8 replies to this topic

[Gaumerie]

Here's a librairy with functions to use the timers of the processor...
I think everything is explained in the header file.
To link a librairy on DevC++, just put

-library=directories...\myFile.lib

in the case "Linker" of Project->Project Options->Parameters

Here's the link
http://orwell01.free...3Timers_Lib.zip

For any question or opinion tell it me...

Alexandre

[Kilburn]

Very good!

But I asked you several times how you made these functions. Can you tell me now? I have a lot of projects (I am programming a sort of snake game taken from TI-89 games, where you can turn in all directions, and I need assembler functions to draw the snake because it is too slow in C++).

[Gaumerie]

If you arrive to add me to your contacts msn, I could give you many things about it...
Now I've just find how to use the interruptions...I'm working on it!
Alexandre

[Kilburn]

If you arrive to add me to your contacts msn

But I added you!!! And you use Hotmail, so I must go to the site www.msn.com, no?

[Orwell]

But I added you!!! And you use Hotmail, so I must go to the site www.msn.com, no?

Go to http://messenger.msn...Xp/Default.aspx and click the "Download" link!
Then run the installation and launch the program

If you don't want to install it, use the online version:http://webmessenger.msn.com/

[Gaumerie]

I arrive to control interrupts sent by processor timers...
I've made a library tu use easier them...
And with them and the direct control to the screen memory (not the VRAM), I arrive to make "grayscales"...but this is not yet the best as g100
I make still a library for grayscales and I put all these things to download...

Alexandre

[SoftCalc]

I arrive to control interrupts sent by processor timers...
I've made a library tu use easier them...
And with them and the direct control to the screen memory (not the VRAM), I arrive to make "grayscales"...but this is not yet the best as g100
I make still a library for grayscales and I put all these things to download...

Alexandre

I don't know how you are doing the grayscale. I assume you are using an interrupt to cycle through each bit plane. One method is to copy all the bits for each plane into VRAM. A quicker and better method (if it is possible) is to have fixed buffers for each plane and simply changing the address used for VRAM (no bit copy needed).

I don't remember, does the ClassPad have the ability to change the address used for VRAM? If so, this is the best method.

[Orwell]

I don't remember, does the ClassPad have the ability to change the address used for VRAM? If so, this is the best method.

Well we were supposing that you knew the answer of this question

But actually I think that the best way to create real grayscales should be to configure the screen's DMA Controller to use 2 video buffers alternatively, instead of one; this way the switch operation will occur between each actual refresh of the screen, and this should make a nice and smooth result.
However, configuring the DMAC is impossible if we don't know its exact references and its corresponding ports on the ClassPad

When one writes something in the "VRAM" one's just actually writing in PEG's internal buffer; and the changes get visible only after the transfer from this buffer to the real video memory (where the DMAC gets the data it needs)... There is a "hidden" function to do this (which code should be known thanks to Gaumerie's work), and I suppose that we implicitely call this function during the call of EndDraw() on a currently visible PegThing.

This means that duplicating the "VRAM" is useless if we do not duplicate the real video memory and make the screen switch automatically between each plane; otherwhise for each cycle we would still have to transfert the content of the current buffer to the video memory, and this could greatly slow down the execution of the program

[Gaumerie]

I don't use the VRAM, because this is just a intermediate buffer...
I make an interrput that is called at a certain frequency and several buffers...
Each time the interrupt is called, i copy the next buffer directly to the screen...
I know that is not the best way, but I think that until we can use the way of julien, I should be great...
I use a frequency of about 69hz...because when this is more or less, the result is not good...
I will try to make an exemple when I will have time...

Alexandre