PsiFS: SWI Calls

PsiFS_Set

PsiFS_Set
(SWI &520C2)

Modify a PsiFS option

On entry: R0 = option to modify

If the option specified by R0 requires a numeric value

R1 = value to set

If the option specified by R0 requires a string value

R1 = pointer to control-character terminated string

On exit: Registers preserved

Interrupts: Interrupt status is undefined
Fast interrupts are enabled

Processor mode: Processor is in SVC mode

Re-entrancy: SWI is not re-entrant

Use:

This call sets the value of a PsiFS option. An error may be returned if an attempt is made to modify an option that is meaningless for the current mode of operation.

The options that may be set are:

R0 Type Option

&100 string name of the serial block driver

&101 numeric serial block driver port number

&102 numeric serial block driver baud rate

&103 string optional extra serial block driver options

&104 numeric automatic baud rate identification mode

&110 numeric clock synchronization mode

Related SWIs: PsiFS_Get, PsiFS_Mode

Related vectors: None

`PsiFS_Set &100` `(SWI &520C2)`
	Set the serial block driver name

On entry:	R0 =	&100
	R1 =	pointer to control-character terminated serial block driver name string

On exit:	Registers preserved

Use:	This call sets the name of the configured serial block driver.

`PsiFS_Set &101` `(SWI &520C2)`
	Set the serial block driver port number

On entry:	R0 =	&101

On exit:	R1 =	port number (0 for the first)

On exit:	Registers preserved

Use:	This call sets the configured serial block driver port number.

`PsiFS_Set &102` `(SWI &520C2)`
	Set the serial block driver baud rate

On entry:	R0 =	&102

On exit:	R1 =	baud rate

On exit:	Registers preserved

Use:	This call sets the configured serial block driver baud rate. If the requested baud rate is not available then a valid alternative is selected.

`PsiFS_Set &103` `(SWI &520C2)`
	Set the serial block driver options

On entry:	R0 =	&103
	R1 =	pointer to control-character terminated serial block driver options string

On exit:	Registers preserved

Use:	This call sets the optional parameter string of the configured serial block driver.

`PsiFS_Set &104` `(SWI &520C2)`
	Set the automatic baud rate identification mode

On entry:	R0 =	&104
	R1 =	automatic baud rate identification (0 disables)

On exit:	Registers preserved

Use:	This call enables or disables automatic baud rate identification. Only the remote link is affected; the printer mirror always uses the configured baud rate.

`PsiFS_Set &110` `(SWI &520C2)`
	Set the clock synchronization mode

On entry:	R0 =	&110
	R1 =	clock synchronization mode (0 disables)

On exit:	Registers preserved

Use:	This call enables or disables synchronization of clocks on connection of the remote link. This only affects EPOC devices; it is not possible to synchronize the clock of SIBO devices.

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