零知ESP8266与零知板使用SPI接口连接 提高传输速率

/*

WiFiSPI example: esp8266连接AP，UDP传输数据

 

电路连接：

   1. On ESP8266 must be running (flashed) WiFiSPIESP application.

     

   2. Connect the Arduino to the following pins on the esp8266:

 

            ESP8266         |

    GPIO    NodeMCU   Name  |   Lingzhi Enhanced Board

   ===================================

     15       D8       SS   |   53

     13       D7      MOSI  |   51

     12       D6      MISO  |   50

     14       D5      SCK   |   52

*/

 

#include "WiFiSpi.h"

#include "WiFiSpiUdp.h"

 

//热点名称

char ssid[] = "lingzhilab";     

char pass[] = "lingzhilab.com";  

 

unsigned int localPort = 8081;

 

char udpServerIP[] = "192.168.0.122";

int serverPort = 8081;

 

#define PACKET_SIZE 256

byte packetBuffer[PACKET_SIZE];

 

const int UDP_TIMEOUT = 2000;

 

WiFiSpiUdp udpClient;

 

void setup()

{

  // initialize serial for debugging

  Serial.begin(9600);

  // initialize the ESP module

  WiFiSpi.init();

 

  // 检查是否连接了运行SPIWifi程序的8266模块

  if (WiFiSpi.status() == WL_NO_SHIELD) {

    Serial.println("WiFi shield not present");

    // don't continue

    while (true);

  }

 

  int status = WL_IDLE_STATUS;

  // attempt to connect to WiFi network

  while (status != WL_CONNECTED) {

    Serial.print("Attempting to connect to WPA SSID: ");

    Serial.println(ssid);

    // Connect to WPA/WPA2 network

    status = WiFiSpi.begin(ssid, pass);

  }

 

  // you're connected now, so print out the data

  Serial.println("You're connected to the network");

   

  udpClient.begin(localPort);

}

 

void loop()

{

  sendPacket(udpServerIP); // send an packet to server

   

  // wait for a reply for UDP_TIMEOUT miliseconds

  unsigned long startMs = millis();

  while (!udpClient.parsePacket() && (millis() - startMs) < UDP_TIMEOUT) {}

 

  // when there should be a packet do not call parsePacket() once more, call available() instead

  if (udpClient.available()) {

    Serial.println("packet received:");

    // We've received a packet, read the data from it into the buffer

    udpClient.read(packetBuffer, PACKET_SIZE);

 

    Serial.println((char*)packetBuffer);

     

    Serial.println();

     

  }

 

  // wait ten seconds before asking for the time again

  delay(1000);

}

 

// send an packet to server 

void sendPacket(char *server)

{

  // set all bytes in the buffer to 0

  memset(packetBuffer, 0, PACKET_SIZE);

     

  strcpy((char*)packetBuffer, "message from UDP client\r\n");

 

  udpClient.beginPacket(server, serverPort); 

 

  udpClient.write(packetBuffer, PACKET_SIZE);

 

  udpClient.endPacket();

}

char udpServerIP[] = "192.168.0.122";