Diff: main.cpp

Revision:

0:4414657a2618

Child:

1:d9d6cf136120

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Dec 07 05:31:04 2010 +0000
@@ -0,0 +1,32 @@
+#include "mbed.h"
+
+// Scans through the D/A converter values, and copies a set of A/D converter values to file on USB local filesystem.
+// Connect pin 18 to pin 17.
+
+AnalogOut aout(p18);
+AnalogIn ain(p17);
+LocalFileSystem local("local");               // Create the local filesystem under the name "local"
+
+const int N = 100;
+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.) 
+
+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);    
+    for (i=0;i<1024;i++) {
+        aout.write_u16(i<<6);
+        wait(0.001);
+        for (n=0;n<N;n++) {
+            x[n]=ain.read_u16();
+        }
+        fwrite(x,sizeof(x[0]),sizeof(x)/sizeof(x[0]),fp);
+    }
+    fclose(fp);
+}