firmware from scratch

[garyStofer]

l ported the freecut firmware to newer cake machine. It has a different PIC than the one free cut was originally written for, but the io and the rest of the electronic where pretty much the same, except for the LCD display. I'm planning on adding code for a graphtec interface,so it can be used to cut from PDF. gary

[gossiphog]

wow, very cool!! I have not made any progress on mine since I ran into
trouble finding a Serial library that supports software flow control.

I implemented support for a cutter protocol that Make the Cut supports,
have you done anything like this, or are you still using the "one command
at a time" method of Freecut?

regards
David

On Sat, Jan 11, 2014 at 11:53 AM, garyStofer notifications@github.comwrote:

l ported the freecut firmware to newer cake machine. It has a different
PIC than the one free cut was originally written for, but the io and the
rest of the electronic where pretty much the same, except for the LCD
display. I'm planning on adding code for a graphtec interface,so it can be
used to cut from PDF. gary

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/3
.

[markawilliamson]

I know this is a year old, but either one of you still toying with these cricut machines? I have added HPGL support to the original freecut but need to talk to someone who has walked these roads for some q&a

[Arlet]

I haven't done anything on this for years, but I'll be happy to help with questions if I can.

[garyStofer]

Thanks for the replies guys!

When porting the stuff to the cake machine I noticed that the LCD on it was of an very different kind. I ended up removing the original LCD and replacing it with a standard 4x40 module, then I got busy with an other project....

I have a Silhouette machine that I use to cut SMD solder stencils with. I want to use the Cricut machine to cut gasket material since it's a much stronger machine mechanical. So my plan is still to make its interface like what the Silhouette has (graphtec).

To thetazzbot : I'd be interested in looking at and possibly incorporating your HPGL code !

Thanks

Gary

[markawilliamson]

Yeah, well I just figured out that Arlet had a Cricut Personal and some
how I missed that detail, and have been attempting to port the firmware to
the Cricut expression with not much success.

I'm working on the timer code and will have to carefully look at all the
other code (Especially the LCD code) to make sure it will function.

The ATMega1281 in the Expression Mk1 is a different beast than the 128...

I'm glad there are still some kindling flames of interest in these
machines. They are great lab machines to learn AVR development.

On Thu, Jan 29, 2015 at 10:53 AM, garyStofer notifications@github.com
wrote:

Thanks for the replies guys!

When porting the stuff to the cake machine I noticed that the LCD on it
was of an very different kind. I ended up removing the original LCD and
replacing it with a standard 4x40 module, then I got busy with an other
project....

I have a Silhouette machine that I use to cut SMD solder stencils with. I
want to use the Cricut machine to cut gasket material since it's a much
stronger machine mechanical. So my plan is still to make its interface like
what the Silhouette has (graphtec).

To thetazzbot : I'd be interested in looking at and possibly incorporating
your HPGL code !

Thanks

Gary

—
Reply to this email directly or view it on GitHub
#3 (comment).

[garyStofer]

@thetazzbot

Yes the cake machine also has the ATmega1281. But I just noticed that I didn't make a fork on this project yet. I will add that as soon as I can figure out where I checked it in a year ago. Ha !

[markawilliamson]

Arlet,

I've got only one small issue that I haven't identified. I've got the HPGL parser working, serial with xon/xoff, keyboard, etc, all works. No display yet but that's a different problem.

Current problem is the pen. I can't get it to issue any pressure. I can "hear"/"Feel" it clicking like it is going down or trying to but nothing after that. I tied a keypad button to "pen_down" so I could test it over and over, so I can definately feel it clicking, but no pressure.

When you wrote the original code, how did you go about debugging when the PWM didnt seem to be functioning?

