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Questions tagged [arm7]

ARM7 is an older generation of ARM processor designs.

This generation introduced the Thumb 16-bit instruction set providing improved code density.

The ARM7 family is the world’s most widely used 32-bit embedded processor family, with more than 170 silicon licensees and over 10 Billion units shipped since its introduction in 1994.

More information at Wikipedia page of ARM7

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Porting a project that is written for STM32 (ARM-Cortex M7 to NXP (ARM-Cortex M7)

The STM32 supply is very bad at the moment hence I am considering moving away from the STM32 and going for NXP since the supply is much better. I would like to ask for advice regarding migrating from STM32 to NXP: Have anyone tried to migrate their…
TheBestPlayer
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ARCHS, missing archive intermediate build files and failure to deploy onto real device

My project runs and compiles fine on simulator - but stubbornly won't on my real device. The errors are below. Indeed the archive intermediate file 'FoodFeed' is missing from the derived data folder - but I don't think I can simply 'put it back' -…
Mike Albertson
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How load a 64 bit number in a 32 bit arm processor?

I am trying to load a 64-bit number on a 32-bit ARM7TDMI-S microprocessor however, I am not understanding how to do so. I know that MOV and LDR all store only 32bit numbers so is there any way I can use 2 32bit registers as one 64-bit register?
Kruti Deepan Panda
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Decoding ARM7 machine language to ARM instruction

Trying to decode: 0x15882BCD 0xC3A01B28 I keep on getting the LDMDAHS instruction, but I know that isn't right. Could someone help?
R B
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UART overrun error when attempting to write to transmit holding register (U0THR)

So, I have a terminal connected to TxD0 and RxD0 pins. Let's say that I just want to test whether writing to it works after all. I wrote few functions to make UART be able to read and write chars and strings. Although if I try to run it in the…
DemoVision
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How do I perform modulus on ARM7?

I am having a lot of trouble doing modulus on ARM7. Currently, I have this code: ADD R0,R0,R1 MOV R0, R0 MOD 2 BX LR But it doesn't work at all. It seems from what my classmates have done that we are supposed to do it by bit shifts, but I don't…
thedogs
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ARM 7 nested interrupts confusion

I've been reading about the classical ARM 7 microcontroller. There are two types of interrupts: IRQ and FIQ. FIQ allowing faster interrupt handling and having a higher priority than IRQ. It states that modern ARM versions have nested…
Engineer999
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Xcode 8 Swift 3 Undefined symbols for architecture armv7

As I'm not allowed to add an answer to several duplicated questions, I will ask this question and give also one answer ;-) The undefined symbol was a call to a self written swift function. This function sits in an swift file with only "global"…
Hardy_Germany
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LSB of ARM7TDMI link register on external interrupt (IRQ) call from Thumb mode

Assuming that the ARM7TDMI is in Thumb mode when an interrupt occurs, is the LSB of r14_irq = 1 once the ISR is entered?
Revanth Kamaraj
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Adding extenal library to compiler toolchain for ARM

I have downloaded compiler tool chain for ARM Target. My host machine: Linux Target H/w : ARM7 But i need to add some additional library with that tool chain. I need to know how to add new library to existing tool chain? Thanks Hari
hariprasath
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Machine code to ARM7 Assembly

I'm trying to get the following machine code instruction written in ARMv7 Assembly 1010 1110 00001011 0000 0000 0000 0100 I wrote it out in hex as below 0xAE0B0004 After messing about with several different instructions with ARMSim, I finally got…
v3nd3774
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If interrupted between instructions a, b do some stuff

I am trying to write assembly to detect if the present interrupt happened between two particular instructions. I think I have it, but it's not easy for me to test, so if someone could verify I would very much appreciate it. LDR R0, =INSTR_A ;address…
OJFord
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AT91SAM7x: DisASM chaos probably caused by linker

I use Eclipse and Yagarto toolchain (non-eabi, GCC 4.7.1) to program a ARM 7 chip (Atmel's AT91SAM7X256), Goal of this project is to place a bootloader in a defined range of ROM, which is copied to RAM later (see image below, ROM address 0x104000…
Paule
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ARM assembly, comparing signed values

I have a very simple problem but it is driving me up the wall, would you please help me? Here is the question: how do I compare two signed byte values in ARM assembly? This is what I tried: ldrsb r1, [r0], #1 ldrsb r2, [r0] cmp r1, r2 r0 is loaded…
PaulK
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Getting started with this ARM7 board

This bad boy arrived in the post recently. But, didn't have any instructions, CD-ROM or Dev Kit stuff. Despite lack of instructions, I'm pretty sure we should be able to get it going with DS-5, a JTAG cable and embedded linux. The goal is to get a…
tobinharris
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