文章目录
- 网络协议深入了解
- 一、练习wireshark抓取网络数据包
- 二、数据发送抓包
- C编程完成modbus协议，从云端服务器读取温湿度数据
- 一、c语言完成modbus协议从云端服务器读取信息
- 二、运行结果
- 用stm32最小核心板+AHT20模块，完成一个 modbus接口的温湿度Slave设备，能够让上位机PC通过modbus协议获取温湿度。主程序采用多任务框架，比如RT-thread Nano。
- 一、STM32移植RT_THread
- 二、Keil代码编写
网络协议深入了解
一、练习wireshark抓取网络数据包
1.测试聊天功能
测试成功
2.使用wireshark抓取网络数据
通过Wireshark抓包，可以验证该程序运行时通过UDP协议进行发送，并发送到广播地址255.255.255.255，保证同房间处于任意端口号的可以接受到信息，端口号则是5000+房间号。
二、数据发送抓包
1.抓取西文字符
以我发送的259429为例
根据抓包可知：该端口号是5001，房间号是1234发送的数据是259429转化了Ascll码，可以在传输数据中显示并查询到；在下面那一栏我们可以很明显打看到一个数字对应一个字节，并且可以直接看到抓包数据
2.抓取汉字字符
虚拟机发送的是真理
Port显示同西文字符相同，处于1234聊天室因此port为6234，在发送阶段略有不同 真理为2汉字，占8字节，一个汉字为4字节，在此阶段，中文字符被隐藏，不能正常显示使用字符转换工具 16进制->utf-8查看汉字字符集
3.抓取混合字符
其余信息不变，数据部分西文字符可直接观察，中文需要编译转换
UDP协议是一种无连接的协议，并不需要在两台计算机之间建立固定连接，近程即时通讯，脱离了远程的服务器，避免了和远程服务器连接时造成网络浪费，也避免了服务器忙或服务器无法连接的状况。
C编程完成modbus协议，从云端服务器读取温湿度数据
一、c语言完成modbus协议从云端服务器读取信息
1.TCP方式请求数据
新建一个tcp客户端项目
更改代码
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <winsock2.h>
#include <math.h>
#include "stdint.h"
#define length_8 8 //定义一个宏，为传入8位16进制数的个数
#define PORT 8002
#define SERVER_IP "123.56.90.74"
#define BUFFER_SIZE 4196
const char* kExitFlag = "exit";
/* 返回ch字符在sign数组中的序号 */
int getIndexOfSigns(char ch)
{
if(ch >= '0' && ch <= '9')
{
return ch - '0';
}
if(ch >= 'A' && ch <='F')
{
return ch - 'A' + 10;
}
if(ch >= 'a' && ch <= 'f')
{
return ch - 'a' + 10;
}
return -1;
}
/* 十六进制数转换为十进制数 */
int hexToDec(char *source)
{
int sum = 0;
int t = 1;
int i, len=4;
char low,high;
for(int i=0,j=7;i<4;i++){
//TODO
high = (source[i] & 0xf0)>>4;
low = source[i] & 0x0f;
sum += high*pow(16,j--)+low*pow(16,j--);
}
return sum;
}
const unsigned char *fromhex(const char *str)
{
static unsigned char buf[512];
size_t len = strlen(str) / 2;
if (len > 512) len = 512;
for (size_t i = 0; i < len; i++) {
unsigned char c = 0;
if (str[i * 2] >= '0' && str[i*2] <= '9')
c += (str[i * 2] - '0') << 4;
if ((str[i * 2] & ~0x20) >= 'A' && (str[i*2] & ~0x20) <= 'F')
c += (10 + (str[i * 2] & ~0x20) - 'A') << 4;
if (str[i * 2 + 1] >= '0' && str[i * 2 + 1] <= '9')
c += (str[i * 2 + 1] - '0');
if ((str[i * 2 + 1] & ~0x20) >= 'A' && (str[i * 2 + 1] & ~0x20) <= 'F')
c += (10 + (str[i * 2 + 1] & ~0x20) - 'A');
buf[i] = c;
}
return buf;
}
uint16_t CRC_16(uint8_t *temp)
{
uint8_t i,j;
uint16_t CRC_1 = 0xFFFF; //声明CRC寄存区，也就是步骤1
for(i = 0;i < 6;i++) //这里的for循环说的是步骤6中的重复步骤 2 到步骤 5
{
CRC_1 ^= temp[i]; //这里就是步骤2，进行异或运算
for(j = 0;j < 8;j++) //用来将异或后的低八位全部移出的for循环
{
if(CRC_1 & 0x01) //判断低八位的最后一位是否为1，为1时执行下列语句，也就是步骤3说的移位判断与步骤5说的右移8次
{
/*一定要先移位，再异或*/
CRC_1 >>=1; //移位后再异或，就是步骤4
CRC_1 ^= 0xA001; //0xA001为0x8005的逆序
}
else //若不为1，则直接移位。
{
CRC_1 >>=1;
}
}
}
// CRC_1 = (((CRC_1 & 0xFF)<<8) + (CRC_1>>8));
// printf("%04x\r\n",CRC_1); //用于打印检测CRC校验码
return(CRC_1);
}
int main() {
// 初始化socket dll。
WORD winsock_version = MAKEWORD(2,2);
WSADATA wsa_data;
if (WSAStartup(winsock_version, &wsa_data) != 0) {
printf("Failed to init socket!\n");
return 1;
}
SOCKET client_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (client_socket == INVALID_SOCKET) {
printf("Failed to create server socket!\n");
return 2;
}
struct sockaddr_in server_addr;
