Hello everyone,

I would like to know why you are using Cortex-M microcontroller.

Why don't you adopt other microcontrollers such as 8-bit, 16-bit or MIPS or x86?

The background is that I plan to write a special article regarding Cortex-M on the Interface…

Hi.

I wonder how to calculate absolute value of a 32-bit signed integer in C as fast as possible. I saw that there is a FPU instruction VABS.F32, which do that in one cycle (above the floats). I thought, if it is possible to use it also with integers …

I need a configuration to get rid of the spacing between the numbers in a single barcode.

Why the Cortex M4 instruction SMMUL (32 = 32 x 32b) preserves a redundant sign bit and discards one useful bit of information? What could possibly be the justification for such blatant disregard of the ISO/IEC TR 18037 standard Fract format?

I could not clearly understand the alignment issues present in ARM. Sometimes I get BUS ERROR while running an assembly file but don't know how to resolve it. Some of the doubts:

1. Is it better to store registers pairwise or individually on the stack…

Dear colleagues.

I am compiling the Intel TBB in an effort to optimize my code to the Cortex-M53, however, because I was still forced to use GCC 4.9 I'm getting some warning messages about the use of  32bit Thumb Instrucions in IT blocks:

Warning…

I've been reading books on the ARM Cortex-M architecture and as already mentioned in other post, all the books are consistent in saying that the PC points four bytes (Thumb Instruction Set) forward due to Pipeline (prefetch).

Did some testing with…

I need to be able to handle long bitfields as effectively as possible. Right now I need up to 64 bits in length.

Are there instructions to set, clear and test individual bits in one cycle available for some of the architectures? Which? Particularly, will…

Hi,

I have two M0 projects.  The first project has only one assembly file startup.s.  The second project has one assembly file and one C file.  When I checked the memory map file of the second project (shown below), there are some extra object codes included…

I need some indications to begin writing a program.

Write a compare routine to compare 64-bits values , using only two instructions.

Thanks for your indications !

Hello I was curious about which ARM launch/starter board would be best used to create an electronics controller for a 32 bit 3D FDM printer?  I was thinking that I've seen one project for the TI TM4C123G launchpad that might work.  But are there better…

Hi, i have just got a cortex-m0(LPC1114) based dev board. I'm reading about the architecture and instructions. My understanding is that it supports most thumb 16-bit instructions and a handful thumb-2 32-bit instructions. If the processor has a 32-bit…

Hi experts!

I want to use ldr/str or ldm/stm to copy memory not aligned 4bytes.

I know their input address should be aligned by 4 bytes.

but is there any solution to use ldr/str or ldm/stm though src or dst isn't aliged 4byte by modifing following code?…