16:29 <kraiskil> Can anyone point me to a "hello world" example project that uses icestorm & next-pnr? All I can find is yosys/icestorm/arachne-pnr examples.

16:30 <kraiskil> Using next-pnr as a drop-in replacement for arachne-pnr doesn't seem to work even after modifying the command line options - should it? Or should I as end-user just use arachne-pnr for now?

16:34 <daveshah> See https://github.com/cliffordwolf/picorv32/blob/master/picosoc/Makefile#L69

16:34 <tpb> Title: picorv32/Makefile at master · cliffordwolf/picorv32 · GitHub (at github.com)

16:34 <daveshah> nextpnr is not a drop in replacement

16:34 <daveshah> It has a totally different set of options - use --help

16:35 <daveshah> It also needs a JSON file rather than BLIF from Yosys - use synth_ice40 -json rather than -blif

16:39 <tnt> kraiskil: https://github.com/icebreaker-fpga/icebreaker-examples

16:39 <tpb> Title: GitHub - icebreaker-fpga/icebreaker-examples: This repository contains small example designs that can be used with the open source icestorm flow. (at github.com)

16:40 <kraiskil> daveshah, ha - I'd missed that blif vs json thingy. (wait - is this json as in Java script object notation?)

16:40 <daveshah> Yes

16:40 <kraiskil> tnt, thanks :)

16:41 <daveshah> http://www.clifford.at/yosys/cmd_write_json.html

16:41 <tpb> Title: Yosys Open SYnthesis Suite :: Command Reference :: write_json (at www.clifford.at)

16:41 <daveshah> Is the syntax

16:43 <kraiskil> Ok, got past that hurdle :) But seems the .pcf file syntax has changed too? Or do I just have a bad .pcf to start with?

16:46 <tnt> pcf syntax is the same AFAIK

16:46 <tnt> pastebin your pcf ?

16:49 <kraiskil> tnt, https://github.com/tinyfpga/TinyFPGA-BX/blob/master/icestorm_template/pins.pcf

16:49 <tpb> Title: TinyFPGA-BX/pins.pcf at master · tinyfpga/TinyFPGA-BX · GitHub (at github.com)

16:51 <tnt> Looks fine to me, what's the error ?

16:53 <kraiskil> File "pins.pcf", line 41

16:53 <kraiskil> SyntaxError: invalid syntax

16:53 <kraiskil> set_io --warn-no-port PIN_1 A2

16:53 <kraiskil> ^

16:53 <tnt> That ... looks like a python error.

16:54 <daveshah> I think you are missing a --pcf

16:54 <daveshah> --warn-no-port is now deprecated (it's the default, use -nowarn if you don't want a warning at all), but should be ignored happily

17:15 <kraiskil> the next-pnr cmd line is:

17:15 <kraiskil> nextpnr-ice40 --lp8k --package cm81 --pcf pins.pcf pins.pcf top.json

17:15 <kraiskil> eh

17:16 <kraiskil> took me this long to spot the error :D

17:20 <tnt> lol

17:21 <kraiskil> so, the correct next-pnr line is:

17:21 <kraiskil> nextpnr-ice40 --lp8k --package cm81 --pcf pins.pcf top.json --asc top.asc

17:21 <tnt> looks about right

17:21 <daveshah> --json top.json

17:21 <kraiskil> but no "top.asc" is produced?

17:22 <tnt> oh yeah --json

17:22 <kraiskil> hehe - and now a top.asc is produced :p

17:22 <tnt> I'm not even sure why it accepts positional argumentS ?

17:23 <kraiskil> the coolness of a tool is related to its learning curve? :p

17:23 <tnt> well so far it's really just reading the -h output, not exactly rocket science.

17:25 <kraiskil> anyways, I got my .bin now. Next up, find my board and try to flash it :) Thanks all for the help

17:26 <kraiskil> (also, why are there at least three flashing tools for Lattice - not including Lattice's own - out there. Is anyone working on unifying these?)

17:29 <tnt> kraiskil: 3 ?

17:29 <MoeIcenowy> to be honest, I use flashrom for my board ;-)

17:30 <tnt> kraiskil: there is iceprog which is the 'standard' stuff using the ftdi chips connected the same way as the official boards. Then tinyfpga has its own stuff because it has a 'bootloader' thing which is completely specific to tinyfpga.

17:30 <kraiskil> iceprog, iceburn, tinyprog

17:31 <kraiskil> ok, I haven't looked into all this yet :)

17:31 <tnt> Oh yeah, iceburn ... but that one is pretty much the same as iceprog function wise, it doesn't have any advantage other than being python only.

17:48 <kraiskil> heh - tinyprog fails to program the board. Ohwell, this I leave for another time :D