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Forum Index : Microcontroller and PC projects : Practical Electronics PicoMite display problems

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pepperm
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Joined: 14/11/2022
Location: United Kingdom
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Posted: 02:16pm 17 Nov 2022
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Hi

I'm following the PicoMite articles in Practical Electronics (Aug 2022 UK) and am working with the Waveshare Pico-Res Touch 2.8 and 3.5inch LCD modules and am having two different problems with "PicoMite MMBasic Version 5.07.05RC9".

With the 2.8 inch display, everything seems to work except that when I come to run "gui test lcdpanel", the test display works initially but then when I returnto the project a few hours later, the test just runs for about 2 seconds then the display never shows anything else.

With the 3.5 inch display, I just cant access the SD card and just get an "Error : SD Card not found" error.

For both displays I have followed, many times all the suggested config options, and show the results of "Option List" for the 3.5 inch display below.

So, has anyone else followed the worked examples and got them to work completelt, as I haven't or can anyone suggest why I am having these problems please?

3.5" module config:
PicoMite MMBasic Version 5.07.05RC9
OPTION SYSTEM SPI GP10,GP11,GP12
OPTION SYSTEM I2C GP20,GP21
OPTION CPUSPEED (KHz) 252000
OPTION LCDPANEL ILI9488W, RLANDSCAPE,GP8,GP15,GP9
OPTION TOUCH GP16,GP17
GUI CALIBRATE 1, 1113, 499, -4042, -104000
OPTION SDCARD GP22, GP5, GP18, GP19
OPTION RTC AUTO ENABLE


Mark
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 8516
Posted: 02:37pm 17 Nov 2022
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3.5" sdcard should just be OPTION SDCARD GP22. It shares SPI with the display. If the article says otherwise it is wrong.

You should also add GP13 to the set up of both displays. This controls the LCD backlight. It is possible that this is the problem with the 2.8" display.

OPTION LCDPANEL st7789_320, LANDSCAPE,GP8,GP15,GP9,gp13
Edited 2022-11-18 00:41 by matherp
 
pepperm
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Posted: 07:46pm 17 Nov 2022
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Thanks, it does say those things in the article but I'll give your suggestions a go when I get home.
 
pepperm
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Posted: 09:43am 18 Nov 2022
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Right... I have now configured the Picos with the following PicoMite setups (put here just in case anyone else wants to know) and can confirm that the setup for the SD card in PE Aug 2022 for the 3.5" display are wrong. "OPTION SDCARD GP22" sorts it out compared to what is printed in the magazine.

However, I still have the same problem with the 2.8" display in that when I initially configure everything the "gui test lcdpanel" command works as expected (losts of coloured circles in the display). The trouble is that if I unplug the Pico and restart, then issue the "gui test lcdpanel" command the display kicks into life for 1-2 seconds then goes blank. Further tests are just met with a blank screen. I have even tried programatically (with the RTCdemo.txt program mentioned in the article) displaying things but this still results in a blank screen.

I thought initially that the 2.8" display was just faulty, but if I tear everything down and rebuild and reconfigure, I get the same operation, be it short term.

Any ideas?

Here are the configs:

"Waveshare Pico-ResTouch-LCD-2.8" from PE aug 2022
Option reset
option list
option cpuspeed 252000
option system spi GP10, GP11, GP12
option lcdpanel st7789_320, l, gp8, gp15, gp9, gp13
gui test lcd panel
option touch gp16, gp17
gui calibrate
gui test touch
option sdcard gp22
files
option system i2c gp20, gp21
rtc settime 22,11,18,10,00,00
option rtc auto enable
print time$
print date$
option list

"Waveshare Pico-ResTouch-LCD-3.5" from PE aug 2022
Option reset
option list - confirm empty
option cpuspeed 252000
option system spi GP10, GP11, GP12
option lcdpanel ili9488w, rl, gp8, gp15, gp9, gp13
gui test lcd panel
option touch gp16, gp17
gui calibrate
gui test touch
option sdcard gp22
files
option system i2c gp20, gp21
rtc settime 22,11,18,10,00,00
option rtc auto enable
print time$
print date$
option list
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 8516
Posted: 09:56am 18 Nov 2022
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Lots of people use that display and no-one has raised the issue before so there must be something strange going on - dry joint or similar. I've just replicated your exact setting and it works fine each and every time
 
pepperm
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Posted: 10:08am 18 Nov 2022
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Thanks for the duplicating, I presume with the 2.8" didplay. I guess that means that the display is faulty. I'll resolder the joints.

