1 files changed, 98 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/ant/ant_fs/crc.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/ant/ant_fs/crc.c
new file mode 100644
index 0000000..ee26d88
--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/ant/ant_fs/crc.c
@@ -0,0 +1,98 @@
+/**
+ * This software is subject to the ANT+ Shared Source License
+ * www.thisisant.com/swlicenses
+ * Copyright (c) Dynastream Innovations, Inc. 2012
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ * 1) Redistributions of source code must retain the above
+ *    copyright notice, this list of conditions and the following
+ *    disclaimer.
+ * 
+ * 2) 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.
+ * 
+ * 3) Neither the name of Dynastream nor the names of its
+ *    contributors may be used to endorse or promote products
+ *    derived from this software without specific prior
+ *    written permission.
+ * 
+ * The following actions are prohibited:
+ * 1) Redistribution of source code containing the ANT+ Network
+ *    Key. The ANT+ Network Key is available to ANT+ Adopters.
+ *    Please refer to http://thisisant.com to become an ANT+
+ *    Adopter and access the key.
+ * 
+ * 2) Reverse engineering, decompilation, and/or disassembly of
+ *    software provided in binary form under this license.
+ * 
+ * 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 HEREBY
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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; DAMAGE TO ANY DEVICE, 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. SOME STATES DO NOT ALLOW
+ * THE EXCLUSION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE
+ * ABOVE LIMITATIONS MAY NOT APPLY TO YOU.
+ * 
+ */
+#include "crc.h"
+#include "compiler_abstraction.h"
+
+
+/**@brief Function for updating the current CRC-16 value for a single byte input.
+ *
+ * @param[in] current_crc The current calculated CRC-16 value.
+ * @param[in] byte        The input data byte for the computation.
+ *
+ * @return The updated CRC-16 value, based on the input supplied.
+ */
+static __INLINE uint16_t crc16_get(uint16_t current_crc, uint8_t byte)
+{
+    static const uint16_t crc16_table[16] =
+    {
+        0x0000, 0xCC01, 0xD801, 0x1400, 0xF001, 0x3C00, 0x2800, 0xE401,
+        0xA001, 0x6C00, 0x7800, 0xB401, 0x5000, 0x9C01, 0x8801, 0x4400
+    };
+
+    uint16_t temp;
+
+    // Compute checksum of lower four bits of a byte.
+    temp         = crc16_table[current_crc & 0xF];
+    current_crc  = (current_crc >> 4u) & 0x0FFFu;
+    current_crc  = current_crc ^ temp ^ crc16_table[byte & 0xF];
+
+    // Now compute checksum of upper four bits of a byte.
+    temp         = crc16_table[current_crc & 0xF];
+    current_crc  = (current_crc >> 4u) & 0x0FFFu;
+    current_crc  = current_crc ^ temp ^ crc16_table[(byte >> 4u) & 0xF];
+
+    return current_crc;
+}
+
+
+uint16_t crc_crc16_update(uint16_t current_crc, const volatile void * p_data, uint32_t size)
+{
+    uint8_t * p_block = (uint8_t *)p_data;
+
+    while (size != 0)
+    {
+        current_crc = crc16_get(current_crc, *p_block);
+        p_block++;
+        size--;
+    }
+
+   return current_crc;
+}