串口命令解析

119 阅读 0 评论 79 点赞

我是靠谱客的博主高大乐曲，最近开发中收集的这篇文章主要介绍串口命令解析，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

1、背景

需求：通过串口输入命令来控制程序运行状态。

2、实现：

利用strtok函数解析字符串，再通过ctrcmp函数比较预设的字符串来区分命令。需要注意数组的越界和空字符。

3、例程：

#include <stdio.h>
#include <string.h>

#define CMD_HEAD    "SLR"
#define TOK_MAX_NUM (2+2)//SLR [cmd] [value1] [value2]
char *pCmdList[] = {"help", "freq"};

void cmdAnylize(char *str)
{
    char *tokS[TOK_MAX_NUM] = {NULL};
    char *s = strtok(str, " ");
    int value[TOK_MAX_NUM-2] = {0};
    char num = 0;
    char i = 0;
    // printf("%sn", s);
    tokS[num++] = s;
    while(NULL != (s = strtok(NULL, " ")))
    {
        // printf("%sn", s);
        if(TOK_MAX_NUM == num)
            break;
        tokS[num++] = s;
    }
    // for(i = 0; i< TOK_MAX_NUM,NULL!=tokS[i]; i++)
    // {
        // printf("%d:%sn", i, tokS[i]);
    // }
    
    if(1 >= num)
    {
        printf("input cmd is invalid, you can input: SLR helpn");
        return;
    }
    
    if(0 != strcmp(tokS[0], CMD_HEAD))
    {
        printf("input cmd is invalid, you can input: SLR helpn");
        return;
    }
    // help
    if(0 == strcmp(tokS[1], pCmdList[0]))
    {
        printf("*********************help info:*********************n");
        printf("1. SLR freq [value]    eg.SLR freq 20, ps.value:1~25n");
        printf("****************************************************n");
    }
    //freq
    else if(0 == strcmp(tokS[1], pCmdList[1]))
    {
        if(3 != num)
        {
            printf("input cmd is invalid, you can input: SLR helpn");
            return;
        }
        value[0] = atoi(tokS[2]);
        printf("%s:%dn", tokS[1], value[0]);
    }

}
int main(int argc, char *argv)
{
    char str1[] = "SLR help";
    cmdAnylize(str1);
    char str2[] = "SLR freq 25";
    cmdAnylize(str2);
    char str3[] = "SLR freq";
    cmdAnylize(str3);
    char str4[] = "sss";
    cmdAnylize(str4);
    char str5[] = "SLR ";
    cmdAnylize(str5);
    char str6[] = "SLR freq 11 0";
    cmdAnylize(str6);
}