CTI MPG401, User Manual

Mini PCIe ADC  

Users Guide 

www.connecttech.com

Document: CTIM-00149 
Revision: 0.02 

Page 15 of 22 

Connect Tech Inc.  800-426-8979 | 519-836-1291

Date: 2018-10-25 

Example B – ADC Operation with different input range 

In this example we will set: 

-

ADC0 to take a readings from CH0 with an input voltage range of +/-10.24V  

-

ADC1 to take a readings from CH0 with an input voltage range of  +10.24V  

printf(

"ADC0&1: enabling chan0 and setting input range\n"

); 

control_config = 0x80;  
CTIFPGAWrWord(pbrd, BarIndex, ADC0+CONTROL_CONFIG, control_config); 
CTIFPGAWrWord(pbrd, BarIndex, ADC1+CONTROL_CONFIG, control_config);   

input_range = 0x0; 
CTIFPGAWrDword(pbrd, BarIndex, ADC0+INPUT_RANGE_SELECT, input_range);

input_range = 0x0; 

for

(ch=0;ch<8;ch++) 

{ 

input_range|= (0x5 << (3*ch)); 

} 
CTIFPGAWrDword(pbrd, BarIndex, ADC1+INPUT_RANGE_SELECT, input_range);

printf(

"\nReading ADC Voltages...\n"

); 

i=0; 
CTIFPGARdWord(pbrd, BarIndex, ADC0+CH0_LAST(i*2), &testreg); 
ADC0votlage = testreg * (20.48/0x10000) - 0x8000 * (20.48/0x10000);   
 

printf(

"ADC0 Ch%d, Address %x, CODE=%04x Voltage=%08f\n"

, i, ADC0+CH0_LAST(i*2),testreg, ADC0votlage); 

 
i=0; 
CTIFPGARdWord(pbrd, BarIndex, ADC1+CH0_LAST(i*2), &testreg); 
ADC1votlage = testreg * (20.48/0x10000);  
 

printf(

"ADC1 Ch%d, Address %x, CODE=%04x Voltage=%08f\n"

, i, ADC1+CH0_LAST(i*2),testreg, ADC1votlage);