zuoyebang/tongxin/VC/WatchHome/DeviceInfo/Bluetooth/BluetoothTool.m

//
//  BluetoothTool.m
//  BluetoothDemo
//
//  Created by mac on 17/3/16.
//  Copyright © 2017年 . All rights reserved.
//

#import "BluetoothTool.h"
#import "BLEConst.h"
#import "Bluetooth.h"

@implementation BluetoothTool


/**
 CRC校验数据是否正确
 */
+ (BOOL)checkCRCWithData:(NSMutableData *)data { 
    // 取出CRC
//    int crc = [BluetoothTool intFromHexSrting:[NSString stringWithFormat:@"%02x%02x",((Byte*)([data bytes]))[4],((Byte*)([data bytes]))[5]]];
    Byte *bytes = (Byte *)[data bytes];
    // 利用位移管道运算转整数 modify by fangtao 2018.12.01
    int crc = (bytes[4] & 0xff) << 8 | (bytes[5] & 0xff);
    // L2层数据
    NSData *contentData = [data subdataWithRange:NSMakeRange(8, data.length - 8)];
    // 重新根据contentData计算CRC
    int dataCrc = 0xff;
    int contentLength = (int)contentData.length;
    Byte *contentBytes = (Byte *)[contentData bytes];
    for (int i = 0; i <contentLength ; i++) {
        dataCrc^= contentBytes[i] & 0xFF;
//        NSLog(@"dataCrc == ++ %d",dataCrc);
        for (int j = 0; j < 8; j++) {
            if((dataCrc & 1) !=0){
                dataCrc >>=1;
                dataCrc^=0xB8;
            }else{
                dataCrc>>=1;
            }
        }
    }
    // 如果相等则正确
    if (crc == dataCrc) {
        return YES;
    }
    return NO;
}

/**
 *  16进制字符串转10进制数字
 *
 *  @param hexString 16进制字符串
 *
 *  @return 十进制数据
 */
+ (int)intFromHexSrting:(NSString *)hexString {
    
    NSLog(@"%@",hexString);
    if (!hexString) {
        return 0;
    }
#warning 陈廷峰此处有几率闪退,出现请告知
    NSString * temp10 = [NSString stringWithFormat:@"%lu",strtoul([hexString UTF8String],0,16)];
    return [temp10 intValue];
}

/**
 10进制转16进制字符串
 
 @param hexNumber 10进制
 
 @return 十六进制字符串
 */
+ (NSString *)stringWithHexNumber:(int)hexNumber {
    // 固件升级情况下处理一个字节超过255的情况
    if (hexNumber > 255) {
        hexNumber = 0;
    }
    char hexChar[6];
    sprintf(hexChar, "%02x", (int)hexNumber);
    
    NSString *hexString = [NSString stringWithCString:hexChar encoding:NSUTF8StringEncoding];
    
    return hexString;
}



/**
 构造L1层第二个字节
 
 @param err    1:对的 0:错的
 @param ack    1:回复 0:命令
 @param vision 版本
 */
+ (Byte)stitchWithErr:(int)err Ack:(int)ack Vision:(int)vision {
    
    int a = 0 * pow(2, 7) + 0 * pow(2, 6) + err * pow(2, 5) + ack * pow(2, 4) + vision;
    
    return a;
}

/**
 倒序mac地址
 */
+ (NSString *)getInvertedOrderMacWithData:(NSData *)data {
    
    NSString *macTemp = data.description;
    
    NSMutableString *mutableMac = [[NSMutableString alloc]init];;
    if (macTemp) {
        
        macTemp = [macTemp stringByReplacingOccurrencesOfString:@" " withString:@""];
        macTemp = [macTemp stringByReplacingOccurrencesOfString:@"<" withString:@""];
        macTemp = [macTemp stringByReplacingOccurrencesOfString:@">" withString:@""];
        macTemp = [macTemp substringFromIndex:4];
        
        for (int i = 0; i<6; i++) {
            NSString *str = [macTemp substringWithRange:NSMakeRange(macTemp.length-2-i*2, 2)];
            if (i==5) {
                [mutableMac appendString:[NSString stringWithFormat:@"%@",str]];
                
            }
            else{
                [mutableMac appendString:[NSString stringWithFormat:@"%@:",str]];
            }
        }
    }
    
    return mutableMac;
}


/**
 正序mac地址
 */
+ (NSString *)getPositiveSequenceMacWithData:(NSData *)data {
    NSString *dataStr = [self hexStringFromData:data];
    NSMutableString *mutableMac = [[NSMutableString alloc]init];;
    if (dataStr) {
        dataStr = [dataStr stringByReplacingOccurrencesOfString:@" " withString:@""];
        dataStr = [dataStr stringByReplacingOccurrencesOfString:@"<" withString:@""];
        dataStr = [dataStr stringByReplacingOccurrencesOfString:@">" withString:@""];
        for (int i = 0; i < 6; i++) {
            NSString *str = [dataStr substringWithRange:NSMakeRange(i*2, 2)];
            if (i == 5) {
                [mutableMac appendString:[NSString stringWithFormat:@"%@",str]];
            }else {
                [mutableMac appendString:[NSString stringWithFormat:@"%@:",str]];
            }
        }
    }
    return [mutableMac uppercaseString];
}

/**
 Data转16进制字符串
 */
+ (NSString *)hexStringFromData:(NSData*)data {
    if (![data isKindOfClass:[NSData class]]) {
        return nil;
    }
    if (data == nil) {
        return nil;
    }
    NSMutableString *hexString = [NSMutableString string];
    const unsigned char *p = [data bytes];
    for (int i=0; i < [data length]; i++) {
        [hexString appendFormat:@"%02x", *p++];
    }
    return hexString;
}



@end