DeviceDriver_Entry 7 (changes)
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DeviceFS
» DeviceDriver_Entry
» DeviceDriver_Entry 7
DeviceDriver_Entry 7
(SWI -)
| Entry | |
|---|---|
| R0 | 7 (Create buffer for RX) |
| R2 | Device driver stream handle |
| R3 | Suggested buffer flags |
| R4 | Suggested buffer size (non-zero) |
| R5 | Suggested buffer handle, or -1 to generate unique handle |
| R6 | Suggested buffer threshold (when halt event is called) |
| Exit | |
|---|---|
| R3 – R6 | Modified as the device driver requires |
Use
This entry point is called just before the buffer is created, to allow the driver to modify parameters as desired.
Notes
The suggested buffer flags are those given when the device was registered. R5 will default to -1 (generate unique handle) but you may specify the number of a buffer to link to.
See also
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