source: multiio/pcmmio/original/getall.c @ 1cbabbe

/* 
 * Demonstration program for use with the WinSystems PCM-MIO driver
 *
 *      $Id$
 *
 * Compile for GNU/Linux with:
 *
 *    gcc -static getall.c mio_io.o -o getall
 */

#include <stdio.h>
#include <stdlib.h>
#include "mio_io.h"

/* This program demonstrates usage of the adc_convert_all_channels
 * function call.  This allows for all 16 channels to be quickly converted
 * and the results passed back in an 16 element array. Note that this
 * function does not return voltage values, it returns raw 16-bit data
 * directly from the converter.
 */


/* This array will receive the result values for all 16 channels */

unsigned short values[16];

int main(void)
{
int channel;
unsigned short result;
float current;

                /* We set the mode on all 16 channels to single-ended bipolar +/- 10V scale.
                   This allows for any device legal input voltages.
                */
                
                for(channel=0; channel < 16; channel++)
                {                       
                        adc_set_channel_mode(channel,ADC_SINGLE_ENDED,ADC_BIPOLAR,ADC_TOP_10V);
                        
                        /* Check for an error by loooking at mio_error_code */
                        
                        if(mio_error_code)
                        {
                                /* If an error occurs, print out the string and exit */

                                printf("%s - Aborting\n",mio_error_string);
                                exit(1);
                        }
                }
                
                /* This is it! When this function returns the values from all 8 channels
                           will be present in the values array.
                */
                        
                adc_convert_all_channels(values);
                        
                /* Check for possible errors */
                        
                if(mio_error_code)
                {
                        printf("%s - Aborting\n",mio_error_string);
                        exit(1);
                }       
                        
                /* Now we'll extract the data, convert it to volts, and display the results */
                        
                for(channel =0; channel <16; channel++)
                {
                        /* This is for print formatting */

                        if(channel == 4 || channel == 8 || channel == 12)
                                printf("\n");
                        
                        /* Get a result from the array */
                                
                        result = values[channel];
                        
                        /* Convert the raw value to voltage */

                        current = adc_convert_to_volts(channel,result);

                        /* Display the result */
                                                
                        printf("CH%2d%8.4f | ",channel,current);
                }
                
                printf("\n\n");
}