71 lines
2.7 KiB
Markdown
71 lines
2.7 KiB
Markdown
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# External resources
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Since InfiniTime 1.11 apps and watchfaces can benefit from the external flash memory to store images and fonts.
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This external memory is a lot bigger (4MB) than the internal memory that contains the firmware (512KB).
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This page describes how the resources are integrated in InfiniTime from a developer perspective. [This page](gettingStarted/updating-software.md) explains how to install and update the external resources using companion apps.
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## Resources generation
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Resources are generated at build time via the [CMake target `Generate Resources`](https://github.com/InfiniTimeOrg/InfiniTime/blob/develop/src/resources/CMakeLists.txt#L19).
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It runs 3 Python scripts that respectively convert the fonts to binary format, convert the images to binary format and package everything in a .zip file.
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The resulting file `infinitime-resources-x.y.z.zip` contains the images and fonts converted in binary `.bin` files and a JSON file `resources.json`.
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Companion apps use this file to upload the files to the watch.
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```
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{
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"resources": [
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{
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"filename": "lv_font_dots_40.bin",
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"path": "/fonts/lv_font_dots_40.bin"
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}
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],
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"obsolete_files": [
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{
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"path": "/example-of-obsolete-file.bin",
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"since": "1.11.0"
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}
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]
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}
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```
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The resource JSON file describes an array of resources and an array of obsolete files :
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- `resources` : a resource is a file that must be flashed to the watch
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- `filename`: name of the resources in the zip file.
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- `path` : file path and name where the file must be flashed in the watch FS.
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- `obsolete_files` : files that are not needed anymore in the memory of the watch that can be deleted during the update procedure.
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- `path` : path of the file in the watch FS
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- `since` : version of InfiniTime that made this file obsolete.
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## Resources update procedure
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The update procedure is based on the [BLE FS API](BLEFS.md). The companion app simply write the binary files to the watch FS using information from the file `resources.json`.
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## Working with external resources in the code
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Load a picture from the external resources:
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```
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lv_obj_t* logo = lv_img_create(lv_scr_act(), nullptr);
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lv_img_set_src(logo, "F:/images/logo.bin");
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```
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Load a font from the external resources: you first need to check that the file actually exists. LVGL will crash when trying to open a font that doesn't exist.
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```
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lv_font_t* font_teko = nullptr;
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if (filesystem.FileOpen(&f, "/fonts/font.bin", LFS_O_RDONLY) >= 0) {
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filesystem.FileClose(&f);
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font_teko = lv_font_load("F:/fonts/font.bin");
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}
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if(font != nullptr) {
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lv_obj_set_style_local_text_font(label, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, font);
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}
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```
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