intel Curie/Arduino 101入门开发套件之TF卡模块读写使用教程

由 selina 提交于周六, 25 六月 2016 - 13:43

TF卡读写储存模块是互动媒体设备最常用存储模块，采用SPI接口。模块可以通过杜邦线与Arduino传感器扩展板连接，编写相应的程序可以实现各种传感器（如温湿度传感器、光线传感器，GPS 等等）数据记录等功能，通过读卡器将TF卡数据读出，便可轻松加以分析利用，模块并带有两个LED灯以指示TF卡工作状态。（指示灯说明：1、当接上电源未插卡时，一个LED常亮，表示模块供电正常。2、插入卡后常亮的LED开始闪速，表示TF卡已经插入。3、另一个LED闪烁是表示正在通信。） 
在配合Arduino101的使用中接线方式可以与uno相同：
1、CD：用户可用来检测卡是否插入，不使用可不连接(例程中不使用)
2、CS：TF卡片选，例程中需连接到4号脚(在没有使用其他SPI设备时可不连接)
3、MOSI：连接到arduino的MOSI口，在101上为11号引脚
4、MISO：连接到arduino的MISO口，在101上为12号引脚
5、SCK：连接到arduino的SCLK口，在101上为13号引脚
6、VCC：电源供电正端，连接到5V
7、GND：电源供电负端，连接到电源负极，GND
<center>
<img alt="" src="http://intel.eetrend.com/files/2016-06/wen_zhang_/100001798-5051-010.pn…; />
</center>
 
硬件连接好以后，打开Arduino IDE找到文件-示例-SD-Cardlnfo。 
<center>
<img alt="" src="http://intel.eetrend.com/files/2016-06/wen_zhang_/100001798-5052-020.pn…; />
</center>
/* 
SD card test
 This example shows how use the utility libraries on which the' 
SD library is based in order to get info about your SD card. 
Very useful for testing a card when you're not sure whether its working or not.
 The circuit: 
* SD card attached to SPI bus as follows: 
** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila 
** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila 
** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila 
** CS - depends on your SD card shield or module. 
Pin 4 used here for consistency with other Arduino examples
 created 28 Mar 2011 
by Limor Fried 
modified 9 Apr 2012 
by Tom Igoe 
*/ 
// include the SD library: 
#include 
#include 
// set up variables using the SD utility library functions: 
Sd2Card card; 
SdVolume volume; 
SdFile root;
// change this to match your SD shield or module; 
// Arduino Ethernet shield: pin 4 
// Adafruit SD shields and modules: pin 10 
// Sparkfun SD shield: pin 8 
const int chipSelect = 4;
void setup() { 
// Open serial communications and wait for port to open: 
Serial.begin(9600); 
while (!Serial) { 
; // wait for serial port to connect. Needed for native USB port only 
}
 Serial.print("\nInitializing SD card...");
 // we'll use the initialization code from the utility libraries 
// since we're just testing if the card is working! 
if (!card.init(SPI_HALF_SPEED, chipSelect)) { 
Serial.println("initialization failed. Things to check:"); 
Serial.println("* is a card inserted?"); 
Serial.println("* is your wiring correct?"); 
Serial.println("* did you change the chipSelect pin to match your shield or module?"); 
return; 
} else { 
Serial.println("Wiring is correct and a card is present."); 
}
 // print the type of card 
Serial.print("\nCard type: "); 
switch (card.type()) { 
case SD_CARD_TYPE_SD1: 
Serial.println("SD1"); 
break; 
case SD_CARD_TYPE_SD2: 
Serial.println("SD2"); 
break; 
case SD_CARD_TYPE_SDHC: 
Serial.println("SDHC"); 
break; 
default: 
Serial.println("Unknown"); 
}
 // Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32 
if (!volume.init(card)) { 
Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card"); 
return; 
}
 // print the type and size of the first FAT-type volume 
uint32_t volumesize; 
Serial.print("\nVolume type is FAT"); 
Serial.println(volume.fatType(), DEC); 
Serial.println();
 volumesize = volume.blocksPerCluster(); // clusters are collections of blocks 
volumesize *= volume.clusterCount(); // we'll have a lot of clusters 
volumesize *= 512; // SD card blocks are always 512 bytes 
Serial.print("Volume size (bytes): "); 
Serial.println(volumesize); 
Serial.print("Volume size (Kbytes): "); 
volumesize /= 1024; 
Serial.println(volumesize); 
Serial.print("Volume size (Mbytes): "); 
volumesize /= 1024; 
Serial.println(volumesize);
 Serial.println("\nFiles found on the card (name, date and size in bytes): "); 
root.openRoot(volume);
 // list all files in the card with date and size 
root.ls(LS_R | LS_DATE | LS_SIZE); 
}
void loop(void) {
} 
烧写官方的例程，上传程序后，等待系统启动（大约5s）；
打开串口监视器，可以看到Arduino 101返回的信息，此时，如果TF卡里有内容的话，就会返回目录下的文件信息；
<center>
<img alt="" src="http://intel.eetrend.com/files/2016-06/wen_zhang_/100001798-5053-3.png&…; />
</center>
 
