更新EsptouchForIOS

2020-06-10 20:27:25 +08:00
parent 1f69653c19
commit b8d6ad08ea
42 changed files with 1625 additions and 853 deletions
@@ -0,0 +1,80 @@
+//
+//  ESP_CRC8.m
+//  EspTouchDemo
+//
+//  Created by fby on 3/23/15.
+//  Copyright (c) 2015 fby. All rights reserved.
+//
+
+#import "ESP_CRC8.h"
+
+@implementation ESP_CRC8
+
+static ushort crcTable[256];
+
+NSNumber *_init;
+NSNumber *_value;
+
+(void) initialize
+{
+    for (ushort dividend=0; dividend < 256; dividend++)
+    {
+        ushort remainder = dividend;
+        for (ushort bit = 0; bit < 8; ++bit)
+        {
+            if ((remainder & 0x01) != 0)
+            {
+                remainder = (remainder >> 1) ^ CRC_POLYNOM;
+            }
+            else
+            {
+                remainder >>= 1;
+            }
+            crcTable[dividend] = (ushort) remainder;
+        }
+    }
+}
+
+-(id) init
+{
+    if(self = [super init])
+    {
+        _init = [[NSNumber alloc]initWithInt:CRC_INITIAL];
+        _value = [[NSNumber alloc] initWithInt:CRC_INITIAL];
+    }
+    return self;
+}
+
+- (long)getValue
+{
+    return [_value unsignedShortValue] & 0xff;
+}
+
+- (void)reset
+{
+    _value = _init;
+}
+
+- (void)updateWithBuf:(Byte[])buf Off:(int)off Nbytes:(int)nbytes
+{
+    for (int i = 0; i < nbytes; i++)
+    {
+        int data = buf[off + i] ^ _value.intValue;
+        int value = crcTable[data & 0xff] ^ (_value.intValue << 8);
+        _value = [NSNumber numberWithInt:value];
+    }
+}
+
+- (void)updateWithBuf:(Byte [])buf Nbytes:(int)nbytes
+{
+    [self updateWithBuf:buf Off:0 Nbytes:nbytes];
+}
+
+
+- (void)updateWithValue:(int)value
+{
+    Byte b[1] = { (Byte)value };
+    [self updateWithBuf:b Nbytes:1];
+}
+
+@end