Questions tagged [assembly]
This is a programming language that is at a low level that corresponds with the instruction set of the machine being programmed.
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8051 to I2C backpack/4 bit LCD Byte Construct Probelms
Been feverishly writing bit bang code in assembly for this I2C backpack/4 bit LCD and dont quite understand the binary constructs I need to display text. Im trying to learn this the real way, not the ...
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Programming a PIC16F84A Microcontoller in assembly with MPLAB increment problem
I'm programming a PIC16F84A microcontroller to automatically increment a number with a 1 second delay, and get it displayed on a 7 Segment Display. The 7 segment display is already set so there's no ...
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45 views
How x86-64 Intel CPU understands how many bytes load into a register
I have the following byte code one the left and and its byte representation on the right:
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Control systems composed of several different parts just as program blocks
We're having a course on System Software this semester and we're covering the chapter on Assemblers presently. Our professor gave us some questions to think about. One of them is this:
Control ...
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2answers
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AVR gcrt1.S behavior
So basically i have decompiled unoptimized simple program and saw that it runs through gcrt1.S, and i dived in to assembly language and tried to understand what exactly it does. here is my code and my ...
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79 views
PIC programming in Assembly
I went through an assembly program of the PIC16F88 downloaded from microchip and saw something that I have ever seen before
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How to “translate” to C the assembly command mov [closed]
I'm not sure how to understand the assembly command mov. e.g. in the following section:
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1answer
53 views
What commands in assembly cast value from hexa to decimal when they are called?
how can I know if a command is treating an immediate as a decimal or as a hexadecimal? For e.g div casts the values into decimal before it makes the arithmetic division:
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How does a number is saved in a register
I've tried looking online, but I still haven't quite figured it out - does a number, for example 0x100 saved in a register by some convention like little/big endian like thigs are saved in memory or ...
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8085; Why RET doesn't require a 6 T-states Fetch cycle?
The CALL instruction, requires 5 machine cycles, namely, OPCODE-FETCH, MEMORY READ, MEMORY READ, MEMORY WRITE, MEMORY WRITE. The ...
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8086 doesn't write to external memory [duplicate]
we are working on a circuit containing a 8086 and 8x(2KB) external memories (6116). the problem is that all control signals are asserted correctly, the address and data is provided but they are not ...
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236 views
Connect 8086 cpu to memory chips and io devices in proteus
I have a project based on simulating operation of 8086 processor with memory and I/O devices using Proteus simulator.
Memory is eight 2K 6116 chips and I/O contains 2 seven-segment displays and a ...
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369 views
How do I perform division of two numbers in PIC16F877A in assembly language?
I'm currently using MPLab x IDE for PIC16F877A I want to divide two numbers and find out the quotient ( Let the two numbers be 10 and 4) and store in some register.
I was thinking of a loop which ...
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176 views
What does _SFR_IO8(0x04) do? AVR
I'm trying to write a program in assembly to toggle the on-board LED of the Arduino MEGA2560.
To do so I just have to indicate the direction of the pin (13 in this case which is PB7) as output and ...
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1answer
123 views
PIC Microcontroller ADC not functioning
I coded an assembly script to take the input values from two LDRs in parallel. Then my microcontroller was supposed to convert this analogue input into an 8-bit digital value (omitting the 2 LSBs). ...
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139 views
Back branches in code
While reading this file on software hazards this slide says:
"No Back Branch in the Code"
I wonder what does it mean? Normally when we write code in C-language then we don't actually do branching ...
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2answers
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Load, then add in assembly
Im trying to load 2 values in assembly under the tm4c1294ntpcd (Cortex M4) then add it with the next code
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Startup code in pure Assembly program [closed]
I came across some articles and books that saying when, I write in high-level language like C, startup code is used to prepare for my main code but when I write my program in pure Assembly there is no ...
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102 views
Using pointer of a function's returned value
I would like to know if there are possibilities to change the following code:
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1answer
430 views
beq assembly MIPS
I'm so confused about beq function in assembly MIPS.
Lets assume I have beq $t1 $t2 60 , so it would be mapped as I type function. so we could say for example ...
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2answers
75 views
Problem in Clock Gating Control with ARM Tiva C
When I access a peripheral register (such as a GPIO port) just after enabling the clock gating of the peripheral, a hard fault happens. For example:
This code doesn't work (generates a hard fault):
<...
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2answers
72 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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3answers
330 views
How to look at the emitted assembly code of MPLAB X IDE
I'm using MPLAB X IDE V5.05 to generate the code to program a PIC32MX470F512L.
It happens that i'm having some problems in the code and i would want to take a look ...
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1answer
80 views
Assembly language, accessing bytes of memory
I have some memory address 0x00000100 that I want to read from. The lower 4 bits read from this address indicates the states of 4 buttons - So bit 0 shows the state of button 0, bit 1 shows the state ...
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205 views
Logisim input and terminal issue
I had this final gate that I made. but when I run it in terminal. it says my output is E instead of 0/1. I wanna know why my output is E instead of 0/1.
The circuit should have four inputs: A, B, C, ...
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1answer
39 views
Is Pull-up present by default?
