參數(shù)資料
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
文件頁數(shù)： 60/118頁
文件大小： 356K
代理商： HIF_SPEC
3–36
Host Interface (HIF) Specification
60
Register Usage
Type
Regs
Contents
Description
Calling:
gr121
26 (0x19)
Service number
lr2
fileno
File descriptor number
Returns:
gr96
iostat
Input status
0x0001 = RDREADY
0x0002 = ISATTY
gr121
0x80000000
errcode
Logical TRUE, service successful
error number, service not successful
(implementation dependent)
Example Call
const
lr2
;set file
;descriptor = 0
const
gr121,26
;service = 26
asneq
69,gr1,gr1
;call the OS
jmpf
gr121,fail
;handle failure
sll
gr120,gr96,30
;test ISATTy status
;bit
jmpf
gr120,not_tty
;jump if not a tty
nop
In the example call, the program calls the
iostat
service to determine if the
device associated with file descriptor 0 is a
tty-like
device. If the service
returns an error indication in
gr121
, the program jumps to the
fail
label;
otherwise, the
iostat
value returned in
gr96
is shifted to put bit position 1 of the
result into the sign-bit of
gr120
, which is tested to determine if the file
descriptor refers to a
tty-like
device. If not, the program jumps to the
not_tty
label.
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