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Questions tagged [arm7]

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0
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1answer
31 views

ST STM32H743XI (ARM M7 based) MCU - ADC Configuration

I am using the ST STM32H743XI (ARM M7 based) MCU, I want to use the ADC to measure 7 Hall sensors (use both slow and fast channels), i need the conversion time for all seven ADC channels to be the ...
0
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0answers
12 views

Can anyone Explain me why nVICFIQIN is taken as input and ORed with FIQSTATUS and the output is negated to produce nVICFIQ

I am trying to learn VIC in Lpc2148. As you can clearly see the arrow in the picture. The nVICFIQIN is given as input to a OR gate and is ORed with FIQSTATUS register the result is then negated and ...
1
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1answer
92 views

Breakpoint Alters PIO Interrupt Behavior - ATSAMV71

So I'm baffled by this... I'm working with an ARMv7-M microcontroller and GCC compiler, debugging some code where I'm trying to enable an interrupt. I'm trying to do the following: enable an ...
0
votes
1answer
139 views

Interfacing an LPC2148 with a CAN module

I need to implement the CAN protocol to communicate between two LPC2148s. Now I am planning to use SPI for communication between a microcontroller and a CAN controller and then the CAN protocol for ...
0
votes
1answer
57 views

ADuC702x MCU bandgap voltage reference question

I have recently started using the ADuC702x MCU family. I plan on using the analog to digital converter that comes with the MCU. The datasheet states that there is an internal 2.5V that it uses for ...
0
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3answers
102 views

IT TTT block in assembly language

Why do we have four instructions in IT block for Cortex M4 processor? Is it related to the fact that we have three pipelines for ARM assembly instructions?
1
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2answers
1k views

How to set up Keil Logic Analyzer to read specific pin?

How can I set the Keil uVision 5 Logic Analyzer so that I can read the status of a specific pin, example high or low? I have read the official docs here, however it does not say anything of the sort. ...
1
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2answers
336 views

Control different functions using the same push button. ARM 7

I am trying to implement a small piece of code, and can basically be simplified to the following. I have three different LEDs (say P0.0, P0.1 & P0.2). I have one push button that when pressed ...
1
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1answer
106 views

Countdown Timer on Switch Input ARM 7

I have been trying to create a countdown timer using ARM7 micro-controller, once an switch input has been detected. So far I managed to create a delay function of 1 minute, and detect a switch input. ...
1
vote
1answer
159 views

Is the configuration in startup.s file generated using KEIL IDE directly putting the Fcpu @ 60 MHz?

I am using LPC2148 for learning purpose and I was trying to mess around a lil bit with the startup.s file and understand it. In the Keil's Target option for the project it is assuming the XTAL ...
0
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3answers
551 views

Detecting Switch input in ARM 7 and multiplexing two seven segment displays

I am trying to multiplex two seven segment displays, once a switch input is detected. If a switch is pressed then the seven segment displays should show 1 If ...
1
vote
2answers
552 views

Interfacing Switch Input with Seven Segment Display using ARM 7

I am trying to detect a switch input so that, if the switch is pressed, a number is incremented on the seven segment display. For example if the seven segment display shows ...
1
vote
2answers
254 views

Multiplexing 2-Seven Segment Displays using ARM 7

I am currently trying to control two seven segment displays from the same 7 pins (P0.0 - P0.6) of an ARM 7 micro-controller. I am first testing this on Proteus simulation software. I am following ...
-1
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3answers
66 views

systick eqvivalent in pre cortex arms

I'm building a library for at91sam7x, wich is a arm7. I need a delay timer, but there is no systick, i found several mentions of system timer but nothing usefull. Is there a way to generate delay, ...
0
votes
1answer
798 views

ARM7 Memory model (Flash, SRAM, registers. …) [closed]

I ma newbie in ARM world. I am have basic background working with AVR controllers. AVR has separate physical memory blocks (like EEPROM, FLASH, Data). It is very ...
0
votes
1answer
128 views

Why did my Gameboy shut off during takeoff? [closed]

When I was young I remember playing my Game Boy Advanced SP in the airport terminal. When we boarded we were asked to shut off all electronics. I was setting a high score in Pokémon Pinball: Ruby &...
6
votes
3answers
3k views

How to decode ARMv7 instructions?

I'm trying to understand ARM instruction encoding. The following image shows C code along with its corresponding assembly instructions: I looked at the ARMv7 reference manual. However, I couldn't ...
0
votes
1answer
8k views

Minimum Requirements of a microcontroller to run embedded Linux? [closed]

I am looking for the cheapest microcontroller to run embedded Linux. what should I be looking at, which class of microcontrollers or microprocessors is compatible? is there a minimum system ...
6
votes
2answers
3k views

DHT21 / AM2301 sensor not measuring humidity

I am trying to use a DHT21 with a Lamobo R1 aka Banana PI R1 to read temperature and humidity, with Armbian/Jessie and a 4.5.2 kernel. A Lamobo R1 is basically an A20 board raspberry pi compatible, ...
0
votes
1answer
80 views

Cortex M0 or M3 serial interface to ARM7

I have worked on ARM7 controller (LPC2138) for my application. But now to add NFC module I am using LPC1227 controller along with NFC chip. ( Both dies in single package ) Now, if I want to ...
0
votes
1answer
124 views

USB enumeration problem, cannot reply on request

I program with LPC2368 on ARM7 architecture and will configurate usb coonection with my pc. After initialization periphery and clock, i try to start usb. I am using the following scheme fro pull-up ...
0
votes
1answer
656 views

Cannot transmit message (receiving is working, but without ack) on CAN bus (LPC2368)

I work with microcontroller LPC2368. After initialisation of the CAN interface to normal mode (not listen-only mode), I can receive all messages, but the microcontroller cannot send an acknowledge ...
1
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2answers
619 views

Unnecessary (?) loading PC register with following instruction's address in ARM

I'm trying to comprehend the assembler starting code for my ARM7TDMI processor. I Got most of it, but there's one thing that bothers me. I found this line: ...
1
vote
1answer
74 views

How to populate unused flash for an armv7a processor?

