Example Idea: Flash page settings

[jamesmunns]

Give an example of an external flash page you can flash with probe-rs

from chat:

Is there any way for me to make some piece of "meta-data" (SSID name and pass) available to the binary (rp pico w in my case) that is "passed in" on deploy of the binary (probe-rs via debug probe, or UF2 format and copy)

without me putting in host env or generating code from [build.rs](http://build.rs/) and building a new binary each time
without a file system the binary can read from
The only thing I can think of is a tool that replaces some strings in the binary, just before copying.... but wondered if others have solved this problem is some more standard way....

12:01PM
There's not a standard way, a common way is something like:

use postcard or some other format to make a bin file/payload
use probe-rs download to flash it at some predictable location, usually outside your firmware
you can define like a 4k region in your memory-x to avoid, say the last 4k of the flash chip, and read it from there.
12:05PM
like, you can make a little cli tool to make the bin file, like:

mytool --ssid='whatever' --password='lololol123' --output='./target/config.bin'
probe-rs download --format bin --protocol swd --speed 12000 --chip rp2040 --base-address 0x10020000 ./target/config.bin
or something

(you could also make a tool that used probe-rs as a lib to do the same thing in one step, if you prefer)