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lew247

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Joined: 23/12/2015
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Posted: 12:40pm 02 Feb 2022

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Can anyone tell me what I've done wrong?

I'm trying to get the Picomite to display everything coming from the GPS unit
but I get nothing when I run the program

SETPIN rx, tx, COM1 and according to every pinout diagram I have then GPIO1 is RX and GPIO0 is TX

I've even tried setpin GP0,GP1, Com1 but it still gives no output on the console

setpin GP1,GP0, Com1
Open "COM1:115200" AS GPS,0,1
DO
If GPS(VALID) = 1 Then
print GPS(date)
print GPS(time)
END IF
pause 1000
Loop

I've tested the GPS module on the PC using a uart adaptor and it works perfectly and the baud rate is 115200
it receives all 4 different gps constellations and I can see the output from the GPS unit on the serial console on the PC and using the Ublox software as well.

matherp
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Joined: 11/12/2012
Location: United Kingdom
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Posted: 01:21pm 02 Feb 2022

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Are you connecting Rx to tx and visa versa? You should be.

lew247

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Joined: 23/12/2015
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Posts: 1702

Posted: 01:29pm 02 Feb 2022

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matherp said Are you connecting Rx to tx and visa versa? You should be.

Yes, exactly the same as I had it on the PC uart adaptor tx to rx and rx to tx
TX on the GPS to GPI and RX on the GPS to GP0

thwill

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Joined: 16/09/2019
Location: United Kingdom
Posts: 4311

Posted: 01:45pm 02 Feb 2022

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I'm working the same project as Lewis and seeing exactly the same problem though I haven't gone through the process of eliminating all user error yet.

This was all working before Christmas and I'm starting to wonder if there is any chance that GPS somehow got broken in the latest PicoMite builds ? (but even so I would have thought I could have got something from it by treating it as a non-GPS serial device) - I'm running the 5.07.03 release (what about you Lewis?), but I'm hoping I've got a PicoMite running the earlier *working* version somewhere.

Currently haven't got any free time until Friday to investigate further though.

Best wishes,

Tom
Edited 2022-02-02 23:55 by thwill

MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures

Volhout
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Joined: 05/03/2018
Location: Netherlands
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Posted: 02:15pm 02 Feb 2022

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Hi Lew247,

Do you have any conflicting options set (like OPTION SYSTEM SPI or OPTION I2C on these pins ?) Sorry, I ran out of picomites, so I can't help you with debugging...

Regards,

Volhout
Edited 2022-02-03 00:18 by Volhout

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lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1702

Posted: 03:02pm 02 Feb 2022

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Apologies everyone
I had indeed somehow got the tx and rx on the Pico reversed, even though I was positive I had it correct

Rx the GPS goes to Pin 1 on the Pico and TX on the GPS to Pin 2 on the Pico
Tom
This code works

setpin GP1,GP0, Com1
Open "COM1:460800" AS GPS,0,1
DO
If GPS(VALID) = 1 Then
print GPS(date)
print GPS(time)
END IF
pause 1000
Loop

***change the baud rate to what you have yours set at - it will be much lower***

thwill

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Joined: 16/09/2019
Location: United Kingdom
Posts: 4311

Posted: 03:11pm 02 Feb 2022

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Great ... and I made the same mistake.

Lewis assuming that the PicoMite manual is correct you've transposed RX and TX on all the schematics for the PicoMite GPS Speedometer ... no wonder we've been having difficulty

.

Best wishes,

Tom
Edited 2022-02-03 01:53 by thwill

MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures

Mixtel90

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Joined: 05/10/2019
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Posted: 04:08pm 02 Feb 2022

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My mind's been a blank for years. Just ask Mrs Mixtel90 ... :(

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

Plasmamac

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Joined: 31/01/2019
Location: Germany
Posts: 579

Posted: 04:20pm 02 Feb 2022

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I know that feeling.

Plasma

lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1702

Posted: 05:54pm 02 Feb 2022

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2nd question:

How do I connect an ILI9341 to the Picomite? The standard Rp2040 board with 40 pins

Where does the LED pin connect to?

In the manual I see this:

Quote For the ILI9163, ILI9341, ST7735, ST7735S, SSD1331, ST7789, ILI9481, ILI9488, ILI9488W, ST7789_135 and
ST7789_320 displays an optional parameter ', backlight' can be added to the end of the configuration parameters
which specifies a pin to use to control the brightness of the backlight. This will setup a PWM output on that pin
with a frequency of 1KHz and an initial duty cycle of 99%.
You can then use the BACKLIGHT command to change the brightness between 0 and 100%. The PWM channel
is blocked for normal PWM use and must not conflict with the PWM channel that may be set up for audio.
For example:
OPTION LCDPANEL ILI9341, OR, DC, RESET, CS, GP11
The backlight can then be set to 40% with this command:

Does this mean the LED pin on the ILI9341 can be connected to GP11?
or does it have to have it's own 3.3V or 5V power?

