參數(shù)資料
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演示板的經營理論主機接口(誘導因子)規(guī)格
文件頁數(shù): 45/118頁
文件大?。?/td> 356K
代理商: HIF_SPEC
Host Interface (HIF) Specification
3–21
Example Call
fd:
.word
0
buf:
.block
256
const
gr96,fd
;set address of
consth
gr69,fd
;file descriptor
load
0,0,lr2,gr96
;get file
;descriptor
const
lr3,buf
;set buffer
consth
lr3,buf
;address
const
lr4,256
;specify buffer
;size
const
gr121,20
;service = 20
asneq
69,gr1,gr1
;call the OS
jmpf
gr121,wr_err
;handle write
;errors
const
gr120,num
;set address of
consth
gr120,num
;“num” variable
store
0,0,gr96,gr120
;store bytes
;written
The example call writes 256 bytes from the buffer located at
buf
to the file
associated with the descriptor stored in
fd
. If errors are detected during
execution of the service, the value returned in
gr121
will be FALSE. In this
case, the
wr_err
error handler will be invoked. The number of bytes actually
written is stored in the variable
num
.
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