• file compression with cortex M4

    Brun Charly
    Brun Charly

    Hi

    I'm using a kinetis K64 cortex M4 with FreeRTOS and I need to compress files on a SD card. I have 100-150ko free Ram.

    Do you know a library for this ? I found only solutions with 1Mo minimum RAM requirement.

    It's csv files. I have a lot of time available…

    • Answered
    • over 4 years ago
    • System
    • Embedded forum
  • FFT C-File

    Jochen
    Jochen

    Hello everybody,

    im using the Math.h file to do a rfft with 1024 points und q15 datatype.

    So far everything works fine, and I get good results. It needs a computation time of ~720us on my CortexM4 @100Mhz.

    This is very Impressive, but to long for my application…

    • Answered
    • over 4 years ago
    • System
    • Embedded forum
  • Cheap alternative of J-Link Segger

    Horaira
    Horaira

    I am looking for some alternative of J-Link Segger for Cortex-M3/4 , the cheapest one is J-Link Base as J-Link Lite can be used only with evaluation boards, 

    Any suggestion ?

    I am using GNU arm gcc as toolchain and debugger and Eclipse as IDE, I…

    • Answered
    • over 4 years ago
    • System
    • Embedded forum
  • ECG, Wavelets and Cortex-M4

    Carlos Delfino
    Carlos Delfino

    Hello
    First of all a successful 2017 for all of us.

    I'm looking for examples of C algorithms for applying the concept of wavelets to identify ECG patterns in data collected with a Cortex-M4, preprocessed and later sent to a Cortex-A for graphical re-ordering…

    • Answered
    • over 3 years ago
    • System
    • Embedded forum
  • Best version tracking tools for embedded software?

    Andrea Bettati
    Andrea Bettati

    Hi to you all, I'm working on a software involving an LPC4370 (Cortex M4 + 2*M0) and LPCXpresso IDE. I'd like to know if someone knows a good version tracking tool for the platform.
    My key requisites are:

    • free/cheap for smal teams
    • integration…
    • Answered
    • over 3 years ago
    • System
    • Embedded forum
  • ethernet mac address

    karthik dharma
    karthik dharma

    i am looking for a ethernet connection for my pump. which i am using a stm32f discovery board. for this i need a mac address. how can i get an mac address and how can i interface with the pump and control with my pc. can you all please guide me.

    • Answered
    • over 3 years ago
    • System
    • Embedded forum
  • ethernet connection program stm32f4 discovery board

    karthik dharma
    karthik dharma

    Hi,

        I am doing my pump project using stm32f407vg controller. I want to control my device through pc. where i have developed a .NET software for various parameters. through that i want to control the device through ethernet. how i can i control the device…

    • Answered
    • over 3 years ago
    • System
    • Embedded forum
  • regarding pwm issue in stm32f4 discovery board

    karthik dharma
    karthik dharma

    hi all,

       i am using the stm32f4 discovery board to drive my stepper motor in the rpm of between 0.001 to 500 RPM. for this i am using pwm. my clock frequency is 32MHZ and prescale for ABP1 is divided by 2 of my clock frequency. in this i cant make my…

    • over 3 years ago
    • System
    • Embedded forum
  • Can I use LAPACK with Cortex-M4?

    Michelle Tseng
    Michelle Tseng

    Hi, everyone!

    I'm a beginner of  cortex-M4 developing which the student of master degree.

    Actually, I implement the algorithm model on cortex-M4 platform now, including calculation of eigenvalue and eigenvector.

    I have found the LAPACK library which…

    • Answered
    • over 3 years ago
    • System
    • Embedded forum
  • Value of "__initial_sp"

    niekiran
    niekiran

    Hello , 

    I am new to ARM cortex M processors and while doing some coding on my board using KEIL  i found that

    at location 0x0000_0000 my debugger shows the value "0x2000_0660" . Thats the value of the MSP loaded. 

    but i really dont understand how…

    • over 2 years ago
    • System
    • Embedded forum
  • TRACEDATA Capture issues

    Dave Marples
    Dave Marples

    Hi there,

    I am the author of the open source Orbuculum tools for SWO data parsing on CORTEX-M targets. I am currently expanding those tools by implementing 1, 2 & 4-bit parallel TRACEDATA capture from CORTEX-M3/M4 CPUs using a small FPGA connected to…

    • Answered
    • over 2 years ago
    • System
    • Embedded forum
  • ARM cortex M4

    Loay
    Loay

    Which Linux version used for ARM cortex M4 ?? and how to install this linux version on TDA3x from Texas instruments ??

