No image displayed when testing

[eduardo-carletti]

Hello, I am trying to test the library as suggested by the example, but it only shows "NO DATA" in my display. My hardware is a 128x64 dot monochrome, and its working fine with others objects (images and labels). Are the instructions "lv_qrcode_create" and "lv_qrcode_update" all that is needed to display the QR Code?

[eduardo-carletti]

Hello, I am trying to test the library as suggested by the example, but it only shows "NO DATA" in my display. My hardware is a 128x64 dot monochrome, and its working fine with others objects (images and labels). Are the instructions "lv_qrcode_create" and "lv_qrcode_update" all that is needed to display the QR Code?

The "NO DATA" message was due a image object that was created but not filled. In fact, the QR Code component is not generating any data on display.

[kisvegabor]

Hi,

I tested with the example in the README and it worked well for me.

Please be sure to update lvgl and QR code lin to the latest version from master.

[Pupil2013]

/* 1: Enable indexed (palette) images */
#define LV_IMG_CF_INDEXED       1

Enable this will fix it

[Pupil2013]

The qr lib use canvas and img widgets,the canvas use the indexed color

[Zheckiss]

I'm using ESP-IDF and ported lib of qrcode. After callling lv_qrcode_update(qr, data, strlen(data)); application rebooted probably due to memory violation. Guru Meditation Error: Core 0 panic'ed (LoadProhibited). Exception was unhandled.

[kisvegabor]

What happens if you increase LV_MEM_SIZE?

[Zheckiss]

I have updated the lvgl from esp board manufacturer and error is gone.