The bd STREAMS module processes the byte streams generated by the SunButtons buttonbox and SunDials dialbox. The buttonbox generates a stream of bytes that encode the identity and state transition of the buttons. The dialbox generates a stream of bytes that encode the identity of the dials and the amount by which they are turned. Both of these streams are merged together when a host has both a buttonbox and a dialbox in use at the same time.
SunButtons reports the button number and up/down status encoded into a one byte message. Byte values from 0xc0 to 0xdf indicate a transition to button down. To obtain the button number, subtract 0xc0 from the byte value. Byte values from 0xe0 to 0xff indicate a transition to button up. To obtain the button number, subtract 0xe0 from the byte value.
Each dial sample in the byte stream consists of three bytes. The first byte identifies which dial was turned and the next two bytes return the delta in signed binary format. When bound to an application using the window system, Virtual User Input Device ("VUID") events are generated. An event from a dial is constrained to lie between 0x80 and 0x87.
A stream with the bd pushed streams module configured in it can emit firm_events as specified by the protocol of a VUID. bd understands the VUIDSFORMAT and VUIDGFORMAT ioctls (see reference below), as defined in /usr/include/sys/bdio.h and $OPENWINHOME/include/xview/win_event.h. All other ioctl() requests are passed downstream.
The bd streams module sets the parameters of the serial port when it is first opened. No termio(7I) ioctl () requests should be performed on a bd STREAMS module, as bd expects the device parameters to remain as it set them.
VUIDGFORMAT These are standard VUID ioctls.
The bd streams module
implements this ioctl to enable processes to manipulate the lights on the
buttonbox. The BDIOBUTLITE ioctl must be carried by an
I_STR ioctl to the bd module. For an explanation of I_STR see streamio(7I). The data for the BDIOBUTLITE ioctl is an unsigned integer in which each bit represents the lamp on one button. The macro LED_MAP in <sys/bdio.h> maps button numbers to appropriate bits. Source code for the demo program x_buttontest is provided with the buttons and dials package, and may be found in the directory /usr/demo/BUTTONBOX. Look at x_buttontest.c for an example of how to manipulate the lights on the buttonbox.
bdconfig(1M), ioctl(2), x_buttontest(6), x_dialtest(6), streamio(7I), termio(7I)
SunButtons Installation and Programmers Guide
SunDials Installation and Programmers Guide
The SunDials dial box must be used with a serial port.