QRCode on ILI9341 TFT Touch Display

A tutorial on display QRCode using ILI9341 2.4 inch SPI TFT LCD colour screen module (i. e Pixel resolution: 240 x 320).

Jan 20, 2022

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Components and supplies

Arduino UNO

ILI9341

Apps and platforms

Arduino IDE

ricmoo/QRCode Library

LCDWIKI Library

Project description

Code

qrcode_ILI9341.ino

arduino

1#include <LCDWIKI_GUI.h> //Core graphics library
2#include <LCDWIKI_SPI.h>  //Hardware-specific library
3#include "qrcode.h"
4
5//paramters define
6#define  MODEL ILI9341
7#define CS    A5    
8#define CD    A3
9#define RST   A4
10#define  MOSI  11
11#define MISO  12
12#define SCK   13
13#define LED   A0   //if you  don't need to control the LED pin,you should set it to -1 and set it to 3.3V
14
15//the  definiens of software spi mode as follow:
16//if the IC model is known or the modules  is unreadable,you can use this constructed function
17LCDWIKI_SPI mylcd(MODEL,CS,CD,MISO,MOSI,RST,SCK,LED);  //model,cs,dc,miso,mosi,reset,sck,led
18//if the IC model is not known and the  modules is readable,you can use this constructed function
19//LCDWIKI_SPI mylcd(240,320,CS,CD,MISO,MOSI,RST,SCK,LED);  //width,height,cs,dc,miso,mosi,reset,sck,led
20
21//define some colour values
22#define  BLACK   0x0000
23#define BLUE    0x001F
24#define RED     0xF800
25#define  GREEN   0x07E0
26#define CYAN    0x07FF
27#define MAGENTA 0xF81F
28#define YELLOW  0xFFE0
29#define WHITE   0xFFFF
30
31int16_t xaxis=0, yaxis=0, w, h;
32
33void  setup() {
34  Serial.begin(9600);
35  mylcd.Init_LCD();
36  w = mylcd.Get_Display_Width();
37  h = mylcd.Get_Display_Height();
38  xaxis = w/2;
39  yaxis = h/2;
40  mylcd.Set_Text_Mode(0);
41}
42
43void  loop() {
44  mylcd.Fill_Screen(BLACK);
45  generateQRCode();
46}
47
48void  generateQRCode() {
49  // Create the QR code
50    QRCode qrcode;
51    String  amount = "https://youtu.be/jDbdt7-aDDE";
52    uint32_t str_len = amount.length()  + 1;
53    char am[str_len];
54    amount.toCharArray(am, str_len);
55    char  *data = am;
56    
57    const uint8_t ecc = 0;  //lowest level of error correction
58    const uint8_t version = 3;
59
60    uint8_t qrcodeData[qrcode_getBufferSize(version)];
61    qrcode_initText(&qrcode, 
62                    qrcodeData, 
63                    version,  ecc, 
64                    data);
65    const int xy_scale = 6;
66    int xmax  = w/2;
67    int ymax = h/2;
68    int offset = (xy_scale*qrcode.size);
69    int  x1 = xmax - (offset/2);
70    int y1 = ymax - (offset/2);
71
72    int px1 =  x1;
73    int py1 = x1;
74    int px2 = px1;
75    int py2 = py1;
76    
77//    // Top quiet zone
78    for (uint8_t y = 0; y < qrcode.size; y++) {
79        for  (uint8_t x = 0; x < qrcode.size; x++) {
80            bool mod = qrcode_getModule(&qrcode,  x, y);
81            px1 = x1 + x * xy_scale;
82            py1 = x1 + y * xy_scale;
83            px2 = px1 + xy_scale;
84            py2 = py1 + xy_scale;
85            if(mod){   
86              mylcd.Set_Draw_color(CYAN);   
87              mylcd.Fill_Rectangle(px1,  py1, px2, py2);
88            }
89        }
90    }
91    
92}
93

#include <LCDWIKI_GUI.h> //Core graphics library
#include <LCDWIKI_SPI.h>  //Hardware-specific library
#include "qrcode.h"

//paramters define
#define  MODEL ILI9341
#define CS    A5    
#define CD    A3
#define RST   A4
#define  MOSI  11
#define MISO  12
#define SCK   13
#define LED   A0   //if you  don't need to control the LED pin,you should set it to -1 and set it to 3.3V