Thanks.
 
Pluto
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Joined: 09/06/2017
Location: Finland
Posts: 321
Posted: 10:55am 18 Nov 2022
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Please note that ILI9488 problems have been reported earlier on the forum.
If I remember correctly, thera were several solutions:
-cut the MISO connection,
-install a resistor in the MISO line, or
-install a transistor in the MISO line
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 8516
Posted: 10:56am 18 Nov 2022
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  Quote  Please note that ILI9488 problems have been reported earlier on the forum.


Not relevant to the Waveshare version which doesn't expose MISO
 
Pluto
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Joined: 09/06/2017
Location: Finland
Posts: 321
Posted: 11:17am 18 Nov 2022
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Practical Electronics instruction for ILI9488W:
  Quote  10. OPTION SDCARD GP22, GP5, GP18, GP19 (configure
SD socket – note: we need to define the SPI pins with this
display module)


If I understand this correctly, the display and SD-card will use different SPIs.

Could you try again with your original option settings

  Quote  3.5" module config:
PicoMite MMBasic Version 5.07.05RC9
OPTION SYSTEM SPI GP10,GP11,GP12
OPTION SYSTEM I2C GP20,GP21
OPTION CPUSPEED (KHz) 252000
OPTION LCDPANEL ILI9488W, RLANDSCAPE,GP8,GP15,GP9
OPTION TOUCH GP16,GP17
GUI CALIBRATE 1, 1113, 499, -4042, -104000
OPTION SDCARD GP22, GP5, GP18, GP19
OPTION RTC AUTO ENABLE


But correct the LCDPANEL line to include the GP13 (as in the PE article):
  Quote  OPTION LCDPANEL ILI9488W, RL, GP8, GP15, GP9, GP13
 
pepperm
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Joined: 14/11/2022
Location: United Kingdom
Posts: 7
Posted: 11:18am 18 Nov 2022
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Resoldering has changed nothing. Maybe I'll order a new display and see how that works. or not.

It is very odd that if I just restart everything config wise after maybe a day of powerdown, everything works and works for hours, all until I power down then power back up again... very odd behaviour.
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 8516
Posted: 11:20am 18 Nov 2022
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  Quote  If I understand this correctly, the display and SD-card will use different SPIs.

Could you try again with your original option settings


This is pointless as it is wrong. I have the display. I developed the driver on it. I tested it and the correct settings are as the OP posted in his revised version following my advice. It is how the display is wired.
 
pepperm
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Posted: 11:20am 18 Nov 2022
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Hi

This config is for the 3.5" display, that does work. It is the 2.8" display that has a problem.

The 2.8" display used a st7789_320.

But correct the LCDPANEL line to include the GP13 (as in the PE article):
  Quote  OPTION LCDPANEL ILI9488W, RL, GP8, GP15, GP9, GP13
 
pepperm
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Joined: 14/11/2022
Location: United Kingdom
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Posted: 05:07pm 26 Nov 2022
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Well, I got the 3.5" version working as expected with the config changes, but the 2.8" version still blanks the display after about a second when using it beyond a repower or something.

As it happened I replaced the touch controller on the board and noticed that when it was removed (to be used in the 3.5" display that I blew up - dont ask) the display worked repeatedly without a problem.

The replacement 2.8" display is still in transit so will see if I get the same behaviour with that unit.
 
franzi

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Joined: 20/03/2023
Location: Germany
Posts: 6
Posted: 12:34pm 24 Mar 2023
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I've just had a new Waveshare Pico-Res-Touch 2.8 delivered, and thanks to this thread I got it up and running in no time at all. Thankyou.

I used:

SPI Setup:
OPTION System SPI GP10, GP11, GP12

Display Setup:
OPTION LCDPANEL ST7789_320, LANDSCAPE, GP8, GP15, GP9, GP13

SD Card Setup:
OPTION SDCARD GP22

Testing:
gui test lcdpanel

...and the test program started straight away.

Thanks again to all.
Edited 2023-03-24 23:09 by franzi
 
NPHighview

Senior Member

Joined: 02/09/2020
Location: United States
Posts: 187
Posted: 01:07am 31 Mar 2023
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Hi, Franzi -

Were you able to get the SD card to work in this configuration of the Waveshare Pico-Res-Touch 2.8?

