embedded

问题 Are there any good resources (books, websites) that give very good comparison of different scheduling algorithms for a Finite State Machine (FSM) in an embedded system without an OS? I am designing a simple embedded web server without an OS. I would like to know what are the various methods used to schedule the processing of the different events that occur in the system. For example,if two events arrived at the same time how are the events prioritized? If I assign different priorities to

问题 I have a computer with 1 MB of RAM and no other local storage. I must use it to accept 1 million 8-digit decimal numbers over a TCP connection, sort them, and then send the sorted list out over another TCP connection. The list of numbers may contain duplicates, which I must not discard. The code will be placed in ROM, so I need not subtract the size of my code from the 1 MB. I already have code to drive the Ethernet port and handle TCP/IP connections, and it requires 2 KB for its state data,

问题 I'm new to C and was kind of thrust into this world of embedded processing with C. I need to convert to char* and output integers and floating point numbers (only 0.01 resolution) to an LCD screen with an 8 bit interface. I've been reading through some of the posts and I see all these great ideas for converting int and float to char* but I'm not exactly sure what's going on in them. Can someone provide a method for my two queries and a little explanation? 回答1: It actually depends upon the

问题 hi i am working on arm controller lm3s8962 i m not able to understand the code below as per my understanding it is checking if the character is from the array or not, which he created using the ascii characters{i.e in the while loop : while(*pcStr != 0) }, i am not able to get what he is doing in the code after the line "Build and display the character buffer" plz can anyone explain this void RIT128x96x4StringDraw(const char *pcStr, unsigned long ulX, unsigned long ulY, unsigned char ucLevel)

问题 Here i want to know the how can i implement calculate CRC16 for Any type of file, Here i have idea about CRC16 and its code logic. here i made one function which take file path as a input and find out CRC value of this. here i pass file name in this function and this functions calculates CRC value of this file. but i want to calculate all types of files like .tar,.tar.gz,.txt,.bin,.scr etc . so here i open this all files and "rb" mode and take one by one character and find out CRC value its

问题 I am using arm-none-eabi-gcc toolchain, v 4.8.2, on LinuxMint 17.2 64b. I am, at hobbyist level, trying to play with a TM4C123G board and its usual features (coding various blinkies, uart things...) but always trying to remain as close to the metal as possible without using other libraries (eg CMSIS...) whenever possible. Also no IDE (CCS, Keil...), just Linux terminal windows, the board and I... All that mostly for education purpose. The issue : I am stuck trying to implement the usual

问题 I am trying to redirect all serial data to a process in VxWorks. Using the following code fd = open("/tyCo/0", O_RDWR,0); ioctl(fd, FIOSETOPTIONS, OPT_TERMINAL & ~OPT_7_BIT); read(fd, line, 100); gives the correct input, except the first character entered is not populated, but is printed to the terminal. So if I enter "Hello", "H" is printed out and line="ello". If I don't enter anything and hit the return key, I get a prompt from the VxWorks Shell. I think that the VxWorks Shell is

问题 I am doing project on the Embedded web server. The Embedded server is without the Operating system. At this conditions how the multiple task will be scheduled in such system? are the cyclic-executive and super-loop same things? 回答1: cyclic-executive with or without interrupts 来源： https://stackoverflow.com/questions/11904288/task-scheduling-in-embedded-web-server-with-out-os

问题 I'm trying to display a string on stm32f769i-disco's LED with BSP libraries from STM32CubeF7. However, nothing happens. Here is the code: #include "stm32f7xx_hal.h" #include "stm32f769i_discovery.h" #include "stm32f769i_discovery_lcd.h" #include "stm32f7xx.h" #include <stdio.h> char str[] = "Hello from BSP LCD demo!"; void LCDInit() { // Initialize the LCD using the BSP_LCD_Init() function. BSP_LCD_Init(); // Select the LCD layer to be used using the BSP_LCD_SelectLayer() function. //BSP_LCD

问题 I have a program design question in FreeRTOS: I have a state machine with 4 states, and 6 tasks. In each state, different tasks must be executed, excepting Task1, which is always active: State 1: Task1, Task2, Task3 State 2: Task1, Task2, Task3, Task4 State 3: Task1, Task5 State 4: Task1, Task6 Task1, Task3, Task4, Task5 and Task6 are periodic, and each one reads a different sensor. Task2 is aperiodic, it sends a GPRS alarm only if a threshold is reached. The switching between the states is