Rabbit BL2600, User Manual

Page: 66 / 116

60 SBC BL2600
Calibrates the response of a given 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 analog input channel number (0 to 7) corresponding to AIN0–AIN7
opmode is the mode of operation for the specified channel. Use one of the following macros to set the
mode for the channel being configured.
0 = Single-Ended unipolar (0–20 V)
1 = Single-Ended bipolar (±10 V)
2 = Differential bipolar (±20 V)
3 = 4–20 mA
gaincode is the gain code of 0 to 7 (use a gain code of 4 for 4–20 mA operation)
value1
is the first A/D converter value (0–4095).
volts1
is the voltage corresponding to the first A/D converter value.
value2 is the second A/D converter value (0–4095).
volts2
is the voltage corresponding to the second A/D converter value.
int anaInCalib(int channel, int opmode,
int gaincode, int value1, float volts1,
int value2, float volts2);
channel
Single-Ended Differential 4–20 mA
0 +AIN0 +AIN0 -AIN1 +AIN0
1 +AIN1 — +AIN1
2 +AIN2 +AIN2 -AIN3 +AIN2
3 +AIN3 — +AIN3
4 +AIN4 +AIN4 -AIN5
5 +AIN5 —
6 +AIN6 +AIN6 -AIN7
7 +AIN7 —
Gain Code Macro
Voltage Range
Single-Ended
Unipolar
Single-Ended
Bipolar
Differential
Bipolar
0
GAIN_X1
0–20 V ±10 V ± 20 V
1 GAIN_X2 0–10 V ±5 V ± 10 V
2
GAIN_X4
0–5 V ±2.5 V ± 5 V
3 GAIN_X5 0–4 V ±2 V ± 4 V
4
GAIN_X8
0–2.5 V ±1.25 V ± 2.5 V
5 GAIN_X10 0–2 V ±1 V ± 2 V
6
GAIN_X16
0–1.25 V — ± 1.25 V
7
GAIN_X20
0–1 V — ± 1 V