACM bulk OUT endpoint
| Request
|
The USB request which has completed
|
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procedure CDCACMTransmitComplete(Request:PUSBRequest);
Description: Called when a USB request to the CDC ACM bulk OUT endpoint completes
| Request
|
The USB request which has completed
|
| Note
|
Request is passed to worker thread for processing to prevent blocking the USB completion
|
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procedure CDCACMInterruptWorker(Request:PUSBRequest);
Description: Called (by a Worker thread) to process a completed USB request to the CDC ACM interrupt IN endpoint
| Request
|
The USB request which has completed
|
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procedure CDCACMInterruptComplete(Request:PUSBRequest);
Description: Called when a USB request from the CDC ACM interrupt IN endpoint completes
| Request
|
The USB request which has completed
|
| Note
|
Request is passed to worker thread for processing to prevent blocking the USB completion
|
CDC ACM helper functions
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function CDCACMCheckDevice(Device:PUSBDevice; var Quirks:LongWord):LongWord;
Description: Check the Vendor and Device ID against the supported devices
| Device
|
USB device to check
|
| Quirks
|
Return value for any device specific quirks (eg CDCACM_QUIRK_NO_UNION_NORMAL)
|
| Return
|
USB_STATUS_SUCCESS if completed or another error code on failure
|
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function CDCACMCheckInterface(Device:PUSBDevice; Interrface:PUSBInterface):LongWord;
Description: Check the Interface against the supported devices
| Device
|
USB device to check
|
| Interrface
|
USB interface to check
|
| Return
|
USB_STATUS_SUCCESS if completed or another error code on failure
|
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function CDCACMCheckDeviceAndInterface(Device:PUSBDevice; Interrface:PUSBInterface):LongWord;
Description: Check the Device and Interface against the supported devices
| Device
|
USB device to check
|
| Interrface
|
USB interface to check
|
| Return
|
USB_STATUS_SUCCESS if completed or another error code on failure
|
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function CDCACMFindInterfaces(Device:PUSBDevice; Interrface:PUSBInterface; var DataInterface,ControlInterface:PUSBInterface; Quirks:LongWord; var Capabilities:Byte):LongWord;
Description: Locate the data and control interfaces from the functional descriptors
| Device
|
USB device to check
|
| Interrface
|
USB interface to check (Optional)
|
| DataInterface
|
Return value for the located data interface
|
| ControlInterface
|
Return value for the located control interface
|
| Quirks
|
Any known quirks for this device from identification (eg CDCACM_QUIRK_NO_UNION_NORMAL)
|
| Capabilities
|
Return value for ACM capabilities (eg USB_CDC_ACM_CAP_LINE)
|
| Return
|
USB_STATUS_SUCCESS if completed or another error code on failure
|
[Expand]
function CDCACMControlRequest(Serial:PCDCACMDevice; Request:Byte; Value:Word; Data:Pointer;Size:Word):LongWord;
Description: To be documented
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function CDCACMGetLineRequest(Serial:PCDCACMDevice; var LineCoding:TUSBCDCLineCoding):LongWord;
Description: To be documented
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function CDCACMSetLineRequest(Serial:PCDCACMDevice; const LineCoding:TUSBCDCLineCoding):LongWord;
Description: To be documented
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function CDCACMSetControlRequest(Serial:PCDCACMDevice; Control:Word):LongWord;
Description: To be documented
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