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Forum Index : Microcontroller and PC projects : New 4 inch LCD
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palcal Guru  Joined: 12/10/2011 Location: AustraliaPosts: 1805 |
Having bought one of these it prompted me to get out a couple of ILI9488 3.5" displays that I have. I loaded the driver OK and tested both the panels OK, but when I do the GUI CALIBRATE it comes up Portrait no matter whether I set L or P. Then when I touch the second target I get an error Touch Hardware Failure. Both panels are the same, I'm suspecting faulty panels ? "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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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 1652 |
dunno, only got one 4 inch but got the resistor diode addon. seems necessary for touch and sd card but dunno, mine works with resistor diode combo and ili 9341 is interchangeable pin for pin and works. |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3022 |
Have you done the resistor + diode + pin clip as shown in Peter's photo? PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1805 |
@ lizby.......Yes did that "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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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 1805 |
This works well for me. Note the RLANDSCAPE in the Options. See if that makes a difference. Edit Another thing to try is copy my calibration first then re-calibrate if needed. GUI CALIBRATE 0, 3820, 408, -1306, 946  Edited 2024-03-16 13:52 by phil99 Footnote added 2024-04-15 11:52 by phil99 The 4" IPS ILI9488 is different to the panel above. The resistors near the SD socket are 4.7k pull-ups. R8 on SDO must be removed if the SD card sharing SPI with the LCD panel. Otherwise the 10k (can be 4.7k to 10k) is unable to pass SDO to MISO. You can use other diodes provided they have sufficient junction capacitance. eg 1N400x series rectifiers work but 1N914 and 1N4148 don't unless you add 22pF to 150pF in parallel. |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1805 |
@ phil99.....tried that, still no go. They have to be dud panels. "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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| morgs67 Regular Member  Joined: 10/07/2019 Location: AustraliaPosts: 71 |
This is another of phil99 solutions- https://www.thebackshed.com/forum/ViewTopic.php?TID=11419&PID=191429 tony |
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| phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 1805 |
Yes, that does work and used it for quite a while but further down that thread I found just 10kΩ and 1N5819 works the same. |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8600 |
Did you remove the T_CS pin as in my picture? |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 815 |
Have you connected the LCD to 3V3 or 5V? I operate mine at 3V3 and first had to close the solder jumper J1. Otherwise the TOUCH chip and the SD card holder are not supplied with voltage. Can you post a picture of your circuit board? Frank |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1805 |
I'm running on 5V. I have connected other displays to this board and they all work fine. "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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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8600 |
I realised that in the editor, with the exception of SSD1963 displays which support H/W scrolling, it was much quicker to redraw the whole screen rather than the current read/write mechanism that the scroll function uses. The attached (PicoMite only at the moment) implements this in the editor and makes editing on a ILI9488/ILI9341/ST7789_320 MUCH faster. Please try the attached and let me know how you get on. Unfortunately, this does nothing for scrolling a SPI screen at the command prompt. This will still be very slow (about 1 second per line on a ILI9488) PicoMite.zip Edited 2024-03-16 19:09 by matherp |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 815 |
I meant a picture of the PCB of your LCD display. I first had to close the solder jumper J1 there.  You can see the solder jumper at the bottom left of this picture. (In this picture, the touch chip is not fitted!) YOU MAY THEN ONLY CONNECT 3V3 AS VCC!!! Frank |
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| Bleep Guru Joined: 09/01/2022 Location: United KingdomPosts: 414 |
Hi Peter, Thanks for the editor scrolling update, unfortunately I don't yet have a 9488 display, should be able to test next week maybe. Would this update, if implimented fully, do anything to allow 9481 type displays to be used as a console? I'm suspecting not, because you will still need the panel read/write for other functionality. Regards Kevin. |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8600 |
No: it works on the ILI9488/ILI9341/ST7789_320 which are the only SPI displays with reliable read which is, as you surmise, needed for full console functionality. One could envisage having a "ascii" framebuffer in memory holding text but it would take away a biggish chunk of memory and is a pretty complicated bit of code to implement with colour support |
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bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2870 |
Hi Bleep, All, I, and I think AndrewG, don’t try to read from the display and indeed cut the Miso pin off from the TFT (keep it for touch). We don’t use it for console and for what we use them for super speed is not a requirement. What I really like about the display is that they seem to be super bright and clear colours compared to many smaller displays. The touch screen also seems more responsive than, say, the 2.8” modules. For our aging eyes the size is perfect. For our applications it is brilliant, if you want to play pac kong, or donkey man, then I can’t advise as to its suitability speed wise and whether you can read with the resistor/diode hack. Kind Regards, Mick . Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| Bleep Guru Joined: 09/01/2022 Location: United KingdomPosts: 414 |
Hi Peter, Suddenly realised I do have a ILI9341 panel 240x320, so have tested your new firmware on that, scrolling in editor noticeably faster. :-) Hopefully next week I'll be able to try a ILI9488 panel 320x480, see how that now look. Thanks. Regards Kevin. |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3022 |
Super. In the editor, with an ILI9488, single line scroll up or down is about as fast as I can hit the arrow key. With the arrow key held down, it appears to scroll at about 2 lines per second--maybe a little faster. It was usable before, but this is superior. Thanks. My options: > option list PicoMite MMBasic Version 5.09.00b6 OPTION SERIAL CONSOLE COM1,GP0,GP1 OPTION SYSTEM SPI GP2,GP3,GP4 OPTION SYSTEM I2C GP10,GP11 OPTION CPUSPEED 252000 'KHz OPTION LCDPANEL CONSOLE OPTION DISPLAY 26, 60 OPTION LCDPANEL ILI9488, LANDSCAPE,GP20,GP19,GP18 OPTION GUI CONTROLS 40 OPTION TOUCH GP21,GP22 GUI CALIBRATE 0, 3950, 3882, -1244, -859 OPTION SDCARD GP5 OPTION RTC AUTO ENABLE > ~ Edited 2024-03-17 02:40 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8600 |
Here is another experimental tweak - try things like LIST, LIST COMMANDS, LIST FUNCTIONS Then there is a new optional setting for OPTION LCDPANEL CONSOLE - "NOSCROLL" OPTION LCDPANEL CONSOLE [,font [,foregroundcolour] [,backgroundcolour] [,defaultbacklightsetting] [,NOSCROLL]] e.g. OPTION LCDPANEL CONSOLE 1,,,,NOSCROLL If NOSCROLL is set whenever text gets to the bottom of the display rather than scrolling the screen will be cleared and output will continue at the top of the display. This will work in a program or at the command prompt. Together with the edit mod this option will allow displays that don't support reading their framebuffer to act as console devices. This isn't implemented yet and won't be for a few days as I'm away from home and can't test. Have a play and let me know what you think. PicoMite.zip |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 815 |
Peter, that's really cool!  Can you also create a USB version? Then I can test it! Frank |
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