E.setBootUpCode

[gfwilliams]

Discussion here:

http://forum.espruino.com/conversations/275207/

Strangely it didn't seem to make it into a GitHub issue. Would be very easy with the addition of: #738

[gfwilliams]

So currently the code here does:

• If memory[FLASH_MAGIC_LOCATION]!=FLASH_MAGIC, no code saved - return
• Check first uint32 of saved code. It tells us how much program data there is
• Decompress the code from flash into RAM

Ideally, there would be a second uint32 in the saved code that contains the length of a string in flash with code (as text) that would be executed at startup.

If that uint32 existed, at bootup (right before onInit was called) the textual code would be loaded into a memoryarea and executed.

Actually I'll take a quick look at this now...

[nkrkv]

Got it. I will think how we can do this.

Is it an existing issue on GitHub (#740?) or should we create new to discuss problems related to the feature?

[gfwilliams]

It's an existing issue, so best to discuss here.

Initially this exists because certain things (like the Espruino PC) would really benefit from having some code that always runs regardless of the state of the interpreter.

But it'll solve your issues on espruino/EspruinoTools#28 too :)

[gfwilliams]

Ok, try the boot_code branch.

You can do:

E.setBootCode("HELLO=42;all_my_js_code_here")

After doing that, Espruino won't actually reset. You'll have to do it with reset() or load().

When you do reset, Espruino will execute all that JS code as if it has just been uploaded.

After that, to reset Espruino to a fresh state you'd need: E.setBootCode("");reset()

Not ideal, but it's a good start. I need to think a bit about the interaction with save() and reset().

[gfwilliams]

Branch deleted, merged into master.

[nkrkv]

Whoa! Works perfectly. Thank you for the feature and for merging it into master.