embedded

问题 I cross-compiled a Helloworld executable for ARM . It worked well on my friend's development board, but failed with a " segmentation fault " on my board. The two boards are slightly different in both hardware and software. My question is, how can I debug in my board? Is it relatively easy to debug such a simple program? Does it indicate that there's nothing wrong with the executable and the problem most probably lies in the filesystem of my board? Below is the code: #include <QApplication>

问题 I am using MPLAB C18 compiler with PIC18F87J11 and I am trying to save some values to flash memory, using inline assembly, which is a combination of C and assembly code. It looks like I can write and read to flash memory correctly, but as soon as I power cycle my PIC and then attempt to read what I previous saved from a specific address, I don't get the same value. I am saving 0x09 to 0xB22A address. Like I said, if I save the value then read it immediately, everything comes up correctly, but

问题 I've got DSP tms320vc5509a and NOR flash AT26DF321 on the board and I'm going to store named data on the flash. I don't need directory hierarchy, wear leveling (I hope system will write to flash very few times), but CRC is strongly needed. Thank you 回答1: You could look at the ELM-Petit FAT File System Module for an good small file system implementation. Not sure that it has CRC but you can add that to your low-level hardware drivers. 回答2: On a NOR flash, especially one that also contains my

问题 I'm trying to compile the crypto++ library to run for the armhf architecture. I'm following the method provided in this answer. I tweaked the setenv-embed.sh to match my system's configuration. The output of running . ./setenv-embed.sh is CPP: /usr/bin/arm-linux-gnueabihf-cpp CXX: /usr/bin/arm-linux-gnueabihf-g++ AR: /usr/bin/arm-linux-gnueabihf-ar LD: /usr/bin/arm-linux-gnueabihf-ld RANLIB: /usr/bin/arm-linux-gnueabihf-gcc-ranlib-4.8 ARM_EMBEDDED_TOOLCHAIN: /usr/bin ARM_EMBEDDED_CXX_HEADERS:

问题 I have a UIViewController with an UIScrollView in it. Then I created a new UIView subclass with some properties that I want to programmatically add in this UIScrollView until my data ends. Something that should look like this picture: I have read other topics that does that by creating a view and setting its class to the custom view subclass, but I want to do it programmatically and its not working. how would I do that? 回答1: From your image it looks like you're looking to load views from a

问题 I don't understand how tslib works. Let's say I have a serial touchscreen, in my understanding the data flows in the following way: ts press -> serial port -> ts driver -> tslib -> device file (like /dev/input/eventX) Is it right? Or do I need to insert some code between ts driver and tslib so that they can communicate? 回答1: Tslib does not operate between the touch screen driver and the input device file - it accesses the device file on behalf of the application using it. The key data flow

问题 I'm currently working on a project on STM32F4 and I'm using Eclipse. I've got some problems with the program - it seems to have a random behavior - sometimes it works fine, other times it has some errors. Sometimes when I try do debug with breakpoints I get the beautiful HardFault Handler and it really messes with my brains. Sorry for the little off-topic paragraph, just wanted to let you know why I decided to use printing to a log file at some key moments in the program so I can see in which

问题 In the ArduinoUnit unit testing library I have provided a mechanism for giving a TestSuite a name. A user of the library can write the following: TestSuite suite("my test suite"); // ... suite.run(); // Suite name is used here This is the expected usage - the name of the TestSuite is a string literal. However to prevent hard-to-find bugs I feel obliged to cater for different usages, for example: char* name = (char*) malloc(14); strcpy(name, "my test suite"); TestSuite suite(name); free(name);

问题 This question already has answers here : what is v and x means in freeRTOS task creating or used in it? (2 answers) Closed 3 years ago . I'm a complete newbie in RTOS and C programming, and I'm still getting used to the C good practices yet. So I opened a project which uses FreeRTOS, and I notice that the OS files use the Hungarian Notation. I know the notation a little, but faced some new "standards" in the FreeRTOS.h file, which are: #ifndef configASSERT #define configASSERT( x ) #define

问题 I am using Keil uVision and I keep getting this error: C:\Keil_v5\ARM\ARMCC\bin\..\include\rw/_defs.h(781): error: #20: identifier "namespace" is undefined What could lead to this error? Isn´t namespace automatically defined? 回答1: It looks like you are using C compilation for C++ code - check the compiler options. In C++ namespace is a reserved word, but not in C, so the compiler will try to interpret it as an identifier rather than a keyword - which will then of course make no sense