JTAG Interface

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.

Microcontroller Peripheral Connections

Universal Serial Communication Interfaces (USCIs):

A - Supporting up to four total of UART and/or SPI
- A0 [SPI]:
  - CANbus Controller 0 (Microchip Technology MCP2515T-I/SO)
  - CANbus Controller 1 (Microchip Technology MCP2515T-I/SO)
- A1:
- A2 [UART]:
  - RS-232 Transceiver (STMicroelectronics ST232CDR)
- A3 [UART]:
  - USB to UART Bridge (Future Technology Devices International FT230XS-R)
B - Supporting up to four total of I2C and/or SPI
- B0 [SPI]:
  - SD Card
  - GPS Receiver (Maxim Integrated ‎MAX2771ETI+T)
- B1 [SPI]:
  - Bluetooth/Wi-Fi (Espressif Systems ESP32-WROVER-IE (8MB))
- B2 [I2C]:
  - Inertial Measurement Unit (TDK InvenSense ICM-20600)
  - Real-Time Clock/Calendar (Microchip Technology ‎MCP7940MT-I/SN)

The thinking behind this so far, is to try and balance the load between the modules with SPI protocol being used in more high data-rate peripherals and I2C used with lower or less-used peripherals.