Pepper-computer Modular Computers RS485 User Manual download pdf (Page 175)

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101

SMART I/O User’s Manual

Chapter 5 Analog Modules

5.1.8.4 SMDAD1GetVRaw

Syntax

error_code SMDAD1GetVRaw(u_int8 PortNr, u_int8

Channel, int16 *pValue);

Description

This function fetches the conversion result of a selected channel without

performing a gain or offset correction. The result is always a signed integer

value. If bipolar mode is selected, the function returns the 2’s complement

value of the original read.

Input

u_int8 PortNr

SM-Port to be accessed

u_int8 Channel

Number of the ADC input channel to access

(0-3)

int16 *pValue

Pointer to the location where the conversion

result will be stored

Output

error_code SUCCESS

E_SEEK

if module was not initialized

E-BMODE

if the module is unknown

or standard OS-9 error code (refer to the OS-9

Technical Manual Error Codes Section).

Example

RetVal = SMDAD1GetVRaw(0, 2, 0x07FF);

Value (16-bit HEX)

Unipolar Bipolar

Positive Full-Scale $07FF Positive Full-Scale $07FF

+1LSB $0001 +1LSB $0001

0 $0000 -1LSB $FFFF

Negative Full-Scale $F800

1 2 ... 170 171 172 173 174 175 176 177 178 179 180 ... 319 320

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