封装一个用于payload传出的结构体，参考
typedef struct{ uint8_t header55; uint8_t headeraa; uint8_t cmd; uint8_t cs; uint8_t length; uint8_t payload[0]; } __attribute__ ((packed)) sPacketHeader_t;申请一段内存，结构体指针为其赋值，计算cs 将这个包模拟传输到另一个设备（函数代替），还原成结构体 计算这个结构体的cs，看和包内的cs是否一致
#include <stdio.h> #include <stdlib.h> #include <string.h> typedef unsigned char uint8_t; typedef unsigned int uint32_t; void data_transmission(void *buf); #define Get_Name 1 typedef struct{ uint8_t header55; uint8_t headeraa; uint8_t cmd; uint8_t cs; uint8_t length; uint8_t payload[0]; } __attribute__ ((packed)) sPacketHeader_t; uint8_t getCs(sPacketHeader_t *p){ uint8_t cs = 0; uint32_t i; for(i= 0; i< p->length; i++){ cs += p->payload[i]; } return cs; } int main(int argc,char *argv[]) { sPacketHeader_t *p; p = (sPacketHeader_t *)malloc(sizeof(sPacketHeader_t)+10); strcpy(p->payload,"abcde"); p->header55 = 0x55; p->headeraa = 0xaa; p->cmd = Get_Name; p->length = 5; p->cs = getCs(p); // p->cs = p->payload[0] +p->payload[1]+p->payload[2] +p->payload[3] +p->payload[4] +p->payload[5] +p->payload[6] +p->payload[7]; printf("%d\n",p->cs); data_transmission(p); return 0; } void data_transmission(void *buf) { //55 aa Get_Name 5 a b c d e uint8_t *ps = (uint8_t *)buf; sPacketHeader_t *p1 = ps; printf("header55 = 0x%x\n",p1->header55); printf("headeraa = 0x%x\n",p1->headeraa); printf("cmd = 0x%x\n",p1->cmd); printf("cs = 0x%x\n",p1->cs); printf("length = %d\n",p1->length); printf("%s\n",p1->payload); uint8_t cs = getCs(p1); // p_cs = ps[5] + ps[6] + ps[7] + ps[8] +ps[9] + ps[10] + ps[11] +ps[12]; printf("cs = 0x%x\n",cs); if(cs == p1->cs){ printf("cs一样\n"); } else{ printf("cs不一样\n"); } }