low level flash access

Posted on Sat 17th, December 2016

• #1

pk910

Hello,

Is it possible to write to unused persistent storage?
According to http://www.espruino.com/STM32F1Flash the Puck doesn't use address 468992 to 479232 (10kB)

but STM32F1Flash.js or poke calls are not able to write to these addresses.
Do I miss something?
• #2

stevie4711

The puck is not an STM processor but a Nordic NRF 52. So I am not sure if what is written there applies to the puck at all...

• #3

MaBe

@pk910 you can use module FlashEEPROM on Puck.js too.

// Tested on Puck.js
var f = new (require("FlashEEPROM"))();
console.log(f);
f.write(0, 'Hello Flash.');
console.log(E.toString(f.read(0)));

/* console log

{
  "flash": function () { [native code] },
  "addr": 471040, "endAddr": 475136 }

Hello Flash.

*/

• #4

Gordon

As @MaBe says you can just use that module - or you can go lower-level and use the flash module: http://www.espruino.com/Reference#Flash

With the flash module you need to be a bit more careful as you can damage the interpreter - however I have tried to restrict access so that you can't destroy the bootloader and 'brick' your Puck

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low level flash access

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low level flash access

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low level flash access

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