vxworks programmer's guide.pdf - DAQ Plone Site

D
Intel x86
! CAUTION: This structure applies to both ATA PCMCIA PC cards and local IDE
hard disks. For the definition of PCCARD_RESOURCE, see PCMCIA for x86 Release
Notes and Supplement.
Line Printer Driver
This release of VxWorks for the x86 supports write operations to an LPT line
printer driver.
To include the line printer driver in your configuration, select the macro
INCLUDE_LPT for inclusion in the project facility VxWorks view. When
INCLUDE_LPT is included, the initialization routine lptDrv( ) is called
automatically from usrRoot( ) in usrConfig.c.
The resource table used by lptDrv( ) is stored in the structure lptResource[] in
sysLib.c. The resources are defined as follows:
int ioBase; /* IO base address */
int intVector; /* interrupt vector */
int intLevel; /* interrupt level */
BOOL autofeed; /* TRUE if enable autofeed */
int busyWait; /* loop count for BUSY wait */
int strobeWait; /* loop count for STROBE wait */
int retryCnt; /* timeout second for syncSem */
D
lptDrv( )takes two arguments. The first argument is the number of channels (0, 1,
or 2). The second argument is a pointer to the resource table.
To change lptDrv( )’s interrupt vector or interrupt level, change the value of the
appropriate constant (LPT_INT_VEC or LPT_INT_LVL) in pc.h.
Many of the LPT driver’s routines are accessible only through the I/O system.
However, the following routines are available (see the manual pages for details):
lptDevCreate( )
installs an LPT device into VxWorks. Call lptDevCreate( ) explicitly for each
LPT device you wish to install; it is not called automatically. This routine takes
the following parameters:
name = device name
channel = physical device channel (0, 1, or 2)
lptAutofeed( )
enables or disables the autofeed feature; takes the parameter channel (0, 1, or 2).
475