Hello,
I have been having issues converting over a sketch from the ethernet shield over to the wifi shield. Particularly with multibyte writes and closing the connection. I modified the WebServer sketch which exposes these issues(see below). I suspect that they are due to some issues with the SPI driver. If you stay under about 50 bytes on the multibyte write you are fine. If you goto 90 you might be OK. If you goto 100 bytes forget about it. Size of the file doesn't seem to be a factor. As for the connection, sometimes it closes properly, sometimes it closes too soon, sometimes it doesn't close at all. Arduino could you fix these issues? Also, could you give people a way to identify the connection(in the ethernet an wifi libraries), specifically the remoteport?
Thanks,
-diesel
/*
Web Server
A simple web server that shows the value of the analog input pins.
using a WiFi shield.
This example is written for a network using WPA encryption. For
WEP or WPA, change the Wifi.begin() call accordingly.
Circuit:
- WiFi shield attached
- Analog inputs attached to pins A0 through A5 (optional)
created 13 July 2010
by dlf (Metodo2 srl)
modified 31 May 2012
by Tom Igoe
*/
#include <SPI.h>
#include <WiFi.h>
#include <SdFat.h>
char ssid[] = "ssid"; // your network SSID (name)
char key[] = "key"; // your network password
int keyIndex = 1; // your network key Index number (needed only for WEP)
int status = WL_IDLE_STATUS;
WiFiServer server(80);
SdFat sd;
SdFile file;
uint8_t buf[201];
void setup() {
pinMode(10,OUTPUT);
digitalWrite(10,HIGH);
sd.init(SPI_FULL_SPEED,4);
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue:
while(true);
}
// attempt to connect to Wifi network:
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
//status = WiFi.begin(ssid, pass);
status = WiFi.begin(ssid, keyIndex, key);
// wait 10 seconds for connection:
delay(10000);
}
server.begin();
// you're connected now, so print out the status:
printWifiStatus();
}
void loop() {
// listen for incoming clients
WiFiClient client = server.available();
if (client) {
Serial.println("new client");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
//client.println("Connnection: close");
client.println();
client.println();
pinMode(10,OUTPUT);
digitalWrite(10,HIGH);
sd.chdir("/");
file.open("page.htm",O_READ); ///page file was a basic html file with lorem ipsum, 1kb-4kb
uint16_t x = file.fileSize();
uint16_t y=100; /// *********************************************bytes to write each time thru loop
while(x){
if(x<y) {y=x;}
pinMode(10,OUTPUT);
digitalWrite(10,HIGH);
file.read(buf,y);
pinMode(4,OUTPUT);
digitalWrite(4,HIGH);
client.write(buf,y);///**********************************************************problem
x-=y;
Serial.write(buf,y);///**********************************************************debugging
Serial.print("x=");
Serial.println(x,DEC);
}
file.close();
//client.println("");
//client.println("");
//client.println("");
break;
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
}
else if (c != '\r') {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(1);
// close the connection:
client.stop();
Serial.println("client disonnected");
}
}
void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}