# PNG decode

## Overview

PNG decoding example project demonstrates how to decode a PNG file using LODEPNG software PNG library.

## Board Setting

- Connect the **USB disk** to the development board ``usb0``, or insert the **SD memory card** into the development board ``SD card``
- Connect **LCD screen** to development board

## Configuration

- File `CMakeLists.txt`.
  - ``set (PNG_USE_SDCARD 1)`` to read png file (.png) from SD card or ``set (PNG_USE_UDISK 1)`` to read png file (.png) from u-disk. These options are exclusive.

## Supported picture formats

- Supports standard PNG images

## Image size supported by this routine

- png file size is expected to be less than 1MB

## Running the example

- Configure storage in CMakeLists.txt, default is PNG_USE_SDCARD.
- Put png files (with .png) into target storage
- Connect LCD pannel and storage to board
- Power on the board
- Download built elf into development board and run the demo
- If everything goes well, jpeg files stored in the target storage will be show on LCD pannel one by one.