关于STM32+w5500实现的MODBUS的过程！

2万 · 2017-8-1 16:26

各位好！
经过摸索，这段时间主要实现了一个STM32与W5500的实现MODBUS的过程！

这方面的资料，网上可能也有不少！

现在给大家共享一下自己的研究结果。

另外还是想实现FREEMODBUS！

2万 · 2017-8-1 16:27

请看截图！

2万 · 2017-8-1 16:35

#include "main.h"

uint8 mac[6]={0x00,0x08,0xdc,0x11,0x11,0x11};/*定义Mac变量*/
uint8 lip[4]={192,168,5,101};/*定义lp变量*/
uint16 MYPORT=6000;
uint8 sub[4]={255,255,255,0};/*定义subnet变量*/
uint8 gw[4]={192,168,5,1};/*定义gateway变量*/
uint8 ip[4];

uint8 buffer[2048];/*定义一个2KB的缓存*/
uint8 modbus_send[2048];/*定义一个2KB的缓存*/

2万 · 2017-8-1 16:35

int main(void)
{
  uint16 len=0;
uint8 SocketChanel=0;
uint16 modbus_len;

RCC_Configuration();
GPIO_Configuration();

Systick_Init(72);/* 初始化Systick工作时钟*/
USART1_Init(); /*初始化串口通信:9600@8-n-1*/
printf("STM32 initialization over.\r\n");

Reset_W5500();/*硬重启W5500*/
  WIZ_SPI_Init();/*初始化SPI接口*/
  printf("W5500 initialized!\r\n");

setSHAR(mac);/*配置Mac地址*/
  setSUBR(sub);/*配置子网掩码*/
  setGAR(gw);/*配置默认网关*/
  setSIPR(lip);/*配置Ip地址*/

//Init. TX & RX Memory size of w5500
  sysinit(txsize, rxsize); /*初始化8个socket*/

setRTR(2000);/*设置溢出时间值*/
  setRCR(5);/*设置最大重新发送次数*/

getSIPR (ip);
  printf("IP : %d.%d.%d.%d\r\n", ip[0],ip[1],ip[2],ip[3]);
  getSUBR(ip);
  printf("SN : %d.%d.%d.%d\r\n", ip[0],ip[1],ip[2],ip[3]);
  getGAR(ip);
  printf("GW : %d.%d.%d.%d\r\n", ip[0],ip[1],ip[2],ip[3]);
  printf("Network is ready.\r\n");
setkeepalive(0);

  while (1)
  {
   switch(getSn_SR(SocketChanel))/*获取socket0的状态*/
   {
      case SOCK_INIT:/*socket初始化完成*/
         listen(SocketChanel);/*在TCP模式下向服务器发送连接请求*/

         break;
      case SOCK_ESTABLISHED:/*socket连接建立*/

         if(getSn_IR(SocketChanel) & Sn_IR_CON)
         {
            setSn_IR(SocketChanel, Sn_IR_CON);/*Sn_IR的第0位置1*/
         }
         len=getSn_RX_RSR(SocketChanel);/*len为已接收数据的大小*/
         if(len>0)
         {

         memset(buffer,0x00,len+1);

            recv(SocketChanel,buffer,len);/*W5200接收来自Sever的数据*/

   modbus_len = tcp_modslv(buffer,modbus_send);

   if(modbus_len > 6)
{
               send(SocketChanel,modbus_send,modbus_len);/*W5200向Server发送数据*/
}

         }
send_ka(SocketChanel);       /*防止网线断开*/

         break;
      case SOCK_CLOSE_WAIT:/*socket等待关闭状态*/
   disconnect(SocketChanel); //防止上位机软件断开重新连接的时候还能打开SOCKET
         break;
      case SOCK_CLOSED:/*socket关闭*/
         socket(SocketChanel,Sn_MR_TCP,MYPORT,Sn_MR_ND);/*打开socket0的一个端口*/
         break;
   }
if((rtubuf1[0] & 0x01) == 0x01)  LED_ON;
   else                            LED_OFF;

  }
}

2万 · 2017-8-1 16:37

void RCC_Configuration(void)
{

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |RCC_APB2Periph_GPIOC
       | RCC_APB2Periph_AFIO  | RCC_APB2Periph_USART1, ENABLE);
}

void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  GPIO_InitStructure.GPIO_Pin = LED;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  GPIO_SetBits(GPIOB, LED); // led off

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Pin =  USART1_TX;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_InitStructure.GPIO_Pin = USART1_RX;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  // SPI
  /* Configure SPIy pins: SCK, MISO and MOSI */
  GPIO_InitStructure.GPIO_Pin = WIZ_SCLK | WIZ_MISO | WIZ_MOSI;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = WIZ_SCS|LED;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
  GPIO_SetBits(GPIOB, WIZ_SCS);

  GPIO_InitStructure.GPIO_Pin = WIZ_RESET ;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  GPIO_SetBits(GPIOA, WIZ_RESET);


  GPIO_InitStructure.GPIO_Pin = WIZ_INT;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

}