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(PORT);
server_addr.sin_addr.S_un.S_addr = inet_addr(SERVER_IP);
if (connect(client_socket, (LPSOCKADDR)&server_addr, sizeof(server_addr)) == SOCKET_ERROR) {
printf("Failed to connect server: %ld !\n", GetLastError());
return 3;
}
char recv_data[BUFFER_SIZE+1];
while (true) {
uint8_t data[length_8];
printf("具体指令给格式为0+传感器编号（1，2，3，4，5）0300010002");
printf("请输入采集传感器的指令）：\r\n");
scanf("%s",data);
uint16_t crc;
unsigned char * cmd;
char crc1[8];
cmd = fromhex(data);
crc = CRC_16(cmd);
uint8_t a = 0xFF;
for(int i=0;i<6;i++){
//TODO
crc1[i] = cmd[i];
}
crc1[6] = a & crc;
crc1[7] = (crc >> 8) & a;
if (send(client_socket, crc1, 8, 0) < 0) {
printf("Failed to send data!\n");
break;
}
int ret = recv(client_socket, recv_data, BUFFER_SIZE, 0);
if (ret < 0) {
printf("Failed to receive data!\n");
break;
}
recv_data[ret]=0; // correctly ends received string
char yb[4],wd[4];
for(int i=0;i<4;i++){
//TODO
yb[i] = recv_data[4+i];
wd[i] = recv_data[8+i];
}
float mic = hexToDec(yb)/100.0;
float strain_temp = hexToDec(wd)/100.0;
printf("应变：%f\r\n",mic);
printf("温度：%f\r\n",strain_temp);
// printf("Receive data from server: \"%x\"\n",recv_data);
if (strcmp(data,kExitFlag)==0) {
printf("Exit!\n");
break;
}
}
closesocket(client_socket);
WSACleanup();
return 0;
}
其中服务器的地址为123.56.90.74
二、运行结果
用stm32最小核心板+AHT20模块，完成一个 modbus接口的温湿度Slave设备，能够让上位机PC通过modbus协议获取温湿度。主程序采用多任务框架，比如RT-thread Nano。
一、STM32移植RT_THread
1.CubeMX安装Nano pack
先获取软件包地址：https://www.rt-thread.org/download/cube/RealThread.RT-Thread.pdsc
打开 CubeMX，从菜单栏 help 进入 Manage embedded software packages 界面，点击 From Url 按钮，进入 User Defined Packs Manager 界面，其次点击 new，填入上述网址，然后点击 check
2.keil MDK安装RT_THread
CubeMX新建文件
选择 Nano 组件
（1）点击 Softwares Packages->Select Components，进入组件配置界面，选择 RealThread， 然后根3.1.5版本的，然后点击 OK 按钮
这时会新增Software Packs展开就可以看见添加的RealThread.RT_Thread,勾选相应内容
RCC配置
SYS配置
设置NVIC
USART1配置
GPIO选择b15串口，用来点亮LED灯
设置TIM3
时钟树配置
生成项目
二、Keil代码编写
1.添加AHT文件
将AHT添加到项目中
修改AHT20-21_DEMO_V1_3.c
/*******************************************/
/*@????:?????????? */
/*@??:????????? */
/*@??:V1.2 */
/*******************************************/
//#include "main.h"
#include "AHT20.h"
#include "gpio.h"
#include "i2c.h"
void Delay_N10us(uint32_t t)//????
{
uint32_t k;
while(t--)
{
for (k = 0; k < 2; k++);//110
}
}
void SensorDelay_us(uint32_t t)//????
{
for(t = t-2; t>0; t--)
{
Delay_N10us(1);
}
}
void Delay_4us(void) //????
{
Delay_N10us(1);
Delay_N10us(1);
Delay_N10us(1);
Delay_N10us(1);
}
void Delay_5us(void) //????
{
Delay_N10us(1);
Delay_N10us(1);
Delay_N10us(1);
Delay_N10us(1);
Delay_N10us(1);
}
void Delay_1ms(uint32_t t) //????
{
while(t--)
{
SensorDelay_us(1000);//??1ms
}
}
//void AHT20_Clock_Init(void) //????
//{
// RCC_APB2PeriphClockCmd(CC_APB2Periph_GPIOB,ENABLE);
//}
void SDA_Pin_Output_High(void) //?PB7????? , ???????, PB7??I2C?SDA
{
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;//????
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOB,& GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_7,GPIO_PIN_SET);
}
void SDA_Pin_Output_Low(void) //?P7????? ???????
