#define step_width 20
#define step_height 20
static unsigned char step_bits[] = {
   0x00, 0x00, 0x00, 0x18, 0x03, 0x00, 0x14, 0x05, 0x00, 0x18, 0x0b, 0x00,
   0x14, 0x15, 0x00, 0x18, 0x2b, 0x00, 0x14, 0x51, 0x00, 0x18, 0xa3, 0x00,
   0x14, 0x41, 0x01, 0x18, 0x83, 0x03, 0x14, 0xc1, 0x01, 0x18, 0xe3, 0x00,
   0x14, 0x71, 0x00, 0x18, 0x3b, 0x00, 0x14, 0x1d, 0x00, 0x18, 0x0f, 0x00,
   0x14, 0x07, 0x00, 0x1c, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};