Diff: main.cpp

Revision:

0:08bd44467cf7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Jun 06 15:24:34 2015 +0000
@@ -0,0 +1,187 @@
+#include "mbed.h"
+
+//simple benchmark, see main for results  
+
+DigitalOut led(LED1);
+
+
+AnalogIn   Ain(A0);       
+
+
+Serial pc(USBTX, USBRX); // tx, rx
+
+Timer Tim, Timc;
+int dt;
+float dtavg;
+
+
+#define Nsamp 2000
+unsigned short samples[Nsamp];   //analogin sample table 
+
+volatile float x,s;  //volatile to prevent compiler from optimizing loops
+volatile float y;
+
+volatile double dx, ds;
+volatile double dy;  
+
+volatile long ix,iy,is;
+
+//************************
+inline void test_acq()
+{
+    int N=Nsamp;
+      register int i;
+         Tim.reset(); Tim.start();
+      for(i=0; i<N; i++) {
+        samples[i] = Ain.read_u16();
+    }
+    Tim.stop();
+    dt=Tim.read_us(); 
+    dtavg=dt/(float) Nsamp;
+    pc.printf(" input of %d values: total %d, avg: %f \r\n",N, dt, dtavg);
+    
+}
+
+
+
+inline void testmullong()
+{
+int N=100000;
+
+x=Timc.read_ms(); y=Timc.read_ms();
+Tim.reset(); Tim.start();
+Timc.start();
+
+for(int i=0; i<N; i++) {
+       is=is+ix*iy;
+    }
+    Tim.stop();
+    dt=Tim.read_us(); 
+    dtavg=dt/(float)N;
+    pc.printf(" add-mult of %d longs: total %d, avg: %f \r\n", N, dt, dtavg);
+   
+}
+
+
+inline void testmulfloat()
+{
+int N=100000;
+
+x=Timc; y=Timc;
+Tim.reset(); Tim.start();
+
+
+for(int i=0; i<N; i++) {
+       s=s+x*y;
+    }
+    Tim.stop();
+    dt=Tim.read_us(); 
+    dtavg=dt/(float)N;
+    pc.printf(" add-mult of %d floats: total %d, avg: %f \r\n", N, dt, dtavg);
+   
+}
+
+
+inline void testdivfloat()
+{
+int N=100000;
+
+x=Timc; y=Timc;
+Tim.reset(); Tim.start();
+
+
+for(int i=0; i<N; i++) {
+       s=s+x/y;
+    }
+    Tim.stop();
+    dt=Tim.read_us(); 
+    dtavg=dt/(float)N;
+    pc.printf(" add-div of %d floats: total %d, avg: %f \r\n", N, dt, dtavg);
+   
+}
+
+
+inline void testsin()
+{
+int N=10000;
+
+x=Timc; 
+Tim.reset(); Tim.start();
+
+
+for(int i=0; i<N; i++) {
+       s=s+sin(x);
+    }
+    Tim.stop();
+    dt=Tim.read_us(); 
+    dtavg=dt/(float)N;
+    pc.printf(" add-sin of %d floats: total %d, avg: %f \r\n", N, dt, dtavg);
+   
+}
+
+
+inline void testmuldouble()
+{
+int N=100000;
+
+dx=Timc; dy=Timc;
+Tim.reset(); Tim.start();
+
+for(int i=0; i<N; i++) {
+       ds=ds+dx*dy;
+    }
+    Tim.stop();
+    dt=Tim.read_us(); 
+    dtavg=dt/(float)N;
+    pc.printf(" add-mult of %d doubles: total %d, avg: %f \r\n", N, dt, dtavg);
+   
+}
+
+
+inline void testdivdouble()
+{
+int N=100000;
+
+dx=Timc; dy=Timc;
+Tim.reset(); Tim.start();
+
+for(int i=0; i<N; i++) {
+       ds=ds+dx/dy;
+    }
+    Tim.stop();
+    dt=Tim.read_us(); 
+    dtavg=dt/(float)N;
+    pc.printf("add-div of %d doubles: total %d, avg: %f \r\n", N, dt, dtavg);
+   
+}
+
+
+
+//**********************
+
+int main() {
+
+
+  //pc.baud(115200);  //set terminal to 115200 baud
+  
+    pc.printf("start\n");
+    
+    Tim.reset();
+    led=0;
+
+    while(1) 
+    {
+        led = 1-led; 
+           pc.printf("\n\n ");
+      test_acq();  //KL25z: 32.6us per loop;  F303RE: 8.1us per loop
+      testmullong();  //KL25z: 0.25  F303RE: 0.132
+      testmulfloat();  //KL25z: 2.61  F303RE: 0.187
+      testdivfloat(); // KL25z: 3.68     F303RE: 0.35   
+      testsin();      //KL25z: 13.6      F303RE: 1.57
+      testmuldouble();  //KL25z: 8.44  F303RE: 6.84
+      testdivdouble();  //KL25z: 13.7 F303RE: 17.5
+      
+      wait(1); 
+    }
+    
+}