Mischa Megens / Mbed 2 deprecated dacadctodiskshort

Scans through the D/A converter values, and copies a set of A/D converter readings to a file on USB local filesystem. Connect pin 18 to pin 17.

Dependencies:   mbed

main.cpp@1:d9d6cf136120, 2010-12-10 (annotated)

Committer:
Mischa
Date:
Fri Dec 10 05:56:45 2010 +0000
Revision:
1:d9d6cf136120
Parent:
0:4414657a2618 
Now includes a matlab script to show some of the results (overview.m, included as overview.cpp).

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Mischa 0:4414657a2618 1 #include "mbed.h"
Mischa 0:4414657a2618 2
Mischa 0:4414657a2618 3 // Scans through the D/A converter values, and copies a set of A/D converter values to file on USB local filesystem.
Mischa 0:4414657a2618 4 // Connect pin 18 to pin 17.
Mischa 0:4414657a2618 5
Mischa 0:4414657a2618 6 AnalogOut aout(p18);
Mischa 0:4414657a2618 7 AnalogIn ain(p17);
Mischa 0:4414657a2618 8 LocalFileSystem local("local"); // Create the local filesystem under the name "local"
Mischa 0:4414657a2618 9
Mischa 0:4414657a2618 10 const int N = 100;
Mischa 0:4414657a2618 11 int i;
Mischa 0:4414657a2618 12 int n;
Mischa 0:4414657a2618 13 unsigned short x[N];
Mischa 1:d9d6cf136120 14 //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.)
Mischa 0:4414657a2618 15
Mischa 0:4414657a2618 16 int main() {
Mischa 0:4414657a2618 17 FILE *fp = fopen("/local/out.txt", "w"); // Open "out.txt" on the local file system for writing
Mischa 1:d9d6cf136120 18 //LPC_ADC->ADTRM&=~0x00F0; //zero the ADC trim bits
Mischa 1:d9d6cf136120 19 //LPC_ADC->ADTRM|=(trim<<4) & 0x00F0; //set the trim
Mischa 1:d9d6cf136120 20 //LPC_SC->PCONP &= ~(1<<30); //optionally power down various parts of the lpc1768
Mischa 1:d9d6cf136120 21 //LPC_SC->PCONP &= ~(1<<10);
Mischa 1:d9d6cf136120 22 //LPC_SC->PCONP &= ~(1<<27);
Mischa 0:4414657a2618 23 for (i=0;i<1024;i++) {
Mischa 0:4414657a2618 24 aout.write_u16(i<<6);
Mischa 0:4414657a2618 25 wait(0.001);
Mischa 0:4414657a2618 26 for (n=0;n<N;n++) {
Mischa 0:4414657a2618 27 x[n]=ain.read_u16();
Mischa 0:4414657a2618 28 }
Mischa 0:4414657a2618 29 fwrite(x,sizeof(x[0]),sizeof(x)/sizeof(x[0]),fp);
Mischa 0:4414657a2618 30 }
Mischa 0:4414657a2618 31 fclose(fp);
Mischa 0:4414657a2618 32 }