#define step_width 16
#define step_height 16
static unsigned char step_bits[] = {
   0x08, 0x00, 0x08, 0x00, 0x08, 0x00, 0x08, 0x00, 0x08, 0x00, 0xf8, 0x01,
   0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x3f, 0x00, 0x20,
   0x00, 0x20, 0x00, 0x20, 0x00, 0x20, 0x00, 0x20};