补充tools目录

app/smart_grid/protocol/tools/proto_crc16.c

@@ -0,0 +1,48 @@
+/****************************************************************************
+
+Copyright(c) 2019 by Aerospace C.Power (Chongqing) Microelectronics. ALL RIGHTS RESERVED.
+
+This Information is proprietary to Aerospace C.Power (Chongqing) Microelectronics and MAY NOT
+be copied by any method or incorporated into another program without
+the express written consent of Aerospace C.Power. This Information or any portion
+thereof remains the property of Aerospace C.Power. The Information contained herein
+is believed to be accurate and Aerospace C.Power assumes no responsibility or
+liability for its use in any way and conveys no license or title under
+any patent or copyright and makes no representation or warranty that this
+Information is free from patent or copyright infringement.
+
+****************************************************************************/
+
+/* common includes */
+#include "iot_config_api.h"
+#include "iot_sg_fr.h"
+#include "iot_errno_api.h"
+#include "iot_crc_api.h"
+
+/* protocol includes */
+#include "proto_crc16.h"
+
+#define PPPGOODFCS16 0xf0b8 /* Good final FCS value */
+
+uint16_t proto_fcs16_check_sum(uint8_t *data, uint16_t length)
+{
+    return (iot_getcrc16_update(0xffff, data, length, 0));
+}
+
+uint16_t proto_fcs16_get_check_sum(uint8_t *data, uint16_t length)
+{
+    uint16_t fcs;
+    fcs = proto_fcs16_check_sum(data, length);
+    fcs ^= 0xffff;
+    return (fcs);
+}
+
+uint32_t proto_fcs16_check(uint8_t* data, uint16_t len)
+{
+    if (PPPGOODFCS16 == proto_fcs16_check_sum(data, len)) {
+        /* crc16 check success */
+        return ERR_OK;
+    }
+    /* crc16 check fail */
+    return ERR_FAIL;
+}