DeviceFS_TransmitCharacter (changes)
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DeviceFS
» SWI Calls
» DeviceFS_TransmitCharacter
DeviceFS_TransmitCharacter
(SWI &42747)
| Entry | |
|---|---|
| R1 | DeviceFS stream handle |
| Exit | |
|---|---|
| R0 | Byte to transmit |
| - | C set => unable to read a character to transmit |
Use
The purpose of this call is to inform DeviceFS that a device driver wants to transmit a character.
Notes
This SWI is made by a device when it wants to transmit a character. DeviceFS will try to find character (unbuffer one, or read from a waiting stream).
For speed DeviceFS_TransmitCharacter and DeviceFS_ReceivedCharacter do not validate the external handle passed – strange things will happen if bad handles are passed.
See also
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