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Forum Index : Microcontroller and PC projects : SAVE IMAGE produces blank bmp file

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lizby
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Joined: 17/05/2016
Location: United States
Posts: 3614
Posted: 07:56pm 14 Feb 2026
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This has worked for me with the RP2040 before, but this is with an RP2350.

SAVE IMAGE "RR-1.bmp" produces this image when sent with XMODEM S "RR-1.BMP"



Photo is:



(Or I'm doing something wrong.)
PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed
 
phil99

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Joined: 11/02/2018
Location: Australia
Posts: 3013
Posted: 09:03pm 14 Feb 2026
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Tested a RP2350 V6.02.00 and image arrived on the PC with bubbles intact.
> gui test lcdpanel
> save image "guitest.bmp"
> files
A:/
  <DIR>  .
  <DIR>  ..
07:42 15-02-2026          4  bootcount
07:44 15-02-2026      38518  guitest.bmp
11:58 02-02-2026       4992  multi sensor, GPS & EEPROM reader.bas
2 directories, 3 files, 2445312 bytes free
> xmodem s "guitest.bmp"
>


What do you get if you try:-
CLS : LOAD IMAGE "RR-1.bmp"
That will show whether the problem is with Xmodem or Save Image.

If it is not saving the image the usual problem is between LCD_DO and MISO.
If the screen is a ILI9488 you need the diode/resistor fix. IN4004 anode to LCD_DO, K to MISO. 1.8kΩ from MISO to LCD_CS.

For other screens test continuity from the top of the LCD_DO pin to the top of the MISO pin.

If the touch T_DO pin is connected to MISO you must either enable OPTION TOUCH or add a 10K pullup resistor to T_CS. Otherwise T_DO can go low and block all other input to MISO.
Edited 2026-02-15 07:32 by phil99
 
lizby
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Joined: 17/05/2016
Location: United States
Posts: 3614
Posted: 01:27am 15 Feb 2026
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  phil99 said  If it is not saving the image the usual problem is between LCD_DO and MISO.


Bingo! I was wiring it with Dupont cables, and when I got it to display, I quit, leaving DO/MISO unconnected.

Thank you.
PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed
 
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