I am just starting out developing with ARM and am really enjoying learning about these processors. I have a few questions that have been on my mind as a newbie that I'm hoping some people can answer.
From my understanding, the ARM cortex m0 series…
I am just starting out developing with ARM and am really enjoying learning about these processors. I have a few questions that have been on my mind as a newbie that I'm hoping some people can answer.
From my understanding, the ARM cortex m0 series…
I am using the Cortex M4 with CMSIS 5.4.0 DSP library. I'm using the arm_rfft_f32() function and the max_arm_f32() function to compute the maximum frequency bin of injected pure sine wave with an external CODEC. SSI0 and uDMA are being used to take in…
I've inherited some XDMAC code and no one that wrote this code really seems to be able to explain anomalies that I am seeing. So, I'm trying to understand just the basics in an attempt to make sure it was written correctly in the first place. Here we…
Hi, my app (cortex m3) needs to set up a breakpoint directly from code, in order to jump to an interrupt when an instruction from a certain address is fetched. This WITHOUT using a debugger.
Any hint or tutorial? I think the only possible way is the patch…
Hello everybody,
As the senior expert I have worked with ATMega2560 so much, but I have to choose the ARM micro-controllers for my new projects.
I have also read a lot about ARM7TDMI,focusing on how to write SWs with Keil...but I haven't had any practical…
I have some confusions about the difference between write back + write allocate and write back + write no allocate on Cortex CM4.
As my original understanding:
Hi
I am compiling below assembly language code for ARM Cortex M4 using IAR Workbench and getting error, could some one help me on this. calling BadWebConfig_Txt from C code.
#define code_ADDRESS(a) ((a)>>24 & 0ffH,(a)>>16 & 0ffH,(a)>>8 & 0ffH,(a) & 0ffH…
Can any one tell me what is the Buffer Depth of UART in Arm cortex M7 processor.
Many implementations on Cortex requires true random number generation.
It is very common to use seed based on the tick counter and then rand() function which is "just" a constant fixed known function.
However, if after each reset, application…
Hi All, My Question is related to CMSIS DSP Library. i'm working on ADuCM3029 EZ-KIT. I'm using IAR v7.8.1 to build the project. In my application i have an ADC interfaced with the controller, from which i acquire 60 samples and stores it into the buffer…
Dear Mrs. /Mr.
We are a company that manufactures traffic light systems. Our RnD department is in the designing process of a traffic light controller (TLC). The basic operational bloc diagram of the system is shown on the following figure:
As you can…
Hi,
Does ARM make available optimized routines for RGB/YCbCr conversions (e.g. RGB16/RGB888 to YCbCr 4:2:0 and 4:2:2) on Cortex-M7 (e.g. using SIMD instructions and intrinsics)?
(and in general, is there such an optimized library for DSP and image processing…
I'm looking to start a new design based on the ARM Cortex-M7 and have been reading thousands of pages of documentation ( not done yet of course ). I am able to design my own schematics and PCBs so I'm trying to first determine the very bare minimum to…
Can the DAP cause exceptions by performing illegal instruction in spaces protected by MPU or is it immune?
Trying my hand at setting up MPU but I cannot get it to fire - thought it might not be possible with DAP.
Thanks, Tom
Hi , I am New to this Community
I am Studying now Cortex-M3 .. I am reading Joseph Yiu book...
I am Confused in the part of the instruction set , and I couldn't get the following:
as i understand that some of the original ARM 32-bit instructions are…
Hi,
I have configured my M4 based CC3200 from TI to output printf via ITM (all uarts used). Works great as long as the debugger is connected. But when I boot up with no debugger it streams out unrecognisable packets. The normal packets are one header…
Hi.
Currently. I'm trying to understand about system memory in cortex m3 address map.
most examples are said "there are 2 area such as 0x08000000 Flash memory area and
0x1FFFF000 System memory area.
and I understood that Flash memory area is saving…
I have been given the task of selecting a suitable processor for a project in which we will have a dedicated processor.
The project will involve configuring HW and inverting matrices in C. We will use the Cholesky algorithm in double precision. We don…
HI.
I'm trying to understand the relationship between UART and printf within retarget.
as I understand, retarget supports to implement low level function fputc, if I want to use printf().
if I am right, I can't still understand the relationship between…
Over the past few months I've been doing a lot of work on a Kinetis K24 processor, which is a Cortex-M4, running the MQXLITE RTOS. It also has a couple other SDKs built in and a surprising level of complexity for a CM4 application. What all that leads…
Hello,
As part of my diagnostic regime I wanted the diag to halt when completed. It doesn't seem like it can. It seems to keep running when I
CoreDebug->DHCSR = (0xA05FUL << CoreDebug_DHCSR_DBGKEY_Pos) | CoreDebug_DHCSR_C_HALT_Msk…
Hi,
On Cortex M33 , i am trying to check software interrupt functionality. Below is the CMSIS APIs i used. Note that the CPU is in secure world and secure VTOR is being configured.
Also, ITNS config for this line is set to secure.
NVIC_SetPriorityGrouping…
Hello all!
So I'm working on a development with a Cortex M4 and there is something i don't understand, I was hoping someone could help clarify this:
This is the code I' using
(Assume R3 content is 1, R6 R8 the address needed to set PIN1, and…
Hi I was studying the memory system ... and I found three related concepts/topics but I couldn't grasphow these concepts are related to each other and to the AMBA Protocol ... these concepts are : - memory Type - memory Attributes - Monitors and semaphores…
Hello,
I have a question regarding Memory protection unit on Cortex M4 (STM32F3 MCU). This is pretty simple single core MCU without caches. I implemented MPU based on instructions in Definitive guide to the ARM Cortex-M4. It is stated there that the bufferable…