我正在尝试用 TFT 触摸板构建一个菜单。现在我的问题是我无法在循环函数中绘制任何内容。
如果我在循环中编写任何绘图函数,屏幕就会变成白色。我认为这是因为屏幕需要一些时间来建立。所以我添加了一个延迟(1000)。但屏幕每秒都会闪烁,这显然也不是我想要的。
下一个奇怪的事情是,当我触摸显示器后进行绘制时,程序停止工作。在下面的代码中我有三个绘图函数。其中两个在工作,一个不在。 (见评论)
#include <SeeedTouchScreen.h>
#include <TFTConsole.h>
#include <Adafruit_TFTLCD.h>
#include <Adafruit_GFX.h>
#define LCD_CS A3
#define LCD_CD A2
#define LCD_WR A1
#define LCD_RD A0
#define LCD_RESET A4
#define TS_MINX 169
#define TS_MINY 208
#define TS_MAXX 1781
#define TS_MAXY 1820
#define YP A2 // must be an analog pin, use "An" notation!
#define XM A3 // must be an analog pin, use "An" notation!
#define YM 8 // can be a digital pin
#define XP 9 // can be a digital pin
#define BLACK 0x0000
#define BLUE 0x001F
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFFE0
#define WHITE 0xFFFF
Adafruit_TFTLCD tft(LCD_CS, LCD_CD, LCD_WR, LCD_RD, LCD_RESET);
TouchScreen ts = TouchScreen(XP, YP, XM, YM);
boolean touched = false;
void setup() {
Serial.begin(9600);
Serial.print("Starting...");
tft.reset();
tft.begin(0x9325);
tft.setRotation(1);
tft.fillScreen(BLACK);
//Print "PPM CO" Text
tft.setCursor(50, 30);
tft.setTextColor(GREEN);
tft.setTextSize(3);
tft.print("Hello World"); //<- this is displayed fine
delay(1000);
}
boolean first = true;
void loop() {
if (first) {
first = false;
tft.drawCircle(119, 160, 20, random(0xFFFF)); //<- This is also displayed
}
Point p = ts.getPoint();
p.x = map(p.x, TS_MINX, TS_MAXX, 0, 240);
p.y = map(p.y, TS_MINY, TS_MAXY, 0, 320);
if (p.x <= 240 && p.y <= 320 && p.x >= 0 && p.y >= 0) {
Serial.println("don't touch me!");
touched = true;
}
else {
touched = false;
}
if (touched) {
tft.drawCircle(119, 180, 20, RED); //<- This is not displayed and makes the screen flash
delay(1000);
}
//tft.fillScreen(BLUE);
//delay(500);
}
只有当我在代码中有最后一个drawCircle时,如果我停止触摸显示屏,变量touched不会切换回false。
有人知道我做错了什么吗?
更新:我通过让触摸事件仅在触摸显示屏时发生一次来阻止显示屏闪烁。但我仍然遇到什么都没有绘制的问题...
void loop() {
//Touchposition bestimmen
Point p = ts.getPoint();
p.x = map(p.x, TS_MINX, TS_MAXX, 0, 240);
p.y = map(p.y, TS_MINY, TS_MAXY, 0, 320);
if (p.x <= 240 && p.y <= 320 && p.x >= 0 && p.y >= 0) {
if (released) {
touched = true;
released = false;
}
}
else {
//Serial.println("Touch me where I like it!");
touched = false;
released = true;
}
if (touched && !released) {
Serial.println("don't touch me!");
drawButton(100, 100, "Manuell");
touched = false;
delay(500);
}
}
我注意到 TFT 显示屏和触摸屏共享一些模拟引脚。我认为这是造成问题的原因。 因此,我将代码分为处理触摸屏的部分。然后我可以将引脚重新分配给 TFT 显示器并对其进行绘制。我不知道这个理论是否有意义,但它确实有效:
void loop() {
//Touchposition bestimmen
if (ts.isTouching()) {
Point p = ts.getPoint();
p.x = map(p.x, TS_MINX, TS_MAXX, 0, 240);
p.y = map(p.x, TS_MINY, TS_MAXY, 0, 320);
if (released) {
released = false;
}
}
else {
//Serial.println("Touch me where I like it!");
released = true;
}
if (ts.isTouching() && !released) {
//re assing pins to tft because they are also used by the touchscreen
Adafruit_TFTLCD tft(LCD_CS, LCD_CD, LCD_WR, LCD_RD, LCD_RESET);
Serial.println("don't touch me!");
drawButton(100, 100, "Manuell");
touched = false;
}
}
drawButton funton 包含多个绘制函数