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40 lines
2.4 KiB
40 lines
2.4 KiB
10 months ago
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MicroModemGP
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==========
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MicroModemGP is a general purpose firmware for [MicroModem](http://unsigned.io/micromodem).
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It supports both KISS mode serial connections, and direct serial connection without framing for easy communication with anything with a serial port.
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You can buy a complete modem from [my shop](http://unsigned.io/shop), or you can build one yourself pretty easily. Take a look at the documentation in the [MicroModem](https://github.com/markqvist/MicroModem) repository for information and getting started guides!
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## Some features
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- Easily send and receive packets over mostly any radio
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- Full modulation and demodulation in software
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- Flexibility in how received packets are output over serial connection
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- Can run with open squelch
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- Supports KISS mode for use with programs on a host computer
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- 12,8 Hamming-code forward error correction and 12-byte interleaving
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- CRC checksum on packets ensure data integrity
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- Supports packets with up to 564 bytes of data
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## Serial connection settings
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By default, the modem uses __9600 baud, 8N1__ serial. The baudrate can be modified in the "device.h" file.
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## KISS mode or direct serial framing
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You can configure whether to use KISS serial framing or direct serial framing in the "config.h" file.
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When the modem is running in KISS mode, there's really not much more to it than connecting the modem to a computer, opening whatever program you want to use with it, and off you go.
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You can also configure the modem in direct serial framing mode. If using direct serial framing, the firmware uses time-sensitive input, which means that it will buffer serial data as it comes in, and when it has received no data for a few milliseconds, it will start sending whatever it has received.
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If you're manually typing things to the modem from a terminal, you should therefore set your serial terminal program to not send data for every keystroke, but only on new-line, or pressing send or whatever. You can also compile the firmware for KISS mode serial connection, if you have a host program using KISS. If you are using MicroModemGP with [Reticulum](https://github.com/markqvist/Reticulum), use KISS.
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## Other notes
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The project has been implemented in your normal C with makefile style, and uses AVR Libc. The firmware is compatible with Arduino-based products, although it was not written in the Arduino IDE.
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Visit [my site](http://unsigned.io) for questions, comments and other details.
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