32-bit microcontroller IP. The ARM company which designs the ARM cores doesn't make controllers itself, but licences the IP to other manufacturers. ARM is the leading 32-bit controller and is available from tens of suppliers.

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38 views

Trouble holding MCLR line low for PIC ICSP, ICD3 works, hardware defect?

I have an ARM Cortex-M3 that talks to a dsPic33F. I am attempting to do ICSP programming of the attached PIC. I have an analyzer and can see that I cannot control the MCLR line the same way the ICD3 ...
0
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1answer
50 views

MCU Performance: running with emulator vs running without emulator

If I connect to my MCU with its SWD emulator/debugger, is there ANY difference in performance/behavior as compared to when I run the MCU without the emulator? EDIT: I am using a freescale KL25z ...
0
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2answers
107 views

Assembler coding for ARM (Cortex-M0 and M3): is it possible/practical?

Unfortunately there are no questions on Stack regarding ARM and assembler at all. My concern -- is time critical devices. Let's take for an example one of my AVR-based device (program compiled with ...
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1answer
56 views

Will the ADC work with resistive inputs in LPC1796

I'm working with LPC1796 and I have to do data acquisition for my project somebody told me that LPC1796 microcontroller won't work with resistive inputs. What is a resistive input? Is there any way ...
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0answers
40 views

Find the appopriate processor in RF project with 433 MHz frequencies [closed]

I would find the appropriate processor for my project. This circuit has receiver and transmitter which work on 433 MHz frequencies . The transmitter send digital pulse ( amount of data) to receiver in ...
-1
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1answer
78 views

Will ARM replace that older processor architecture? [closed]

I know that those processors with ARM architecture have their advantages, but will it replace those old kind of ones? Or they just will be dealing with different kinds of applications and continue to ...
2
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2answers
432 views

Sublime Text editor to develop ARM-based software

Until this moment I used Atmel Studio to develop software for AVR-based devices. Now I'd like to go to ARM Cortext M. Additionally I'd like to try codesign and version control (I still not experienced ...
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3answers
76 views

Do I need OS for ARM Cortex-M0(3)?

I'm a developer of control devices for switch mode power supplies which need to generate a PWM signal(s) with a frequencies about 100 kHz, measure analog signals, communicate vie USART, make ...
0
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1answer
88 views

Best microcontroller for industrial applications [closed]

I have an industrial project requirement to build a device having this functionality: Store Data Send Data to Web Server Device to be placed under scorching sun Sensors - around 5 A Graphical ...
0
votes
1answer
68 views

SD Card Access Library

I am accessing my SD card using SPI. But I've found this to be slow and I am also sad that when there is a faster protocol already supported by my SD card I am using a slower version. Is there a C ...
0
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1answer
44 views

Change display orientation on ILI9325

I've started to play with a cheap TFT display, called HY28B. It's pretty well known, I guess... Anyway, I want to change the orientation of the display to landscape mode, but somehow it doesn't do ...
1
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2answers
41 views

Why doesn't the MCU's pin go high on time?

I have a STM32F103 and I downloaded this program to it(a simple blink program): ...
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1answer
66 views

Code Security of ARM Cortex M4 MCU

What are the main methods the code inside a certain ARM Cortex M4 MCU (TI LM4F120H5QR etc) can be extracted after deployment? Is it possible to completely stop a third party from stealing the code ...
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2answers
74 views

Uploading C program to the ARM core for execution through ethernet!

I want to write a c code on my local PC and upload it to ARM core on Zed-board for execution. I know we can do it using JTAG, but for obvious reason I want to use Ethernet interface. I will be glad ...
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2answers
62 views

SRAM vs MicroSD

I have very little SRAM in my datalogger (10 kb), so I have to flush my buffer to MicroSD every 0.5 seconds. Would it make any difference in power usage if I added more SRAM (which is very difficult ...
0
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1answer
89 views

ARM Cores Benchmark

I am taking some deep interest lately in the ARM architecture and there are many flavors of ARM out there....ARM7, ARM9, ARM11, ARM Cortex-A, ARM Cortex-M and etc. Are there any benchmarks of all the ...
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2answers
105 views

What would be a good language interpreter to implement into a Microcontroller [closed]

For beginners it is always a problem getting started with microcontrollers. The biggest problem is getting the whole system running and then programming it with C. C is a great language but it has its ...
0
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1answer
56 views

Simple delay functions for TI Launchpad?