I have a decision on how to fill unused memory in a flash device. I've heard of populating with reset instructions as a safe way to handle rogue pointers, etc. Is there a concept of an assembly ...
2
votes
1answer
2k 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 ...
2
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1answer
1k views

Purpose of ARM Linker Files

I would like to know what is the purpose of ARM scatter file and ARM Linker address MAP file ? How do they help in compilation and eventually during loading of the executable ?
0
votes
1answer
348 views

CAN communication with the SM470R1B1M-HT microcontroller

I bought the IAR Kickstarter kit to work with the SM470R1B1M-HT (Texas Instruments) microcontroller. I would like to implement CAN communication between the microcontroller and a PC. I need to send ...
1
vote
1answer
1k views

SAM-BA monitor problem

I tried SAM-BA monitor for atmel at91samxxxx chips I'm working with non-atmel board using at91sam7s128 , I tried the monitor program with board option : at91sam7s128 and noboard but neither of them ...
4
votes
2answers
6k views

Driving LEDs directly from microcontroller pins

In the circuit I'm designing, I'm using an at91sam7s128 which is a micro-controller with an ARM7 core. Its PIO0 to PIO31 provide 8mA max which is low to handle direct driving of LEDs like this: ...
1
vote
1answer
589 views

ARM LPC2148 Bootloader filesystem problems

I installed Keil's LPC2148 bootloader on my ARM board and as indicated in the docs my PC is able to identify it as a mass storage device. However, the bootloader uses FAT16 filesystem which is ...
5
votes
1answer
477 views

i2c on different logic level devices

I'm having a problem making LPC2148 work with SRF10 sensor. LPC is 3.3v device with 5v compatible i2c (at least user docu claims that). On the other side there is SRF10 device which is 5v. I have ...
-2
votes
2answers
742 views

Small device that runs Linux [closed]

I want to make a small device that boots Linux off of an SD card for ARM or x86. I am trying to build this from scratch. I downloaded Linux (kernel.org) and compiled it on Ubuntu. What kind of SD ...
4
votes
3answers
4k views

Program only runs when debugging in GDB - using Open OCD and Olimex arm-usb-ocd-h jtag to program at91sam3su

I'm trying to make my Atmel at91sam3u cortex-m3 arm chip make an LED blink. I have a Olimex ARM-USB-OCD-H jtag programmer, and I'm using Open OCD running on OS X to program my chip. I'm using the ...
3
votes
1answer
194 views

Pinmode register in lpc2468

Will a PINMODE register in lpc2468 affect the status of an input pin i.e can we enable an internal pull up for an input pin,or it is only possible for output pins.
2
votes
2answers
403 views

Write back buffer in lpc

I was reading the Lpc2148 Manual and in the Static Ram section I came across Write back buffer The SRAM controller incorporates a write-back buffer in order to prevent CPU stalls during back-to-...
2
votes
2answers
2k views

sending data over bluetooth to my hardware through a matlab serial GUI

I have a hardware with RN-41 bluetooth module and the lpc 214 arm microprocessor.Currently my device only sends data to the PC and I am trying to configure it to be able to receive some commands over ...
-2
votes
1answer
197 views

Assembling ARM computer [closed]

I want to assemble my own mini-computer with ARM processor, but I don't know the start point I must to start. Can you advice me some articles or other sources where I can read something about that? ...
2
votes
1answer
188 views

Sparkfun's Uberboard HELP

I bought the Sparkfun's Uberboard a while back and I was trying to run the "Bootloader Tutorial" I followed all the instructions, got the FW.SFE file, but when the Uberboard resets it does not load ...
2
votes
1answer
158 views

How to Debug in APM

I am using Arm Project Manager (APM) for writing the firmware in my ARM board. My question is: What are the live debugging features available in APM? Let's say I need to inspect the value at some pin ...
2
votes
1answer
204 views

Which board is better overall for .net mf development, the Tahoe 2 or the GHI EMX module?

Which board is better overall for .net mf development, the Tahoe 2 or the GHI EMX module? Tahoe 2 GHI EMX I'm looking at a general purpose board for plugging in different types of sensors (at once)...
2
votes
5answers
2k views

Help fix or ignore aliasing warning in gcc

I'm having a problem working with the TI/Stellaris EK-LM3S6965 demo board and associated software, specifically the OLED display driver. My problem is not that it doesn't work, it's that it mostly ...
1
vote
2answers
423 views

Problems with peripheral control of a LED on an AT91SAM7X chip

I'm using an AT91SAM7 chip on the MakingThings board for some custom work. To better understand the peripheral driver, I'm trying to directly call/control an output pin (PA12) to turn on the status ...
6
votes
2answers
1k views

Relation between power consumed and MCPS (million cycles per second) consumed on a processor

I have been working on a ARM cortex A8 board on MP3 decoder. While doing this I have a requirement saying the MP3 decoder solution I am doing should consume 50 mW. This generated few questions in my ...