I'm using the MC9S12DP512, Motorola's microcontroller. I was executing a service and ,at the end, I put low logic level at the pins PS4, PS5 and PS6, then after that, I configured these pins as inputs....
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As a computer science engineering graduate, do I need to learn Assembly language in today's day and age? [closed]
Given that there are simple and easy to learn/use MCU devices such as those offered by Arduino, Particle, TI (MSP430 series), Microchip (PIC16 series) does it make sense to teach ALP to computer ...
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121 views
Assembler program showing ACK even with the wrong slave address, I2C code problem!
I have this project communicating MPR121 capacitive touch sensing keyboard with 8051 microcontroller, with some references I've implemented some I2C code for serial communication between master and ...
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1answer
48 views
How to check the flow of assembler instructions execution?
I'm creating a project that uses I2C serial communication in assembler and I'm having some issues transmitting data and receiving back so I thought I should somehow debug the whole program, besides ...
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2answers
266 views
How to check whether a byte of 8 bits contains 1, assembler 8051?
I need to know how to check whether a byte contains a 1 for touch status in a MPR121 project, so if:
00000010 then pin 2 is touched
00000100 then pin 3 is touched
How can I detect it?
A ...
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1answer
67 views
[Updated]How to select the values to move in assembler?
I'm trying to make the led blinks on the tm4c1294ncpdt, so the basic idea its to make 2 routines , one to select the GPIO port (in this case the F) and other to keep up on and off.
the setup routine ...
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4answers
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What stops an assembly program from crashing the operating system? [closed]
First of all, I am a beginner, so if this question sounds silly, please point out the incorrect assumptions.
From what I understand, the job of an operating system is to manage hardware and the ...
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Branch offset out of range ARM assembly
So I tried compiling this code below but keep getting the 1176E error message of
Branch offset out of range 0xFFFFFFE8 out of range permitted values are up to 0x00007E
on the 5th code line. I ...
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264 views
TMOD value for timer 1 in mode 0 in 8051 microcontroller
What will be result of this statement:
MOV TMOD,#00H
Will it set it to timer 0 in mode 0 or to timer 1 in mode 0?
Other statements like:
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1answer
159 views
What is the XTAL clock used for in an 8051 microntroller?
I'm trying to design an 8051 microcontroller circuit which uses timers/counters, and the circuit I'm using for inspiration uses a clock generated using the XTAL1 and XTAL2 pins of the IC, shown in the ...
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1answer
57 views
Built-in Timer Module HCS12
Why is it preferable to use the built-in timer module rather than using assembly language coding to create delay loops?
I've gone through the entire "HCS12 Microcontroller and Embedded Systems" book,...
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56 views
Can you speed up debugging in Renesas High Performance Embedded Workshop by not flashing after breakpoint
I am debugging an H8S MCU in Renesas High Performance Embedded Workshop 4 with the attached E10A emulator, and find it's very slow when stepping through code because it keeps reflashing the chip ...
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2answers
356 views
Cortex M7 goes to HardFault immediately after reset
I am using the ATSAME70Q21 processor with a Cortex-M7 CPU.
My development environment is Atmel Studio 7. I am using the SAME70 XPlained demo board.
I am creating some code in assembly language.
As ...
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1answer
141 views
.dw directive in AVR assembler
the piece of code below is mentioned in 8-bit AVR's instruction set as an example to explain the LPM instruction.
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1answer
678 views
What does [WEAK] mean in STM32 startup assembly code?
I was reading the STM32F407 startup file in Keil software to gather some information. I faced this problem: What is the [WEAK] symbol used for?
A part of the code ...
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1answer
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How to produce a middle C on intel 8080?
This is a example problem in my book. Assuming pin 5 of port 4 is connected to an amplifier that drives a loudspeaker, the solution is given as,
The frequency of middle C is $$f=261.63\ \text{Hz}$$
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How do we find the bandwidth of a bus?
The data width and cycle rate are used to determine the bandwidth, or the total amount of data that the bus can transmit. An 8-bit bus (1-byte data width) that operates at a cycle rate of 1,000 MHz (1,...
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2answers
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DIP (dual inline package) [closed]
searching on the net, but couldnt understand for what is used DIP? Is it RAM? Will be glad for your answers.
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1answer
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store word assembly instruction in risc-v
I'm really confused about the store instruction in risc-v. When I store word from register to memory, after the word is copied into the mem, does it sign-extended or zero-extended or perhaps something ...
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2answers
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How to load immediate negative value in a register?
For example on 8-bit AVR given a register r16 I do something like ldi r16, 44 and this way I can give it positive values from 0 ...
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2answers
601 views
Understanding ARM instruction for numerical literal
I have done an instruction trace while trying to find a bug on a Cortex M3. There is one part of the command I cannot understand.
STRB R1, [R3], #+0x01
According ...
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1answer
138 views
ATTiny414 inline assembly operand constraints for IO pin parameter
I'm trying to use the light_ws2812 library to drive WS2812 LEDs from an ATTiny414.
The core of that library is an inline assembly snippet that bitbangs the serial line. here it is with the timing-nops ...
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3answers
254 views
Why do we need to declare ports as input/output?
I am writing code in assembly language (AT89s51). When I see a standard program, the ports are typically defined as inputs or outputs. But, without defining them it seems to work fine. How is this ...
