The SARK-DIGI is an open source project to design a stand-alone digital modem with a color display, intended to be coupled to a QRP transceiver either based on a traditional architecture or SDR technology such as the SoftRock, to form a compact and portable station for working the digital modes.
This project will be based on the powerful STM32 F4 microcontroller (Cortex-M4) and I will initially prototype it on the STM32F4 Discovery board connected to the rest of the necessary hardware through the board expansion connector.
I don’t have yet clear the plans but the idea will be that it will be developed a compact board to be integrated by the user into his QRP transceiver, and maybe I’ll work in offering an enclosure for it. Besides I will provide the necessary information to allow building the device using the STM32F4 Discovery board and maybe other board that could be available with this processor (e.g. in case of availability of STM32-Mini format of boards based on the STM32 F4)
Besides, the plan is that this project will evolve to a second project that will be a standalone SDR transceiver, the SARK-SDR.
I have started the project with a mockup running on the PC. This mockup will run essentially the same code as the target device with the exception of the critical code that will be optimized for the target. The objective of this first mockup is having tested and confirmed the suitability of the user interface which is critical for the usability of this type of device.