Z-World Wildcat BL2000 User Manual - page 48

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Wildcat (BL2000)

4.4.5  A/D Converter Inputs

Calibrates the response of the A/D converter channel as a linear function using the two conversion points 

provided. Gain and offset constants are calculated and placed into global table 

_adcInCalib

.

PARAMETERS

channel

 is the A/D converter input channel (0–10). 

value1

 is the first A/D converter channel value.

volts1

 is the voltage corresponding to the first A/D converter channel value.

value2

 is the second A/D converter channel value.

volts2

 is the voltage corresponding to the second A/D converter channel value.

RETURN VALUE

0 if successful.

-1 if not able to make calibration constants.

SEE ALSO

anaIn, anaInVolts, brdInit

Reads the voltage of an analog input channel by serially clocking out an 8-bit command to the A/D con-

verter device of the following formats:

TLC2543 commands

D7–D4

Channel 0 - 10

Channel 11 = (V

ref+

 - V

ref-

)/2

Channel 12 = V

ref-

Channel 13 = V

ref+

Channel 14 = software powerdown

D3-D2

Output data length:

01—8 bits    

00—12 bits (normally used as default)

11—16 bits (not supported by driver)

D1

Output data format   

0—MSB first

1—LSB first (not supported by driver)

D0

Mode of operation

0—Unipolar (normally used as default)

1—Bipolar  

void anaInCalib(int channel, int value1, 

float volts1, int value2, float volts2);

int _anaIn(unsigned char cmd, char len);