camera_round_display_save_jpeg

XIAO Round Display Software Preparation

• First, you need to search and download the latest version TFT_eSPI and LVGL libraries in the Arduino IDE Library Manager.
• The TFT_eSPI library compatible with Round Display has been submitted for a merge request, so when the next version is released, you can search and download TFT_eSPI in Arduino IDE to use it normally. Until then, if you need to use the TFT_eSPI library for Round Display, please download it from: https://github.com/Maxwelltoo/TFT_eSPI
• Then, we also need to download and import the configuration library for Round Display. https://github.com/Seeed-Studio/Seeed_Arduino_RoundDisplay
• Take the lv_conf.h file and place it to the root directory of the Arduino library.
• Comment out the line #include <User_Setup.h> and uncomment the line #include <User_Setups/Setup66_Seeed_XIAO_RoundDisplay.h> in the User_Setup_Select.h file.

Capure of images to save as a Dataset on the SD Card Reader

This code was adapted from the original, developed by Seeed Studio:

• https://wiki.seeedstudio.com/xiao_esp32s3_camera_usage/#project-i-making-a-handheld-camera

Important changes:

• It is not necessary to to cut off J3 on the XIAO ESP32S3 Sense expansion board. It is possible to use the XIAO's SD Card Reader. For that you need use SD_CS_PIN as 21.
• The camera buffer data should be captured as RGB565 (raw image) with a 240x240 frame size to be displayed on the round display. This raw image should be converted to jpeg before save in the SD card. This can be done with the line:
  • esp_err_t ret = frame2jpg(fb, 12, &out_buf, &out_len)
• The XCLK_FREQ_HZ should be reduced from 20KHz to 10KHz in order to prevent the message "no EV-VSYNC-OVF message" that appears on Serial Monitor (probably due the time added for JPEG conversion.

Adapted by MRovai @02June23