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Wow thanks, this is definetely something I have to investigate. Maybe the Sipeed Maix SDK provides something similar for the LicheeRV Nano.

I'm currently prototyping a tiny portable audio player[1] which battery life could benefit a lot from this.

1: https://github.com/sandreas/rust-slint-riscv64-musl-demo

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I'd rather have the Linux SOC and a $0.50-$1 FPGA (Renesas ForgeFPGA, Gowin, Efinix, whatever) nearby.
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> $0.50-$1 FPGA

no such thing, 5V tolerant buffers will run you more than that

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The ICE40s start well under $2 even in moderate quantities. They’re 3V3, not 5V0, but for most applications these days that’s an advantage.
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