main.cpp

00001 #include "mbed.h"
00002 
00003 // Scans through the D/A converter values, and copies a set of A/D converter values to file on USB local filesystem.
00004 // Connect pin 18 to pin 17.
00005 
00006 AnalogOut aout(p18);
00007 AnalogIn ain(p17);
00008 LocalFileSystem local("local");               // Create the local filesystem under the name "local"
00009 
00010 const int N = 100;
00011 int i;
00012 int n;
00013 unsigned short x[N];
00014 //short trim = 3; // ADC trim; appears this is added to the ADC readings (i.e, -8 gives results in too low readings, 0 gives about correct readings, +3 gives really correct readings for my system, and +7 gives too high readings.) 
00015 
00016 int main() {
00017     FILE *fp = fopen("/local/out.txt", "w");  // Open "out.txt" on the local file system for writing
00018     //LPC_ADC->ADTRM&=~0x00F0;  //zero the ADC trim bits
00019     //LPC_ADC->ADTRM|=(trim<<4) & 0x00F0;   //set the trim
00020     //LPC_SC->PCONP &= ~(1<<30);  //optionally power down various parts of the lpc1768
00021     //LPC_SC->PCONP &= ~(1<<10);    
00022     //LPC_SC->PCONP &= ~(1<<27);    
00023     for (i=0;i<1024;i++) {
00024         aout.write_u16(i<<6);
00025         wait(0.001);
00026         for (n=0;n<N;n++) {
00027             x[n]=ain.read_u16();
00028         }
00029         fwrite(x,sizeof(x[0]),sizeof(x)/sizeof(x[0]),fp);
00030     }
00031     fclose(fp);
00032 }