5 Dec 2024

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TODO V2

Create symbol for my RP2040 board (sandpit/pcb/kicad/RP2040/rp2040_pcba_test) showing its IOs, buttons/headers and LEDs
Create schematic for GFMPW-1 hookup inc. RP2040 and TinyVGA
Write "game" code for PC control of GFMPW-1, also TT07
Write RP2040 (uPython or C) code to move "smartly" between random map locations as a cooler demo
Design/simulate opamp & VGA connector board for TT06, later TT08
Update rbz repo with WB extensions, and improve register access instantiation
Document rbz_options
Document CI2409 RBZ
Document CI2411 RBZ variants, esp. WB
Test other GFMPW-1 designs
GFMPW-1 clocked by RP2040 -- try different clock speeds
Unexpected SPI overloading behaviour; doesn't stall SPI counter as it should?
- Compare reg SPI (over)load: https://github.com/algofoogle/algofoogle-multi-caravel/blob/gf180/verilog/rtl/raybox-zero-fsm/src/rtl/spi_registers.v
- Compare vec SPI (over)load
- Compare versions (TT04 and CI2311 work OK with both overloading??? Or maybe the don't: MicroPython SoftSPI maybe sends exact bits? Don't think so).
- Try a GFMPW vec SPI regular load, vs. overload
- Do a simulation of SPI loading & check VCD
Document TT08 submission for analog review
Try to get TT09 ring osc extraction/simulation to work

Simulate devices that have usable SPICE models (e.g. from TI) -- Create warpper SPICE as required for multi-devices.
Generate high-impedance 0-1.8V analog signal from AD3:
- Waveform gen:
  - Without BNC: -3dB at 9MHz
  - With BNC: -3db at 12MHz
- Run it thru a 100k (or 1Meg) resistor?

(floor(X*32)%3<2) * (
  (floor(X*256) % 2) * sin(2*PI*X)/2 + X
)

Simulated opamp delay is about 10ns on rising edge:

...much faster on falling edge.