TheBackShed.com

Forum Index : Microcontroller and PC projects : MM2: 3.2" Colour TFT Touchscreen

Page 2 of 3

Author

Message

WhiteWizzard
Guru

Joined: 05/04/2013
Location: United Kingdom
Posts: 2794

Posted: 10:36pm 27 Jan 2015

Copy link to clipboard

Print this post

Grogs,

Are you planning on using the two 8-bit shift registers too? (as hinted by Peter)

One thing worth including is pwm backlight control . . .

For everything Micromite visit micromite.org

Direct Email: whitewizzard@micromite.o

matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 8604

Posted: 10:37pm 27 Jan 2015

Copy link to clipboard

Print this post

Grogster

Suggest you hold off designing a board for a few days - I might have something interesting to suggest soon

WhiteWizzard
Guru

Joined: 05/04/2013
Location: United Kingdom
Posts: 2794

Posted: 10:37pm 27 Jan 2015

Copy link to clipboard

Print this post

matherp said Grogster

Suggest you hold off designing a board for a few days - I might have something interesting to suggest soon

110"

For everything Micromite visit micromite.org

Direct Email: whitewizzard@micromite.o

Grogster

Admin Group

Joined: 31/12/2012
Location: New Zealand
Posts: 9082

Posted: 10:52pm 27 Jan 2015

Copy link to clipboard

Print this post

matherp said Grogster

Suggest you hold off designing a board for a few days - I might have something interesting to suggest soon

Owwwwwww - peaked my interest. I will hold off till you impress us all again.

Smoke makes things work. When the smoke gets out, it stops!

bigmik

Guru

Joined: 20/06/2011
Location: Australia
Posts: 2870

Posted: 03:21pm 28 Jan 2015

Copy link to clipboard

Print this post

matherp said
Suggest you hold off designing a board for a few days - I might have something interesting to suggest soon

I am starting not to like you anymore MatherP,

I have been buying up all this displays and now you changed you mind..

All in jest of course... Keep up the fantastic work, I feel because of your efforts we are onto something fantastic here.

Regards,

Mick

Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<

Grogster

Admin Group

Joined: 31/12/2012
Location: New Zealand
Posts: 9082

Posted: 03:42pm 28 Jan 2015

Copy link to clipboard

Print this post

He may well be using the display - why re-invent the wheel?
It's just he might be designing his own carrier board in the same way I was thinking of doing.

We'll wait in suspense!!!

Smoke makes things work. When the smoke gets out, it stops!

Oldbitcollector

Senior Member

Joined: 16/05/2014
Location: United States
Posts: 172

Posted: 05:36pm 29 Jan 2015

Copy link to clipboard

Print this post

@matherp

First of all, thank you for all your efforts on this.

I bought one of these displays thinking that it might be compatible. Upon actual inspection, I'm having trouble lining up the I/O with what appears in your code. Does this display appear to be compatible with what you have been working with there? (BTW, these screens are TINY.)

Thanks
jeff

My Propeller/Micromite mini-computer project.

Grogster

Admin Group

Joined: 31/12/2012
Location: New Zealand
Posts: 9082

Posted: 06:00pm 29 Jan 2015

Copy link to clipboard

Print this post

Driver for that display is ILI9341. Is that supported?
Not sure...

If not, then probably not.

Smoke makes things work. When the smoke gets out, it stops!

Oldbitcollector

Senior Member

Joined: 16/05/2014
Location: United States
Posts: 172

Posted: 06:03pm 29 Jan 2015

Copy link to clipboard

Print this post

My mistake!

It should have been posted to his other thread..
http://www.thebackshed.com/forum/forum_posts.asp?TID=7358&PN =1

I'll leave it be for now and see if he reports in.

There is indications that his code does support the chip, I'm just not sure about the interface itself.

thanks
Jeff

My Propeller/Micromite mini-computer project.

TassyJim

Guru

Joined: 07/08/2011
Location: Australia
Posts: 5923

Posted: 07:30pm 29 Jan 2015

Copy link to clipboard

Print this post

You should try the three main chips just in case the advert is not right about which one it uses.
Don't worry about the size until you 'see the light'

The pins for RST, CE and CD(or D/C) are set as constants in the software.
SPI clock (pin 25) goes to CLK and SPI OUT (pin 3) goes to DIN.

For the S6D02A1 chips, I modified Peter's code:
2015-01-30_052926_TFT-S6D02A1-SPI.zip

Jim

VK7JH
MMedit MMBasic Help

matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 8604

Posted: 11:53pm 29 Jan 2015

Copy link to clipboard

Print this post

I've got to the point where I think it is about safe (i.e it should probably end up working!) to reveal what I have been up to

With Geoff's help and agreement I've been porting the Micromite firmware to the PIC32MX470F512 chips - why?

Twice the flash memory and RAM - see the picture

Twice the speed, Currently the maximum is 80Mhz but 96 should be possible if I can sort out some sort of configuration issue.

A full 16-bit data port completely separate from all of the special purpose pins - perfect for driving TFT displays even faster!

The PIC32MX470F512 is available in 2 packages that are useful to us, a 64-pin TQFP and a 100-pin TQFP, the same firmware will support both but it is different from the 28 and 44-pin versions. The 64-pin chip is probably the perfect version for us.

