added Pi Zero 2 test

main.c

@@ -22,6 +22,12 @@
 #include "main.h"
 
 int main(int argc, char * argv[]) {
+	
+  testStr = "cat /proc/cpuinfo | grep 'Revision' | awk '{print $3}' | sed 's/^1000//' | grep '902120'";
+  FILE *file_test = sopen(testStr);  // see if Pi Zero 2  
+  fgets(resbuffer, 1000, file_test);
+  fprintf(stderr, "test result: %s\n", resbuffer);
+  fclose(file_test);	
 
   sleep(5);  // try sleep at start to help boot