example_flag.cpp

00001 #include "MicroBit.h"
00002 
00003 #include "Display.h"
00004 #include "common.h"
00005 
00006 
00007 
00008 int8_t pixels[] = 
00009     {4,8,10,12,16,0,4,9,14,19,24,2,7,8,25,0,6,7,8,9,10,12,14,18,-1};
00010     
00011 
00012 int8_t yield() {
00013     static int8_t column=0;
00014     int8_t retval = pixels[column++];
00015     if (retval == -1) {
00016         column=0;
00017         return -1;
00018         }
00019     return retval-1;
00020     }
00021 
00022 
00023 void flag1(int8_t(*yieldF)()) {
00024     for (int8_t i=0; i < 5; i++) {
00025         display.setFlag(6*i);
00026         display.setFlag(4+4*i);
00027         }
00028     }
00029 
00030 void flag2(int8_t(*yieldF)()) {
00031     int8_t p;
00032     while ((p = (yieldF)())!=-1) {
00033         display.setFlag(p);
00034         }
00035     }
00036 
00037 void (*flg[])(int8_t(*yieldF)()) = {flag1,flag2};
00038 
00039 void example_flag() {
00040     int8_t i=0;
00041     while (true) {
00042         display.clear();
00043         (flg[i>0 ? 1 : 0])(yield);
00044         i=(i+1) & 3;
00045         uBit.sleep(2000);
00046         }
00047     }