我正在尝试使用Arduino Uno + TFT LCD制作幻灯片。
有三个步骤:
- 显示形状
- 用户触摸屏幕指定区域
- 显示下一张幻灯片
设备可能在幻灯片期间关闭，我想让Arduino记住我们在关闭之前的哪一步，以便它可以从最近的前一个位置开始。
要做到这一点，我正试图使用EEPROM(欢迎任何其他建议)。但是，每次我关闭设备再打开它时，它都会从幻灯片的前一个位置开始，而当我触摸指定区域时，幻灯片不会继续前进。
当我检查串行监视器时，state变量(这是我用来在内存中保存幻灯片进度状态的变量)转回一个巨大的随机数。
这里是串行监视器日志:
s = 0 n = 1 st = 126 X = -9 Y = 217 Pressure = 653
s = 0 n = 1 st = 126 X = -9 Y = 218 Pressure = 565
s = 0 n = 2 st = 127 X = -9 Y = 224 Pressure = 462
s = 0 n = 2 st = 127 X = -9 Y = 225 Pressure = 434
// libraries and and defined variables
#include <EEPROM.h>
#include "Adafruit_GFX.h"
#include "MCUFRIEND_kbv.h"
MCUFRIEND_kbv tft;
int n = 1;
int addr;
bool t = false;
#include "TouchScreen.h"
#define YP A2
#define XM A3
#define YM 8
#define XP 9
int s;
int state ;
TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);
// prepairatio of LCD, there is a check() function for memory though.
void setup(void) {
tft.reset();
Serial.begin(9600);
uint16_t ID = tft.readID();
tft.begin(ID);
tft.setRotation(1);
tft.invertDisplay(true);
tft.fillScreen(0x0000);
check(); //<------- the check function for the memory---
//#FIRST picture on the LCD
tft.fillRect(120, 160, 10, 20, 0x1C12);
}
// void loop
void loop(void) {
// some touch screen prepairations
digitalWrite(13, HIGH);
TSPoint p = ts.getPoint();
digitalWrite(13, LOW);
pinMode(XM, OUTPUT);
pinMode(YP, OUTPUT);
p.x = map(p.x, 150, 920, tft.width(), 0);
p.y = map(p.y, 120, 940, tft.height(), 0);
// first if() condition for the pressure amount needed
if (p.z > 100 || s == 1) { //<----------- "s" variable was used--------
Serial.print("s = "); Serial.print(s);//it will change becuase of state to lead us to last level
Serial.print("tn = "); Serial.print(n);// level of game
Serial.print("tst = "); Serial.print(state);//data to be remembered
Serial.print("tX = "); Serial.print(p.x);//area of touch
Serial.print("tY = "); Serial.print(p.y);//area of touch
Serial.print("tPressure = "); Serial.println(p.z);
// second if() condition for the location of touching
if ((p.y > 217 && p.y < 241 && p.x > -10 && p.x < 2 && n == 1) || s == 1) {//<----------- "s" variable was used--------
tft.fillRect(0, 0, 15, 30, 0xFFE0);
t = !t;
if (t == true) {
n++;
state++; //<----------- state variable increases by each level--------
}
t = !t;
EEPROM.write(0, state);//<----------- state is being written to the memory so that the next time the device is on, it remembers how far it went--------
}
}
if (p.z > 100 || s == 2 ) {//<----------- "s" variable was used--------
if ((p.y > 210 && p.y < 241 && p.x > 8 && p.x < 12 && n == 2) || s == 2) {
tft.fillRect(0, 0, 15, 30, 0xFFE0);
t = !t;
if (t == true) {
n++;
state++;//<----------- state variable increases by each level--------
}
t = !t;
EEPROM.write(0, state);//<----------- state is being written to the memory so that the next time the device is on, it remembers how far it went--------
}
}
}
//checking memory
void check(void) {
state = EEPROM.read(0);//<--- defining state by the number read from the memory-----
if (state == 1) { //<------ if the state being read is 1, then...
s = s + state; //<------ make s also 1. (s here is 0 as defined at the beggining)----
}
if ( state == 2) { //<----------and so on---
s = s + state;
}
}
EEPROM。读取和EEPROM。Write函数作用于字节然而，你的'state'变量是一个int型，它是2个或更多字节，所以只有一部分数据被读写。
尝试使用EEPROM.put()和EEPROM.get()函数。
这些是多态函数(使用c++模板)，因此它们自动检测类型中的字节数，无论您正在写入的变量(可能使用sizeof())，并相应地读取或写入字节数。
还要注意不同的接口。这两个函数通过引用而不是通过值
来读写变量。