main.cpp

00001 #include "mbed.h"
00002 #include "FastIO.h"
00003 
00004 //DigitalOut bitstream(p8);
00005 FastOut<p8> bitstream;
00006 DigitalOut myled(LED1);
00007 
00008 Serial     pc(USBTX, USBRX); // tx, rx
00009 Timer      timer;
00010 
00011 #define  LOOP 1000000
00012 
00013 int main() {
00014     int data[42];
00015     data[ 0] = 0;
00016     data[ 1] = 1;
00017     data[ 2] = 0;
00018     data[ 3] = 0;
00019     data[ 4] = 1;
00020     data[ 5] = 1;
00021     data[ 6] = 0;
00022     data[ 7] = 0;
00023     data[ 8] = 0;
00024     data[ 9] = 1;
00025     data[10] = 1;
00026     data[11] = 1;
00027     data[12] = 0;
00028     data[13] = 0;
00029     data[14] = 0;
00030     data[15] = 0;
00031     data[16] = 1;
00032     data[17] = 1;
00033     data[18] = 1;
00034     data[19] = 1;
00035     data[20] = 0;
00036     data[21] = 0;
00037     data[22] = 0;
00038     data[23] = 0;
00039     data[24] = 0;
00040     data[25] = 1;
00041     data[26] = 1;
00042     data[27] = 1;
00043     data[28] = 1;
00044     data[29] = 1;
00045     data[30] = 0;
00046     data[31] = 0;
00047     data[32] = 0;
00048     data[33] = 0;
00049     data[34] = 0;
00050     data[35] = 0;
00051     data[36] = 1;
00052     data[37] = 1;
00053     data[38] = 1;
00054     data[39] = 1;
00055     data[40] = 1;
00056     data[41] = 1;
00057     int index = 0;
00058     int   dummy;
00059     int   iter_incr = 1;
00060     float duration;
00061     pc.baud(115200);
00062     pc.printf("Start\n");
00063     timer.reset();
00064     timer.start();
00065 loop:
00066     for (int i = 0; i < LOOP; i+=iter_incr) {
00067         bitstream = data[index];
00068         index = (index+1)%42;
00069         /* Begin of useless calculation to force 1 MHz runtime */
00070         dummy = 3;
00071         for (int j = 0; j <51; j++) {
00072             dummy+=dummy;
00073         }
00074         /* End of useless calculation to force 1 MHz runtime */
00075     }
00076     timer.stop();
00077     duration = timer.read();
00078     pc.printf("Loop took %f seconds, %g per iteration\n",duration,duration/LOOP);
00079     /* After testing the speed of the loop during 1 second, now continu to run it forever. */
00080     iter_incr = 0;
00081     goto loop;
00082 }