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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)營理論主機接口（誘導因子）規(guī)格 |
| 文件頁數(shù)： | 43/118頁 |
| 文件大小： | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
3–19
Service 20 – write
Write a Buffer of Data to a File
Description
This service writes a number of bytes from memory (starting at the address
given by the pointer in
lr3
) into the file specified by the small positive integer
file descriptor that was returned by the
open
service when the file was opened
for writing.
lr4
contains the number of bytes to be written. The number of
bytes actually written is returned in
gr96
. If an error is detected,
gr121
will
contain a small positive integer on return from the service, indicating the
nature of the error.
Register Usage
Type
Regs
Contents
Description
Calling:
gr121
20 (0x14)
Service number
lr2
fileno
File descriptor
lr3
buffptr
A pointer to buffer area
lr4
nbytes
Number of bytes to be written
Returns:
gr96
count*
*See
Return Value
table, below.
gr121
0x80000000
errcode
Logical TRUE, service successful
Error number, service not successful
(implementation dependent)
The value returned in register
gr96
can be interpreted differently, depending on
the current operating mode of the file identified by the
fileno
parameter. The
operating mode is established or changed by invoking the
ioctl
service (24).
The following table shows how the return value in
gr96
should be interpreted
for various operating modes.
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