I haven't changed this code:

// set timer 1, WGM mode 7, fast PWM 10 bit
// PWM, Phase Correct, 10-bit
//Clear OCnA/OCnB/OCnC on compare match, set OCnA/OCnB/OCnC at BOTTOM (non-inverting mode)
DDRB |= (1 << 6); // PB6 is PWM output
//DDRE |= (1 << 2); // PEN OUTPUT
TCCR1A = (1 << WGM11) | (1 << WGM10) | (1 << COM1B1);
TCCR1B = (1 << WGM12) | 1;
OCR1B = MAX_PEN_PRESSURE; // lowest pressure

// Timer 3, WGM mode 15 (1111), Fast PWM using OCR3A 
TCCR3A = (1 << COM3A0) | (1 << WGM31) | (1 << WGM30);
TCCR3B = (1 << WGM33) | (1 << WGM32) | 1;   

I have verified to the best of my knowlede that PE2 and PB6 are correct. One being the control transistor that turns on/off the power transistor. I attached my meter to the output on the power transister and when i press the "pen down" button, the voltage changes only briefly then goes back to nominal. So it feels like the timer1 is not staying on long enough....

Any advice would be appreciated

[Arlet]

timer1 should stay on all the time. It's not related to the pen up/down mechanism. You could try turning PB6 into a regular GPIO output, and set it manually for maximum pressure, and then check the outputs with a voltmeter.

[TrendMend]

I know this is years old, but I am having trouble flashing any cricut firmware, and I was wondering if anyone experienced the same issue. So I try to flash the cricut when it is on using my avr pocket programmer and avrdude, but everytime, the microcontroller restarts and avrdude errors out. any ideas?

[garyStofer]

No problems like that here. Cheeked the obvious already ? broken wire, bad VCC, etc ? Gary From: TrendMend Sent: Monday, February 18, 2019 6:10 PM To: Arlet/Freecut Cc: Gary Stofer ; Author Subject: Re: [Arlet/Freecut] firmware from scratch (#3) I know this is years old, but I am having trouble flashing any cricut firmware, and I was wondering if anyone experienced the same issue. So I try to flash the cricut when it is on using my avr pocket programmer and avrdude, but everytime, the microcontroller restarts and avrdude errors out. any ideas? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

[TrendMend]

not that I know of, I was thinking it was contacting the microcontroller to quickly, but that wasn't the case. I am going to try another programming cable.

[TrendMend]

@garyStofer I was wondering how you reprogram the cricut, do you use the isp port? and do you reprogram it when it is on, when there is nothing connected to it? etc. Thanks

[garyStofer]

I think I used the JTAG interface. I modified the port where the cartridge plugged in so that I can directly plug in my JTAG-ICE. The unit must be powered of course, USB doesn't matter since it is just a USB to UART device. I have the "cake" machine, it had a slightly different micro in it, but basically the same. I'm using it often ...I might have some notes on the jtag hookup that I never put up on GIT, but I'm not home right now.

…

On Feb 19, 2019, at 10:00 AM, TrendMend ***@***.***> wrote: @garyStofer I was wondering how you reprogram the cricut, do you use the isp port? and do you reprogram it when it is on, when there is nothing connected to it? etc. Thanks — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

[MrTev]

@garyStofer I'm about to try to get this to work on a Cake Mini. Do I need to use the version of FreeExpression on your page or will the Tazzbot's version also work?

[garyStofer]

Hey, For the Cake machine you need the FreeExpression version from my github page. Arlet’s machine had a different CPU and LCD. Also you will need a different LCD for the CAKE machine then what came with the machine. I used a 4x40 “standard LCD” display with a spi interface. See the Read.me and the file hacknotes.pdf under the src folder. I also added a simple G-code interface so I could cut from simple CNC files as well. Not tested much and the G-code implementation is not complete but it does the simple things I needed it to do. Great machine, I’m using it to cut gaskets and other thick material. Have fun making it go ! Gary From: MrTev Sent: Friday, March 01, 2019 9:22 PM To: Arlet/Freecut Cc: Gary Stofer ; Mention Subject: Re: [Arlet/Freecut] firmware from scratch (#3) @garyStofer I'm about to try to get this to work on a Cake Mini. Do I need to use the version of FreeExpression on your page or will the Tazzbot's version also work? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.