[技术文章]轻量级通讯协议源码(适用于单片机之间通讯) [复制链接]

/* 0d|DIT#>?  
应用场景之一：串口通讯 xQ0.2[*5  
*/ o)2KQ$b>Q  
int pack_encode(char *src, int src_len, char *dst, int *dst_len) EGMIw?%Y`-  
{ \8<ZPqt9  
    int i = 0; S.,5vI"s,  
    int j = 0; |L<p90  
_c$F?9:  
    if (!src || !dst || !dst_len) PP-U.  
        return -1; I<+i87=  
Q8Fqf ;4  
    dst[j++] = 0x7E; J`[v u4  
    for (i = 0; i < src_len; i++)
rNN,!  
    { f`vu+nw  
        if (src == 0x7E) n@te.,?A"  
        { T B(K&3_D  
            dst[j++] = 0x7D; 2 r';)8:  
            dst[j++] = 0x5E; oAprM Z7Y  
        } Y a/+|mv  
        else if (src == 0x7D) `k.0d`3(  
        { UFzC8  
            dst[j++] = 0x7D; /6{P ?)]pE  
            dst[j++] = 0x5D; 93VbB[w~7F  
        } <ebC]2j8cK  
        else ,CxIA^  
        { @#QaaR;4  
            dst[j++] = src; fNk0&M  
        } RRUv_sff  
    } "&%Lhyt  
    dst[j++] = 0x7E; wTe 9OFv  
    *dst_len = j; ty\F~]Oo  
    return 0; *!r"+?0gN  
} #ZyY(S1.  
nKnQ%R  
int pack_decode(char *src, int src_len, char *dst, int *dst_len) 5ktFL<^5T  
{ !O 0{ .k  
    int i = 0; J3QL%#  
    int j = 0; :|a$[g5  
N`J]k B7  
    if (!src || !dst || !dst_len || src[0] != 0x7E || src[src_len - 1] != 0x7E) mW=9WV  
        return -1; Tf40lv+{  
QAzwNXE+  
    src_len--; VOSq%hB  
    for (i = 1; i < src_len; i++) gvFs$X*^:  
    { 'm^]X3y*  
        if (src == 0x7D && (i + 1) < src_len) lBzfBmEB  
        { 0[ZB^  
            i++; #b9V&/ln  
            if (src == 0x5E) (Xl+Zi>\{  
            { {,B.OM)J  
                dst[j++] = 0x7E; B:96E&  
            } ~%
L=<TBAc  
            else if (src == 0x5D) ?*^HZ~O1  
            { *. 1S  
                dst[j++] = 0x7D; 2. q\!V}yQ  
            } QlMv_|`9  
            else _BoYyJQH  
            { i
?%_Pu  
                return -1; qVssw* GDB  
            } 0TaN#  
        } 3b?8<*  
        else ?vP6~$*B  
        { JAX`iQd  
            dst[j++] = src; Dkg^B@5Xr  
        } lhX4MB"  
    } E[Q2ZqhgbP  
    *dst_len = j; NG8F'=<  
    return 0; RiZ)#0  
} z.Vf,<H  
3 MCV?"0  
int main(int argc, char *argv[]) f#McTC3C  
{ I;9C":'#  
    int i = 0; twhT6wz"  
    int len = 0; y@(EGfI  
    char buff[128] = {0x7F}; >Cam6LJ  
    char temp[128] = {0}; y&V%xE/  
    char result[128] = {0}; mNlbiB  
pVM1%n:#  
    pack_encode(buff, 1, temp, &len); :F_>`{  
    printf("encode reault:len=%d,", len); ZnBGNr  
    for (i = 0; i < len; i++) i|rCGa0}  
        printf("%02x ", temp); V4&a+MJ@  
    printf("\n"); `>GXJ~:D["  
@~}~;}0x  
    pack_decode(temp, len, result, &len); >abpse  
    printf("decode reault:len=%d,", len); .X5A7 m  
    for (i = 0; i < len; i++) LLL;SNY  
        printf("%02x ", result); D&x
.io  
    printf("\n"); M8IU[Pz4  
a ?\:,5=  
    if (memcmp(result, buff, len) != 0) x*p'm[Tdtm  
    { b2H-D!YO^  
        printf("fuck！test failed\n"); >)HKruSW.  
    } MEu{'[C  
    else :`>tCYy;  
    { FNs$k=*8  
        printf("yes!, test ok\n"); "
ZL_  
    } G#~U\QlG-  
k;K-6<^h  
    return 0; Jpc%i8  
} ?Yx2q_KZk  
6E2#VT>@/  
/* `(/xj{"Fr}  
打包，解包、测试都在上面了，拿去用吧，不用感谢。 ;U3K@_  
*/

[ 此帖被ajtdnta在2020-08-14 17:05重新编辑 ]

  

相关用了挺多,因为PC和STC15W通讯,就几个指令,所以电脑端发送单字节 A，B，C。。。。，然后单片机端接收到用switch判断做相应干活.

学习一下看看

int pack_decode(char *src, int src_len, char *dst, int *dst_len) RJ$x{$r[  
这句那位大佬解释下，这个函数开头的int和括号里面的int分别是，返回值类型，和变量类型吗

这个不好用