sorear changed the topic of #riscv to: RISC-V instruction set architecture | https://riscv.org | Logs: https://libera.irclog.whitequark.org/riscv
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<solrize> re longan board, hmm ok nice, is that the one with the built in display that seeed was selling?
<solrize> hmm i have a fast vibration sensor switch in my adafruit cart. i must have wanted it for something, but what?
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<muurkha> yeah
<solrize> cool
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<solrize> gd32vf in a tiny package as a 50 cent part would be a nice attiny replacement...
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<muurkha> that could maybe happen
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<muurkha> I don't think the Bumblebee RISC-V core the GD32VF uses is much bigger than the Cortex-M0 used in the STM32L, maybe smaller even
<muurkha> and there are STM32L chips that are astoundingly small: https://www.digikey.com/en/products/detail/stmicroelectronics/STM32L011E4Y6TR/6166956
<muurkha> but so far AFAIK GD hasn't been trying to compete in that market
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<muurkha> WLCSP25: 2.133 × 2.070 mm, 0.380 mm thick
<muurkha> costs three times what you're saying tho
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<solrize> muurkha, want a small qfn, i.e. not too many pins. wlcsp needs expensive pcb fab as i understand it
<solrize> it is ok if the chip is smaller, like 1/4 of the ram and flash, as an avr replacement
<solrize> alternatively would like to have a bigger one that can cost a little more
<solrize> but considering the esp32c3 is around $1 it is hard to charge a lot for a gd32vf
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<muurkha> solrize: why does a wlcsp need expensive pcb fab?
<muurkha> do you just mean that it requires a lot of vias and a 6-layer or more PCB?
<muurkha> I had the impression that the appeal of the gd32vf was in large part that you have the same peripherals as an STM32F103
<muurkha> just a nicer and cheaper CPU
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<Xark> muurkha: UPduino 3.1 is a nice inexpensive DIP FPGA board for iCE40UP5K (with 128KByte of embedded SPRAM), I am using it in my retro video project. However, not ideal for typical RISC-V SoC, since single channel FTDI only lets you access SPI flash _or_ UART (not both in same design). Minor bummer if you want RISC-V with flash and UART (but can use external FTDI).
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<muurkha> Xark: I think I'm going to see if I can get the iCE40UP5K breakout board instead: https://www.digikey.com/en/products/detail/lattice-semiconductor-corporation/ICE40UP5K-B-EVN/6596291
<muurkha> because Digi-Key doesn't carry UPDuino and I'm asking a friend to buy me the stuff and bring it to me
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<solrize> muurkha, i thought you needed fancy pcb fab to make traces fine enough. also 6 layers is a lot. how many layers does a typical small dev board have?
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<Xark> muurkha: Cool, that is a pretty nice board also (some good examples for it here https://github.com/damdoy/ice40_ultraplus_examples). However, I really don't like how they hooked FTDI to SPI. I find UART more useful (and SPI is a pain on PC side - but it is does have dual channel FTDI, for JTAG). I will also mention UPduino is now available more easily in EU from LectronZ https://lectronz.com/stores/tinyvision-ai-store
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<la_mettrie> smaeul: this toolchain didn't find headers for compiling boot0: make CROSS_COMPILE=riscv64-unknown-elf- p=sun20iw1p1 mm
<la_mettrie> so i had to use instead: make CROSS_COMPILE=riscv64-linux-gnu- p=sun20iw1p1 mmc
<la_mettrie> dunno if this is just my stupid mistake, but i report anyway since README seems to suggest that ELF toolchain can be used (i downloaded it from my x86-debian's repository)
<smaeul> which header is it missing?
<la_mettrie> here's the output https://pastebin.com/raw/hhCVhhwE
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<smaeul> hmm, that might be as simple to fix as `echo "#include <linux/stddef.h>" > include/stddef.h`
<smaeul> as long as your riscv64-unknown-elf-gcc still has a built-in stdint.h
<smaeul> otherwise I'll just update the README :)
<la_mettrie> after that command it starts to complain about stdbool.h instead
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