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.
main.cpp
- Committer:
- Mischa
- Date:
- 2010-12-07
- Revision:
- 0:4414657a2618
- Child:
- 1:d9d6cf136120
File content as of revision 0:4414657a2618:
#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); }