Revision 1:d9d6cf136120, committed 2010-12-10

Comitter:

Mischa

Date:

Fri Dec 10 05:56:45 2010 +0000

Parent:

0:4414657a2618

Commit message:

Now includes a matlab script to show some of the results (overview.m, included as overview.cpp).

Changed in this revision

--- a/main.cpp	Tue Dec 07 05:31:04 2010 +0000
+++ b/main.cpp	Fri Dec 10 05:56:45 2010 +0000
@@ -11,15 +11,15 @@
 int i;
 int n;
 unsigned short x[N];
-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.) 
+//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.) 
 
 int main() {
     FILE *fp = fopen("/local/out.txt", "w");  // Open "out.txt" on the local file system for writing
-    LPC_ADC->ADTRM&=~0x00F0;  //zero the ADC trim bits
-    LPC_ADC->ADTRM|=(trim<<4) & 0x00F0;   //set the trim
-    LPC_SC->PCONP &= ~(1<<30);
-    LPC_SC->PCONP &= ~(1<<10);    
-    LPC_SC->PCONP &= ~(1<<27);    
+    //LPC_ADC->ADTRM&=~0x00F0;  //zero the ADC trim bits
+    //LPC_ADC->ADTRM|=(trim<<4) & 0x00F0;   //set the trim
+    //LPC_SC->PCONP &= ~(1<<30);  //optionally power down various parts of the lpc1768
+    //LPC_SC->PCONP &= ~(1<<10);    
+    //LPC_SC->PCONP &= ~(1<<27);    
     for (i=0;i<1024;i++) {
         aout.write_u16(i<<6);
         wait(0.001);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/overview.cpp	Fri Dec 10 05:56:45 2010 +0000
@@ -0,0 +1,44 @@
+% matlab code to plot results (multiple files):
+
+fs={'OUT.TXT'
+    'OUTPSU.TXT'
+    'OUTUSBtiedgnd.TXT'
+    'OUTPSUtiedgnd.TXT'
+    'OUTUSBlongwait.TXT'
+    'OUTPSUlongwait.TXT'
+    'OUTUSBtiedgndlongwait.TXT'
+    'OUTPSUtiedgndlongwait.TXT'};
+clear d
+for i=1:numel(fs),
+  fh=fopen(fs{i},'r');
+  d(:,:,i)=fix(fread(fh,[100,1024],'uint16')/16);
+  fclose(fh);
+end
+
+%all the measurements as dots:
+figure
+m=0:1023;
+m=repmat(m*4,[size(d,1),1,size(d,3)]);
+c='rgbmrgbm';
+for i=5:8,
+  plot(m(:,:,i),d(:,:,i),[c(i) '.']); hold on
+end
+axis tight
+
+%statistics:
+d=reshape(d,100*1024,8);
+m=reshape(m,100*1024,8);
+m=m+median(d(:)-m(:));
+top=(d>4096-6 & m<4096-100);
+bottom=(d<6 & m>100);
+above=(d>m+100 & d<=4096-6);
+below=(d<m-100 & d>=6);
+bar(0:7,[sum(bottom); sum(below); sum(above); sum(top)]','stacked')
+
+figure
+plot(m,d,'k.'); hold on
+plot(m(top),d(top),'r.'); hold on
+plot(m(above),d(above),'y.'); hold on
+plot(m(below),d(below),'c.'); hold on
+plot(m(bottom),d(bottom),'b.'); hold on
+axis tight