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| 型號： | HIF_SPEC |
| 英文描述： | EZ-030 Demonstration Board Theory of Operation Host Interface (HIF) Specification |
| 中文描述： | 易- 030演示板的經(jīng)營理論主機(jī)接口（誘導(dǎo)因子）規(guī)格 |
| 文件頁數(shù)： | 53/118頁 |
| 文件大?。?/td> | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
3–29
53
Multiple mode values are possible; however, COOKED, RAW, and CBREAK
modes are mutually exclusive. Other mode values can be combined with these
by logically ORing them to form a composite mode value. Certain mode
values do not apply to every open file descriptor. For example, the ASYNC
mode is used to establish a data input mode that will cause a
read
,
write
, or
lseek
operation, once initiated, to complete at a later time. With the ASYNC
mode set, a
read
or
write
request will immediately return after passing the
buffer address and file descriptor to the operating system, leaving the
scheduling of the operation up to the HIF implementation.
lseek
operations can
also be serviced in ASYNC mode. The completion status of these operations
can be tested by issuing an
iowait
service request (HIF service number 25).
When a
read
or
write
operation is issued for a file descriptor whose operating
mode is ASYNC, the
count
returned in
gr96
will be 0 if the operation was
accepted, or less than 0 if the operation was rejected. An
iowait
service should
be issued to ascertain the number of bytes that have been transferred upon
completion of the operation.
The default I/O processing mode is COOKED (0x0000), which implies that the
HIF implementation examines input and output data characters as they are
received, or before they are sent, and may perform some alteration of the data.
Specific alterations are not explicitly indicated in this specification; however, it
is common to perform end-of-line processing for files whose operating mode is
COOKED. ASCII carriage-return and line-feed translations are common, as
may be the translation of ASCII TAB characters to a number of equivalent
spaces. When RAW mode is selected, no translation of input or output
characters will be performed by HIF-conforming implementations.
Normally, when a
read
operation is issued for a terminal-like device by the
application program, the processor will block any further execution of the
subject program until the data has been transferred. The NBLOCK mode is
intended to specify for terminal-like devices that subsequent
read
operations
be executed without suspending (blocking) further CPU operation. This is
particularly relevant to
read
operations when RAW mode is also selected. If
NBLOCK mode has been specified, a subsequent
read
operation will return (in
gr96
) the number of characters currently available, or –1 if none are available.
NBLOCK mode is not meaningful for
write
operations, but they are handled in
the same fashion as synchronous or asynchronous operations, depending on
whether ASYNC mode was specified.
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