{
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;//????
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOB,& GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_7,GPIO_PIN_RESET);
}
void SDA_Pin_IN_FLOATING(void) //SDA???????
{
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;//??
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init( GPIOB,&GPIO_InitStruct);
}
void SCL_Pin_Output_High(void) //SCL?????,P14??I2C?SCL
{
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_6,GPIO_PIN_SET);
}
void SCL_Pin_Output_Low(void) //SCL?????
{
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_6,GPIO_PIN_RESET);
}
void Init_I2C_Sensor_Port(void) //???I2C??,??????
{
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;//????
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOB,& GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_15,GPIO_PIN_SET);
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;//????
GPIO_InitStruct.Pin = GPIO_PIN_6;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOB,& GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_15,GPIO_PIN_SET);
}
void I2C_Start(void) //I2C????START??
{
SDA_Pin_Output_High();
SensorDelay_us(8);
SCL_Pin_Output_High();
SensorDelay_us(8);
SDA_Pin_Output_Low();
SensorDelay_us(8);
SCL_Pin_Output_Low();
SensorDelay_us(8);
}
void AHT20_WR_Byte(uint8_t Byte) //?AHT20?????
{
uint8_t Data,N,i;
Data=Byte;
i = 0x80;
for(N=0;N<8;N++)
{
SCL_Pin_Output_Low();
Delay_4us();
if(i&Data)
{
SDA_Pin_Output_High();
}
else
{
SDA_Pin_Output_Low();
}
SCL_Pin_Output_High();
Delay_4us();
Data <<= 1;
}
SCL_Pin_Output_Low();
SensorDelay_us(8);
SDA_Pin_IN_FLOATING();
SensorDelay_us(8);
}
uint8_t AHT20_RD_Byte(void)//?AHT20??????
{
uint8_t Byte,i,a;
Byte = 0;
SCL_Pin_Output_Low();
SDA_Pin_IN_FLOATING();
SensorDelay_us(8);
for(i=0;i<8;i++)
{
SCL_Pin_Output_High();
Delay_5us();
a=0;
//if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_15)) a=1;
if(HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_7)) a=1;
Byte = (Byte<<1)|a;
//SCL_Pin_Output_Low();
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_6,GPIO_PIN_RESET);
Delay_5us();
}
SDA_Pin_IN_FLOATING();
SensorDelay_us(8);
return Byte;
}
uint8_t Receive_ACK(void) //?AHT20?????ACK
{
uint16_t CNT;
CNT = 0;
SCL_Pin_Output_Low();
SDA_Pin_IN_FLOATING();
SensorDelay_us(8);
SCL_Pin_Output_High();
SensorDelay_us(8);
while((HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_7)) && CNT < 100)
CNT++;
if(CNT == 100)
{
return 0;
}
SCL_Pin_Output_Low();
SensorDelay_us(8);
return 1;
}
void Send_ACK(void) //????ACK??
{
SCL_Pin_Output_Low();
SensorDelay_us(8);
SDA_Pin_Output_Low();
SensorDelay_us(8);
SCL_Pin_Output_High();
SensorDelay_us(8);
SCL_Pin_Output_Low();
SensorDelay_us(8);
SDA_Pin_IN_FLOATING();
SensorDelay_us(8);
}
void Send_NOT_ACK(void) //?????ACK
{
SCL_Pin_Output_Low();
SensorDelay_us(8);
SDA_Pin_Output_High();
SensorDelay_us(8);
SCL_Pin_Output_High();
SensorDelay_us(8);
SCL_Pin_Output_Low();
SensorDelay_us(8);
SDA_Pin_Output_Low();
SensorDelay_us(8);
}
void Stop_I2C(void) //??????
{
SDA_Pin_Output_Low();
SensorDelay_us(8);
SCL_Pin_Output_High();
SensorDelay_us(8);
SDA_Pin_Output_High();
SensorDelay_us(8);
}
uint8_t AHT20_Read_Status(void)//??AHT20??????
{
uint8_t Byte_first;
I2C_Start();
AHT20_WR_Byte(0x71);
Receive_ACK();
Byte_first = AHT20_RD_Byte();
Send_NOT_ACK();
Stop_I2C();
return Byte_first;
}
uint8_t AHT20_Read_Cal_Enable(void) //??cal enable??????
{
uint8_t val = 0;//ret = 0,
val = AHT20_Read_Status();
if((val & 0x68)==0x08)
return 1;
else return 0;
}
void AHT20_SendAC(void) //?AHT20??AC??
{
I2C_Start();
AHT20_WR_Byte(0x70);
Receive_ACK();
AHT20_WR_Byte(0xac);//0xAC????
