Configuring Marlin for a 328 Everything so far has been relatively straight forward, until I got to re-defining the pin outs for my 328 set up. I use analog 2,3 as digital outs for my extruder step/dir, but I use digital 2,3 as my X step/dir. In the pins.h file, there does not appear to be a way to differentiate between the analog and digital pins. Am I missing something, or is there no way to use the analog pins as digital outs in this firmware? https://reprap.org/forum/read.php?147,99765,99765#msg-99765 Mon, 12 Oct 2026 03:02:31 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?147,99765,122208#msg-122208 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,122208#msg-122208 github.com] for grbl

grbl on its own does nothing for compensation of e (the timer variable in stepper.c of merlin)

on another note here is marlin that sort of fits into 328. it fits but the ram used is nearly everything. i can get it to init thru the serial com in arduino ide, but the pronterface host does not see it. Marlin does report free ram at start up so that should help troubleshooting. if anyone wants to play with the code it is here. [www.useablesoftware.com]

with all that said. the 328 version does not compensate for e either, it is disabled to allow it to fit without the eprom table,

so that being said it is waiting for someone who can free up ram and give it a try.


I'm off to do other things now...


just to note the acceleration and path profile are located in planner.c planner.h in grbl and is called from stepper.c]]> jamesdanielv Firmware - experimental, borrowed, and future Sun, 04 Mar 2012 09:19:07 -0500 https://reprap.org/forum/read.php?147,99765,122184#msg-122184 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,122184#msg-122184 Traumflug Firmware - experimental, borrowed, and future Sun, 04 Mar 2012 07:05:16 -0500 https://reprap.org/forum/read.php?147,99765,122154#msg-122154 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,122154#msg-122154 phord Firmware - experimental, borrowed, and future Sat, 03 Mar 2012 23:14:39 -0500 https://reprap.org/forum/read.php?147,99765,122141#msg-122141 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,122141#msg-122141
[github.com]]]> Sublime Firmware - experimental, borrowed, and future Sat, 03 Mar 2012 20:16:32 -0500 https://reprap.org/forum/read.php?147,99765,121922#msg-121922 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,121922#msg-121922 github.com]]]> Traumflug Firmware - experimental, borrowed, and future Fri, 02 Mar 2012 12:46:54 -0500 https://reprap.org/forum/read.php?147,99765,121896#msg-121896 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,121896#msg-121896
most mcodes above 115 except bed temp commands are not essential, so they are disabled with 328, also some strings that report at start up and the eeprom check when firmware initializes are disabled as well. eeprom is a separate memory, but the code is taxing to read and write it.

for example you wont be able to add a remote camera to take snap shots anymore if using 328... bummer.

some of the cautionary temp controls such as max and min temps are disabled, but may be enabled carefully based upon flash space available.


next is to find approximate but close fits for the acceleration tables that are in epprom, not using those tables along with the above, and some minor code changing allows the code now to take 30350 bytes. however i still need to create a simplified table, and continue finding ways to save space . also i have disabled pid, but will enable it if it fits when modifications are complete. with 8mhz arduino flash i have 30720 bytes to program with. also sd is disabled currently]]> jamesdanielv Firmware - experimental, borrowed, and future Fri, 02 Mar 2012 10:49:07 -0500 https://reprap.org/forum/read.php?147,99765,121768#msg-121768 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,121768#msg-121768 jamesdanielv Firmware - experimental, borrowed, and future Thu, 01 Mar 2012 11:59:27 -0500 https://reprap.org/forum/read.php?147,99765,121606#msg-121606 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,121606#msg-121606
lol!]]> AphoticJezter Firmware - experimental, borrowed, and future Wed, 29 Feb 2012 15:58:47 -0500 https://reprap.org/forum/read.php?147,99765,121511#msg-121511 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,121511#msg-121511 Traumflug Firmware - experimental, borrowed, and future Wed, 29 Feb 2012 06:21:00 -0500 https://reprap.org/forum/read.php?147,99765,121491#msg-121491 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,121491#msg-121491 jamesdanielv Firmware - experimental, borrowed, and future Wed, 29 Feb 2012 04:35:30 -0500 https://reprap.org/forum/read.php?147,99765,121327#msg-121327 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,121327#msg-121327
if I don't do updates in two weeks with it working on 328, then consider it a failure. I will then go back to sprinter with sd support. but i would rather marlin work on 328, even nearly crippled for the prusa i'm building below.




