Adolfo Reyna
f785bd3fb2
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The flashed 0.8.0-dev firmware exports the legacy device_find_by_name / device_find_first_by_type lookup API, not the newer device_get_* out-param API. Switching to device_get_* (to match newer SDK headers) caused 'ELF: Can't find symbol device_get_by_name' at load on .129/.114. Revert to the exported legacy functions, declared locally since the newer SDK header dropped them. Verified on .129 via serial: elf entry resolves, app shows.
Tactility Book Player App
The Book Player app for Tactility OS plays children's books stored on the SD card. Each book is organized in its own subfolder and contains a sequential layout of pages with both visual illustrations (images) and narration (audio).
SD Card Layout
Books must be stored under /sdcard/books/ on the device SD card with the following structure:
/sdcard/books/
book_slug_1/
manifest.json
page001.png
page001.mp3
page002.png
page002.mp3
...
book_slug_2/
manifest.json
page001.jpg
page001.wav
page002.jpg
page002.wav
...
Manifest Format
Each book subfolder must contain a manifest.json file. Here is a sample format:
{
"title": "Princess Grace and Poppy",
"author": "Reyna Family",
"id": "grace-poppy",
"format": "tactility-book-manifest-v1",
"display": {
"width": 320,
"height": 240
},
"audio": {
"encoding": "mp3",
"sample_rate_hz": 16000,
"channels": 1,
"bitrate_kbps": 24
},
"pages": [
{
"image": "page001.png",
"audio": "page001.mp3",
"caption": "Once upon a time, in a magnificent castle perched high on a hill above the sea, there lived five princesses..."
},
{
"image": "page002.png",
"audio": "page002.mp3",
"caption": "This is the story of Princess Grace..."
}
]
}
Content Requirements
- Images: PNG or JPG format. Recommended size is
320×240pixels (or scaled to match standard aspect ratios). - Audio: Mono
MP3or uncompressed standardWAVfiles. For ESP32-S3 systems, lower sampling rates (e.g. 16 kHz mono) are recommended for memory efficiency.