Receive_ACK();
AHT20_WR_Byte(0x33);
Receive_ACK();
AHT20_WR_Byte(0x00);
Receive_ACK();
Stop_I2C();
}
//CRC????:CRC8/MAXIM
//???:X8+X5+X4+1
//Poly:0011 0001 0x31
//????????? 1000 1100 0x8c
//C????:
uint8_t Calc_CRC8(uint8_t *message,uint8_t Num)
{
uint8_t i;
uint8_t byte;
uint8_t crc=0xFF;
for(byte=0; byte<Num; byte++)
{
crc^=(message[byte]);
for(i=8;i>0;--i)
{
if(crc&0x80) crc=(crc<<1)^0x31;
else crc=(crc<<1);
}
}
return crc;
}
void AHT20_Read_CTdata(uint32_t *ct) //??CRC??,????AHT20????????
{
volatile uint8_t Byte_1th=0;
volatile uint8_t Byte_2th=0;
volatile uint8_t Byte_3th=0;
volatile uint8_t Byte_4th=0;
volatile uint8_t Byte_5th=0;
volatile uint8_t Byte_6th=0;
uint32_t RetuData = 0;
uint16_t cnt = 0;
AHT20_SendAC();//?AHT10??AC??
Delay_1ms(80);//??80ms??
cnt = 0;
while(((AHT20_Read_Status()&0x80)==0x80))//????bit[7]?0,???????,??1,?????
{
SensorDelay_us(1508);
if(cnt++>=100)
{
break;
}
}
I2C_Start();
AHT20_WR_Byte(0x71);
Receive_ACK();
Byte_1th = AHT20_RD_Byte();//???,??????0x98,??????,bit[7]?1;???0x1C,??0x0C,??0x08???????,bit[7]?0
Send_ACK();
Byte_2th = AHT20_RD_Byte();//??
Send_ACK();
Byte_3th = AHT20_RD_Byte();//??
Send_ACK();
Byte_4th = AHT20_RD_Byte();//??/??
Send_ACK();
Byte_5th = AHT20_RD_Byte();//??
Send_ACK();
Byte_6th = AHT20_RD_Byte();//??
Send_NOT_ACK();
Stop_I2C();
RetuData = (RetuData|Byte_2th)<<8;
RetuData = (RetuData|Byte_3th)<<8;
RetuData = (RetuData|Byte_4th);
RetuData =RetuData >>4;
ct[0] = RetuData;//??
RetuData = 0;
RetuData = (RetuData|Byte_4th)<<8;
RetuData = (RetuData|Byte_5th)<<8;
RetuData = (RetuData|Byte_6th);
RetuData = RetuData&0xfffff;
ct[1] =RetuData; //??
}
void AHT20_Read_CTdata_crc(uint32_t *ct) //CRC???,??AHT20????????
{
volatile uint8_t Byte_1th=0;
volatile uint8_t Byte_2th=0;
volatile uint8_t Byte_3th=0;
volatile uint8_t Byte_4th=0;
volatile uint8_t Byte_5th=0;
volatile uint8_t Byte_6th=0;
volatile uint8_t Byte_7th=0;
uint32_t RetuData = 0;
uint16_t cnt = 0;
// uint8_t CRCDATA=0;
uint8_t CTDATA[6]={0};//??CRC????
AHT20_SendAC();//?AHT10??AC??
Delay_1ms(80);//??80ms??
cnt = 0;
while(((AHT20_Read_Status()&0x80)==0x80))//????bit[7]?0,???????,??1,?????
{
SensorDelay_us(1508);
if(cnt++>=100)
{
break;
}
}
I2C_Start();
AHT20_WR_Byte(0x71);
Receive_ACK();
CTDATA[0]=Byte_1th = AHT20_RD_Byte();//???,??????0x98,??????,bit[7]?1;???0x1C,??0x0C,??0x08???????,bit[7]?0
Send_ACK();
CTDATA[1]=Byte_2th = AHT20_RD_Byte();//??
Send_ACK();
CTDATA[2]=Byte_3th = AHT20_RD_Byte();//??
Send_ACK();
CTDATA[3]=Byte_4th = AHT20_RD_Byte();//??/??
Send_ACK();
CTDATA[4]=Byte_5th = AHT20_RD_Byte();//??
Send_ACK();
CTDATA[5]=Byte_6th = AHT20_RD_Byte();//??
Send_ACK();
Byte_7th = AHT20_RD_Byte();//CRC??
Send_NOT_ACK(); //??: ?????NAK
Stop_I2C();
if(Calc_CRC8(CTDATA,6)==Byte_7th)
{
RetuData = (RetuData|Byte_2th)<<8;
RetuData = (RetuData|Byte_3th)<<8;
RetuData = (RetuData|Byte_4th);
RetuData =RetuData >>4;
ct[0] = RetuData;//??
RetuData = 0;
RetuData = (RetuData|Byte_4th)<<8;
RetuData = (RetuData|Byte_5th)<<8;
RetuData = (RetuData|Byte_6th);
RetuData = RetuData&0xfffff;
ct[1] =RetuData; //??
}
else
{
ct[0]=0x00;
ct[1]=0x00;//???????,????????????
}//CRC??
}
void AHT20_Init(void) //???AHT20
{
Init_I2C_Sensor_Port();
I2C_Start();
AHT20_WR_Byte(0x70);
Receive_ACK();
AHT20_WR_Byte(0xa8);//0xA8??NOR????
