crc: Move crc7 into CRC single header

Move crc7 into CRC single header

Signed-off-by: Yannis Damigos <[email protected]>

Author: ydamigos

include/crc.h

@@ -3,6 +3,7 @@
  * Copyright (c) 2017 Intel Corporation.
  * Copyright (c) 2017 Nordic Semiconductor ASA
  * Copyright (c) 2015 Runtime Inc
+ * Copyright (c) 2018 Google LLC.
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -155,6 +156,21 @@ u32_t crc32_ieee_update(u32_t crc, const u8_t *data, size_t len);
  */
 u8_t crc8_ccitt(u8_t initial_value, const void *buf, size_t len);
 
+/**
+ * @brief Compute the CRC-7 checksum of a buffer.
+ *
+ * See JESD84-A441.  Used by the MMC protocol.  Uses 0x09 as the
+ * polynomial with no reflection.  The CRC is left
+ * justified, so bit 7 of the result is bit 6 of the CRC.
+ *
+ * @param seed Value to seed the CRC with
+ * @param src Input bytes for the computation
+ * @param len Length of the input in bytes
+ *
+ * @return The computed CRC7 value
+ */
+u8_t crc7_be(u8_t seed, const u8_t *src, size_t len);
+
 /**
  * @}
  */

include/crc7.h

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <crc7.h>
+#include <crc.h>
 
 u8_t crc7_be(u8_t seed, const u8_t *src, size_t len)
 {

lib/crc/crc7_sw.c

@@ -12,8 +12,7 @@ LOG_MODULE_REGISTER(sdhc);
 #include <gpio.h>
 #include <misc/byteorder.h>
 #include <spi.h>
-#include <crc7.h>
-#include <crc16.h>
+#include <crc.h>
 
 #define SDHC_SECTOR_SIZE 512
 #define SDHC_CMD_SIZE 6