Pepper-computer Modular Computers RS485 Bedienungsanleitung PDF herunterladen (Seite 193)

SMART I/O User’s Manual

Chapter 5 Analog Modules

Read Temperature Values

The HW task is prepared with a function that converts RAW values of a

channel to degrees Celsius. To enable this facility, the function

SMADCEnableConversion must be called after calling SMADCEnableRead.

If the HW task has calculated these converted values, the function

SMADCReadConverted can be used to get the value.

Calibration

Before the first value is fetched from the ADC, a calibration cycle is per-

formed by the HW task. The user also has the facility to force the HW task to

execute a calibration cycle by calling either SMADCCalibrate for one

calibration or SMADCSetCyclicCalib. Then a calibration is executed if a user

defined interval has expired.

Deinitialization:

If the task calling the SMADC library function finishes, the function

SMADCDeInit should be called by this task to free memory and resources

otherwise tied up with the application.

Other Functions

For more information on other functions, refer to the description of the

functions later in this document or the example demoadc.c.

LEDs

Both LEDs on the SM-PT100 module are used to show the status of the HW

task. LED1 is the upper one; LED2 is the lower one.

LED1 LED2 Status

off off ADC is not in use

on off Calibration in progress

off on AD conversion in progress

on on Standardization to reference value in progress

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Pepper-computer Modular Computers RS485 Bedienungsanleitung Seite 193