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| 型號(hào)： | 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(yíng)理論主機(jī)接口（誘導(dǎo)因子）規(guī)格 |
| 文件頁(yè)數(shù)： | 54/118頁(yè) |
| 文件大小： | 356K |
| 代理商： | HIF_SPEC |
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3–30
Host Interface (HIF) Specification
54
RAW mode delivers the characters to/from the I/O device without conversion
or interpretation of any kind.
If COOKED mode has been selected, line-buffering is implied. If NBLOCK is
also selected, a subsequent
read
operation will return –1 for the
count
, unless
an entire line of input is available.
The ECHO mode applies only to the standard input device (file descriptor = 0),
and makes provision to automatically echo data received from that device to
the standard output device (file descriptor = 1). ECHO mode is undefined for
any other file descriptor.
The CBREAK mode is intended for file descriptors that refer to serial
communication channels. CBREAK mode specifies that I/O signal inputs will
be processed, which could alter the data stream.
The NBLOCK and ASYNC settings are not necessarily mutually exclusive.
There may be occasions where this is a legal mode. NBLOCK specifies that
subsequent
read
,
write
, or
lseek
operations not block until completion. If a
read
is requested, for example, and no data is currently available, the
read
service will return –1 (with an
errcode
value in
gr121
of EAGAIN), rather than
blocking further execution until data becomes available. ASYNC mode simply
allows an operation, once invoked, to proceed asynchronously with other
operations, if the HIF implementation provides this capability.
If the above
mode
settings are not implemented, the EHIFNOTAVAIL error
code should be returned to the user if the
ioctl
service is invoked.
Although the
mode
parameter occupies a 32-bit word, only the low-order
16-bits are reserved. The upper 16-bits are available for
implementation-dependent mode settings, and are not part of this specification.
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