帮我写一个modbus rtu的接收报文代码
时间: 2023-03-24 11:02:52 浏览: 69
好的,以下是modbus rtu的接收报文代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_DATA_LEN 256
int main() {
unsigned char buffer[MAX_DATA_LEN];
int len = ;
// 接收数据
while (1) {
unsigned char c;
scanf("%c", &c);
buffer[len++] = c;
// 判断是否接收完整个报文
if (len >= 5 && len == buffer[2] + 5) {
break;
}
}
// 处理数据
unsigned short crc = xFFFF;
for (int i = ; i < len - 2; i++) {
crc ^= buffer[i];
for (int j = ; j < 8; j++) {
if (crc & x0001) {
crc = (crc >> 1) ^ xA001;
} else {
crc >>= 1;
}
}
}
// 判断校验和是否正确
unsigned short recv_crc = buffer[len - 2] << 8 | buffer[len - 1];
if (crc == recv_crc) {
printf("接收到的报文:");
for (int i = ; i < len; i++) {
printf("%02X ", buffer[i]);
}
printf("\n");
} else {
printf("校验和错误!\n");
}
return ;
}
```
希望能对你有所帮助!