Receive_ACK();
AHT20_WR_Byte(0x00);
Receive_ACK();
AHT20_WR_Byte(0x00);
Receive_ACK();
Stop_I2C();
Delay_1ms(10);//??10ms??
I2C_Start();
AHT20_WR_Byte(0x70);
Receive_ACK();
AHT20_WR_Byte(0xbe);//0xBE?????,AHT20???????0xBE, AHT10???????0xE1
Receive_ACK();
AHT20_WR_Byte(0x08);//?????bit[3]?1,?????
Receive_ACK();
AHT20_WR_Byte(0x00);
Receive_ACK();
Stop_I2C();
Delay_1ms(10);//??10ms??
}
void JH_Reset_REG(uint8_t addr)
{
uint8_t Byte_first,Byte_second,Byte_third;
I2C_Start();
AHT20_WR_Byte(0x70);//???0x70
Receive_ACK();
AHT20_WR_Byte(addr);
Receive_ACK();
AHT20_WR_Byte(0x00);
Receive_ACK();
AHT20_WR_Byte(0x00);
Receive_ACK();
Stop_I2C();
Delay_1ms(5);//??5ms??
I2C_Start();
AHT20_WR_Byte(0x71);//
Receive_ACK();
Byte_first = AHT20_RD_Byte();
Send_ACK();
Byte_second = AHT20_RD_Byte();
Send_ACK();
Byte_third = AHT20_RD_Byte();
Send_NOT_ACK();
Stop_I2C();
Delay_1ms(10);//??10ms??
I2C_Start();
AHT20_WR_Byte(0x70);///
Receive_ACK();
AHT20_WR_Byte(0xB0|addr);//?????
Receive_ACK();
AHT20_WR_Byte(Byte_second);
Receive_ACK();
AHT20_WR_Byte(Byte_third);
Receive_ACK();
Stop_I2C();
Byte_second=0x00;
Byte_third =0x00;
}
void AHT20_Start_Init(void)
{
JH_Reset_REG(0x1b);
JH_Reset_REG(0x1c);
JH_Reset_REG(0x1e);
}修改AHT20-21_DEMO_V1_3.h
#ifndef _AHT20_DEMO_
#define _AHT20_DEMO_
#include "main.h"
void Delay_N10us(uint32_t t);//????
void SensorDelay_us(uint32_t t);//????
void Delay_4us(void); //????
void Delay_5us(void); //????
void Delay_1ms(uint32_t t);
void AHT20_Clock_Init(void); //????
void SDA_Pin_Output_High(void) ; //?PB15????? , ???????, PB15??I2C?SDA
void SDA_Pin_Output_Low(void); //?P15????? ???????
void SDA_Pin_IN_FLOATING(void); //SDA???????
void SCL_Pin_Output_High(void); //SCL?????,P14??I2C?SCL
void SCL_Pin_Output_Low(void); //SCL?????
void Init_I2C_Sensor_Port(void); //???I2C??,??????
void I2C_Start(void); //I2C????START??
void AHT20_WR_Byte(uint8_t Byte); //?AHT20?????
uint8_t AHT20_RD_Byte(void);//?AHT20??????
uint8_t Receive_ACK(void); //?AHT20?????ACK
void Send_ACK(void) ; //????ACK??
void Send_NOT_ACK(void); //?????ACK
void Stop_I2C(void); //??????
uint8_t AHT20_Read_Status(void);//??AHT20??????
uint8_t AHT20_Read_Cal_Enable(void); //??cal enable??????
void AHT20_SendAC(void); //?AHT20??AC??
uint8_t Calc_CRC8(uint8_t *message,uint8_t Num);
void AHT20_Read_CTdata(uint32_t *ct); //??CRC??,????AHT20????????
void AHT20_Read_CTdata_crc(uint32_t *ct); //CRC???,??AHT20????????
void AHT20_Init(void); //???AHT20
void JH_Reset_REG(uint8_t addr);///?????
void AHT20_Start_Init(void);///?????????????
