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98640A Analog Input Interface
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mname ADCF AS TREAD
Assembly language routine to read one channel from the ADC
card at the specified gain and return the raw data value.
src MODULE ADCFASTREAD;
src
src EXPORT
src
src TYPE
sc
=
7 .. 31;
src
chan num
=
0 .. 7;
src
gain-index
=
0 .. 3; { Maps to 1,8,64,512 gains}
src
raw data
=
-32768 .. 32767;
src
src PROCEDURE read_adc(select_code: sc;
src
chan: chan _ num ;
src
gain: gain index;
src
VAR
value:-raw_data);
src
src
src END;
def adcfastread adcfastread
def adcfastread read adc
*
module initialization routine
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adcfastread adcfastread rts
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If called from Pascal with normal checking enabled, no range checking
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required on parameters.
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Stack Frame At Entry:
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16(a6)
select code
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14(a6)
chan
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12(a6)
gain
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8(a6)
pointer to value
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4(a6)
return address
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(a6)
stack frame
<--
SP
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register utilization:
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AO
DO
D1
D2
register address
misc. temporary storage, pipeline counter
physical register displacement, value temporary storage
base address (select code
*
10000H
+ 600000H)
4-8
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