Mixtel90

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Posted: 06:51pm 02 Feb 2022

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On the more recent displays the LED pin is connected to the base of a transistor (Q1 on the display) via a 1k resistor. You can connect it direct to 3V3 to get full brightness or to a digital output for On/Off or PWM control.

Early versions didn't have the transistor and an external one was needed.

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1702

Posted: 07:03pm 02 Feb 2022

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Mixtel90 said On the more recent displays the LED pin is connected to the base of a transistor (Q1 on the display) via a 1k resistor. You can connect it direct to 3V3 to get full brightness or to a digital output for On/Off or PWM control.

Early versions didn't have the transistor and an external one was needed.

So I can't just connect an ILI9341 display directly to one of these?
The manual says nothing about not being able to

Edited 2022-02-03 05:04 by lew247

Mixtel90

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Posted: 07:28pm 02 Feb 2022

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The PicoMite manual describes how to do it on page 43. :)

OPTION LCDPANEL ILI9341, OR, DC, RESET, CS

more detail on page 48

OPTION LCDPANEL ILI9341, OR, DC, RESET, CS, Backlight

Exactly which pins you use is up to you - you set them up in the OPTION lines as required. Obviously, if you want a dimmable display you'll have to specify one of the PWM pins for "Backlight".
Edited 2022-02-03 05:31 by Mixtel90

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

lew247

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Joined: 23/12/2015
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Posts: 1702

Posted: 07:54pm 02 Feb 2022

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Mixtel90 said The PicoMite manual describes how to do it on page 43. :)

OPTION LCDPANEL ILI9341, OR, DC, RESET, CS

more detail on page 48

OPTION LCDPANEL ILI9341, OR, DC, RESET, CS, Backlight

Exactly which pins you use is up to you - you set them up in the OPTION lines as required. Obviously, if you want a dimmable display you'll have to specify one of the PWM pins for "Backlight".

I read the manual as you can see by the quote I took from it
What it DOESN'T say is where you attach the LED pin on the ILI9341
Or can I leave it disconnected?

Mixtel90

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Posted: 08:18pm 02 Feb 2022

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You can connect it to 3V3 for fixed full brightness.
You can connect it to any DC output pin and set it high for On or low for Off.
You can connect it to a PWM pin as described on page 48 then control it with the BACKLIGHT command.

I can't tell you exactly which pin to use as that will depend on what pins are already in use on your setup. You could use, for example, GP11 (PWM5B) as it says in the manual - but not if you are already using it for something else.

If you leave the LED pin disconnected the display will remain dark and you won't see anything.

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1702

Posted: 11:47am 03 Feb 2022

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I'm still having problems
This is how I have it setup

LCD DIN GP19
LCD CLK GP18
LCD DC GP8
LCD CS GP9
LCD RST GP12
LCD BL GP15

OPTION SYSTEM SPI GP18, GP19, GP16
OPTION LCDPANEL ILI9341, L, GP8, GP12, GP9

SETPIN GP15, DOUT
Pin(GP15) = 1
GUI TEST LCDPANEL

I get nothing but a white screen

disco4now

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Joined: 18/12/2014
Location: Australia
Posts: 1003

Posted: 12:08pm 03 Feb 2022

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See the other thread where symptom was a white screen. Turns out the display was really an ILI9488, but sold as an ILI9341

Latest F4 Latest H7 FotS

Glen0
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Joined: 12/10/2014
Location: New Zealand
Posts: 95

Posted: 08:16pm 03 Feb 2022

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I thought I was buying an ILI9341 but received an ILI9488 with no markings on it to say what controller it used.
Below is how mine is configured. I take the LED pin straight to the "VSYS" pin which is the equivalent of a 100% duty cycle PWM, ie. maximum brightness.I have tried a CPU speed of 133MHz and 250MHz
Don't bother with Touch or SD connections yet, just follow the display pin connections on page 48 of the manual.
User Manual, " Picomite, MMBasic Ver 5.07.03 Rev #3"
See my thread. https://www.thebackshed.com/forum/ViewTopic.php?FID=16&TID=14513

print mm.ver
5.0703
>
> option list
OPTION SYSTEM SPI GP18,GP19,GP16
OPTION CPUSPEED (KHz) 250000
OPTION LCDPANEL ILI9488, LANDSCAPE,GP15,GP14,GP13
>
> flash list 2
SetPin 31, AIN
Do
B = Pin(31)
Pause 1
Pause 1
'Print B
Text 1, 1, "A"
Text 312, 1, "A"
Text 1, 229, "A"
Text 312, 229, "A"
Text 10,100,Date$+ " "+Time$,,3
Pause 2000
Loop

https://www.thebackshed.com/forum/ViewTopic.php?FID=16&TID=14513

lew247

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Posts: 1702

Posted: 09:09pm 03 Feb 2022

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It was indeed an ILI9488 sold as an ILI9341
working now thanks everyone

Glen0
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Joined: 12/10/2014
Location: New Zealand
Posts: 95

Posted: 09:31pm 03 Feb 2022

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Have you got the SD working?

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