Revision 0:e4b2af8e875a, committed 2010-07-22
- Comitter:
- smpedi
- Date:
- Thu Jul 22 14:24:52 2010 +0000
- Commit message:
Changed in this revision
diff -r 000000000000 -r e4b2af8e875a SigGen.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SigGen.cpp Thu Jul 22 14:24:52 2010 +0000
@@ -0,0 +1,184 @@
+#include "mbed.h"
+
+#define MAXWAVEPTS 20
+#define SQUARE 0
+#define SINE 1
+#define UP 65
+#define DOWN 66
+#define RIGHT 67
+#define LEFT 68
+
+AnalogOut wave(p18);
+Ticker timer;
+float wValue;
+float waveVals[MAXWAVEPTS];
+float *fpW, *fpEnd;
+float fAmp, fModAmp;
+short itype;
+
+void init_wave(int, int);
+void write_wavePt();
+int DoTermIO(char);
+void ChangeRate(float);
+extern float input_control();
+extern void ledOut(int);
+
+DigitalOut oled(p8);
+Serial pc(USBTX, USBRX); // tx, rx
+
+int main() {
+ float rate, delay;
+ unsigned int idelay;
+ char c;
+
+ fAmp = 0.606f;
+ fModAmp = 0.5f;
+ pc.printf("\fFrequency (Hz)? ");
+ pc.scanf("%f",&rate);
+ if (rate > 2000.0f) rate = 2000.0f;
+ pc.printf("\n%f Hz, Got it\nSine (1) or Square? (0)",rate);
+ pc.scanf("%c",&c);
+ itype = c - 48;
+ pc.printf("\nType is %s \n",(itype ? "Sine" : "Square"));
+
+ delay = 1000000 / rate; // delay for one cycle
+ delay = delay / (float)(MAXWAVEPTS - 1); // delay per point
+ idelay = (int)(delay); // delay in int format
+ init_wave((int)MAXWAVEPTS, itype);
+
+ pc.printf("\nrate = %f\n",rate);
+ pc.printf("delay = %f\n",delay);
+ pc.printf("idelay = %u micro-seconds\n",idelay);
+
+ timer.attach_us(&write_wavePt,idelay);
+ oled = 0;
+ while (1) {
+ switch (DoTermIO(pc.getc())) {
+ case 'i':
+ fModAmp *= 1.01;
+ if (fModAmp > 1.0)
+ fModAmp = 1.0;
+ init_wave((int)MAXWAVEPTS, itype);
+ break;
+ case 'd':
+ fModAmp *= 0.99;
+ if (fModAmp < 0.05)
+ fModAmp = 0.05;
+ init_wave((int)MAXWAVEPTS, itype);
+ break;
+
+ case UP:
+ rate += 1.0f;
+ ChangeRate(rate);
+ break;
+ case DOWN:
+ rate -= 1.0f;
+ ChangeRate(rate);
+ break;
+ case RIGHT:
+ rate += 25.0f;
+ ChangeRate(rate);
+ break;
+ case LEFT:
+ rate -= 25.0f;
+ ChangeRate(rate);
+ break;
+ case -1:
+ pc.printf("%c",12);
+ break;
+ }
+ }
+}
+
+int DoTermIO(char c) {
+ char e;
+
+ if (c==17)
+ return(-1);
+
+ if (c == 27) { // escape sequence?
+ e = pc.getc();
+ if (e != 91) {
+ return((int)(-1));
+ }
+ pc.printf("%c",c);
+ return((int)(pc.getc()));
+ }
+ pc.putc(c);
+ return((int)c);
+}
+
+
+void ChangeRate(float val) {
+ int idelay;
+ float delay;
+
+ pc.printf("\f");
+ pc.printf(" FFreq = %8.0f",val);
+
+ delay = 1000000 / val; // delay for one cycle
+ delay = delay / (float)(MAXWAVEPTS - 1); // delay per point
+ idelay = (int)(delay); // delay in int format
+
+ pc.printf("\nrate = %f\n",val);
+ pc.printf("delay = %f\n",delay);
+ pc.printf("idelay = %u micro-seconds\n",idelay);
+ timer.detach();
+ timer = Ticker();
+ timer.attach_us(&write_wavePt,idelay);
+}
+
+
+void write_wavePt
+
+ if (fpW >= fpEnd) {
+ fpW = waveVals;
+ }
+ wave.write(*fpW);
+}
+
+/* load wave array with values. Currently supports square and sine, but any
+ arbitrary wave shape can be defined, as long as it is MAXWAVEPTS long
+*/
+
+void init_wave(int iNumPts, int itype) {
+ int i, iMid;
+ float fddeg, fdeg, pi;
+ float *fp;
+ float amp;
+
+ amp = fAmp * fModAmp;
+ switch (itype) {
+ case SQUARE: // square
+ iMid = iNumPts/2-1;
+ fpW = waveVals;
+ fp = fpW;
+ for (i=0; i<iMid; i++) {
+ *fp = 0.0;
+ fp++;
+ }
+ for (i=iMid; i< iNumPts; i++) {
+ *fp = amp * 2;
+ fp++;
+ }
+ fpEnd = fp-1;
+ break;
+
+ case SINE: // sine
+ pi = 3.1415926;
+ fddeg = ((2.0f * pi) / (float)iNumPts);
+ fpW = waveVals;
+ fp = fpW;
+ fdeg = 0;
+ for (i=0; i<iNumPts; i++) {
+ *fp =( amp * cos(fdeg)) + amp;
+ fp++;
+ fdeg += fddeg;
+ }
+ fpEnd = fp-1;
+
+ break;
+ }
+
+}
+
diff -r 000000000000 -r e4b2af8e875a mbed.bld
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld Thu Jul 22 14:24:52 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/e6be4cd80aad