In Atmel Microcontrollers, there are simple delay functions such as __delay_ms() and __delay_us() found in ...
2
votes
2answers
152 views

STM32F103, Having trouble nesting interrupts

I'm trying to interrupt into a USART handler from inside an RTC_Alarm handler, but it doesn't work. I have set the NVIC: ...
2
votes
1answer
77 views

Basic idea of color look up table

I'm driving an ILI9230 LCD 320*240 16bit interface, with a framebuffer of 250*200 and I want to drive it as 4bit. so I built a loook up color table like that: ...
0
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1answer
64 views

Selecting external RAM for an ARM static memory controller

So I'm going through the datasheet for a device by Atmel (AT91SAM) and it shows the followings: This SMC is capable of handling several types of external memory and peripheral devices, such as ...
1
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2answers
88 views

Getting an 8-bit LCD display interface to work

I have a LCD which this controller is used with: LCD Single Chip Driver. I am trying to get it to work with an 8-bit interface, but in my kit I can't find the three pins that are mentioned in the ...
2
votes
1answer
99 views

STM32F10x SPI - No Clock

I'm trying to get basic SPI operation working on an STM32F107VC chip using the WaveShare Port107 development board. I'm trying to initialise SPI1 which resides on PA4-PA7. I'm attempting a simple ...
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votes
4answers
148 views

ARM Development tools [closed]

I want to start developing embedded applications on ARM and I am looking into the tools options and honestly it's quite confusing. I am trying to decide on which IDE and debugger I will be using and ...
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2answers
83 views

ARM cancel execution of pre-empted interrupts

I can't seem to find an answer to this in google or the Definitive guide... Is it possible to from one interrupt, cancel the return to any pre-empted interrupts? For example, I have an ISR which is ...
1
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1answer
40 views

What is the danger of using interrupt pre-emption in ARM

I am working on a system which uses about 4 interrupts. I can clearly define a priority from one to the other. For example, I feed SPI transfers with DMA requests and operate a USB interface which ...
0
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0answers
24 views

ROM functions through CMSIS on LPC15xx

I'm playing with LPC1549 uC. I'm using CMSIS library, and I'd like to ask how could I use the ROM functions through CMSIS? Maybe it is a silly question but I'm not sure about it.
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1answer
165 views

USB interface with STM32

I'm experimenting with native USB in STM32. I've not found any "step by step", or a little more well structured tutorial, how to implement CDC or mass storage for example. I've found some examples, ...
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0answers
52 views

Differences between ARM, Cortex-Mx, MCU Manufacturer, Dev Board?

I trying to find out ways to send HTTP requests from a development board (EK-TM4C1294XL) and trying to find libraries and code samples and what not (note: this is not my actual question). I want to ...
1
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1answer
77 views

STM32F102 USB Programming

I am currently designing a board for a STM32F102 chip which needs to be able to use the USB bus to transfer data while the chip is running. However I also want to be able to program the chip through ...
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0answers
53 views

LPC2148 + Eclipse + yagarto + openOCD. Issue with the interrupts

I'm using 'Eclipse-Indigo' + yagarto + 'openocd-0.7.0' setup for a project on LPC2148. I've set up the environment properly. I'm able to compile, link and debug the project. I've configurred Timer0 ...
1
vote
1answer
122 views

Using LPCxpresso with barebones LPC4337 board

I recently purchased a development board on eBay that will allow me to work with NXPs dual core LPC4337 ARM M4/M0 processor. I have experience working with uVison4 from KEIL, for the FRDM-KL25 from ...
3
votes
1answer
92 views

How to connect the power for VREFSD pin and anlog pin in STM32F3273 (ARM Cortex-M4) for SDADC application?

I have an analog amplifier which is powered at single-supply power and have an analog ground of 1.25V. I want to perform sdadc for my analog output. I am using STM32F373 (48pins), which is an ARM ...
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0answers
69 views

Can the Hidden Markov Model be run on an ARM Cortex-M3 processor?

