TsctlDIOGetAsyncCExamples

int main(int argc,char *argv[]) {
  System *sys;
  DIO *dio;
  int n;
  DIOState state;

  if (argc < 2) {
    printf("usage: %s <dio#>\n",argv[0]);
    return 1;
  }
  sys = SystemInit(0);
  dio = DIOInit(0);
  if (!dio) {
    printf("Error instantiating DIO 0\n");
    return 1;
  }

  // if argument isn't a number, do a lookup
  n = atoi(argv[1]);
  if (n == 0 && argv[1][0] != '0') {
    // Note that we have to pass our C string to ASCIIZ
    // to get the libtsctl array expected by MapLookup
    // for a longer running program we would ArrayFree() it when done...
    n = sys->MapLookup(sys,ASCIIZ(argv[1]));
    if (n < 0) {
      printf("DIO %s not found\n",argv[1]);
    }
  }

 dio->Lock(dio,n,0);
 state = dio->GetAsync(dio,n);
 dio->Unlock(dio,n,0);

 printf("DIO %s state is %s\n",argv[1],DIOValueString(state));
 return 0;
}