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82 lines
3.4 KiB
Markdown
82 lines
3.4 KiB
Markdown
# oresat-c3
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## General information
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This is the C3 (Command, Communication, and Control) card for OreSat. It acts as the central control point for the entire OreSat project, provides
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telemetry to the ground, and receiver commands. It's the "on board computer" (OBC) of the OreSat bus. It has:
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- Octavo OSD335x-SM SIP AM335X-based Cortex A8 Microporcessor
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- On Semi AX5043-based L Band (1.265 GHz) receiver
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- On Semi AX5043-based UHF Band (436.5 MHz) receiver and transmitter with 1W PA.
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- Custom radiation tolerant watchdog timer based on the TI TLV1042 comparator.
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- 16 GB eMMC flash data storage
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- 1 Mbit of FRAM for high reliability state and variable storage
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- Supercapacitor-backed up RTC
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- Two antenna deployment circuits
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- OreSat Power Domain (OPD) control circuitry
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Design materials are on Google docs; we'll post links / PDFs soon.
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Bill of Materials (BOM) can be found [here](https://docs.google.com/spreadsheets/d/11vG1kWyrAjmbF5QJM-EhXmvQoF6O47japwYlHF802do/edit#gid=1239769296).
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## OreSat C3 version 6 (KiCAD)
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Fixes for the radio receivers, version 2 backplane pinout, and lots of little tweaks
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after our lessons learned on OreSat0. OH, and a COMPLETE REFACTOR since we switched from
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the STM32F439 to an Octavo OSD335x-SM and switched from EAGLE to KICAD. Yikes.
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### V6 Software
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The C3 runs Python code that interacts with the radios, peripherals, and CAN bus. [Here's more information](https://github.com/oresat/oresat-c3-software).
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## OreSat C3 version 5 (EAGLE)
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C3 V5 flew on Oresat0, Oregon's first satellite! Everything worked great, except for the
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radio receivers (L band LNA oscillated, and UHF LNA was turned off in firmware).
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### v5 Firmware
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The firmware for the C3 card is written in C and runs on top of ChibiOS, a small RTOS.
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It is integrated into the [oresat-firmware](https://github.com/oresat/oresat-firmware) repository.
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The firmware application for this project is located
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[here](https://github.com/oresat/oresat-firmware/tree/c3_capstone/src/f4/app_c3_v1).
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## OreSat C3 version 4 (EAGLE)
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C3 V4 is our latest version of the C3 card; it's getting ready for flight in
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Q2 2021 in OreSat0. It's got all of the functionality necessary for flight.
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## OreSat C3 V3 (2019-2020 ECE Capstone)
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The 2018-2019 ECE Capstone brought the card to version 3. It implements an
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STM32F446VET6 IC, the full L band receiver with ultistage LNA, and a UHF radio
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with LNA but no PA for transmitting.
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## Breadboard Prototype
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Most embedded project starts out as a bunch of development boards strung together;
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the C3 is no different! The breadboard prototype for the C3 card implements an
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STM32F446RE development board connected to two SPI radios, the OreSat
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FlatSat backplane via a CAN transceiver and I2C for the OPD interface,
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and a SDIO and SPI connected SD/MMC Card. The breadboard implements
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stronger pullups for the I2C lines than the GPIO of the STM32 can
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provide. It is currently capable of interfacing with and activating the
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OPD connected boards.
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## License
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All materials in this repo are copyright Portland State Aerospace Society and are licensed under the CERN Open Hardware Licence Version 2 -
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Strongly Reciprocal (CERN-OHL-S v2), or any later version. A copy of the license is located in [here](LICENSE.md).
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