embedded

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 8 years ago . I'm very much interested in building applications for Embedded Devices. I'm in my 3rd year Electrical Engineering and I'm passionate

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 8 years ago . I'm going to start working on a project where I need to have a decent understanding of Assembly language for the PIC microcontroller's

问题 This query is regarding allocation of memory using malloc . Generally what we say is malloc allocates memory from heap. Now say I have a plain embedded system(No operating system), I have normal program loaded where I do malloc in my program. In this case where is the memory allocated from ? 回答1: malloc() is a function that is usually implemented by the runtime-library. You are right, if you are running on top of an operating system, then malloc will sometimes (but not every time) trigger a

问题 I am sampling a sine wave at 48 kHz, the frequency range of my sine wave can vary from 0 to 20000 Hz with a step of about 100 Hz. I am using a lookup table approach. So I generate 4096 samples for a sine wave for 4096 different phases. I think the general idea behind this to increment the step size and use different step sizes for different frequncy. So I do the following (pseudo code). But I am not sure how the step size is going to be related to the frequency I want to generate the samples

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 2 years ago . We are starting a new project based on an 8051 microcontroller. Questions: What is the best C compiler to use? Are there any open source 8051 compilers and how good are they? 回答1: Keil is what I have used with this microcontroller in the past. They've got a pretty good set of

问题 I like a lot of what I've read about D. Unified Documentation (That would make my job a lot easier.) Testing capability built in to the language. Debug code support in the language. Forward Declarations. (I always thought it was stupid to declare the same function twice.) Built in features to replace the Preprocessor. Modules Typedef used for proper type checking instead of aliasing. Nested functions. ( Cough PASCAL Cough ) In and Out Parameters. (How obvious is that!) Supports low level

问题 I like a lot of what I've read about D. Unified Documentation (That would make my job a lot easier.) Testing capability built in to the language. Debug code support in the language. Forward Declarations. (I always thought it was stupid to declare the same function twice.) Built in features to replace the Preprocessor. Modules Typedef used for proper type checking instead of aliasing. Nested functions. ( Cough PASCAL Cough ) In and Out Parameters. (How obvious is that!) Supports low level

问题 I have an system running embedded linux and it is critical that it runs continuously. Basically it is a process for communicating to sensors and relaying that data to database and web client. If a crash occurs, how do I restart the application automatically? Also, there are several threads doing polling(eg sockets & uart communications). How do I ensure none of the threads get hung up or exit unexpectedly? Is there an easy to use watchdog that is threading friendly? 回答1: The gist of it is:

问题 By "human-readable serialisation format" I mean YAML , JSON , INI or like. Please note, XML is too verbose and too inconvenient for my purposes, so let's leave it alone as the last resort. The format should store the data as "named key -- value" pairs and allow for nesting and arrays. Absence of arrays is not critical, though. Also, type-awareness (ability to return data not only as plain strings) is highly appreciated. What I need exactly is a pure C library, which provides an API for

问题 By "human-readable serialisation format" I mean YAML , JSON , INI or like. Please note, XML is too verbose and too inconvenient for my purposes, so let's leave it alone as the last resort. The format should store the data as "named key -- value" pairs and allow for nesting and arrays. Absence of arrays is not critical, though. Also, type-awareness (ability to return data not only as plain strings) is highly appreciated. What I need exactly is a pure C library, which provides an API for