User`s manual

BL4S100 User’s Manual 80

4.4.5 A/D Converter Inputs

anaInConfig

void anaInConfig(int channel, int opmode);

FUNCTION DESCRIPTION

Configures an A/D converter input channel for a given mode of operation. This function

must be called before accessing the A/D converter chip.

The channel pairs for the differential mode are listed below.

AIN0 and AIN1

AIN2 and AIN3

AIN4 and AIN5

AIN6 and AIN7

The modes of operation are as follows:

Single-ended unipolar 0–20 V

Differential bipolar ±20 V

4-20 mA operation

NOTE: When a pin in a differential pair is reconfigured as a nondifferential pin, the

remaining paired pin is also reconfigured.

PARAMETERS

channel analog input channel, 0–7 (AIN0–AIN7)

opmode selects the mode of operation for the A/D converter channel pair.

The values are as follows:

SE0_MODE — single-ended unipolar (0–20 V)

DIFF_MODE — differential bipolar (±20 V)

mAMP_MODE — 4–20 mA operation

RETURN VALUE:

0 — success.

-EINVAL — invalid parameter.