picodvi
pico-extras
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picodvi | pico-extras | |
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30 | 6 | |
195 | 436 | |
- | 4.4% | |
0.0 | 2.6 | |
over 3 years ago | about 1 month ago | |
C | C | |
BSD 3-clause "New" or "Revised" License | BSD 3-clause "New" or "Revised" License |
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picodvi
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FuryGpu – Custom PCIe FPGA GPU
The RP2040 is a great MCU for playing with graphics as it can bit bang VGA and DVI/HDMI. There's some info on the DVI here: https://github.com/Wren6991/PicoDVI
I wrote a couple of articles on how to do bit banged VGA on the RP2040 from scratch: https://gregchadwick.co.uk/blog/playing-with-the-pico-pt5/ and https://gregchadwick.co.uk/blog/playing-with-the-pico-pt6/ plus an intro to PIO https://gregchadwick.co.uk/blog/playing-with-the-pico-pt4/
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Video Game Module for Flipper Zero
A few years back someone was bit banging DVI and 720p 30fps video straight off the RP2040 GPIO pins with just inline resistors between not and the HDMI cable.
https://github.com/Wren6991/PicoDVI
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VGA driver using PIO and DMA on the RP2040
I have the Adafruit DVI board and have been hacking on it some. It's more fun than should be allowed.
There's a project to get this running using Rust[1]. Currently it outputs the blue channel with sync, but has trouble with the other two channels. I don't have a hardware lab with scope, logic analyzer, etc., so it's not easy for me to debug.
In the meantime, I've been doing some experiments in the C codebase as well[2], mostly in the direction of proportionally spaced bitmap text, using the fonts in the X11 distribution.
[1]: https://github.com/DusterTheFirst/pico-dvi-rs
[2]: https://github.com/Wren6991/PicoDVI/pull/48
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Recommend MCU with dual USB - one host and one device IF?
There is even bit-banged DVI library for pico.
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Show HN: PicoVGA Library – VGA/TV Display on Raspberry Pi Pico
Apparently, there is a digital video output project for the RP2040 already out there [0]! As for why digital video is more rare, it is because the common digital video formats are higher bandwidth and require higher signal integrity.
[0] https://github.com/Wren6991/PicoDVI
- Fast algorithm to scale a image
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Least resourceful 18 year old air defense ukrainian soldier with basic coding abilities
I've seen people implement DVI with PIO, and I'm sure basic missile commands wouldn't be as bandwidth-intensive as that.
- Is a Raspberry Pi Pico able to play video on a spi-tft screen?
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Help understanding current-mode and TMDS logic in DIV/HDMI.
For example this guy (https://github.com/Wren6991/PicoDVI) essentially 'bit bangs' CML. Sure its not a completely compliant implementation, but it's pretty close... In his case using a push pull with 3.3V/0V. I don't know how he's getting a 0.8V swing.
- Bitbanged DVI on the RP2040 Microcontroller
pico-extras
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Raspberry Pico C: Remote Sensor
In the Pico Extras repository, find the external/pico_extras_import.cmake file
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VGA driver using PIO and DMA on the RP2040
[2] https://github.com/raspberrypi/pico-extras/tree/master/src/c...
- External Quad SPI pins?
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i2s
pico-extras
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SD/MMC reading/writing with C SDK
There is https://github.com/raspberrypi/pico-extras/tree/master/src/rp2_common/pico_sd_card which is SDIO based, and works for reading/writing sectors, but very bare bones prototype atm.
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A Closer Look at Raspberry Pi RP2040 Programmable iOS (PIO)
I've just been getting to grips with the PIO, they are a lot of fun to program. Whilst the instruction set is very limited with only enough memory for 32 of them you can do some pretty sophisticated things. A key part of the flexibility is the ability to execute incoming data as instructions. You can stream in a mixture of data and instructions via the DMA, the PIO separates the two and uses the instructions to modify execution so a simple loop becomes a lot more flexible. You can easily sync several of them up to. The scanvideo library: https://github.com/raspberrypi/pico-extras/blob/master/src/c... which is for producing video signals (like VGA) on the fly with scanlines supplied by the CPU is a good example of what's possible. You can have multiple scanline PIO running at once, each decoding a compressed RLE format including transparency and it composes them all together on the fly.
If you've ever played one of the Zachtronics games (in particular Shenzhen IO) it feels like the programming in one of those games. Tight constraints but major possibilities when you think about it for a while.
What are some alternatives?
pico-examples
no-OS-FatFS-SD-SPI-RPi-Pico - A FAT filesystem with SPI driver for SD card on Raspberry Pi Pico
pico-sdk
rpi - Microcontroller projects (RPi, Arduino, ATTiny85, ESP, Pico, STM8/32)
Gert-VGA-666 - Resources for Gert VGA 666
esp-idf - Espressif IoT Development Framework. Official development framework for Espressif SoCs.
showmewebcam - Raspberry Pi + High Quality Camera = High-quality USB Webcam!
Arduino_STM32 - Arduino STM32. Hardware files to support STM32 boards, on Arduino IDE 1.8.x including LeafLabs Maple and other generic STM32F103 and STM32F407 boards.
pico-dvi-rs - Rust reimplementation of PicoDVI for the rp2040 microcontroller
pico-zxspectrum - ZX Spectrum for Raspberry Pico Pi RP2040
Arduino_STM32 - Arduino STM32. Hardware files to support STM32 boards, on Arduino IDE 1.8.x including LeafLabs Maple and other generic STM32F103 boards