提交: 305700443b12b7e08600c14617233146ac911ec7 - rpi-dmonitor (git)

Commit MetaInfo

• 修訂: 305700443b12b7e08600c14617233146ac911ec7 (tree)
• 時間: 2020-09-16 01:03:13
• 作者: Satoshi Yasuda <7m3tjz@jarl...>
• Commiter: Satoshi Yasuda

Log Message

new file: crc.c
new file: crc.h

Change Summary

• add: crc.c
• add: crc.h

差異

--- /dev/null
+++ b/crc.c
@@ -0,0 +1,52 @@
+#include "crc.h"
+
+/*
+	CRC reslut routine
+ */
+
+unsigned short int		result_crc_dstar(unsigned short int crc)
+{
+
+    unsigned short int tmp;
+
+      crc = ~crc;
+      tmp = crc;
+      crc = (crc << 8) | (tmp >> 8 & 0xff);
+
+    return crc;
+
+}  /* result_crc_dstar */
+
+
+/*
+	CRC update routine
+ */
+unsigned short int	update_crc_dstar( unsigned short int  crc, unsigned char c )
+{
+    unsigned short int tmp, short_c;
+
+    short_c  = 0x00ff &  c;
+	
+    tmp = (crc & 0x00ff) ^ short_c;
+    crc = (crc >> 8)  ^ crc_tabccitt[tmp];
+
+    return crc;
+
+}  /* update_crc_dstar */
+
+#if 0
+unsigned short int crc_calc (unsigned char string[], int length)
+{
+        unsigned short int        temp;
+        int     n;
+
+        temp = 0xffff;
+
+        for (n = 0 ; n < length ; n++)
+        {
+                temp = update_crc_dstar(temp, string[n]);
+        }
+
+        return result_crc_dstar (temp);
+}
+#endif

--- /dev/null
+++ b/crc.h
@@ -0,0 +1,41 @@
+/*
+	CRC Generation table for D-STAR 
+ */
+
+#define POLY 0x8408   /* 0x1021 bit reversed */
+
+
+unsigned short int	crc_tabccitt[256]={
+		0x0000,0x1189,0x2312,0x329b,0x4624,0x57ad,0x6536,0x74bf,
+		0x8c48,0x9dc1,0xaf5a,0xbed3,0xca6c,0xdbe5,0xe97e,0xf8f7,
+		0x1081,0x0108,0x3393,0x221a,0x56a5,0x472c,0x75b7,0x643e,
+		0x9cc9,0x8d40,0xbfdb,0xae52,0xdaed,0xcb64,0xf9ff,0xe876,
+		0x2102,0x308b,0x0210,0x1399,0x6726,0x76af,0x4434,0x55bd,
+		0xad4a,0xbcc3,0x8e58,0x9fd1,0xeb6e,0xfae7,0xc87c,0xd9f5,
+		0x3183,0x200a,0x1291,0x0318,0x77a7,0x662e,0x54b5,0x453c,
+		0xbdcb,0xac42,0x9ed9,0x8f50,0xfbef,0xea66,0xd8fd,0xc974,
+		0x4204,0x538d,0x6116,0x709f,0x0420,0x15a9,0x2732,0x36bb,
+		0xce4c,0xdfc5,0xed5e,0xfcd7,0x8868,0x99e1,0xab7a,0xbaf3,
+		0x5285,0x430c,0x7197,0x601e,0x14a1,0x0528,0x37b3,0x263a,
+		0xdecd,0xcf44,0xfddf,0xec56,0x98e9,0x8960,0xbbfb,0xaa72,
+		0x6306,0x728f,0x4014,0x519d,0x2522,0x34ab,0x0630,0x17b9,
+		0xef4e,0xfec7,0xcc5c,0xddd5,0xa96a,0xb8e3,0x8a78,0x9bf1,
+		0x7387,0x620e,0x5095,0x411c,0x35a3,0x242a,0x16b1,0x0738,
+		0xffcf,0xee46,0xdcdd,0xcd54,0xb9eb,0xa862,0x9af9,0x8b70,
+		0x8408,0x9581,0xa71a,0xb693,0xc22c,0xd3a5,0xe13e,0xf0b7,
+		0x0840,0x19c9,0x2b52,0x3adb,0x4e64,0x5fed,0x6d76,0x7cff,
+		0x9489,0x8500,0xb79b,0xa612,0xd2ad,0xc324,0xf1bf,0xe036,
+		0x18c1,0x0948,0x3bd3,0x2a5a,0x5ee5,0x4f6c,0x7df7,0x6c7e,
+		0xa50a,0xb483,0x8618,0x9791,0xe32e,0xf2a7,0xc03c,0xd1b5,
+		0x2942,0x38cb,0x0a50,0x1bd9,0x6f66,0x7eef,0x4c74,0x5dfd,
+		0xb58b,0xa402,0x9699,0x8710,0xf3af,0xe226,0xd0bd,0xc134,
+		0x39c3,0x284a,0x1ad1,0x0b58,0x7fe7,0x6e6e,0x5cf5,0x4d7c,
+		0xc60c,0xd785,0xe51e,0xf497,0x8028,0x91a1,0xa33a,0xb2b3,
+		0x4a44,0x5bcd,0x6956,0x78df,0x0c60,0x1de9,0x2f72,0x3efb,
+		0xd68d,0xc704,0xf59f,0xe416,0x90a9,0x8120,0xb3bb,0xa232,
+		0x5ac5,0x4b4c,0x79d7,0x685e,0x1ce1,0x0d68,0x3ff3,0x2e7a,
+		0xe70e,0xf687,0xc41c,0xd595,0xa12a,0xb0a3,0x8238,0x93b1,
+		0x6b46,0x7acf,0x4854,0x59dd,0x2d62,0x3ceb,0x0e70,0x1ff9,
+		0xf78f,0xe606,0xd49d,0xc514,0xb1ab,0xa022,0x92b9,0x8330,
+		0x7bc7,0x6a4e,0x58d5,0x495c,0x3de3,0x2c6a,0x1ef1,0x0f78
+	};