void print_decs(int16_t data);
/* hex */
+void print_hex4(uint8_t data);
void print_hex8(uint8_t data);
void print_hex16(uint16_t data);
void print_hex32(uint32_t data);
/* binary */
+void print_bin4(uint8_t data);
void print_bin8(uint8_t data);
void print_bin16(uint16_t data);
void print_bin32(uint32_t data);