• State Suggested Answer
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 120 subscribers
  • Views 1280 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Manipulate Ram in an LPC4078

Chris84

Hello together,

I have an LPC4078. I made measurements with it and everything goes into the RAM. Now I want to manipulate the RAM. Is there a pointer for that? Is the any other possibility?

Thank you and greetings

Chris

  • 0 Arm Employee Badge

    Hi Chris

    My name is Stephen and I work at Arm.

    Glad to hear you are making progress with your Cortex-M4-based project.  Are you using Arm Development Studio?

    I'm not sure what you mean by "manipulate the RAM".  Please can you explain what you are trying to achieve?

    Stephen

  • 0 in reply to Stephen Theobald

    Hey Stephen,

    I just saw that I am in the wrong forum. No I don't use the Arm Developement studio.

    I want to alter what is written in the ram or move it from one point to another. Basically I am searching for the pointer which one I can do that. Or is that not possible?

    Thanks in advance.

  • 0 in reply to Chris84

    Pointers are just numbers.

    uint32_t *src = (uint32_t) 0x20000000;
uint32_t *dst = (uint32_t) 0x20010000;
uint32_t temp = dest[100];  // save original dest word 100
memcpy(dst, src, 32768); // copy 32k bytes from start of RAM to later in RAM.
dest[100] = temp;  // restore that one word to old value

    I believe that all Cortex-M processors have their internal RAM at 0x20000000.

    You must of course be careful not to overwrite RAM that is already in use by other code.