(SKU:RB-02S018A) TF卡讀寫(xiě)模塊
來(lái)自ALSROBOT WiKi
目錄 |
產(chǎn)品概述
該模塊(MicroSD Card Adapter)是Micro SD卡讀寫(xiě)模塊,通過(guò)文件系統(tǒng)及SPI接口驅(qū)動(dòng)程序,單片機(jī)系統(tǒng)即可完成MicroSD卡內(nèi)的文件進(jìn)行讀寫(xiě)。Arduino用戶可直接使用Arduino IDE自帶的SD卡程序庫(kù)即可完成卡的初始化和讀寫(xiě)。
模塊特點(diǎn)如下:
- 支持Micro SD卡、Micro SDHC卡(高速卡)
- 板載電平轉(zhuǎn)換電路,即接口電平可為5V或3.3V
- 供電電源為4.5V - 5.5V,板載3.3V穩(wěn)壓電路
- 通信接口為標(biāo)準(zhǔn)SPI接口
- 4個(gè)M2螺絲定位孔,便于安裝
規(guī)格參數(shù)
- 工作電壓:3.3V - 5V
- 產(chǎn)品尺寸:40mm * 28mm
- 重量大?。?g
- 信號(hào)類型:模擬信號(hào)
- 固定孔:M3 * 4個(gè)
- 通信接口:標(biāo)準(zhǔn) SPI 接口
- 支持卡類型:Micro SD 卡(< = 2G),Micro SDHC 卡(< = 32G)
接口定義
- + :電源正
- - :電源地
- DI :串行數(shù)據(jù)輸入
- DO :串行數(shù)據(jù)輸出
- CK :串行時(shí)鐘
- CS :片選信號(hào),由控制器進(jìn)行控制
使用方法
工作原理
TF 卡模塊使用 SPI 總線連接方式實(shí)現(xiàn)與 Arduino 控制器的通信,穩(wěn)壓芯片輸出的 3.3V 為電平轉(zhuǎn)換芯片、Micro SD 卡進(jìn)行供電,電平轉(zhuǎn)換電路往 Micro SD 卡方向的信號(hào)轉(zhuǎn)換成 3.3V,Micro SD 卡往控制接口方向的 MISO 信號(hào)也轉(zhuǎn)換成了 3.3V,一般 AVR 單片機(jī)系統(tǒng)都可以讀取該信號(hào),產(chǎn)品使用自彈式卡座,方便卡的插拔。
編程原理
TF 卡模塊共引出 6 個(gè)引腳,其中 DO、CK、DI 是 SPI 總線接口,“+”為電源正,“-”為電源GND,CS為片選端,實(shí)際使用時(shí)依照下面的接線圖連接即可,使用 Arduino IDE 自帶的例子程序就可以進(jìn)行測(cè)試。
連接示意圖
例子程序
/* SD card test * 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 */ // include the SD library: #include <SPI.h> #include <SD.h> // 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 Leonardo 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) { }
程序效果
程序編譯上傳無(wú)誤之后,將準(zhǔn)備好的 TF 卡插入到模塊中,連接 TF 卡模塊和 Arduino UNO 控制器,連接正常情況下,會(huì)顯示出卡的信息,如下圖所示: