embedded

I've gathered some level of knowledge on several components (including software and hardware) which are involved in general DMA transactions in ARM based boards, but I don't understand how is it all perfectly integrated, I didn't find a full coherent description about this. I'll write down the high level of the knowledge I already have and I hope that someone could fix me where I'm wrong and complete the missing parts so the whole picture would be clear. My description starts with the userspace software and drills down to the hardware components. The misunderstood parts are in italic-bold

I'm about to remove "as many as possible" dynamic heap allocation in my application and I wonder how I can make sure I didn't miss anything. Currently I'm looking for a way to easily or even automatically tell, if any (or which) parts of the code might invoke the standard implementations of new / delete or malloc / free without having to dynamically trace allocations (i.e. via static code analysis or feedback from compiler/linker). It's easy to spot (or search for) code which directly calls new or malloc of course: int main() { auto s = new std::string(); delete s; } Just in case the

We use an embedded device to send packets from a serial port over a serial-to-Ethernet converter to a server. One manufacturer we use, Moxa, will always send the packets in the same manner which they are constructed. Meaning, if we construct a packet size of 255, it will always send the packet in a 255 length. The other manufacturer, Tibbo, if we send the packet size 255, it will break the packet up if it is greater than 128. This is the answer I received from the Tibbo engineers at the time: "From what I understand and what the engineers said, even if the other devices provide you with the

This is actually a design question for firmware in an embedded system I have two ISRs (of same priority) executed independently . These ISRs are triggered when the h/w generates data. I want a mechanism which must be put in place to synchronise between task1 and task2. task 2 must know about the certain values calculated in task1 which must then be taken into account while computing certain values in task2. I don't have OS primitives to use ie the system does not have any Operating system. Task1 is executed within the context of ISR1 and task2 within the context of ISR2. The processor which we