//the  definiens of software spi mode as follow:
//if the IC model is known or the modules  is unreadable,you can use this constructed function
LCDWIKI_SPI mylcd(MODEL,CS,CD,MISO,MOSI,RST,SCK,LED);  //model,cs,dc,miso,mosi,reset,sck,led
//if the IC model is not known and the  modules is readable,you can use this constructed function
//LCDWIKI_SPI mylcd(240,320,CS,CD,MISO,MOSI,RST,SCK,LED);  //width,height,cs,dc,miso,mosi,reset,sck,led

//define some colour values
#define  BLACK   0x0000
#define BLUE    0x001F
#define RED     0xF800
#define  GREEN   0x07E0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW  0xFFE0
#define WHITE   0xFFFF

int16_t xaxis=0, yaxis=0, w, h;

void  setup() {
  Serial.begin(9600);
  mylcd.Init_LCD();
  w = mylcd.Get_Display_Width();
  h = mylcd.Get_Display_Height();
  xaxis = w/2;
  yaxis = h/2;
  mylcd.Set_Text_Mode(0);
}

void  loop() {
  mylcd.Fill_Screen(BLACK);
  generateQRCode();
}

void  generateQRCode() {
  // Create the QR code
    QRCode qrcode;
    String  amount = "https://youtu.be/jDbdt7-aDDE";
    uint32_t str_len = amount.length()  + 1;
    char am[str_len];
    amount.toCharArray(am, str_len);
    char  *data = am;
    
    const uint8_t ecc = 0;  //lowest level of error correction
    const uint8_t version = 3;

    uint8_t qrcodeData[qrcode_getBufferSize(version)];
    qrcode_initText(&qrcode, 
                    qrcodeData, 
                    version,  ecc, 
                    data);
    const int xy_scale = 6;
    int xmax  = w/2;
    int ymax = h/2;
    int offset = (xy_scale*qrcode.size);
    int  x1 = xmax - (offset/2);
    int y1 = ymax - (offset/2);

    int px1 =  x1;
    int py1 = x1;
    int px2 = px1;
    int py2 = py1;
    
//    // Top quiet zone
    for (uint8_t y = 0; y < qrcode.size; y++) {
        for  (uint8_t x = 0; x < qrcode.size; x++) {
            bool mod = qrcode_getModule(&qrcode,  x, y);
            px1 = x1 + x * xy_scale;
            py1 = x1 + y * xy_scale;
            px2 = px1 + xy_scale;
            py2 = py1 + xy_scale;
            if(mod){   
              mylcd.Set_Draw_color(CYAN);   
              mylcd.Fill_Rectangle(px1,  py1, px2, py2);
            }
        }
    }
    
}

qrcode_ILI9341.ino

arduino

1#include <LCDWIKI_GUI.h> //Core graphics library
2#include <LCDWIKI_SPI.h>   //Hardware-specific library
3#include "qrcode.h"
4
5//paramters define
6#define   MODEL ILI9341
7#define CS    A5    
8#define CD    A3
9#define RST   A4
10#define   MOSI  11
11#define MISO  12
12#define SCK   13
13#define LED   A0   //if you   don't need to control the LED pin,you should set it to -1 and set it to 3.3V
14
15//the   definiens of software spi mode as follow:
16//if the IC model is known or the modules   is unreadable,you can use this constructed function
17LCDWIKI_SPI mylcd(MODEL,CS,CD,MISO,MOSI,RST,SCK,LED);   //model,cs,dc,miso,mosi,reset,sck,led
18//if the IC model is not known and the   modules is readable,you can use this constructed function
19//LCDWIKI_SPI mylcd(240,320,CS,CD,MISO,MOSI,RST,SCK,LED);   //width,height,cs,dc,miso,mosi,reset,sck,led
20
21//define some colour values
22#define   BLACK   0x0000
23#define BLUE    0x001F
24#define RED     0xF800
25#define   GREEN   0x07E0
26#define CYAN    0x07FF
27#define MAGENTA 0xF81F
28#define YELLOW   0xFFE0
29#define WHITE   0xFFFF
30
31int16_t xaxis=0, yaxis=0, w, h;
32
33void   setup() {
34  Serial.begin(9600);
35  mylcd.Init_LCD();
36  w = mylcd.Get_Display_Width();
37   h = mylcd.Get_Display_Height();
38  xaxis = w/2;
39  yaxis = h/2;
40  mylcd.Set_Text_Mode(0);
41}
42
43void   loop() {
44  mylcd.Fill_Screen(BLACK);
45  generateQRCode();
46}
47
48void   generateQRCode() {
49  // Create the QR code
50    QRCode qrcode;
51    String   amount = "https://youtu.be/jDbdt7-aDDE";
52    uint32_t str_len = amount.length()   + 1;
53    char am[str_len];
54    amount.toCharArray(am, str_len);
55    char   *data = am;
56    
57    const uint8_t ecc = 0;  //lowest level of error correction
58     const uint8_t version = 3;
59
60    uint8_t qrcodeData[qrcode_getBufferSize(version)];
61     qrcode_initText(&qrcode, 
62                    qrcodeData, 
63                    version,   ecc, 
64                    data);
65    const int xy_scale = 6;
66    int xmax   = w/2;
67    int ymax = h/2;
68    int offset = (xy_scale*qrcode.size);
69    int   x1 = xmax - (offset/2);
70    int y1 = ymax - (offset/2);
71
72    int px1 =   x1;
73    int py1 = x1;
74    int px2 = px1;
75    int py2 = py1;
76    
77//     // Top quiet zone
78    for (uint8_t y = 0; y < qrcode.size; y++) {
79        for   (uint8_t x = 0; x < qrcode.size; x++) {
80            bool mod = qrcode_getModule(&qrcode,   x, y);
81            px1 = x1 + x * xy_scale;
82            py1 = x1 + y * xy_scale;
83             px2 = px1 + xy_scale;
84            py2 = py1 + xy_scale;
85            if(mod){    
86              mylcd.Set_Draw_color(CYAN);   
87              mylcd.Fill_Rectangle(px1,   py1, px2, py2);
88            }
89        }
90    }
91    
92}
93

