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Forum Index : Microcontroller and PC projects : 1.8" TFT ST7735 on MM(170) 28 pin?
| Author | Message | ||||
| Andrew_G Guru  Joined: 18/10/2016 Location: AustraliaPosts: 868 |
Hi, this follows on from the thread started by Grogster Here. I'm looking for a small (say 1.8") colour LCD for a MM170(28pin) project (touch would be nice but is not essential for me). Most/all 1.8" displays appear to use ST7735 controllers which, while supported by MM Plus, do not appear to be supported on a 170. If this is the case what are my options to get a small colour LCD display? Thanks, Andrew |
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| Andrew_G Guru Joined: 18/10/2016 Location: AustraliaPosts: 868 |
Well, once again I can answer my own query (and I had spent many hours searching and reading articles on TBS and Geoff's site etc). There in the latest distribution of MMBasic in the Embedded Fonts section is a pdf and .BAS file that does exactly what I need - it is referenced on page 18 of the MM User Manual which I'd searched in vain on "ST7735" (entirely my fault). Thanks to Peter M for writing the driver. I'll now go and buy some 1.8" display(s) and give it a go. Cheers, Andrew |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9483 |
 Smoke makes things work. When the smoke gets out, it stops! |
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palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1965 |
I'll have to take up smoking.  Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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| Andrew_G Guru Joined: 18/10/2016 Location: AustraliaPosts: 868 |
Hi again, Well, my 1.8" displays arrived and I plugged one into breadboard connected to an LCD backpack with the 2.8" LCD removed. I edited ST7735-Driver.BAS to include "ST7735 16, 26, 187, 1" and loaded it into the mm, powered down then up etc. The connections are shown on the following picture of the card. I have not connected the pins for the SD card - is this a problem?  After trying most permutations for connections GUI TEST LCDPANEL seemed to work BUT: - from the console CLS only cleared 40% of the screen (the other 60% stayed as the circles) (drawing a black box 128x160 clears the screen) - any Text x, y , "Test" . . . wrote the text in landscape but as a mirror image. (not inverted but mirrored) - I have played with the orientation options - all did as expected except everything was mirrored! Any suggestions? Cheers, Andrew |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10066 |
Try replacing the body of the CFunction with the attached. Sounds like your display isn't keeping up with the data rate so I've slowed it down. Could also be a lead length/crosstalk issue. 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| Andrew_G Guru Joined: 18/10/2016 Location: AustraliaPosts: 868 |
Sorry Peter but no change. When it starts up ~40% of the screen is black (ie the section that CLS works on) and 60% is coloured snow. Don't lose any sleep over it but a "Blinding Flash of the Obvious" (BFO) may occur sometime . . . The resistor is gone! Thanks for trying, (you can't support every piece of kit on ebay) Andrew |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2927 |
Mind you, Peter is doing a pretty good job of actually doing so . . . |
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| Andrew_G Guru Joined: 18/10/2016 Location: AustraliaPosts: 868 |
Yes WW, Peter does a remarkable job! More trials this morning: - CLS only clears 40% of the screen within a program and on MM Edit's chat - a Box with a fill overwrites the whole screen (within the box) - the colours are scrambled, eg . . . rgb(yellow) gives cyan, red gives blue, green is OK, cyan gives yellow and blue gives red - I have two of the LCDs and they each behave the same way. Apart from being mirrored they are nice little displays - just what I needed for a GPS speedometer that fits in my car's instruments (a 2.8" touch is too big). Cheers, Andrew |
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| Andrew_G Guru Joined: 18/10/2016 Location: AustraliaPosts: 868 |
Several steps forward but one hurdle still to jump - it won't Autostart (it requires the Console to be connected and a "Run" command). Using the extremely useful program FontTweak by TassieJim I mirrored all my fonts (and set the location for Texting character by character). I now have it working and looking quite nice - and now on its own circuit, without the LCD Backpack. But as I said above, it won't autostart. I've tried: - "Option Autostart On" in the program and/or from the console - Changing the mm.startup line for the driver to be ST7735 16, 23, 18, 1 and changed the connections to suit (ie 23 instead of the original 26) - Deleting the Library and trying again (but I haven't erased the chip or tried a new chip yet). Any suggestions? Andrew (I had to smile when I realised that "WAIT" in normal font is "TIAW" in my mirrored font) |
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BobD Guru Joined: 07/12/2011 Location: AustraliaPosts: 935 |
Andrew It's AUTORUN Bob |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2927 |
OPTION AUTORUN ON and OPTION AUTORUN OFF to disable it (or type NEW) NOTE: When downloading a program from MMEDIT, you will need to re-type OPTION AUTORUN ON again (or at least you do in my 'old' version of MMEDIT) WW |
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| Andrew_G Guru Joined: 18/10/2016 Location: AustraliaPosts: 868 |
Thanks but sorry Bob and WW but it is not as simple as that (I wished it were). I have actually been using "Option Autorun On" (but "mis-spoke" above - to quote a former US President). I really do suspect my connections or, most likely, the compatibility of the device. Cheers, Andrew |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2927 |
If your program is working fine when you type RUN, but does not work with AUTORUN on, then are there any error messages you are seeing with a console connection (i.e. with AutoRun on)? Also, is it only at POWER UP that it fails to autostart, or also whenever the MM is reset (i.e. power already applied)? IF only at power-up, then there is most likely a timing issue between the hardware. Unless the PIC is corrupt in some way, then I do not see how else the AUTORUN will fail to operate without a message being given on the console.  Be interested to know what the issue is here . . . . |
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| Andrew_G Guru Joined: 18/10/2016 Location: AustraliaPosts: 868 |
Many thanks WW (et Al) There were no error messages etc so I decided to try a new chip (loaded the firmware, Peter M's original driver etc). It worked right away with no mirrored font and no split screen! Only problem was that the flipped fonts I created were now flipped. I've gone back to normal fonts so all should be good with Peter's driver perfect! In summary - a corrupt chip! (In the process I have cooked a SMD resistor on my console connector so I will be grounded till I can get a new one - too much smoke escaped so it stopped working - even turned my PC off) Many thanks to all, Andrew. |
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