322 Explorer
322 : Explorer
- Author: sylefeb
- Description: none
- GitHub repository
- Open in 3D viewer
- Clock: 33000000 Hz
- Feedback: ✅ 1
How it works
This design performs a 2D 'voxel' raycasting of a terrain, implementing in actual hardware the 1992 Voxel Space algorithm used in the Comanche game.
The chip is designed in Silice, the source code is in the main repo.
How to test
A specific data file containing terrain data has to be uploaded to SPI-ram before this can run. The plan is to do that from the RP2040 of the PCB.
Another way to test is on a IceStick HX1K. Instructions coming soon!
External hardware
- QSPI PSRAM PMOD from machdyne
- 240x320 ST7789V screen
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | Button 0 | QSPI ram, csn (output) | |
| 1 | Button 1 | SPI screen, clock | QSPI ram, io0 (bidir) |
| 2 | Button 2 | SPI screen, csn | QSPI ram, io1 (bidir) |
| 3 | Button 3 | SPI screen, dc | QSPI ram, clock (output) |
| 4 | SPI screen, mosi | QSPI ram, io2 (bidir) | |
| 5 | SPI screen, resn | QSPI ram, io3 (bidir) | |
| 6 | QSPI ram, bank select 0 (output) | ||
| 7 | QSPI ram, bank select 1 (output) |
User feedback
- sylefeb👑: Tested successfully at 17MHz (seems different PSRAM chips support different freqs, start at 1MHz) Link for more details