Just thinking out loud...
Would NuttX benefit from a FrameBuffer stdout driver (e.g. /dev/fbcon)
that allowed a pipe/dup to replace stdout, or the use of
CONFIG_NSH_ALTSTDOUT and/or CONFIG_ALTSTDERR for console output?
In my case, this is just for MCUboot messages in the case of bootloader
issues; to let the user know what's going on and, perhaps, guide the
user through recovery procedures. The LCD is the only display available,
as a serial console is not available to the user for this embedded
device. But could be a generally useful thing?
On 16/02/2025 10:45, Alan C. Assis wrote:
Hi Tim,
I think there is not a framebuffer text in place for NuttX, but you can use
the code to handle text fonts from nx graphics to render the text directly
in the framebuffer.
For Linux some years ago I used fbtext
https://sourceforge.net/projects/fbtext/ to print a message from initrd to
let user know a secret key the decript the disk.
Alternatively if you want to print images in the screen you can use
something like fbprint ( https://github.com/Weinsen/fbprint ).
BR,
Alan
On Saturday, February 15, 2025, Tim Hardisty <timhardist...@gmail.com>
wrote:
What is efficient solution to just do text though?
On 15 Feb 2025, at 13:42, Alan C. Assis <acas...@gmail.com> wrote:
Hi Tim,
You can create a NuttX application with LVGL and display your message or
image.
Actually you don't need to use a graphic library if you just want to
write
in the framebuffer, you can convert image to display directly in the
/dev/fb0
BR,
Alan
On Sat, Feb 15, 2025 at 7:45 AM Tim Hardisty <timhardist...@gmail.com>
wrote:
Hello NuttX Colleagues!
During MCUboot I want to display text messages on the framebuffer LCD
driver (/dev/fb). This could either be via a FB console (useful for
other reasons) or a FB terminal, or something else.
I also quite like the idea of my main graphics app - LVGL based - having
a console option (for syslog messages, perhaps), so perhaps LVGL is an
option, but I'm wanting to keep the size down of course.
Which of the NuttX armoury of features might be a good choice for this?
Thanks!
TimJTi
