Dynamic Buffer allocation

[ahmdm]

Hi,

I wanted to setup a dynamic buffer but I don't have any leads on how to set it up.

Basically, i want to store a stream of data every time it is recorded and then send it over BLe. If a particular stream of data has not been transmitted over ble i want to store it till it isn't sent over while not losing the previous stream of recorded data. 

I was thinking of vectors but I can't set it up on keil Uvision/ using the nrf52832 DK (pca10040) or is there any other way?

I could really use some leads right now.

Thanks.

[awneil]

Why do you want a dynamic buffer for that?

A Ring Buffer would do the job ...

ahmdm said:

I was thinking of vectors

That's a C++ thing ...

[ahmdm]

A ring buffer has a fixed size no? 

How am I suppose to use that in my application?

[awneil]

Yes, but you only have a finite amount of memory anyhow.

You have to fix the heap size at build time anyhow.

So, whatever way you do it, you are going to have define that maximum amount of data you can ever have buffered.

Dynamic allocation brings a number of issues and overheads ...

[ahmdm]

So i like declare a buffer N times the size of my data frame so that it can store a data frame upto N times and then send it over BLE?

[awneil]

Yes - that's the idea.

Are you familiar with the concept of a Ring - aka "Circular" - Buffer?

en.wikipedia.org/.../Circular_buffer

[ahmdm]

Yes I am .just wanted to confirm as I was thinking of some other approach .

Had this in mind before though 

Thanks for your help .

[Alanarf]

Hello, 

could share how you do it? 

pls