SdFile readFile; if (!readFile.open(FILENAME, O_READ)) { Serial.println("无法打开文件进行读取"); tft.println("Cannot open file for reading"); while (1); } char buffer[100]; // 足够大的缓冲区,以容纳消息 int bytesRead = readFile.read(buffer, sizeof(buffer) - 1); if (bytesRead...
然后使用该myFile.read()功能,我们将从文件中读取并将其打印在串行监视器上。该read()函数实际上一次只读取一个字符,因此,我们需要使用“ while”循环和该函数myFile.available()来读取文件中的所有字符。最后,我们需要关闭文件。 myFile = SD.open("test.txt"); if (myFile) { Serial.println("test.txt:...
EEPROM.begin(EEPROM_SIZE);pictureNumber=EEPROM.read(0)+1;//Path where new picture will be savedinSD Card String path="/picture"+String(pictureNumber)+".jpg";fs::FS&fs=SD_MMC;Serial.printf("Picture file name: %s\n",path.c_str());Filefile=fs.open(path.c_str(),FILE_WRITE);if(!
一旦被打开,用myFile.println()将字符串写入卡片,后面跟着一个回车。一旦内容被写入,关闭文件。 再次,用SD.open()打开该文件。一旦打开,用SD.read()让Arduino读文件的内容,并发送他们到串口。读取所有文件的内容后,用SD.close()关闭文件。 /* SD card read/write This example shows how to read and write ...
Small E-reader With Oled + Arduino, Test: This is my first pass at a very small e-reader using an oled screen and an arduino. The goal is to read any text file from an SD card with a form factor < 1 square inch. This instructable is only the very bas
Learn how Arduino read and write data from/to Micro SD Card. Learn how to connect Arduino to Micro SD Card
如果您熟悉并习惯于处理单个字节的数据,那么Serial.read()、Serial.readByte()和其他一些可能会有用。然而,这不是我们要用的。为了使事情简单一点,我们将使用Serial.parseInt()和Serial.readString()方法。当从串行流中读取时,这两种方法完成了大部分工作。
// 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 ...
// User defined information reported by "Read_User_Setup" test & diagnostics example #define USER_SETUP_INFO "User_Setup" // Define to disable all #warnings in library (can be put in User_Setup_Select.h) //#define DISABLE_ALL_LIBRARY_WARNINGS ...
(tft_output);//解码成功回调函数 } uint16_t read_count=0;//读取buff的长度 uint8_t pack_size[2];//用来装包大小字节 uint16_t frame_size;//当前帧大小 float start_time,end_time;//帧处理开始和结束时间 float receive_time,deal_time;//帧接收和解码时间 void loop() { // put your main...