需要注意的是，TF或SD卡的文件格式必须为FAT32或FAT16，否则系统无法读取内存卡的信息。
如何读取TF卡里的内容，我们已经得到了掌握，那么接下来我们学习另一个重要的功能——在TF卡里创建一个文件，你并写入内容。
准备好硬件以后，打开ArduinoIDE，找到文件-示例-SD-readWrite，如图；
<center>
<img alt="" src="http://intel.eetrend.com/files/2016-06/wen_zhang_/100001798-5054-040.pn…; />
</center>
 
可以看到如下代码。
/* 
SD card read/write
 This example shows how to read and write data to and from an SD card file 
The circuit: 
* SD card attached to SPI bus as follows: 
** MOSI - pin 11 
** MISO - pin 12 
** CLK - pin 13 
** CS - pin 4
 created Nov 2010 
by David A. Mellis 
modified 9 Apr 2012 
by Tom Igoe
 This example code is in the public domain.
 */
#include 
#include 
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 native USB port only 
}
 Serial.print("Initializing SD card...");
 if (!SD.begin(4)) { 
Serial.println("initialization failed!"); 
return; 
} 
Serial.println("initialization done.");
 // open the file. note that only one file can be open at a time, 
// so you have to close this one before opening another. 
myFile = SD.open("test.txt", FILE_WRITE);
 // if the file opened okay, write to it: 
if (myFile) { 
Serial.print("Writing to test.txt..."); 
myFile.println("testing 1, 2, 3."); 
// close the file: 
myFile.close(); 
Serial.println("done."); 
} else { 
// if the file didn't open, print an error: 
Serial.println("error opening test.txt"); 
}
 // re-open the file for reading: 
myFile = SD.open("test.txt"); 
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 test.txt"); 
} 
}
void loop() { 
// nothing happens after setup 
}
代码的功能，是在其读到TF卡后，使用SD.open("test.txt", FILE_WRITE);创建了一个名为test.txt的文件夹，随后使用myFile.println("testing 1, 2, 3.");语句向txt文件中写入了testing 1, 2, 3.； 
我们下载后，打开串口监视器，可以在屏幕中看到输出的信息；
<center>
<img alt="" src="http://intel.eetrend.com/files/2016-06/wen_zhang_/100001798-5055-050.pn…; />
</center>
 
此时，我们把TF卡取出来插到电脑上验证一下是否有这个文件夹以及文件；
<center>
<img alt="" src="http://intel.eetrend.com/files/2016-06/wen_zhang_/100001798-5056-060.pn…; />
</center>
 
可以看到被创建的test.txt以及里面的内容testing 1，2，3，；
文章来源：<a href="http://www.arduino.cn/thread-21592-1-1.html">Aduino中文社区</a>