Search found 9 matches

by RetroZvoc
Tue Jun 04, 2019 12:00 pm
Forum: Hardware
Topic: Driving an 8-bit parallel 8080 bus using I2S
Replies: 25
Views: 10133

Re: Driving an 8-bit parallel 8080 bus using I2S

I've already tried the GPIO w1ts/w1tc byte permutation trick with a lookup table that some YouTuber made and it's not really fast. It goes up to 38FPS and the tearing is very significant and ugly. It also doesn't utilize DMA, but it's all just bitbanging. I don't think that assembly would help ther...
by RetroZvoc
Mon Jun 03, 2019 5:40 am
Forum: Hardware
Topic: Driving an 8-bit parallel 8080 bus using I2S
Replies: 25
Views: 10133

Re: Driving an 8-bit parallel 8080 bus using I2S

I heard on some hacker forums Bituni simple ripped that code off of someone else's project. Not sure but this code looks a bit sloppy and it is heavy mixed with Arduino. If you look at I2S technical reference info there are a lot of functionalities that are untouched by most of the code out there. ...
by RetroZvoc
Sun Jun 02, 2019 11:48 pm
Forum: Hardware
Topic: Driving an 8-bit parallel 8080 bus using I2S
Replies: 25
Views: 10133

Re: Driving an 8-bit parallel 8080 bus using I2S

Alright. So, I saw there was a library written by bitluni for VGA where bitluni achieved 580MHz of speed! However, unfortunately for me, unlike for all of other codes, this one he licensed under a ShareAlike license! I wonder if it's somehow possible to do a clean-room implementation (to avoid the l...
by RetroZvoc
Sat May 04, 2019 10:47 pm
Forum: Hardware
Topic: ESP32 with USB battery charger & USB virtual CD + HID serial port
Replies: 0
Views: 940

ESP32 with USB battery charger & USB virtual CD + HID serial port

I'm looking for an ESP32 board with a USB port that can be used to charge a Li-Po battery while operating the board. The key feature I need is a USB chip that can convert ESP32's USART communication into a HID serial port while providing a virtual CD with a virtual filesystem containing a minimalist...
by RetroZvoc
Sun Feb 17, 2019 12:25 am
Forum: Hardware
Topic: How do I get started with setting up I2S and DMA for my ILI9341 display?
Replies: 0
Views: 981

How do I get started with setting up I2S and DMA for my ILI9341 display?

Hello. I've been looking for a microcontroller fast enough to drive a display without tearing at full 60fps which is also able to run a game engine without having to wait for VBlank. ESP32 has been the best choice. As Bitluni was working on his VGA demo for ESP32 and found out some out of specs I2S ...
by RetroZvoc
Sat Feb 16, 2019 11:47 pm
Forum: ESP32 Arduino
Topic: How do I set CPU speed of NODEMCU ESP32-S to 240MHz in Arduino IDE?
Replies: 2
Views: 10320

How do I set CPU speed of NODEMCU ESP32-S to 240MHz in Arduino IDE?

There are many boards which have an option for setting the CPU frequency. However, mine which is NODEMCU ESP32-S doesn't. Am I missing on something? Should I set the speed inside of the Arduino sketch?
by RetroZvoc
Wed Jan 16, 2019 1:37 am
Forum: ESP-IDF
Topic: LCD SPI & I2S - Serial & Parallel - Speed vs Ressources
Replies: 6
Views: 6189

Re: LCD SPI & I2S - Serial & Parallel - Speed vs Ressources

FYI, if you use the esp-idf SPI driver, the transfer should be done entirely in DMA, freeing up the CPU to do other tasks. We're aware of the 4K limitation in that driver, and I expect a MR that amongst others fixes this limitation to come through within a few days. Wrt 8-bit LCD mode: there used t...
by RetroZvoc
Tue Nov 27, 2018 5:17 am
Forum: General Discussion
Topic: New to ESP32. Which one should I buy for my specified needs?
Replies: 5
Views: 3229

Re: New to ESP32. Which one should I buy for my specified needs?

Suggest you look at odroid go and m5stack I've seen M5stack and it sounds promising. However, the equipment is very expensive and I'm not sure if it would work out. Odroid looks very good and it is well done, but I'm concerned regarding legality. Odroid has an Android logo which I'm not sure if it ...
by RetroZvoc
Tue Nov 27, 2018 2:17 am
Forum: General Discussion
Topic: New to ESP32. Which one should I buy for my specified needs?
Replies: 5
Views: 3229

New to ESP32. Which one should I buy for my specified needs?

Hello. I've been programming AVR XMEGA and AVR MEGA microcontrollers, but I didn't like some things about them. I've always wanted to make my own alternative to a Sony Ericsson K510i/C510/2705 phone which would have things like a file manager, music player, paint program, programmable apps, etc.. Th...

Go to advanced search