Fireduino TFT 图片显示
更新时间：2017-08-08 阅读：13986
目录
Fireduino TFT
Fireduino TFT 采用与传统的Arduino TFT 同属一些列的LCD 驱动器，为ST7735S，与Fireduino 通过I8080 接口连接，比传统Arduino TFT 的SPI 方式 刷新速率快一个级别。
Fireduino TFT库
Fireduino TFT 库 基于ST7735S 驱动扩展 Adafruit GFX 而成的TFT库，Adafruit GFX负责绘制图形，ST7735S 负责驱动LCD 显示屏，它兼容 Adafruit GFX API，Fireduino 连接 TFT 后如下图：
Fireduino TFT 图片显示
本案例演示如何在Fireduino 的TFT配件上显示图像，在TF卡读取文件后，随机定位显示在屏幕上。
硬件要求
1.Fireduino board
2.Fireduino TFT board
3.TF Card
4.图像文件
代码
开始之前
使用TFT 屏幕，首先得包含TFT库以及需要使用到的TF库头文件。
#include <TF.h> #include <TFT.h>
定义你的TFT 屏幕，并创建一个实例对象
TFT TFTscreen = TFT();
有一种特殊的数据类型用于描述图像信息，创建它的对象。
PImage logo;setup()
1.初始化屏幕。
2.设置背景色。
3.显示静态文本提示信息在屏幕。
4.初始化串口，以供信息打印输出。
5.初始化TF卡。
6.从TF卡载入图像文件。
void setup() { // initialize the GLCD and show a message // asking the user to open the serial line delay(1); TFTscreen.begin(); delay(1); TFTscreen.background(255, 255, 255); TFTscreen.stroke(0, 0, 255); TFTscreen.println(); TFTscreen.println(F("Arduino TFT Bitmap Example")); TFTscreen.stroke(0, 0, 0); TFTscreen.println(F("Open serial monitor")); TFTscreen.println(F("to run the sketch")); // initialize the serial port: it will be used to // print some diagnostic info Serial.begin(9600); while (!Serial) { // wait for serial port to connect. Needed for native USB port only } // clear the GLCD screen before starting TFTscreen.background(255, 255, 255); // try to access the SD card. If that fails (e.g. // no card present), the setup process will stop. Serial.print(F("Initializing SD card...")); if (!SD.begin()) { Serial.println(F("failed!")); return; } Serial.println(F("OK!")); // initialize and clear the GLCD screen TFTscreen.begin(); TFTscreen.background(255, 255, 255); // now that the SD card can be access, try to load the // image file. logo = TFTscreen.loadImage("arduino.bmp"); if (!logo.isValid()) { Serial.println(F("error while loading arduino.bmp")); } }
loop()
1.判断图像文件的正确性。
2.随机生成图片显示的位置。
3.把图片显示在屏幕上。
void loop() { // don't do anything if the image wasn't loaded correctly. if (logo.isValid() == false) { return; } Serial.println(F("drawing image")); // get a random location where to draw the image. // To avoid the image to be draw outside the screen, // take into account the image size. int x = random(TFTscreen.width() - logo.width()); int y = random(TFTscreen.height() - logo.height()); // draw the image to the screen TFTscreen.image(logo, x, y); // wait a little bit before drawing again delay(1500); }
例程序 -- TFT 图片显示
// include the necessary libraries #include <TF.h> #include <TFT.h> // Arduino LCD library TFT TFTscreen = TFT(); // this variable represents the image to be drawn on screen PImage logo; void setup() { // initialize the GLCD and show a message // asking the user to open the serial line delay(1); TFTscreen.begin(); delay(1); TFTscreen.background(255, 255, 255); TFTscreen.stroke(0, 0, 255); TFTscreen.println(); TFTscreen.println(F("Arduino TFT Bitmap Example")); TFTscreen.stroke(0, 0, 0); TFTscreen.println(F("Open serial monitor")); TFTscreen.println(F("to run the sketch")); // initialize the serial port: it will be used to // print some diagnostic info Serial.begin(9600); while (!Serial) { // wait for serial port to connect. Needed for native USB port only } // clear the GLCD screen before starting TFTscreen.background(255, 255, 255); // try to access the SD card. If that fails (e.g. // no card present), the setup process will stop. Serial.print(F("Initializing SD card...")); if (!SD.begin()) { Serial.println(F("failed!")); return; } Serial.println(F("OK!")); // initialize and clear the GLCD screen TFTscreen.begin(); TFTscreen.background(255, 255, 255); // now that the SD card can be access, try to load the // image file. logo = TFTscreen.loadImage("arduino.bmp"); if (!logo.isValid()) { Serial.println(F("error while loading arduino.bmp")); } } void loop() { // don't do anything if the image wasn't loaded correctly. if (logo.isValid() == false) { return; } Serial.println(F("drawing image")); // get a random location where to draw the image. // To avoid the image to be draw outside the screen, // take into account the image size. int x = random(TFTscreen.width() - logo.width()); int y = random(TFTscreen.height() - logo.height()); // draw the image to the screen TFTscreen.image(logo, x, y); // wait a little bit before drawing again delay(1500); }
