Diff: main.cpp

Revision:

0:c8f89ec4e176

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Jul 10 03:43:53 2012 +0000
@@ -0,0 +1,37 @@
+//  port speed test program
+//  this code is based on ..
+//    http://mbed.org/users/simon/notebook/busout-portout-digitalout-speedup/
+
+#include "mbed.h"
+
+BusOut bus(P1_24, P1_25, P1_26, P1_27, P1_28, P1_29, P1_30, P1_31);
+PortOut port(Port0, 0x00000FF0);
+DigitalOut out(LED1);
+
+Timer t;
+
+int main() {
+//    printf("    ** port speed test **\r\n");
+
+    t.start();
+    for(int i=0; i<1000000; i++) {
+        bus = 0;
+        bus = 0xFF;
+    }
+    printf("    BusOut  = %8d kHz\r\n",(int)( 1000.0 / t));
+
+    t.reset();
+    for(int i=0; i<1000000; i++) {
+        port = 0;
+        port = 0xFF000000;
+    }
+    printf("    PortOut = %8d kHz\r\n", (int)(1000.0 / t));
+    
+    t.reset();
+    for(int i=0; i<1000000; i++) {
+        out = 0;
+        out = 1;
+    }
+    printf("    DigitalOut = %8d kHz\r\n", (int)(1000.0 / t));
+}
+