    • Answered
    • over 2 years ago
    • System
    • Embedded forum
  • Where is M4 hardware breakpoint address?

    ctc8631
    ctc8631

    Hi I'm learning cortex m4 debug feature, 

    I'm using stm32f407 discovery with openocd in ubuntu

    I'm trying to understad breakpoint feature,

    I can set breakpoint address in openocd and chip will stop when pc run to that address

    like main function…

    • over 2 years ago
    • System
    • Embedded forum
  • How can I force a Usage (instruction) exception in cortex m4

    Owain
    Owain

    I want to test all my exception handlers; but have so far failed miserably at forcing a usage exception.

    I tried disabling FPU and running a FPU instruction, but this resulted in HARD Fault rather than USAGE Fault.

    Anyone know a good way to foce such…

    • over 2 years ago
    • System
    • Embedded forum
  • SAM4S Bootloader Jump Address Offset

    cSmout
    cSmout

    Hi everyone, 

    Apologies for asking a very similar question to those that are out there already, but this is my last hope as I have scoured Atmel and arm forums for a solution that works for me, but not found any yet,

    I am trying to write a bootloader for…

    • over 2 years ago
    • System
    • Embedded forum
  • Atmel SAM4E Bootloader/VTOR executing new application

    Paul Maddox
    Paul Maddox

    I've written a boot loader for the Atmel SAM4E device which is working to a point, it can receive new application code via SPI, erase flash and write to flash, but I don't understand how to execute the new application. I've learned the VTOR can be relocated…

    • Answered
    • over 5 years ago
    • System
    • Embedded forum
  • DSB command for external Nor-Flash memory (Cortex-M7)

    NikolayRU
    NikolayRU

    Good afternoon, dear collegs! 

    I'v started to connect STM32H7 (Cortex M7) MCU with exteranal Nor-Flash memory by use FMC. I'm alittle confused by write command. Without DSB() command it refuses to work correct. Program loads from embedded Flash (7 waitstaits…

    • over 2 years ago
    • System
    • Embedded forum
  • ARM Toolchain/Linker support for External RAM on EBI Interface

    Ritesh Prajapati
    Ritesh Prajapati

    Hi,

    We are working on ARM Cortex-M4 (Nuvoton NUC472) based SoC as per our requirement and we need support to set specific object (.o) or specific
    library file (.a) into specific section into External RAM on EBI Interface.

    So, Would you please provide…

    • over 1 year ago
    • System
    • Embedded forum
  • ARM Cortex-M4 (Nuvoton NUC472) not booting with External RAM on EBI Interface

    Ritesh Prajapati
    Ritesh Prajapati

    Hi,

    We are working on ARM Cortex-M4 (Nuvoton NUC472) based SoC as per our requirement.We are facing one critical issue like board is not booting when we enabled and used extrenal RAM on EBI.

    We have ported following BSP package with below toolchain for…

    • over 1 year ago
    • System
    • Embedded forum
  • Cortex M4 L1 data cache policy

    nothing
    nothing

    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:

    • For write back with write allocate:
      • If write-address isn't cache hinted yet, cache line…
    • Answered
    • over 3 years ago
    • Processors
    • Cortex-M / M-Profile forum
  • IAR Compilation error

    myself_subhash
    myself_subhash

    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…

    • Answered
    • over 3 years ago
    • Processors
    • Cortex-M / M-Profile forum
  • RNG (Random) on Cortex-M4

    Amir
    Amir

    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…

    • Answered
    • over 3 years ago
    • Processors
    • Cortex-M / M-Profile forum
  • CM4: Is DAP immune to MPU protections?

    SysTom
    SysTom

    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

    • Answered
    • over 3 years ago
    • Processors
    • Cortex-M / M-Profile forum
  • Problem with SWO when debugger not connected

    ciaranmac
    ciaranmac

    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…

    • over 3 years ago
    • Processors
    • Cortex-M / M-Profile forum
  • Where to find the execution cycles of Cortex m7 instruction

    tyskin
    tyskin

    for Cortex-M0, M3 and M4, I can find the execution time in their Technical Reference Manual > Programmers Model > Instruction set summary 里面查看

    http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0432c/CHDCICDF.html

    but for M7 It said that…

    • over 3 years ago
    • Processors
    • Cortex-M / M-Profile forum
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