All Questions
36
questions
1
vote
2
answers
184
views
Why do AVR microprocessors have two ways (paths) to access I/O ports?
I've an ATmega328P.
Register Summary Page 275 ATmega328P datasheet.
The first address is the I/O address, and the second is the data memory address.
I'm going to set all (D ports) Data Direction ...
- 27
0
votes
1
answer
133
views
How does data reach peripherals in STM32H7xx?
I'm trying to understand bus interconnection matrix in stm32h7xx. Here is a capture of the H753's one:
In particular, I'm wondering how a data buffer located in DTCM would reach the SPI1's tx ...
- 1,259
2
votes
0
answers
188
views
Does NOR flash wear occur when rewriting a bit to its same value?
The obvious answer is no. Wear is caused by discharging a memory cell (bit). If the cell is a 1 and you write a 1, the cell does not get discharged. If the cell is zero and you write a zero, the cell ...
2
votes
2
answers
453
views
Keil uVision Disassembly Window with ARM Microcontroller
I have a couple of probably simple questions for you all regarding disassembly from C code to assembly code. I am using Keil uVision as a programmer and debugger with a TIVA TM4C123GXL microcontroller ...
- 1,555
2
votes
2
answers
2k
views
STM32 SD mounting returns error with SDIO
Overview
I'm using a STM32F407ZGT6 and I'm currently trying to mount SD cards (MicroSD 32GB HCI and 256GB XCI picture) to the board using the FATFS library bare-metal. To handle low level I/O, I'm ...
- 155
0
votes
2
answers
1k
views
How do embedded systems deal with virtual and physical memory addressing?
I'm referring to the Wikipedia page about virtual memory, the last paragraph in Usage section:
Embedded systems and other special-purpose computer systems that require very fast and/or very ...
- 455
0
votes
2
answers
342
views
Is not it too much memory consumption for a simple thing?
I was trying to lower the memory consumption in my project and realized that a simple change of "uint8_t" value to the "define" shows effect much more and I thought. It seems I'm ...
- 69
0
votes
1
answer
113
views
Built in Self Test - In Embedded memories
I am reading this thing called -BIST (Built in Self Test).
I understand that, before a module enters its intended functionality, this BIST is made to run within the module. Once, this BIST is passed, ...
user220456
1
vote
2
answers
807
views
How do I implement authentication on an embedded device? [closed]
I have been reading a lot about encryption lately but most sources just care about making sure that the connection between two parties is secure. I want to know how I can be sure that the party I am ...
- 193
0
votes
1
answer
45
views
Read-only for some masters but read-write for other?
Is it possible that a memory/memory region be read-only for some masters/chip components but read-write for others?
It is kind of vague question, but from a conceptual point view would this be ...
- 527
1
vote
1
answer
604
views
PCB sound memory for toys [closed]
I want to build a toy. The initial build will be a prototype but if the idea 'sells,' I want to build en-masse.
For the prototype, as I do not have (beyond what I learnt at Uni) industry experience, ...
- 111
-1
votes
3
answers
494
views
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 ...
0
votes
2
answers
457
views
Reading current memory image from a micro controller
I have the MPLAB XPress Evaluation Board, which has the PIC16F18855 microcontroller on it. The way to program it is just to copy a ...
- 105
2
votes
1
answer
327
views
How can I protect a microcontroller from memory corruption due to buffer overruns? [closed]
I have recently been working on what I believe is a buffer overrun problem in a microcontroller with software that I wrote. I'm using an Atmega328PB, so it has no such thing as a MMU or address space ...
- 1,249
0
votes
0
answers
483
views
STM32 with Winbond W25Q80DV Write Data Issue
I am trying to store data in SPI FLASH MEMORY of WINBOND W25Q80DV. I am able to read status registers and manufacturer ID successfully but can't able to write data into it. The procedure I followed:
...
- 173