I've mounted the 100-pin version on a spare Colour Maximite PCB as a test-bed. A mono-Maximite PCB or mini-Maximite would be an ideal test-bed for the 64-pin chip. If anyone has a spare of these lying around (or anything else suitable) they would be willing to let me have please PM me.

The pinouts of the 470 chips are exactly the same as the PIC32MX695 chips used in the Maximites but for the avoidance of doubt the 695 chips are much less similar to the 170s and I will not be porting to them!

Once I've done more testing myself I will be asking for volunteers to beta-test the code and if all goes well I'm hoping Geoff will take it over as part of the official Micromite release - hopefully he won't find my code too terrible.

Obviously, the relevance of this to this thread is that the 64-pin version would make the perfect CPU for a display backpack.

The starting point though should probably be a DIL breakout like the ones that have been made for the 44-pin chip.

I've attached the pin-out details for the chips ( equivalent to pages 6 and 7 in the Micromite manual) for information.

The current status is that the chip is up and running as evidenced above. I can load and run programs (including Cfunctions) through MMEDIT and use local edit as normal. The increased CPU speed is definitely effective (6msec for my sort code vs 11 before). I can address all the I/O pins but I haven't yet tested any functionally.

Edited by matherp 2015-01-31

bigmik

Guru

Joined: 20/06/2011
Location: Australia
Posts: 2870

Posted: 12:02am 30 Jan 2015

Copy link to clipboard

Print this post

Peter,

PM me your address and I will send a Mono maximite PCB to you.

Regards,

Mick

PS.

Sounds mouth watering

EDIT***

Damn.!!

Only yesterday I placed an order for some more blank 170's (I even bought some 44 pinners) If I had known I would have bought a few 64pinners to try..

MickEdited by bigmik 2015-01-31

Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<

MicroBlocks

Guru

Joined: 12/05/2012
Location: Thailand
Posts: 2209

Posted: 12:08am 30 Jan 2015

Copy link to clipboard

Print this post

Are you using the PMP for driving the display.
Because Microchips graphics libraries are specifically made for driving graphics screens.

Microblocks. Build with logic.

matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 8604

Posted: 12:35am 30 Jan 2015

Copy link to clipboard

Print this post

Quote Are you using the PMP for driving the display.

Give me a chance

I'm still trying to get the chip working fully - there were a lot of configuration changes needed!

However, it is not my intention to implement any additional functionality into Basic - that is Geoff's prerogative.

My pinout leaves PortB0-15 completely free and it is possible to assign these pins to the PMP although the 64-pin devices only allow 8-bit PMP databus usage.

Driving a 16-bit parallel TFT just using portB from a Cfunction should, allowing for the faster clock speed, run about 4x faster on this chip and it was already pretty quick. The PMP would certainly give additional gains but requires a lot of set up.

WhiteWizzard
Guru

Joined: 05/04/2013
Location: United Kingdom
Posts: 2794

Posted: 12:37am 30 Jan 2015

Copy link to clipboard

Print this post

Yet more exciting stuff to play with.
Can you please confirm which are the 16 consecutive pins as I am reading this on a phone and can't see them in your pin listings!

Also can you confirm if firmware will be available for both 64 pin and 100 pin tqfp packages!

Am ordering parts now

Great work Peter. . .

For everything Micromite visit micromite.org

Direct Email: whitewizzard@micromite.o

matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 8604

Posted: 12:45am 30 Jan 2015

Copy link to clipboard

Print this post

Pins on the 64-pin chip are:
16,15,14,13,12,11,17,18,21,22,23,24,27,28,29,30
in that order (portb0..15)

The same firmware will work on both versions of the chip

Zonker

Guru

Joined: 18/08/2012
Location: United States
Posts: 761

Posted: 01:19am 30 Jan 2015

Copy link to clipboard

Print this post

OMG..!

So, once a proper display is chosen, (or group of them) we can start laying out a CPU back board for them..! Sweet..! You da man Matherp..! I will keep an eye on this one...

Grogster

Admin Group

Joined: 31/12/2012
Location: New Zealand
Posts: 9082

Posted: 01:41am 30 Jan 2015

Copy link to clipboard

Print this post

WOW.

Just when you think it'll take a while to top the 170's........(drool)....

Excellent work, matherp, and my congratulations to both you and Geoff for collaborating on this idea.

My PCB layout senses are tingling already, so I will most likely have a go at a preliminary PCB layout for the new beast in the next few days.

This new chip really deserves it's own thread separate from this one.

Smoke makes things work. When the smoke gets out, it stops!

Frank N. Furter
Guru

Joined: 28/05/2012
Location: Germany
Posts: 815

Posted: 02:10am 30 Jan 2015

Copy link to clipboard

Print this post

THAT'S CRAZY - WHERE CAN I GET A PIC32MX470F512 AND THE FIRMWARE???

Frank

Grogster

Admin Group

Joined: 31/12/2012
Location: New Zealand
Posts: 9082

Posted: 02:50am 30 Jan 2015

Copy link to clipboard

Print this post

PIC32MX 64-pin chip can be had here.

820 in stock, US$6.46 each.

EDIT: Preliminary DIL breakout PCB - no tracks yet. This is a standard 2.54mm grid, with 20.32mm pin spacing.

Edited by Grogster 2015-01-31

Smoke makes things work. When the smoke gets out, it stops!

Page 2 of 3

Print this page