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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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Apple Mach-O Linker Errors (20) - Undefined symbols for architecture armv7

I received these errors after I added " -all_load " in the "Other Linker Flags" build setting once I added "libPusher-combined.a" and its header files. I followed the instructions exactly up to the part of typing in "-all_load" (under "Using a…
chrisjr
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Not allowing to use Constant defined in Objective C header file in swift class. Undefined symbols for architecture armv7

I created Objective C Header file. and added some properties in it. i declared static NSString* const kColor005C98 = @"005C98"; in Constants.h file I defined this file in Bridging-Header file as #import "Constants.h" Now when i want to use this…
waseemwk
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Keil vs GCC for ARM7?

How does Keil compare to GCC for ARM7 development? I'm in the process of choosing hw consultants for a medium size project and some use keil and some use gcc. I'd like to know the gotchas involved in going with either option...
c0m4
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Could not determine GDB version after sending: arm-none-eabi-gdb --version, response:

I'm trying to debug a project on Kinetis Design Studio with GDB PEMicro Interface Debugging but I get this error: 'Launching myProject' has encountered a problem. Could not determine GDB version after sending: arm-none-eabi-gdb --version,…
Jeff Pal
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What is non-aligned access? (ARM/Keil)

I'm using Keil to write Assembly for ARM 7. I have the following runtime error: Non-aligned Access: ARM Instruction at 000000F8H, Memory Access at 7F7F7F7FH Data Abort: ARM Instruction at 000000F8H, Memory Access at 7F7F7F7FH This doesn't really…
OJFord
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error: #29: expected an expression in C

my code contains #define READ_TAMPER_PIN() {((FIO2PIN & PIN_TAMPER) >> 12) ;} where PIN_TAMPER is again a macro- #define PIN_TAMPER 0x00001000; in one of the header file, and it is called in main() like x = READ_TAMPER_PIN(); it gives an…
YMJ
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Efficient floating point comparison (Cortex-A8)

There is a big (~100 000) array of floating point variables, and there is a threshold (also floating point). The problem is that I have to compare each one variable from the array with a threshold, but NEON flags transfer takes a really long time…
Alex
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"Expected a statement" error in embedded C

I'm getting error like "expected an statement" my code is as follows #define IN_Tamper 0X00001000 /*P2.12 = EINT2*/ #define DIR_IN_Tamper { FIO2DIR &= ~0X00001000 ; } /* main */ DIR_IN_Tamper(); if(((IN_Tamper >> 12) & 0x01) == 1) …
YMJ
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arm7tdmi IRQ and FIQ priority

Hello I am currently working with a AT91SAM7X256 running on "bare metal". I have thoroughly read the datasheet as well as the architecture manual, with that in mind I came away with the conclusion that FIQ is higher priority than IRQs therefore FIQs…
maguirre
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Floating point status transfer on ARM7 Cortex A8

There is a comparison: if( val0 > val1 ) where val0 and val1 are double variables. The code generated by the Apple LLVM compiler is +0x184 vcmpe.f64 d17, d16 +0x188 vmrs APSR_nzcv, fpscr <-- FP…
Alex
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How to right rotate a 64-bit value efficiently in ARM7 assembler?

The ARM7-command set offers efficient ways to right rotate 32-bit values by an arbitrary amount in assembler. For the 2nd operand of an operation it is even "for free" by specifying ror #n as shifter operand, but for 64-bit integers no direct…
Whoever
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Why does ARM have 64KB Large Pages?

The ARM720T user manual mentions small and large pages. Since the ARM 720T requires a 64KB page table entry to be duplicated 16 times in the page table, why not place 16 small page (4KB) entries to mimic a 64KB page entry instead of using a large…
Revanth Kamaraj
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Error: ld: warning: ignoring file libfile01.a, file was built for archive which is not the architecture being linked (armv7): libfile01.a

I'm trying to compile a project developed in C language for iOS devices. It uses custom library file, libcurl, libcrypto, libssl and libpthread. I have successfully compiled it for Mac OS X, but having issues compiling it for iOS. Also, any help I…
satinder
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facebook ios sdk build fails on device, works on simulator

I am trying to build an app (with ARC) that uses the facebook_ios_sdk (the latest version on github). As recommended by Facebook, I used the build script to create a static library and then added it to the project. Now when I build the project for…
Devang
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Trying to understand an assembly line of ARM7

I have this assembly line : 01000AD8: 979FF103 LDRLS PC,[PC,R3,LSL #2] With PC = 0x01000AD8 R3 = 0x00000008 CDPS = 800000D3 (so C=0, Z=0) When I execute this line, the new value for PC should be(if I understand LDRLS correctly*) PC =…
Martin Allard
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