Весь материал к лабораторной работе №6 по ВС и МПТ (IOTRAN)

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IOTRAN Utility Program V1.0
------ ------- ------- ----

	IOTRAN is supplied with the AVSIM family of simulator\debuggers
to facilitate the use of I/O files. I/O files that interface to AVSIM
must be in a binary format - either byte or word-wide. This is convenient
for I/O that is ASCII, but less so for handling numerical values from/to
other programs, such as BASIC, FORTRAN, etc.

	Let's suppose that you have an A/D converter attached to your CPU via
a parallel port. You are sampling a sine wave and computing its RMS power.
A D/A converter is also attached, to output the analog RMS power.

	To generate the input file of sine wave samples, use a BASIC routine:

	10 OPEN #1,"SINE.AD"
	20 FOR S=0 TO 100
	30   PRINT #1,32767*SIN(6.28*S/10)
	40 NEXT
	50 CLOSE #1

	Now you have a file that contains a list of integers in floating point
format. This cannot be fed to AVSIM directly, as it will appear as a string
of ASCII values instead of the decimal value itself. ie. "123" will be read
by AVSIM's I/O facility as 31H,32H,33H instead of 7BH (123 decimal).

	IOTRAN will do the conversion by:

	>IOTRAN db SINE

	This does a decimal-to-byte translation from file SINE.AD to SINE.AB.
	Decimal values outside the range -128 to 127 are converted to their
	remainder in modulus 128. Fractions are rounded. 
	
	Now suppose the A/D converter is 16-bits, and is configured so that the
first read provides the upper 8 bits then the second provides the lower 8 bits.
You need to produce a conversion that is in 16-bit binary format.

	IOTRAN will do a decimal-to-word signed conversion by:

	>IOTRAN dw SINE

	This does a translation from file SINE.AD to SINE.AW.

	If instead, the 16-bit A/D converter is attached to two ports, providing
the 16-bit word in parallel, you will need 2 files, each one holding the
upper/lower parts of each 16-bit value.

	IOTRAN will do a decimal-to-2 byte signed conversion by:

	>IOTRAN db2 SINE

	Two files, SINE.AB1 and SINE.AB2, will be generated. SINE.AB1 contains
the upper byte of each word, and SINE.AB2 contains the lower byte of each word.

	If you are using a 16-bit simulator (TMS32010, 68000) the decimal-to-word
conversion will be needed for a single port. Similarly, a 32-bit conversion
can be made by:

	>IOTRAN dw2 SINE

	Now we can run AVSIM and attach files SINE.AB, or SINE.AB1 and SINE.AB2
to ports with the I/O facility within AVSIM. Since we want to simulate the
D/A output of RMS power as the program runs, we also attach an output file,"OUTPUT.AB",
to the D/A port assignment and collect binary data. After exiting from AVSIM,
however, the output file cannot be used directly for BASIC input, or LOTUS, etc.

	IOTRAN will convert byte-to-decimal by:

	>IOTRAN bd OUTPUT

	It reads file OUTPUT.AB and generates a list of decimal values in file 
OUTPUT.AD, which can then be printed, or displayed.

	Other conversions include:

wd	- word-to-decimal		file.AW --> file.AD
b2d 	- 2 byte-to-decimal  		file.AB1 & file.AB2 --> file.AD
w2d 	- 2 word-to-decimal		file.AW1 & file.AW2 --> file.AD

	Similarly, conversion from hexadecimal-to-byte or word is possible. A hex
value in ASCII - eg. 1B21 is converted to a binary stream. Use this technique 
for unsigned conversions. 

	Hex conversions include:

hb	- hex-to-byte			file.AH --> file.AB
hw	- hex-to-word			file.AH --> file.AW
hb2	- hex-to-2 byte			file.AH --> file.AB1 & file.AB2
hw2	- hex-to-2 word			file.AH --> file.AW1 & file.AW2
bh	- byte-to-hex			file.AB --> file.AH
wh	- word-to-hex			file.AW --> file.AH
b2h	- 2 byte-to-hex			file.AB1 & file.AB2 --> file.AH
w2h	- 2 word-to-hex			file.AW1 & file.AW2 --> file.AH

Случайные файлы

Файл
144361.rtf
128594.doc
34478.rtf
98218.doc
42474.rtf




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