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DIU-Apple-Notes.md

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DIU Version "Apple" Notes

2020-02-13

This document is a place to discuss version "Apple" of the Driver Interface Unit (DIU) hardware.

This is a "living" document and is subject to updates and changes as work progresses.

Overview

Version "Apple" of the hardware DIU is meant to create a robust version of the DIU using off the shelf components and custom hardware in the form of "hat" for the Raspberry Pi board. One item the "Apple" DIU is attempting to address is to eliminate all USB connections as there is concern that the noisy environment will interfere with the high speed USB connections and cause intermittent issues.

The current version of the DIU uses USB to:

  • Receive touch screen events in the form of a mouse input from the screen
  • Communicate with the PIU over a USB-to-RS232 interface
  • Interface with the FONA clone to receive GPS data

Version "Apple" of the DIU aims to eliminate all these USB connections and replace them by various forms of I2C, SPI or RS232 communication interfaces.

Roadmap

  • Use a 7 inch capacitive touch display that supports mipi-dsi and some form of I2C or SPI for touchscreen events
  • Use a DAC to get sound out of the I2C or PCM line of the Raspberry Pi
  • Create a "hat" to:
    • house the MAX232 (or equivalent) for PIU communication
    • act as a consolidation of I2C, SPI or UART (or other peripheral management) coming in to funnel to the Raspberry Pi
    • house the 5W/15W+ amplifier

TODO

  • Determine if the FONA clone can be powered via a 3.3v power line directly instead of through USB
  • Determine whether GPS data can read from the FONA clone through another interface (SPI, I2C or UART)
  • Create a rough diagram of the "hat" for the Raspberry Pi
  • Research a monitor replacement
    • mipi-dsi input
    • I2C or SPI touch for mouse events
    • 3.3v input
  • Find a suitable 3.3v buck converter
  • Find a solution for sound

References