Pepper Computer Modular Computers RS485 - Manual (Page 229)

SMART I/O User’s Manual
©1996 PEP Modular Computers GmbH March 12, 1996 Page 5 - 73
5
Chapter 5 Analog Modules
5.3.8.7 SMADCSetPrecision
Syntax
error_code SMADCSetPrecision(u_int8 PortNr, u_int8
channel, u_int8 precision);
Description
This function checks if an SM-THERM board is fitted on the specified port
and if the channel is valid. It sets the precision of the AD Converter. The
valid precision values are defined in the file smadc.h. Note that large preci-
sion/filter values cause longer AD conversion times.
Input
u_int8 PortNr
Port number to set precision
(from 0 to 10)
u_int8 channel
Number of specified channel (0 to 3)
u_int8 precision
Resolution of ADC; filter value
Output
error_code SUCCESS
E_MNF
If wrong type of module or no module
is fitted on the selected port
E_PARAM
If wrong channel number is specified
E_BMODE
Illegal precision value (must be within
19 to 2000).
or standard OS-9 error code (refer to the OS-9
Technical Manual Error Codes Section).
Example
RetVal = SMADCSetPrecision(0, 1, 0x100);