avr/buffer.c

   1 /*
   2  * Copyright (C) 2007 Anton Blad
   3  * Copyright (C) 2007 Fredrik Kuivinen
   4  * Copyright (C) 2007 Jakob Rosén
   5  *
   6  * This file is licensed under GPL v2.
   7  */
   8
   9 #include <util/crc16.h>
  10 #include "buffer.h"
  11
  12 volatile enum buffer_status buffer_flags = BUFFER_OK;
  13 volatile uint16_t buffer[BUFFER_CAPACITY];
  14 volatile buf_t buffer_start = 0;
  15 volatile buf_t buffer_size = 0;
  16 volatile uint16_t buffer_crc = 0xffff;
  17 volatile uint32_t buffer_crc_len = 0;
  18
  19 void update_crc(uint16_t w)
  20 {
  21         buffer_crc = _crc16_update(buffer_crc, w >> 8);
  22         buffer_crc = _crc16_update(buffer_crc, w & 0xff);
  23         buffer_crc_len++;
  24 }