I've tried both:
OPTION SDCARD GP22

and
OPTION SDCARD GP22, GP5, GP18, GP19


I can find my stored files in flash:
> DRIVE "A:"
> files
A:/
  <DIR>  .
  <DIR>  ..
00:00 01-01-2000          4  bootcount
2 directories, 1 file
> flash list
Slot 1 in use: "Rem ** DTMF Demonstration on Raspberry Pi Pico with MMBasic"
Slot 2 in use: "Rem ** Driving an RGB LED using PWM pins on Rasp.Pico in mmBasic"
Slot 3 in use: "Rem ** Neopixels based on tomshardware.com article"
Slot 4 available
Slot 5 available

But no luck with the (just formatted 1 GB Micro SD) flash card:
> DRIVE "B:"
> files
Error : SD Card not found

Edited 2023-03-31 11:08 by NPHighview
Live in the Future. It's Just Starting Now!
 
Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 5645
Posted: 06:39am 31 Mar 2023
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I *think* the SD card signals are hard-wired to the same SPI as the display on the Waveshare board, but the CS line is wired out. In that case you only need to specify the CS pin in OPTION SDCARD. (I have the schematic somewhere but not sure where...)

Note: The Waveshare boards have a set of links that change the operating mode of the SD card. AFAIK they are set to use SPI by default (Position A), as required for MMBasic.

This display really should be "plug & play". I'd suggest trying a different SD card or, at least, make sure that one is definitely formatted in FAT16 or FAT32. NTFS doesn't work.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 8516
Posted: 07:02am 31 Mar 2023
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  Quote  But no luck with the (just formatted 1 GB Micro SD) flash card:


Have you configured touch? If not the sdcard won't work
 
franzi

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Joined: 20/03/2023
Location: Germany
Posts: 6
Posted: 07:01pm 31 Mar 2023
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I've just upgraded my Picomite firmware to PicoMite MMBasic Version 5.07.07b28, and can confirm that together with the Waveshare Pico-Res-Touch-LCD-2.8 everything seems to be working OK for me. I only have the RPi Pico plugged onto the back of the display - no extension board or extras.

Options used:
> option list
PicoMite MMBasic Version 5.07.07b28
OPTION SYSTEM SPI GP10,GP11,GP12
OPTION LCDPANEL ST7789_320, LANDSCAPE,GP8,GP15,GP9,GP13
OPTION TOUCH GP16,GP17
GUI CALIBRATE (result: 0, 418, 3878, 896, -657)
OPTION SDCARD GP22

I've also checked my SDcard with load image "B:/imagename.bmp" and it's working fine. I'm not sure but I think that I'd activated touch before the SDcard. Backlight is also working (GP13), but I haven't needed I2C to be set, since the Pico is directly coupled to the Display and communicates over SPI (preset).

File listing on drive B is working:
> drive "B:"
> files
B:/
17:33 25-01-2021     460854  cat.bmp
14:21 11-11-2014     230454  flower.bmp
23:21 29-03-2023     265974  foodtruck.bmp
17:33 25-01-2021     460854  hamster.bmp
20:37 27-03-2023      65590  imbissTempleNeukoeln128.bmp
01:41 27-03-2023         14  test.txt
16:10 07-03-2015     230454  tiger.bmp
0 directories, 7 files


I'm using a 32GB SDcard repurposed from an old Raspberry Pi, reformatted to FAT32 of course.

Franzi
 
NPHighview

Senior Member

Joined: 02/09/2020
Location: United States
Posts: 187
Posted: 09:27pm 31 Mar 2023
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Ah! Thank you, Franzi, Peter, and Mick. I cleared and re-established all of the options, calibrated touch, ran Peter's digital clock demo, and SD access is now working. I've got PicoMite MMBasic V.5.07.06 at the moment.

Is there an RTC on the Waveshare board? Details are sketchy at best...

Now, to go get my Colour Maximite programs from a year or so ago and give them a whack on the Pico!

Thanks again!

- Steve


Rem ** First test of WaveShare 2.8 LCD Panel Assembly
Rem ** March 30, 2023  S.F. Johnson  Newbury Park, California

CLS

DO WHILE Touch(X) = -1
 TEXT MM.HRes/2, MM.VRes/4,   Time$, "CM", 1, 4, RGB(CYAN)
 TEXT MM.HRes/2, MM.VRes*3/4, Date$, "CM", 1, 3, RGB(GREEN)
LOOP

CLS

Live in the Future. It's Just Starting Now!
 
stanleyella

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Joined: 25/06/2022
Location: United Kingdom
Posts: 1565
Posted: 09:47pm 31 Mar 2023
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I found the ili9341 sd card is drive a:
like play wav "a:/t1" to play a wav file on the sd card
when the sd card is supposed to be b:/
 
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