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AP_OSD: add SD-card handling to font README

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basti 2021-02-05 07:47:50 +01:00 committed by Peter Barker
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libraries/AP_OSD/fonts/README.md
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@ -40,3 +40,8 @@ in your cloned repository and call:
./mcm2bin.py yourfont.mcm fontN.bin
```
to convert existent or added charsets into a binary. Now navigate back to the directory root, configure and build for your desired board.
## SD-card based font handling ##
Support for SD-card based font handling has been added with firmware version 4.1 and later. This adds the option to choose from up to 10 font files (named "font0.bin" - "font9.bin") placed in the root directory of your SD card. It allows to save memory especially on 1 MB boards by removing font binaries from the main firmware binary. Additionally, this allows the user to easily add individualized and/or customized language charsets for the onboard OSD without the need to compile individual firmware. Runtime font changing using the parameter :ref:`OSD_FONT<OSD_FONT>` is unaffected. MAVftp might be a convenient option to upload files to your SD card without having to physically remove it from your flight controller.