embedded

Background My board incorporates an STM32 microcontroller with an SD/MMC card on SPI and samples analogue data at 48 ksamples/s. I am using the Keil Real-time Library RTX kernel, and ELM FatFs . I have a high priority task that captures analogue data via DMA in blocks of 40 samples (40 x 16 bit); the data is passed via a queue of length 128 (which constitutes about 107 ms of sample buffering) to a second low priority task that collates sample blocks into a 2560 byte buffer (this being a multiple of both the 512 byte SD sector size and the 40 sample block size). when this buffer is full (32

How should I manage memory in my mission critical embedded application? I found some articles with google, but couldn't pinpoint a really useful practical guide. The DO-178b forbids dynamic memory allocations, but how will you manage the memory then? Preallocate everything in advance and send a pointer to each function that needs allocation? Allocate it on the stack? Use a global static allocator (but then it's very similar to dynamic allocation)? Answers can be of the form of regular answer, reference to a resource, or reference to good opensource embedded system for example. clarification:

I see that lwIP has some AutoIP (aka IPv4LL, aka RFC 3927 ) code, but I can't tell if it does anything higher up in the Zeroconf stack, namely mDNS and DNS-SD (with RFC 2782 ). So, does lwIP support DNS-SD service discovery? If not, would it be easy to port code from a project like Avahi that does (assuming licensing allows it)? No, lwIP does not support any part of Zeroconf except AutoIP. I've not looked at Avahi but porting Apples mDNSResponder to lwIP is quite straightforward. There is one bit of nastiness where you have to pull back the pbuf headers to access the IP header to get the

I'm working on an embedded Linux project that interfaces an ARM9 to a hardware video encoder chip, and writes the video out to SD card or USB stick. The software architecture involves a kernel driver that reads data into a pool of buffers, and a userland app that writes the data to a file on the mounted removable device. I am finding that above a certain data rate (around 750kbyte/sec) I start to see the userland video-writing app stalling for maybe half a second, about every 5 seconds. This is enough to cause the kernel driver to run out of buffers - and even if I could increase the number of

I`m looking for alternatives programming languages (from assembly, C, C++ and basic) to embedded (microcontroller) programming. Is it possible for example, to program microcontrollers in C# or Java? Maybe Ruby or Python? If possible, please post development tools and hardware used. There's also Lua. See eLua . Ira Baxter FORTH has been popular in embedded systems for a long time. I have no specific experience with it but it is very cleverly designed to provide a lot of functionality in a small amount of space even on difficult micro controllers, using threaded code interpretation methods. It

When you're doing a usual gdb session on an executable file on the same computer, you can give the run command and it will start the program over again. When you're running gdb on an embedded system, as with the command target localhost:3210', how do you start the program over again without quitting and restarting your gdb session? You are looking for Multi-Process Mode for gdbserver and set remote exec-file filename Unfortunately, I don't know of a way to restart the application and still maintain your session. A workaround is to set the PC back to the entry point of your program. You can do