QR code

QR code generation with LVGL. Uses QR-Code-generator by nayuki.

Usage

Enable LV_USE_QRCODE in lv_conf.h.

Use lv_qrcode_create() to create a qrcode object, and use lv_qrcode_update() to generate a QR code.

If you need to re-modify the size and color, use lv_qrcode_set_size() and lv_qrcode_set_dark / light_color(), and call lv_qrcode_update() again to regenerate the QR code.

Notes

• QR codes with less data are smaller, but they scaled by an integer number to best fit to the given size.

Example

Create a QR Code

C code  

 View on GitHub

#include "../../lv_examples.h"
#if LV_USE_QRCODE && LV_BUILD_EXAMPLES

/**
 * Create a QR Code
 */
void lv_example_qrcode_1(void)
{
    lv_color_t bg_color = lv_palette_lighten(LV_PALETTE_LIGHT_BLUE, 5);
    lv_color_t fg_color = lv_palette_darken(LV_PALETTE_BLUE, 4);

    lv_obj_t * qr = lv_qrcode_create(lv_screen_active());
    lv_qrcode_set_size(qr, 150);
    lv_qrcode_set_dark_color(qr, fg_color);
    lv_qrcode_set_light_color(qr, bg_color);

    /*Set data*/
    const char * data = "https://lvgl.io";
    lv_qrcode_update(qr, data, strlen(data));
    lv_obj_center(qr);

    /*Add a border with bg_color*/
    lv_obj_set_style_border_color(qr, bg_color, 0);
    lv_obj_set_style_border_width(qr, 5, 0);
}

#endif

MicroPython code  

 View on GitHub MicroPython Simulator

#!/opt/bin/lv_micropython -i
import lvgl as lv
import display_driver

bg_color = lv.palette_lighten(lv.PALETTE.LIGHT_BLUE, 5)
fg_color = lv.palette_darken(lv.PALETTE.BLUE, 4)

qr = lv.qrcode(lv.screen_active())
qr.set_size(150)
qr.set_dark_color(fg_color)
qr.set_light_color(bg_color)

# Set data
data = "https://lvgl.io"
qr.update(data,len(data))
qr.center()

# Add a border with bg_color
qr.set_style_border_color(bg_color, 0)
qr.set_style_border_width(5, 0)

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API

qrcodegen.h