Debug Connection Error in ARM development studio

Hi again

There are various reasons why the debugger might be unable to read the memory/peripheral at that addresses, for example:

* the peripheral might be powered-down

* the peripheral might need to be explicitly enabled before use

* the MPU might be blocking access to that address

* the memory/peripheral might be inaccessible/disabled for the current processor mode or security state (e.g. some memory/peripherals are only accessible in secure state)

* the memory/peripheral might require a certain access width, e.g. 8-, 16- or 32-bit access.
For example, to read a word with a 16-bit (LDRH) access, you can use:
x /w <width=16>:0x60000000

You'll need to check the specification for your target to investigate what might be preventing the access.

Stephen

Hi again

There are various reasons why the debugger might be unable to read the memory/peripheral at that addresses, for example:

* the peripheral might be powered-down

* the peripheral might need to be explicitly enabled before use

* the MPU might be blocking access to that address

* the memory/peripheral might be inaccessible/disabled for the current processor mode or security state (e.g. some memory/peripherals are only accessible in secure state)

* the memory/peripheral might require a certain access width, e.g. 8-, 16- or 32-bit access.
For example, to read a word with a 16-bit (LDRH) access, you can use:
x /w <width=16>:0x60000000

You'll need to check the specification for your target to investigate what might be preventing the access.

Stephen

Hi Stephen

We realized it was the problem that you mentioned (peripheral might need to be explicitly enabled before use), and the issue is solved now.
Thank you and Ronan for your kind cooperation.

Thanks for letting us know.
If you could mark this thread as Answer Accepted, that'd be appreciated.
Hope your product development now continues smoothly.

Stephen

Thank you Stephen and Ronan;
I already did that for all the conversation.

Just two thing that I really appreciate to know.

1. Is there a command to see the clock speed of my CPU. Since this CPU is not commercialized, I could see small adjustments in the design. I wanted to make sure what the highest clock is.

2. I want to investigate about the memory as well, I want to know the size of ICTM and DTCM, and if there is any other memory designed for the CPU. 

Than you in advance for your kind cooperation.

Hi again,

Sorry, the debugger is not able to show you the clock speed of your CPU.  You'll need to ask your hardware designers for that information.  But you can set the JTAG clock from within the debugger.

The ITCM and DTCM sizes can be read from the CM7_ITCMCR and CM7_DTCMCR.  See:

developer.arm.com/.../instruction-and-data-tightly-coupled-memory-control-registers

The debugger is not able to work out for itself what other memory might be in your system, though you might be able to probe for working memory using the Memory view.  But again, best to ask your hardware designers for that information.  

Hope this helps

Stephen

Hello!
Thanks again.
Appreciate your kind cooperation.

Hi again!
When we used malloc of size 2**15 in C code, it does not allocate.

uint16_t *out = (uint16_t *)malloc(samples_size * sizeof(uint16_t));
if (!out) {
fprintf(stderr, "Memory allocation for out failed.\n");
exit(1);
}
unsigned int samples_size       = 1 << 15;

Our DTCM 256kb and also ITCM is 256kb.

CM7_DTCMCR
x 0xE000EF94
0xE000EF94: 0x00000049

CM7_ITCMCR
x 0xE000EF90
0xE000EF90: 0x00000049

It seems that I cannot use all 256kb that I have in DTCM.
Can you give me insights through this?

Please create a new thread for a new question so others in the community can assist (as well as find answers).

Malloc() will use the heap to allocate memory. Where have you located this (via scatterloading region ARM_LIB_(STACK)HEAP)?

Thank you for your answer, I could not find any documentation regarding this issue, but I created a new thread here:
Memory allocation Issue

It would be appreciated if you help me there.

Warm regards

Mehran