#endif2.移植freeModebusRTU
下载链接：https://github.com/cwalter-at/freemodbus
解压并打开刚刚下载的文件，点进demo里，新建一个STM32MB文件夹将BARE文件夹里的文件全部复制到刚刚建立的STM32MB文件夹里再把modbus文件夹全部复制到刚刚新建的STM32MB文件夹
打开项目里的MDK-ARM文件，将开始新建的STM32MB文件复制到这里
3.添加至项目
新建名为MB和MB_Port的组，MB内添加STM32MB文件夹下modbus文件夹内所有文件，MB_Port内添加STM32MB文件夹下port文件夹内所有.c文件以及根目录的demo.c文件：
4.修改代码
在Application/USER文件夹下新建app_rt_thread.c文件，并添加以下代码：
#include "rtthread.h"
#include "main.h"
#include "stdio.h"
#include "usart.h"
#include "AHT20-21_DEMO_V1_3.h"
#include "mb.h"
#include "mbport.h"
struct rt_thread led1_thread;
rt_uint8_t rt_led1_thread_stack[128];
void led1_task_entry(void *parameter);
//初始化线程函数
void MX_RT_Thread_Init(void)
{
//初始化LED1线程
rt_thread_init(&led1_thread,"led1",led1_task_entry,RT_NULL,&rt_led1_thread_stack[0],sizeof(rt_led1_thread_stack),3,20);
//开启线程调度
rt_thread_startup(&led1_thread);
}
//主任务
void MX_RT_Thread_Process(void)
{
( void )eMBPoll( );//启动modbus侦听
}
//LED1任务
void led1_task_entry(void *parameter)
{
while(1)
{
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_15, GPIO_PIN_RESET);
rt_thread_delay(500);
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_15, GPIO_PIN_SET);
rt_thread_delay(500);
}
}修改Middlewares/RT-Thread/RTOS/kernel文件夹下的board.c文件，将串口USART2改为为USART1：
修改main.c文件
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2022 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "dma.h"
#include "i2c.h"
#include "tim.h"
#include "usart.h"
#include "gpio.h"
#include "mb.h"
#include "mbport.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdio.h>
#include "AHT20-21_DEMO_V1_3.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
extern void MX_RT_Thread_Init(void);
extern void MX_RT_Thread_Process(void);
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_I2C1_Init();
MX_USART1_UART_Init();
MX_TIM3_Init();
AHT20_Init();
eMBInit( MB_RTU, 0x01, 1, 115200, MB_PAR_NONE);//初始化modbus，走modbusRTU，从站地址为0x01，端口为1。
eMBEnable( );//使能modbus
/* USER CODE BEGIN 2 */
MX_RT_Thread_Init();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
( void )eMBPoll( );//启动modbus侦听
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */修改 portserial.c文件：
/*
* FreeModbus Libary: BARE Port
* Copyright (C) 2006 Christian Walter <wolti@sil.at>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* File: $Id$
*/
#include "port.h"
/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
#include "usart.h"
/* ----------------------- static functions ---------------------------------*/
void prvvUARTTxReadyISR( void );
void prvvUARTRxISR( void );
/* ----------------------- Start implementation -----------------------------*/
void
vMBPortSerialEnable( BOOL xRxEnable, BOOL xTxEnable )
{
/* If xRXEnable enable serial receive interrupts. If xTxENable enable
* transmitter empty interrupts.
*/
if (xRxEnable) //将串口收发中断和modbus联系起来，下面的串口改为自己使能的串口
{
__HAL_UART_ENABLE_IT(&huart1,UART_IT_RXNE); //我用的是串口1，故为&huart1
}
else
{
__HAL_UART_DISABLE_IT(&huart1,UART_IT_RXNE);
}
if (xTxEnable)
{
__HAL_UART_ENABLE_IT(&huart1,UART_IT_TXE);
}
else
{
__HAL_UART_DISABLE_IT(&huart1,UART_IT_TXE);
}
}
BOOL
xMBPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity )
{
return TRUE;
}
BOOL
xMBPortSerialPutByte( CHAR ucByte )
{
/* Put a byte in the UARTs transmit buffer. This function is called
* by the protocol stack if pxMBFrameCBTransmitterEmpty( ) has been
* called. */
if(HAL_UART_Transmit (&huart1 ,(uint8_t *)&ucByte,1,0x01) != HAL_OK ) //添加发送一位代码
return FALSE ;
else
return TRUE;
}
BOOL
xMBPortSerialGetByte( CHAR * pucByte )
{
/* Return the byte in the UARTs receive buffer. This function is called
* by the protocol stack after pxMBFrameCBByteReceived( ) has been called.
*/
if(HAL_UART_Receive (&huart1 ,(uint8_t *)pucByte,1,0x01) != HAL_OK )//添加接收一位代码
return FALSE ;
else
return TRUE;
}
/* Create an interrupt handler for the transmit buffer empty interrupt
* (or an equivalent) for your target processor. This function should then
* call pxMBFrameCBTransmitterEmpty( ) which tells the protocol stack that
* a new character can be sent. The protocol stack will then call
* xMBPortSerialPutByte( ) to send the character.
*/
void prvvUARTTxReadyISR( void )
{
pxMBFrameCBTransmitterEmpty( );
}
/* Create an interrupt handler for the receive interrupt for your target
* processor. This function should then call pxMBFrameCBByteReceived( ). The
* protocol stack will then call xMBPortSerialGetByte( ) to retrieve the
* character.
