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Thomas Göttgens 2022-11-02 10:34:51 +01:00 committed by GitHub
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14
docs/developers/Firmware/radio-settings.mdx
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@ -61,13 +61,13 @@ We have six predefined channels. These are the most common settings and have bee
| Channel setting | Alt Channel Name | Data-rate | SF / Symbols | Coding Rate | Bandwidth | Link Budget |
| :------------------ | :--------------- | :------------------ | :----------- | :---------- | :-------- | :---------- |
| Short Range / Fast | Short Fast | 18.89 kbps | 7 / 128 | 4/5 | 500 | 134dB |
| Short Range / Slow | Short Slow | 4.69 kbps | 7 / 128 | 4/5 | 125 | 140dB |
| Medium Range / Fast | Medium Fast | 1.2 kbps | 10 / 1024 | 4/6 | 250 | 146dB |
| Medium Range / Slow | Medium Slow | 0.75 kbps | 11 / 2048 | 4/7 | 250 | 148dB |
| Long Range / Fast | Long Fast | 0.19 kbps (default) | 9 / 512 | 4/8 | 31 | 153dB |
| Long Range / Slow | Long Slow | 0.13 kbps | 12 / 4096 | 4/8 | 125 | 154dB |
| Very Long Range - Slow | Very Long Slow | 0.04 kbps | 12 / 4096 | 4/8 | 31.25 | ???dB |
| Short Range / Fast | Short Fast | 6.8 kbps | 7 / 128 | 4/8 | 250 | 137dB |
| Short Range / Slow | Short Slow | 3.9 kbps | 8 / 256 | 4/8 | 250 | 140dB |
| Medium Range / Fast | Medium Fast | 2.2 kbps | 9 / 512 | 4/8 | 250 | 143dB |
| Medium Range / Slow | Medium Slow | 1.2 kbps | 10 / 1024 | 4/8 | 250 | 146dB |
| Long Range / Fast | Long Fast | 0.67 kbps (default) | 11 / 2048 | 4/8 | 250 | 148.5dB |
| Long Range / Slow | Long Slow | 0.18 kbps | 12 / 4096 | 4/8 | 125 | 154dB |
| Very Long Range - Slow | Very Long Slow | 0.05 kbps | 12 / 4096 | 4/8 | 31.25 | 160.1dB |
Note: The link budget used by these calculations assumes a transmit power of 17dBm and an antenna with 0dB gain. Adjust your link budget assumptions based on your actual devices. Data-rate in this table is actual measured but doesn't count mesh overhead, hops and retransmissions.

12
docs/getting-started/flashing-firmware/nrf52/drag-n-drop.mdx
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@ -22,4 +22,14 @@ Download and unzip the latest frimware from [Meshtastic Downloads](https://mesht
4. Open this drive and you should see three files: `CURRENT.UF2`, `INDEX.HTM`, and `INFO_UF2.TXT`
5. Drop the appropriate appropriate `firmware-DEVICE_NAME-vx.x.x-xxxxxxx.uf2` file from the release you want to install onto this drive
Once the file has finished copying onto the drive, the device will reboot and install the Meshtastic firmware.
Once the file has finished copying onto the drive, the device will reboot and install the Meshtastic firmware.
:::caution
If you're upgrading your NRF52 device from a previous version of Meshtastic rather than starting from scratch, you may need to do a full factory reset of the internal flash memory. Stale data saved by previous versions of the Meshtastic firmware can cause devices to get stuck in a crash loop at startup.
:::
Meshtastic uses the [littlefs](https://github.com/littlefs-project/littlefs) library to store configuration, logs, and other data in the internal flash of NRF52 devices. Updating the firmware does _not_ erase this additional data, which can cause issues when the format and location of data changes between releases.
To reset the flash storage on your NRF52 board, first follow steps 1-4 above. At step 5, copy the included file named `Meshtastic_nRF52_factory_erase.uf2` onto the virtual disk device instead of a `firmware-DEVICE_NAME...` binary. After the device resets, connect to it via serial console using the [Meshtastic CLI `--noproto`](/docs/software/python/cli/#--noproto) mode or a standalone serial client like `minicom`. When you connect to the serial console, press any key; you should see the message `Formating ... Done`.
Once the flash is erased you can use steps 2-5 above to re-install the latest Meshtastic firmware on a clean storage filesystem.