Pepper Computer Modular Computers RS485 - Manual (Page 253)

SMART I/O User’s Manual
©1996 PEP Modular Computers GmbH October 01, 1996 Page 5 - 97
5
Chapter 5 Analog Modules
5.4.8.4 SMADC1GetV
Syntax
error_code SMADC1GetV(u_int8 PortNr, u_int8 Channel,
int16 *pValue);
Description
This function fetches the conversion result of a selected channel. A gain and
offset correction is performed and the result stored as a signed integer value.
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 initialised
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 = SMADC1GetV(0, 2, 0x07FF);
Value (16-bit HEX)
Unipolar Bipolar
Positive Full-Scale $0FFF Positive Full-Scale $07FF
+1LSB $0001 +1LSB $0001
0 $0000 0 $0000
-1LSB $FFFF
Negative Full-Scale $F800