I have enough pins to also run lcd support, but i think marlin has that built in..
]]> jamesdanielv Firmware - experimental, borrowed, and future Tue, 28 Feb 2012 03:23:53 -0500 https://reprap.org/forum/read.php?147,99765,119817#msg-119817 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,119817#msg-119817 Andrew Diehl Firmware - experimental, borrowed, and future Mon, 20 Feb 2012 01:01:22 -0500 https://reprap.org/forum/read.php?147,99765,119807#msg-119807 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,119807#msg-119807 Cosmic1953 Firmware - experimental, borrowed, and future Sun, 19 Feb 2012 23:07:20 -0500 https://reprap.org/forum/read.php?147,99765,117259#msg-117259 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,117259#msg-117259 I'm interested in getting Marlin working on a 328p, and am having a lot of issues.]]> lincomatic2 Firmware - experimental, borrowed, and future Sat, 04 Feb 2012 18:38:47 -0500 https://reprap.org/forum/read.php?147,99765,100160#msg-100160 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,100160#msg-100160 Andrew Diehl Firmware - experimental, borrowed, and future Wed, 05 Oct 2011 14:52:16 -0400 https://reprap.org/forum/read.php?147,99765,100158#msg-100158 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,100158#msg-100158 jv4779 Firmware - experimental, borrowed, and future Wed, 05 Oct 2011 14:47:19 -0400 https://reprap.org/forum/read.php?147,99765,100068#msg-100068 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,100068#msg-100068
Erik has got it to the point where I can jog it through pronterface without issue. I've even run some files through it with some success. Yes, it does still freeze up after a bit, but I don't think it is all that far from working properly.

JV4779, He's actually been moving parts of it into flash to free up more ram, so there may be more hope than you think]]> Andrew Diehl Firmware - experimental, borrowed, and future Tue, 04 Oct 2011 21:33:19 -0400 https://reprap.org/forum/read.php?147,99765,99876#msg-99876 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,99876#msg-99876 jv4779 Firmware - experimental, borrowed, and future Mon, 03 Oct 2011 09:50:32 -0400 https://reprap.org/forum/read.php?147,99765,99837#msg-99837 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,99837#msg-99837 dank.bengler.no]]]> Sublime Firmware - experimental, borrowed, and future Mon, 03 Oct 2011 01:14:59 -0400 https://reprap.org/forum/read.php?147,99765,99822#msg-99822 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,99822#msg-99822 Andrew Diehl Firmware - experimental, borrowed, and future Sun, 02 Oct 2011 21:06:53 -0400 https://reprap.org/forum/read.php?147,99765,99818#msg-99818 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,99818#msg-99818 jv4779 Firmware - experimental, borrowed, and future Sun, 02 Oct 2011 20:29:07 -0400 https://reprap.org/forum/read.php?147,99765,99792#msg-99792 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,99792#msg-99792 Andrew Diehl Firmware - experimental, borrowed, and future Sun, 02 Oct 2011 17:36:19 -0400 https://reprap.org/forum/read.php?147,99765,99770#msg-99770 Re: Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,99770#msg-99770 Sublime Firmware - experimental, borrowed, and future Sun, 02 Oct 2011 16:42:08 -0400 https://reprap.org/forum/read.php?147,99765,99765#msg-99765 Configuring Marlin for a 328 https://reprap.org/forum/read.php?147,99765,99765#msg-99765
I use analog 2,3 as digital outs for my extruder step/dir, but I use digital 2,3 as my X step/dir.

In the pins.h file, there does not appear to be a way to differentiate between the analog and digital pins. Am I missing something, or is there no way to use the analog pins as digital outs in this firmware?]]> Andrew Diehl Firmware - experimental, borrowed, and future Sun, 02 Oct 2011 15:58:43 -0400