代码如下，W5100初始化成功后，在调用SD卡库就不能对卡进行操作了。
实地检测，如果在5100初始化成功后，把片选直接拉高，sd卡也不能进行操作。
5100芯片内部发生了什么
/*
Web client
This sketch connects to a website (http://www.google.com)
using an Arduino Wiznet Ethernet shield.
Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13
created 18 Dec 2009
by David A. Mellis
modified 9 Apr 2012
by Tom Igoe, based on work by Adrian McEwen
*/
#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>
// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)
char server[] = "185.119.255.57"; // name address for Google (using DNS)
// Set the static IP address to use if the DHCP fails to assign
IPAddress ip(192, 168, 199, 177);
// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;
/*TF卡*/
File myFile;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
pinMode(10, OUTPUT);
digitalWrite(10,HIGH);
pinMode(10, OUTPUT);
digitalWrite(4,LOW);
if (!SD.begin(4)) {
Serial.println("init failed!");
return;
}
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
// no point in carrying on, so do nothing forevermore:
// try to congifure using IP address instead of DHCP:
Ethernet.begin(mac, ip);
}
// give the Ethernet shield a second to initialize:
delay(1000);
Serial.println("connecting...");
digitalWrite(10,INPUT);
// if you get a connection, report back via serial:
if (client.connect(server, 80)) {
Serial.println("connected");
// // Make a HTTP request:
client.println("POST /disk/ HTTP/1.1\r");
client.println("Accept: text/html, application/xhtml+xml, image/jxr, */*");
client.println("Referer: http://185.119.255.57/disk/");
client.println("Accept-Language: zh-CN");
client.println("Content-Type: multipart/form-data; boundary=sosad");
client.println("Origin: http: //185.119.255.57");
client.println("Accept-Encoding: gzip, deflate");
client.println("Host: 185.119.255.57");
client.println("Content-Length: 613");
client.println("Connection: Keep-Alive");
client.println("Cache-Control: no-cache");
client.print("\n");
client.println("--sosad");
client.println("Content-Disposition: form-data; name=\"username\"");
client.println();
client.println("surunbing");
client.println("--sosad");
client.println("Content-Disposition: form-dat; name=\"headImg\"; filename=\"test.txt\"");
client.println("Content-Type: text/plain");
client.println();
myFile = SD.open("test.txt",FILE_READ);
if (myFile) {
Serial.println("test.txt:");
// read from the file until there's nothing else in it:
while (myFile.available()) {
Serial.write(myFile.read());
}
// close the file:
myFile.close();
} else {
// if the file didn't open, print an error:
Serial.println("error opening");
}
client.println();
client.println("--sosad--");
client.stop();
}
else {
// kf you didn't get a connection to the server:
Serial.println("connection failed");
}
}
void loop()
{
// if there are incoming bytes available
// from the server, read them and print them:
if (client.available()) {
char c = client.read();
Serial.print(c);
}
}
|
发表于 2016-4-24 22:18:39
楼主