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_color() or
lv_qrcode_set_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
#include <string.h>
/**
* 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