+
+void print_lf(void);
+void print_crlf(void);
+
+
+/* print string stored in program memory(FLASH)
+ * print_P(PSTR("hello world");
+ * This consumes relatively abundant FLASH memory area not SRAM.
+ */
+#define print_P(s) xputs(s)
+
+/* decimal */
+#define print_dec(i) xprintf("%u", i)
+#define print_decs(i) xprintf("%d", i)
+
+/* hex */
+#define print_hex4(i) xprintf("%X", i)
+#define print_hex8(i) xprintf("%02X", i)
+#define print_hex16(i) xprintf("%04X", i)
+#define print_hex32(i) xprintf("%08lX", i)
+
+/* binary */
+#define print_bin4(i) xprintf("%04b", i)
+#define print_bin8(i) xprintf("%08b", i)
+#define print_bin16(i) xprintf("%016b", i)
+#define print_bin32(i) xprintf("%032lb", i)
+
+#define print_bin_reverse8(i) xprintf("%08b", bitrev(i))
+#define print_bin_reverse16(i) xprintf("%016b", bitrev16(i))
+#define print_bin_reverse32(i) xprintf("%032lb", bitrev32(i))
+
+#ifdef __cplusplus
+}
+#endif
+
+#else
+
+#define print_set_sendchar(func)
+#define print_S(s)
+#define print_P(s)
+#define print_dec(data)
+#define print_decs(data)
+#define print_hex4(data)
+#define print_hex8(data)
+#define print_hex16(data)
+#define print_hex32(data)
+#define print_bin4(data)
+#define print_bin8(data)
+#define print_bin16(data)
+#define print_bin32(data)
+#define print_bin_reverse8(data)
+#define print_bin_reverse16(data)
+#define print_bin_reverse32(data)
+
+#endif
+