Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	bit shifting operators
From:	"[email protected]" <[email protected]>
To:	[email protected]
Date:	Tue, 28 Jun 2016 11:30:01 +0200

Hello,

I am trying to read the voltag from an 8-channel adc via I2C.

My result is a 16 bit value (for example 0010 0000 0010 0000). The bits15-12 "0010" respresent the channel (Ch1=0, CH2=1, CH3=2 ....).

I can get the channel value with a SHFT-field:

record( longin, "ADC:RESULT" ) {
field( DTYP, "stream" )
field( INP, "@adc.proto readReg($(ID)) I2C" )
}

record( mbbiDirect, "ADC:RESULT:CHANNEL" ) {
field( DTYP, "Raw Soft Channel" )
field( INP, "ADC:RESULT.VAL")
field(SHFT, "12")

}

Now I want to get the first bits 0-12 and convert the value to voltage-value. To convert this value I use the "ASLO"-field.

But I don't know which is the best way to get the value of the first 12 bits.

Thanks,

Raul

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ANJ, 15 Jul 2016