45 lines
2.0 KiB
Markdown
45 lines
2.0 KiB
Markdown
@page designChoices Design Choices
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# JTAG Interface
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When connecting the MCU to the programmer via the JTAG interface, it is possible for a local power supply connected to the MCU to be used or for power from the debugging/programming adapter to be used. Since having power supplied to the MCU from the debugging/programming adapter can be useful for use outside of the Sunseeker vehicle, we chose to use that.
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# Microcontroller Connections
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The board is going to be organized to the best of our abilities to be organized as such:
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- Left Side:
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- Peripherals for communicating with/controlling the Sunseeker vehicle
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- Right Side:
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- Peripherals for communicating with users
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#### Universal Serial Communication Interfaces (USCIs):
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- A - Supporting up to four total of UART and/or SPI
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- A0 [SPI]:
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- CANbus Controller 0 (Microchip Technology MCP2515T-I/SO)
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- A1 [SPI]:
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- CANbus Controller 1 (Microchip Technology MCP2515T-I/SO)
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- GPS Receiver (U-Blox NEO-M9N [SparkFun Breakout Board])
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- A2 [UART]:
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- USB to UART Bridge (Future Technology Devices International FT230XS-R)
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- A3 [UART]:
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- RS-232 Transceiver (Maxim Integrated MAX3232EUE+)
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- B - Supporting up to four total of I2C and/or SPI
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- B0 [SPI]:
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- SD Card
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- B1 [I2C]:
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- Inertial Measurement Unit (TDK InvenSense ICM-20948)
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- B2 [I2C]:
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- Real-Time Clock/Calendar (Microchip Technology MCP7940MT-I/SN)
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- B3 [SPI]:
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- Bluetooth/Wi-Fi (Espressif Systems ESP32-WROVER-IE (8MB))
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In addition to trying to keep the MCU and PCB organized with the left-side being to do with the Sunseeker vehicle and the right side to be peripherals interacting with users, we tried to also load-balance the USCI modules, as well as have the SPI protocol be used in more high data-rate peripherals and I2C used with lower or less-used peripherals. In Texas Instruments SLAS655G Document [Page 7] has a pin diagram showing the physical location of where each pin is physically located. |