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here are a few changes to the spec's list and a very rough picture of what I'm planning for the body
I do plan on releasing the PCB and case designs as open-source once I get closer to finalizing them.
For what it's worth I've been working on an STM32H7-based design using external SDRAM, also targeting an iPod 6g-like form factor. These are the specs:STM32H743 @ 480 MHz
I'm planning on a 320x240 LCD over SPI, which is maybe not ideal
Compared to speachy's wishlist I am missing a few things (UHS-I, OTG, separate line-out port, 60 FPS display) but they aren't showstoppers and could probably be added in a future revision. Only UHS-I is really a pain, because then you need a level shifter + 1.8v supply on the board, and most of my parts require 3.3v.
Quote from: amachronic on June 22, 2024, 12:33:35 PMI do plan on releasing the PCB and case designs as open-source once I get closer to finalizing them.Sounds very interesting!Do you plan do some sort of batch of assembled devices too? I would be happy to support that.
Quote from: amachronic on June 22, 2024, 12:33:35 PMFor what it's worth I've been working on an STM32H7-based design using external SDRAM, also targeting an iPod 6g-like form factor. These are the specs:STM32H743 @ 480 MHzSweeeeeet. FWIW I am particularly fond of the STM32 family, and that has only grown the more I've had to deal with the competition....Quote from: amachronic on June 22, 2024, 12:33:35 PMI'm planning on a 320x240 LCD over SPI, which is maybe not idealGiven the STM32's DMA engine(s), we could probably just have it on a continual (double-buffered) refresh cycle. At 320x240x16bpp, 25MHz 1-bit SPI would net us about 20fps. If we can get 2 or 4-bit SPI that ought to scale nearly linearly. Quote from: amachronic on June 22, 2024, 12:33:35 PMCompared to speachy's wishlist I am missing a few things (UHS-I, OTG, separate line-out port, 60 FPS display) but they aren't showstoppers and could probably be added in a future revision. Only UHS-I is really a pain, because then you need a level shifter + 1.8v supply on the board, and most of my parts require 3.3v.Yeah, no 1.8v supply does hurt. What do you intend to do for power/battery management? (And not having UHS-1 won't really be visible except when doing file transfers...)I look forward to seeing what you come up with!
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