*/
void prvvUARTRxISR( void )
{
pxMBFrameCBByteReceived( );
}修改porttimer.c文件：
/*
* FreeModbus Libary: BARE Port
* Copyright (C) 2006 Christian Walter <wolti@sil.at>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* File: $Id$
*/
/* ----------------------- Platform includes --------------------------------*/
#include "port.h"
#include "stm32f1xx_hal.h"
#include "tim.h"
/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
/* ----------------------- static functions ---------------------------------*/
void prvvTIMERExpiredISR( void );
/* ----------------------- Start implementation -----------------------------*/
BOOL
xMBPortTimersInit( USHORT usTim1Timerout50us )//定时器初始化直接返回TRUE，已经在mian函数初始化过
{
return TRUE;
}
inline void
vMBPortTimersEnable( )//使能定时器中断，我用的是定时器4，所以为&htim4
{
/* Enable the timer with the timeout passed to xMBPortTimersInit( ) */
/* Enable the timer with the timeout passed to xMBPortTimersInit( ) */
__HAL_TIM_CLEAR_IT(&htim3,TIM_IT_UPDATE);
__HAL_TIM_ENABLE_IT(&htim3,TIM_IT_UPDATE);
__HAL_TIM_SET_COUNTER(&htim3,0);
__HAL_TIM_ENABLE(&htim3);
}
inline void
vMBPortTimersDisable( )//取消定时器中断
{
/* Disable any pending timers. */
__HAL_TIM_DISABLE(&htim3);
__HAL_TIM_SET_COUNTER(&htim3,0);
__HAL_TIM_DISABLE_IT(&htim3,TIM_IT_UPDATE);
__HAL_TIM_CLEAR_IT(&htim3,TIM_IT_UPDATE);
}
/* Create an ISR which is called whenever the timer has expired. This function
* must then call pxMBPortCBTimerExpired( ) to notify the protocol stack that
* the timer has expired.
*/
void prvvTIMERExpiredISR( void )//modbus定时器动作，需要在中断内使用
{
( void )pxMBPortCBTimerExpired( );
}修改port.h文件：
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file stm32f1xx_it.c
* @brief Interrupt Service Routines.
******************************************************************************
* @attention
*
* Copyright (c) 2022 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32f1xx_it.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN TD */
/* USER CODE END TD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
/* USER CODE BEGIN PFP */
extern void prvvUARTTxReadyISR(void);
extern void prvvUARTRxISR(void);
extern void prvvTIMERExpiredISR( void );
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/* External variables --------------------------------------------------------*/
extern DMA_HandleTypeDef hdma_i2c1_rx;
extern DMA_HandleTypeDef hdma_i2c1_tx;
extern I2C_HandleTypeDef hi2c1;
extern TIM_HandleTypeDef htim3;
extern UART_HandleTypeDef huart1;
/* USER CODE BEGIN EV */
/* USER CODE END EV */
/******************************************************************************/
/* Cortex-M3 Processor Interruption and Exception Handlers */
/******************************************************************************/
/**
* @brief This function handles Non maskable interrupt.
*/
void NMI_Handler(void)
{
/* USER CODE BEGIN NonMaskableInt_IRQn 0 */
/* USER CODE END NonMaskableInt_IRQn 0 */
/* USER CODE BEGIN NonMaskableInt_IRQn 1 */
while (1)
{
}
/* USER CODE END NonMaskableInt_IRQn 1 */
}
/**
* @brief This function handles Memory management fault.
*/
void MemManage_Handler(void)
{
/* USER CODE BEGIN MemoryManagement_IRQn 0 */
/* USER CODE END MemoryManagement_IRQn 0 */
while (1)
{
/* USER CODE BEGIN W1_MemoryManagement_IRQn 0 */
/* USER CODE END W1_MemoryManagement_IRQn 0 */
}
}
/**
* @brief This function handles Prefetch fault, memory access fault.
*/
void BusFault_Handler(void)
{
/* USER CODE BEGIN BusFault_IRQn 0 */
/* USER CODE END BusFault_IRQn 0 */
while (1)
{
/* USER CODE BEGIN W1_BusFault_IRQn 0 */
/* USER CODE END W1_BusFault_IRQn 0 */
}
}
/**
* @brief This function handles Undefined instruction or illegal state.
*/
void UsageFault_Handler(void)
{
/* USER CODE BEGIN UsageFault_IRQn 0 */
/* USER CODE END UsageFault_IRQn 0 */
while (1)
{
/* USER CODE BEGIN W1_UsageFault_IRQn 0 */
/* USER CODE END W1_UsageFault_IRQn 0 */
}
}
/**
* @brief This function handles Debug monitor.
*/
void DebugMon_Handler(void)
{
/* USER CODE BEGIN DebugMonitor_IRQn 0 */
/* USER CODE END DebugMonitor_IRQn 0 */
/* USER CODE BEGIN DebugMonitor_IRQn 1 */
/* USER CODE END DebugMonitor_IRQn 1 */
}
/******************************************************************************/
/* STM32F1xx Peripheral Interrupt Handlers */
/* Add here the Interrupt Handlers for the used peripherals. */
/* For the available peripheral interrupt handler names, */
/* please refer to the startup file (startup_stm32f1xx.s). */
/******************************************************************************/
/**
* @brief This function handles DMA1 channel6 global interrupt.
