76 lines
3.2 KiB
Markdown
76 lines
3.2 KiB
Markdown
[![CC BY-NC-SA 4.0][cc-by-nc-sa-shield]][cc-by-nc-sa]
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# LinHT-hw
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Open-source hardware, Linux-based, SDR handheld transceiver. [OpenHT](https://github.com/M17-Project/OpenHT-hw) successor with greatly simplified hardware - no FPGAs involved.
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This project offers a replacement board for the Retevis C62 radio, greatly expanding its capabilities.
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## Hardware
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The device uses an [MCM-iMX93](https://www.compulab.com/products/computer-on-modules/mcm-imx93-nxp-i-mx-93-som-smd-system-on-module) System on Module (SoM) running Linux. The RF front-end is based on the [Semtech SX1255](https://www.semtech.com/products/wireless-rf/lora-core/sx1255). The chip is used as a complete IQ modulator/demodulator, allowing for true all-mode support.
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### Resources
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**CPU:**
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* Dual-core ARM Cortex-A55 @ 1.7GHz
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* ARM Cortex-M33 coprocessor @ 250MHz
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* Floating Point Unit
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* ARM Ethos U-65 microNPU (Neural Processing Unit with TensorFlow Lite support)
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**Memory:**
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* 2GB LPDDR4
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* 32GB eMMC
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**RF:**
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* 500kHz bandwidth complete IQ transceiver
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## Software
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Developers can use C/C++/Python as well as (or in conjunction with) GNU Radio flowgraphs. Tools such as gcc are built-in.
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### Supported modes (so far):
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* FM transmission and reception with pre-/de-emphasis and CTCSS,
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* SSB transmission and reception,
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* M17 - transmission and reception,
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* TETRA - reception only,
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* Demo 64QAM transmission at 2Mbps
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Other modes can be added later (FreeDV, APRS, etc.).
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## Images
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### Download images
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Prebuilt images for LinHT can be downloaded [here](https://m17project.org/linht/).
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### Building images
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Instructions for setting up the Yocto build environment can be found in the [M17 Wiki](https://wiki.m17foundation.org/index.php?title=LinHT_Image_Build).
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All layers required to build the image are located in the M17 Project GitHub:
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- [meta-linht-hardware](https://github.com/M17-Project/meta-linht-hardware): Provides machine configuration and hardware support for the LinHT hardware.
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- [meta-linht-software](https://github.com/M17-Project/meta-linht-software): Provides application software, libraries, and system configuration.
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- [meta-linht-sdr](https://github.com/M17-Project/meta-linht-sdr): A modified version of [meta-sdr](https://github.com/balister/meta-sdr), providing the GNU Radio package.
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### Flashing
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To flash the images to LinHT the [Universal Update Utility](https://github.com/nxp-imx/mfgtools/releases) is needed.
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LinHT needs to be booted into flash mode (holding the secondary side button while booting).
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Once in flash mode, the image can be written with uuu:
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```bash
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uuu -v -b emmc_all imx-boot-mcm-imx93-sd.bin-flash_singleboot linht-image-mcm-imx93.rootfs.wic.zst
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```
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## Driver
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To access LinHTs network device under windows, [RNDIS driver](https://www.catalog.update.microsoft.com/Search.aspx?q=USB%20RNDIS%20Gadget) need to be installed.
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## License
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This work is licensed under a
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[Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License][cc-by-nc-sa].
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[![CC BY-NC-SA 4.0][cc-by-nc-sa-image]][cc-by-nc-sa]
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[cc-by-nc-sa]: http://creativecommons.org/licenses/by-nc-sa/4.0/
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[cc-by-nc-sa-image]: https://licensebuttons.net/l/by-nc-sa/4.0/88x31.png
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[cc-by-nc-sa-shield]: https://img.shields.io/badge/License-CC%20BY--NC--SA%204.0-lightgrey.svg
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