开云体育

Many ask about bigger display.
For test perfomance i order 7` display module 800x480 resolution on RA8875 chip + FT5426 capacitive touch (exist resistive touch variant, but for finger control this more better).

This chip allow many features and work on SPI bus as another displays for NanoVNA
Also have hardware support:

resistive touch
external 4x5 keyboard
Brightness control
Block Transfer Engine (BTE) Supports with 2D Function, Compatible with 2D BitBLT Function. (bitmaps, lines, rectangles, circle and many more)
Font support
External flash support (allow upload bitmaps, fonts)

Minuses:

Cost ~40-50$
I found only TN module, need search for IPS

Finish RA8875 display driver + FT5426 capacitive touch support for NanoVNA-H4.

Write video for show all display functions (sorry for quality)

Possible see perfomance on 401 points measure and draw
Brightness control
SD card work (but save screen time ~4s, need 2x slowdown SPI bus for read display data for correct read (used long wires on test board) and also more bigger display have 2x more pixels, and need save 2x more to SD)
Touch test

Perfomance can improved, at this moment it use software plot as in old displays (also possible use 8bit color mode).

Exist one difficult use this module for V2:
My module have capacitive touch and need i2c bus for work (connect it on V2 more difficult) if use resistive touch it more easy, but need order another display module.

Attach screenshot example from SD card

Also for test i use nanoVNA Saver, and it also can grab 401 point and 800x480 image

As i see H4 platform allow connect big display, only one slowdown - Smitch chart, render it little slow, better use bitmaps on external flash.

DiSlord,
Would it be easy to add an SPI flash chip like this to the board...
this one is discontinued but if there is an alternative chip, it would allow for not only additional bitmaps, but maybe dual-booting of alternate FW.?

Isn't this how the Nanovna F stores code?
Thanks,?Larry


On Sat, 22 Aug 2020 at 8:09 PM, DiSlord<dislordlive@...> wrote: Attach screenshot example from SD card

Also for test i use nanoVNA Saver, and it also can grab 401 point and 800x480 image

As i see H4 platform allow connect big display, only one slowdown - Smitch chart, render it little slow, better use bitmaps on external flash.