*/
void DMA1_Channel6_IRQHandler(void)
{
/* USER CODE BEGIN DMA1_Channel6_IRQn 0 */
/* USER CODE END DMA1_Channel6_IRQn 0 */
HAL_DMA_IRQHandler(&hdma_i2c1_tx);
/* USER CODE BEGIN DMA1_Channel6_IRQn 1 */
/* USER CODE END DMA1_Channel6_IRQn 1 */
}
/**
* @brief This function handles DMA1 channel7 global interrupt.
*/
void DMA1_Channel7_IRQHandler(void)
{
/* USER CODE BEGIN DMA1_Channel7_IRQn 0 */
/* USER CODE END DMA1_Channel7_IRQn 0 */
HAL_DMA_IRQHandler(&hdma_i2c1_rx);
/* USER CODE BEGIN DMA1_Channel7_IRQn 1 */
/* USER CODE END DMA1_Channel7_IRQn 1 */
}
/**
* @brief This function handles TIM3 global interrupt.
*/
void TIM3_IRQHandler(void)
{
/* USER CODE BEGIN TIM3_IRQn 0 */
/* USER CODE END TIM3_IRQn 0 */
HAL_TIM_IRQHandler(&htim3);
/* USER CODE BEGIN TIM3_IRQn 1 */
/* USER CODE END TIM3_IRQn 1 */
}
/**
* @brief This function handles I2C1 event interrupt.
*/
void I2C1_EV_IRQHandler(void)
{
/* USER CODE BEGIN I2C1_EV_IRQn 0 */
/* USER CODE END I2C1_EV_IRQn 0 */
HAL_I2C_EV_IRQHandler(&hi2c1);
/* USER CODE BEGIN I2C1_EV_IRQn 1 */
/* USER CODE END I2C1_EV_IRQn 1 */
}
/**
* @brief This function handles USART1 global interrupt.
*/
void USART1_IRQHandler(void)
{
/* USER CODE BEGIN USART1_IRQn 0 */
/* USER CODE END USART1_IRQn 0 */
HAL_UART_IRQHandler(&huart1);
/* USER CODE BEGIN USART1_IRQn 1 */
if(__HAL_UART_GET_IT_SOURCE(&huart1, UART_IT_RXNE)!= RESET)
{
prvvUARTRxISR();//接收中断
}
if(__HAL_UART_GET_IT_SOURCE(&huart1, UART_IT_TXE)!= RESET)
{
prvvUARTTxReadyISR();//发送中断
}
HAL_NVIC_ClearPendingIRQ(USART1_IRQn);
HAL_UART_IRQHandler(&huart1);
/* USER CODE END USART1_IRQn 1 */
}
/* USER CODE BEGIN 1 */
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) //定时器中断回调函数，用于连接porttimer.c文件的函数
{
/* NOTE : This function Should not be modified, when the callback is needed,
the __HAL_TIM_PeriodElapsedCallback could be implemented in the user file
*/
prvvTIMERExpiredISR( );
}
/* USER CODE END 1 */demo.c文件：
/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
#include "AHT20-21_DEMO_V1_3.h"
/* ----------------------- Defines ------------------------------------------*/
#define REG_INPUT_START 0
#define REG_INPUT_NREGS 5
/* ----------------------- Static variables ---------------------------------*/
static USHORT usRegInputStart = REG_INPUT_START;
//static
uint16_t usRegInputBuf[REG_INPUT_NREGS];
uint16_t InputBuff[5];
uint32_t CT_data[2]={0,0};
volatile int c1,c2,t1,t2;
eMBErrorCode
eMBRegInputCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs )
{
eMBErrorCode eStatus = MB_ENOERR;
int iRegIndex;
int i;
AHT20_Read_CTdata_crc(CT_data); //crc校验后，读取AHT20的温度和湿度数据
c1 = CT_data[0]*1000/1024/1024; //计算得到湿度值c1（放大了10倍）
t1 = CT_data[1]*2000/1024/1024-500;//计算得到温度值t1（放大了10倍）
c2 = c1/10 + (c1/10)%10;
t2 = t1/10 + (t1/10)%10;
InputBuff[0] = t2;
InputBuff[1] = c2;
InputBuff[2] = 0x01;
InputBuff[3] = 0x01;
if( ( usAddress >= REG_INPUT_START )
&& ( usAddress + usNRegs <= REG_INPUT_START + REG_INPUT_NREGS ) )
{
iRegIndex = ( int )( usAddress - usRegInputStart );
for(i=0;i<usNRegs;i++)
{
*pucRegBuffer=InputBuff[i+usAddress-1]>>8;
pucRegBuffer++;
*pucRegBuffer=InputBuff[i+usAddress-1]&0xff;
pucRegBuffer++;
}
}
else
{
eStatus = MB_ENOREG;
}
return eStatus;
}
eMBErrorCode
eMBRegHoldingCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs,
eMBRegisterMode eMode )
{
return MB_ENOREG;
}
eMBErrorCode
eMBRegCoilsCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNCoils,
eMBRegisterMode eMode )
{
return MB_ENOREG;
}
eMBErrorCode
eMBRegDiscreteCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNDiscrete )
{
return MB_ENOREG;
}然后编译运行
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