Flash and RAM access

RE: Flash and RAM access

awneil — Thu, 04 Mar 2021 09:24:48 GMT

[quote userid="6462" url="~/f/nordic-q-a/72339/flash-and-ram-access/297689#297689"]If you want "STORAGE_ADR" to be an address, it would be better to define it so that it is an address[/quote][quote userid="101728" url="~/f/nordic-q-a/72339/flash-and-ram-access/297702#297702"]

Why is that?

[/quote]

A fundamental principle of good software design is that the names you give to things should be descriptive, accurate, etc.

So, if you give some a name like "STORAGE_ADR" - which suggests that it is an address - then it really should be an address.

Also, if you're going to have a definition like that, why not make it complete? Why have to keep remembering to prefix it with (uint8_t*) ?

[quote userid="101728" url="~/f/nordic-q-a/72339/flash-and-ram-access/297702#297702"]Just wanted to know whether it's possible[/quote]

Possible, yes - advisable, no!

😉

RE: Flash and RAM access

GOAA — Thu, 04 Mar 2021 09:09:46 GMT

Thank you for your response,

[quote userid="6462" url="~/f/nordic-q-a/72339/flash-and-ram-access/297689#297689"]it would be better to define it so that it is an address[/quote]

Why is that?

[quote userid="6462" url="~/f/nordic-q-a/72339/flash-and-ram-access/297689#297689"]

Why?

The whole point of having named variables is exactly so that you don't have to keep dealing directly with magic number addresses!

[/quote]

I am just trying to experiment simply. I have previously used C but want to get into a more lower level context, that's why I am trying to do this. Just wanted to know whether it's possible or not xD

RE: Flash and RAM access

awneil — Thu, 04 Mar 2021 08:47:54 GMT

If you want "STORAGE_ADR" to be an address, it would be better to define it so that it is an address; eg,

#define STORAGE_ADR (uint8_t*)STORAGE_ADR

[quote userid="101728" url="~/f/nordic-q-a/72339/flash-and-ram-access"]Or should the hexadecimal be converted into decimal before I feed it into the pointer[/quote]

The number base is immaterial - the value is the same whether you write it in hex, decimal, or octal.

[quote userid="101728" url="~/f/nordic-q-a/72339/flash-and-ram-access"]I am going to use pointers to write in RAM as well[/quote]

Why?

The whole point of having named variables is exactly so that you don't have to keep dealing directly with magic number addresses!

This is the compiler's job.

[quote userid="101728" url="~/f/nordic-q-a/72339/flash-and-ram-access"]I am new to Embedded C programming[/quote]

Do you have any experience with C in any other context(s) ?

If not, I would strongly recommend that you don't try to learn the language on a microcontroller: you will have a far more comfortable learning experience on a PC - away from all the added complications & restrictions of embedded microcontrollers.

I would especially not recommend learning on an nRF (or any other) radio SoC - as that adds a whole bunch of other complications!

😮

Here are some 'C' learning & reference materials for you:

https://blog.antronics.co.uk/2011/08/08/so-youre-thinking-of-starting-with-c/