#include <LCDWIKI_GUI.h> //Core graphics library
#include <LCDWIKI_SPI.h>   //Hardware-specific library
#include "qrcode.h"

//paramters define
#define   MODEL ILI9341
#define CS    A5    
#define CD    A3
#define RST   A4
#define   MOSI  11
#define MISO  12
#define SCK   13
#define LED   A0   //if you   don't need to control the LED pin,you should set it to -1 and set it to 3.3V

//the   definiens of software spi mode as follow:
//if the IC model is known or the modules   is unreadable,you can use this constructed function
LCDWIKI_SPI mylcd(MODEL,CS,CD,MISO,MOSI,RST,SCK,LED);   //model,cs,dc,miso,mosi,reset,sck,led
//if the IC model is not known and the   modules is readable,you can use this constructed function
//LCDWIKI_SPI mylcd(240,320,CS,CD,MISO,MOSI,RST,SCK,LED);   //width,height,cs,dc,miso,mosi,reset,sck,led

//define some colour values
#define   BLACK   0x0000
#define BLUE    0x001F
#define RED     0xF800
#define   GREEN   0x07E0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW   0xFFE0
#define WHITE   0xFFFF

int16_t xaxis=0, yaxis=0, w, h;

void   setup() {
  Serial.begin(9600);
  mylcd.Init_LCD();
  w = mylcd.Get_Display_Width();
   h = mylcd.Get_Display_Height();
  xaxis = w/2;
  yaxis = h/2;
  mylcd.Set_Text_Mode(0);
}

void   loop() {
  mylcd.Fill_Screen(BLACK);
  generateQRCode();
}

void   generateQRCode() {
  // Create the QR code
    QRCode qrcode;
    String   amount = "https://youtu.be/jDbdt7-aDDE";
    uint32_t str_len = amount.length()   + 1;
    char am[str_len];
    amount.toCharArray(am, str_len);
    char   *data = am;
    
    const uint8_t ecc = 0;  //lowest level of error correction
     const uint8_t version = 3;

    uint8_t qrcodeData[qrcode_getBufferSize(version)];
     qrcode_initText(&qrcode, 
                    qrcodeData, 
                    version,   ecc, 
                    data);
    const int xy_scale = 6;
    int xmax   = w/2;
    int ymax = h/2;
    int offset = (xy_scale*qrcode.size);
    int   x1 = xmax - (offset/2);
    int y1 = ymax - (offset/2);

    int px1 =   x1;
    int py1 = x1;
    int px2 = px1;
    int py2 = py1;
    
//     // Top quiet zone
    for (uint8_t y = 0; y < qrcode.size; y++) {
        for   (uint8_t x = 0; x < qrcode.size; x++) {
            bool mod = qrcode_getModule(&qrcode,   x, y);
            px1 = x1 + x * xy_scale;
            py1 = x1 + y * xy_scale;
             px2 = px1 + xy_scale;
            py2 = py1 + xy_scale;
            if(mod){    
              mylcd.Set_Draw_color(CYAN);   
              mylcd.Fill_Rectangle(px1,   py1, px2, py2);
            }
        }
    }
    
}

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