Pepper-computer Modular Computers RS485 Bedienungsanleitung PDF herunterladen (Seite 192)

SMART I/O User’s Manual

March 12, 1996

Page 5 - 36

Chapter 5 Analog Modules

To compile the source, execute the following commands at the shell prompt:

> chd /<dev>/APPLIC/SMART

> make all

To execute the example:

load /<dev>/BSP/SMART/SMADC/adc_task * load HW task

load /<dev>/APPLIC/SMART/CMDS/demoadc * load example

demoadc [slot]

Slot = 0,1 .. 10 specifies the port of the SM-PT100 module. (Default = 0)

Note that the procedure names are generic and are applicable to both the SM-

PT100 and SM-THERM modules.

Initialization

To start the HW Task, the OS-9 module adc_task must be loaded, then the

function SMADCInit must be called. To read data from a channel, the type of

sensor attached to it must be known. The PEP header file BSP/SMART/

SMADC/DEFS/smadc.h contains a list of sensors that are supported. To set

the sensor type, the function SMADCSetSensorType needs to be called.

Read RAW Data

To force the HW task to read RAW data from a channel, the function

SMADCEnableRead must be called. As soon as the HW task has received

data from this channel, a flag is set indicating a valid RAW value. Now the

user’s application is able to read this value by using the function

SMADCReadRaw.

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