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Feb 6th, 2015
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  1. void vsync(DISPMANX_UPDATE_HANDLE_T u, void* arg) {
  2. FILE *fh = fopen("/sys/class/gpio/gpio4/value","w");
  3. fwrite("1",2,1,fh);
  4. fclose(fh);
  5. fh = fopen("/sys/class/gpio/gpio4/value","w");
  6. fwrite("0",2,1,fh);
  7. fclose(fh);
  8. }
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