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What are the specifications of the STM32 chipset and EEPROM? The F3 chip indicated in the QMK firmware says it's an F3, but that comes with varying amounts of ram and flash. I don't know where to start to find the EEPROM stats, since there's no PCB reference and I have no idea how to find it on the board.

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audreyality
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Dec 14, 2024
After a bit of digging I was able to find the EEPROM stats. It uses a 24LC256 2-wire eprom if I read the code correctly. The chip has 32k memory and supports 1 million self-timed write cycles. It's still unclear what the chip proper supports, but self-compiling the firmware reveals the binary is ~80kb. Cross referencing that with the ST spec page for STM32F303, it's clear the chip must have at least 128kb of internal flash and, therefore, at least 40kb SRAM.
audreyality
0
Dec 13, 2024
By the way, I absolutely adore my ALT and just picked up a CTRL. I got the boards set up how I want them, and am now digging into the firmware so I can customize the lighting and share a few keymaps between them. I doubt I'll run into any limits, but it's nice to know what they are so I can set my expectations accordingly. :)
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