SerialFlash: fix compile errors

1. Old SerialFlash directory was still there-- delete it
2. crc16.h is required; I just took a copy from Paul's Teensy cores

Author: eriknyquist

libraries/CurieSerialFlash/util/crc16.h

@@ -0,0 +1,97 @@
+// CRC compatibility, adapted from the C-only comments here:
+// http://svn.savannah.nongnu.org/viewvc/trunk/avr-libc/include/util/crc16.h?revision=933&root=avr-libc&view=markup
+
+/* Copyright (c) 2002, 2003, 2004  Marek Michalkiewicz
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions are met:
+
+   * Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+
+   * Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in
+     the documentation and/or other materials provided with the
+     distribution.
+
+   * Neither the name of the copyright holders nor the names of
+     contributors may be used to endorse or promote products derived
+     from this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+  POSSIBILITY OF SUCH DAMAGE. */
+
+#ifndef _UTIL_CRC16_H_
+#define _UTIL_CRC16_H_
+
+#include <stdint.h>
+
+static inline uint16_t _crc16_update(uint16_t crc, uint8_t data) __attribute__((always_inline, unused));
+static inline uint16_t _crc16_update(uint16_t crc, uint8_t data)
+{
+	unsigned int i;
+
+	crc ^= data;
+	for (i = 0; i < 8; ++i) {
+		if (crc & 1) {
+			crc = (crc >> 1) ^ 0xA001;
+		} else {
+			crc = (crc >> 1);
+		}
+	}
+	return crc;
+}
+
+static inline uint16_t _crc_xmodem_update(uint16_t crc, uint8_t data) __attribute__((always_inline, unused));
+static inline uint16_t _crc_xmodem_update(uint16_t crc, uint8_t data)
+{
+	unsigned int i;
+
+	crc = crc ^ ((uint16_t)data << 8);
+	for (i=0; i<8; i++) {
+		if (crc & 0x8000) {
+			crc = (crc << 1) ^ 0x1021;
+		} else {
+			crc <<= 1;
+		}
+	}
+	return crc;
+}
+
+static inline uint16_t _crc_ccitt_update (uint16_t crc, uint8_t data) __attribute__((always_inline, unused));
+static inline uint16_t _crc_ccitt_update (uint16_t crc, uint8_t data)
+{
+	data ^= (crc & 255);
+	data ^= data << 4;
+
+	return ((((uint16_t)data << 8) | (crc >> 8)) ^ (uint8_t)(data >> 4) 
+		^ ((uint16_t)data << 3));
+}
+
+static inline uint8_t _crc_ibutton_update(uint8_t crc, uint8_t data) __attribute__((always_inline, unused));
+static inline uint8_t _crc_ibutton_update(uint8_t crc, uint8_t data)
+{
+	unsigned int i;
+
+	crc = crc ^ data;
+	for (i = 0; i < 8; i++) {
+		if (crc & 0x01) {
+			crc = (crc >> 1) ^ 0x8C;
+		} else {
+			crc >>= 1;
+		}
+	}
+	return crc;
+}
+
+#endif