I'm working on an algorithm for a device that utilizes the Hidden Markov Model (HMM) to crunch data and make its predictions. Can the HMM be run on an ARM Cortex-M3 processor running at 32MHz? How ...
1
vote
1answer
97 views

RSBMI instruction in ARM

as an exercise problem in ARM assembly program, I had to convert a number x to its absolute value. now seeing the problem as a simple problem of removing the sign of the respective number, I used BIC ...
2
votes
4answers
309 views

minimal ARM (cortex m0) board

First: I'm not a professional. I just want to know what is possible and if i'm on the right track. Second: I want a little microcontroller which just measures (for example) the temperature and send ...
1
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2answers
60 views

watchdog timer operation

I have read that watchdog timer pushes microprocessor/controller into reset state whenever it experiences any software anomaly like executing in infinite loop. and after some time a very senior prof ...
3
votes
2answers
127 views

Moving code from an ARM M0+ to an ARM M4, what changes?

Say I have a very simple program that functions perfectly fine on a ARM Cortex M0+ processor. How much will I need to change in order for it to work on an ARM Cortex M4 processor, assuming they are ...
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0answers
27 views

winIDEA and iTAG Fifty

I'm currently working on connecting the iTAG Fifty with winIDEA to establish a debugging session with an ARM processor. I followed the steps described in the manual. But if I try to reset the CPU ...
1
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1answer
40 views

What does term “connectivity attributes” mean in AM3359 Cortex A8 processor (used in Beaglebone)?

Please explain the meaning of the term "connectivity attributes" in context of UART in AM3359 processor. I found the term while reading its Technical Reference Manual (TRM). It is not defined in its ...
0
votes
1answer
76 views

GPIO control of alternate function pin

I have an STM32F4discovery and using a pin as SPI CLK. But I also want to be able to control the pin as GPIO to generate ANY frequency I want (STM32 only lets you prescale APB clock). How can I ...
0
votes
1answer
64 views

With LPC1343 (ARM Cortex M3), how to control the the initial state of the MAT output from the timer?

I know that when the timer match the M1, I can let the mat pin to be up, down or toggle. But how to control the initial state of the MAT pin? I'm using LPC1343CodeBase on a port1343 experiment board. ...
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0answers
113 views

Choosing Cortex M3 for beginners [closed]

I looked at this thread already - "How to choose an ARM Cortex M3 microcontroller" However, my question is a bit a different. I want to focus on more of a learner/beginner's perspective. As the ...
1
vote
1answer
151 views

Porting Linux drivers specifically I2C

I am developing an I2C driver for an accelerometer. My objectives (actually it's the restriction I have as per the project guidelines given in my institute): use Linux flavour of operating systems ...
19
votes
4answers
1k views

How to choose an ARM Cortex M3 microcontroller?

Based on my rough requirements of being in the 36 to 72 MHz range, having 16kb+ SRAM, 128kb+ flash, being programmable in C, I have decided that for my application I want to use an ARM Cortex M3 MCU. ...
1
vote
1answer
135 views

CAN communication between two ARM MCU's (LPC2129)

I am trying to communicate between two LPC2129 microcontrollers, one as transmitter and the other as receiver, using interrupts to transmit and receive the message. The transmit and receive ...
0
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1answer
123 views

Why does `RCC_GetClocksFreq` return different results than I expect?

I have a STM32F427 MCU with a 8MHz HSE crystal. I am setting up the clock as follows: ...
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0answers
106 views

What is a Good Dev Board for Learning ARM for an Arduino User? [closed]

Lets start from my background: I am an Arduino veteran. I have played around with a lot of sensors and know a bit about hardware and software. I knew from the start that ARM platform has a lot of ...
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votes
1answer
309 views

How many cycles does an ARM Cortex M0 use to multiply floats?

Actually I have three smaller questions: On an ARM cortex m0: How many cycles does it take to perform multiplication of single precision floats and store them into a float? i.e. x = a*b; Where x, ...
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2answers
85 views

Designing with ARM SoCs [closed]

I want to learn how to design and develop boards for SoC systems (i.e. i.MX from Freescale). This can be real useful to me because there are countless things I could do with the possibility to design ...