Questions tagged [assembler]
An assembler is a program that translates programs from assembly language to machine language. An assembler creates object code by translating assembly instruction mnemonics into op-codes, and by resolving symbolic names for memory locations and other entities.
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PIC - How to program them in assembly?
For years I programmed PIC controllers in assembler, but let it drop. Now I want to get back to where I was, and - so help me - I can't find out where to start.
Downloaded MPLAB-X-IDE and it says I ...
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2answers
105 views
ATmega2560 I2C (TWI) assembler configuration problems
I am using ATmega2560 for testing an I2C code. I wrote subrutines in assembler
for init, start, write, read and stop the I2C setup. The goal is that master writes 11110000 to a slave with address ...
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1answer
184 views
Error (10536): VHDL Loop Statement error at InstructionMemory.vhd(31): loop must terminate within 10,000 iterations
Can someone help me solve this problem?
Its my code below:
...
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2answers
204 views
How to correctly use a address in assembler?
Im trying to use several registers on the M4/tm4c1294 in a way to avoid write every time the same register number.
The question is how to make the number of the register and if the reference is ...
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1answer
217 views
How to create unique label on macro definition on AVR GNU assembler?
On AVR GNU assembler I'm trying to create a label inside a macro definition.
I would like to create a macro, which has a private lable, or unique label inside - just to be able to jump inside macro ...
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0answers
172 views
PIC assembly: express integer constant as string at build time
One of my engineers came to me with a question that I can't answer. This is for a project using a PIC16F controller, all written in assembler.
He is defining a constant that he wants his program to ...
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1answer
330 views
AVR-GCC initialization code
Consider the following asm.S
.global main
main:
rjmp main
Compile and dump it with these commands:
...
-6
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1answer
172 views
8085 Programming Basics
Bcz of CALL, SP will be decremented by 2. Then bcz of POP, SP will get incremented by 2. So, SP will be 27FFH. But, I am confused with HL register part. Please help me with the above problem.
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1answer
719 views
Assembler basic question : translation to machine code
How does a assembler (at very basic level) work in translation of Assembly language to machine code ?
[What my understanding is that when a Programme is written it is written in text and then ...
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1answer
5k views
8051 Move Data To/From External Memor
As I was using this instruction movx a,@dptr . and I didnt udnerstand how a 16 bits number is being copied to the accumulator when the accumulator can only hold 8 bits ?
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1answer
490 views
Assembler language basics parity flag
I am a beginner in assembler language I was reading some stuff online(belongs to a university) and I saw that
the P bit in psw after executing this instruction mov a,#03h A=0000 0011B so P=0
first ...
3
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1answer
162 views
What does the flag formula symbols mean in AVR assembler documentations
I was reading about something in the assembler documentations of the AVR microcontroller and I usually come across a line used to describe how would an instruction affect specific flag in the status ...
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3answers
567 views
If I am writing a processor in VHDL, how can I get an assembler to ease testing?
Provided that I have written a simple microprocessor design in VHDL where I have decided what instructions it has to do each task, I will then have to write test code in machine language which is ...
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2answers
618 views
Assembler i8080 proccessor. Dividing two 16bits numbers
I would like to ask you about division algorithm which I can implement in Assembler for i8080 processor. I know the easiest method is dividing by repeated subtraction but it is very slow. I found many ...
3
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1answer
1k views
Atmel Studio assembler: how do I define a port pin?
Let's say I need to test a port pin like this:
sbic PIND,2
This should work, but in C I would definitely made a ...
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2answers
586 views
How do I get a value of a RAM by given address? [closed]
I think I know how RAM works, but I have an exercise where I have to read at the address 0x????.
Furthermore, I am only interested what value get returned after the reading command. For example:
...
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2answers
244 views
Why in some instruction the order of register is different between machine code and assemble code for MIPS?
For example in assemble code we have /add rd rs rt/ but in machine code we have /opcode rs rt rd/, where the destination register is at last position. Why MIPS arrange their code like this ?
I know in ...
2
votes
1answer
100 views
STM32L100 SysStick not divided by 8?
This is probably some stupid mistake, but I can't understand what's going on.
I have a Discovery board with STM32L100RC.
The HSI oscillator runs at 16 MHz and is selected as the system clock source, ...
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votes
1answer
77 views
Timer0 loop not working on PIC12F508
I'm quite new in programming PICS, but have already done some projects. All of them were working fine. But now I'm stuck with a very simple one and I don't find out what's wrong. I'm pretty sure that'...
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2answers
661 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:
...
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3answers
2k views
NOP instruction after branch on ARMv7 Cortex M3
I'm interested, why for Cortex M3 microcontroller (stm32f103) compiler sometimes generates a NOP instruction after branch. And why it sometimes doesn't.
For example:
...
2
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2answers
956 views
How can I bind a local variable to AVR's rXX register?
I need to have programmable pause with precision as high as possible. To accomplish this I have the following GCC code:
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3answers
2k 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
240 views
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3answers
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PIC16F88 - compare ADC results with a constant value
I am trying to write my first program in assembler for PIC16F886. The program is supposed to do the following:
Read ADC value on channel AN0
If the value is smaller than 128 - turn LED off
Otherwise -...
3
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0answers
510 views
dsPIC: Link assembler project with XC16 in command line mode
I have an assembler project that compiles and links fine with MPLABX. Now I am trying to build it from the command line. Attempt to use the command line from MPLABX fails.
When I am calling:
C:\...
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2answers
882 views
How to find macro “usage position” in microchip MPLab
I'm having troubles when MPLab shows me error within a macros (with assembly language). It gives the line number of where macros is defined. That's not very helpful if the macros is working fine, but ...
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1answer
776 views
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4answers
3k views
Documentation on `avr-as`
I'm starting learn AVR microcontrollers. But my OS is Linux. I have installed avr-binutils with avr-as. But I can't find ...
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1answer
2k views
How is a two-pass assembler designed? [closed]
What is the algorithm for the first pass and the second pass of an assembler?
I have been looking for a description or tutorial but haven't found one. If there are tutorials that explain these ...
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2answers
1k views
in dsPIC33 assembler, can I use all of the w registers?
Most of my dsPIC3 application is written in C, but one function is particularly speed sensitive, so I had to write that function in assembler. The function looks roughly like this:
...
