#define wait_for_tx_free() do { } while(0)
extern char sci_tx_buf[BUFFER_LEN];
extern volatile char sci_rx_buf[BUFFER_LEN];
extern volatile u8 sci_have_packet;
extern volatile bool sci_echo;
#define wait_for_tx_free() do { } while(0)
extern char sci_tx_buf[BUFFER_LEN];
extern volatile char sci_rx_buf[BUFFER_LEN];
extern volatile u8 sci_have_packet;
extern volatile bool sci_echo;