4 /* HELPER SUBROUTINES DECLARATIONS */
5 static void start_condition();
6 static void stop_condition();
8 static int ack10_recv();
12 extern void tm1637_init();
13 extern int set_grid(uint8_t offset, char value, bool dot);
14 extern int set_display(bool on, uint8_t degree);
16 extern void tm1637_example();