Lecture 23. Load and Store Instructions

[@milanturk283]

I can finally do my engineering homework

[@sabitkondakc9147]

Thanks Dr. your content made it to my small laptop and I'm really happy with that!

[@Nykrel]

My professor should educate himself by reading your book and watching your videos.

[@suangpi8847]

I'm reading that book and I cannot achieve a thing: variables from the DATA Area don't get initialized in Data memory when I set to READWRITE. When I set to READONLY, they are in Instruction memory (0x0800xxxx) but I want to put variables into Data memory (0x20000000) like the book's examples. I did exactly like the book says but the output is different. Please help me! Thanks in advance.

[@suangpi8847]

I'm trying Figure 3-6 and the Datas (srcStr, dstStr) are not in Data Memory(0x20000000). Actually they're nowhere.

[@suangpi8847]

Now I know the point. The book use startup file of its own edited by Dr.Zhu. But the point is everybody don't have the same Board. For me, I have only Nucleo F4 board. So, please make a video of how to modify startup file for a specific board.

[@embeddedsystemswitharmcort9051]

Hi, Suang, I am sorry for my late response. I am glad that you figured out the solution. If you program in C, the original startup _xxxx.s works fine. However, if you main program is in assembly, you need to use the modified startup. I think if you copied the part I added into the startup file for your board, you will be fine.

[@suangpi8847]

@@embeddedsystemswitharmcort9051 Omg you finally reply me! Thank you very much! I'll try it. Can I get a favor? Can you make a video of the modification of startup files (even if not very detail, just a brief short)? Because I just copy it and don't really know how it works under the hood. And I can't figure them out by my own. Much appreciated!

[@suangpi8847]

@@embeddedsystemswitharmcort9051Edit: Don't worry sir I figured it out :). Thank you very much for your guidance.

[@janekkomorowski9046]

What if you try to store a word in a register that already holds some memory

[@embeddedsystemswitharmcort9051]

You question is unclear to me. What does "holds some memory" mean?

[@janekkomorowski9046]

@@embeddedsystemswitharmcort9051 I’m wondering whether we need to free a memory from certain register before storing memory in it

[@embeddedsystemswitharmcort9051]

@@janekkomorowski9046 When you save a value to a register, the original value will be destroyed. Similarly, when you save a value to the memory, the original data at that memory location is lost. If you want to preserve the original memory value, you need to load it to some register (and maybe save it to a different memory location).

[@banana001]

how can I store a number that I have in register back to memory?

[@Ahl.12]

teşekkürler🙏

[@nimaltd]

Awesome !!!!

[@irena5339]

great video!! super helpful

[@samuaeladnew8983]

Thanks a lot it was helpful

[@gamingpourlespauvres4243]

thank you so much

[@edfrederick3630]

Thanks a lot

[@mohammedanwarbinmuslem654]

❤❤❤❤❤❤

[@FlickShotGamingYT]

So u are using little endian ?