-volatile uint8_t recv_buf[32];
-uint8_t recv_head = 0;
-uint8_t recv_tail = 0;
-volatile uint8_t recv_fill = 0;
-volatile uint8_t recv_overrun = 0;
+static uint8_t cmd_buffer[15];
+static uint8_t cmd_length = 0;
+static uint8_t cmd_read_pos = 0;
+static uint16_t baud_rate = 9600;
+static uint16_t baud_change = 0;
+static uint32_t baud_changed_at = 0;