embedded

I'm developing software for an ARM Cortex M3 (NXP LPC1769) microncontroller. At the moment I'm searching for a mechansim to detect if my function is called within an ISR. I asume that I have to check a register. Based on this information I would like to call difficult functions. I already checked the reference manual, if there is a register containing the necessary information. For example I tried to detect if I'm called from an ISR (I used SysTick-ISR) based on the "Interrupt Active Bit Register" (IABR) register. This register should be != 0 if an ISR is active. But the value was 0x00000000.

I'm working on a developing board that has a 32-bit ARM based microntroller on it (namely the board is Atmel SAM D21J18A). I'm still at the learning phase and I have a lot to go, but I'm really into embedded systems. I have some background in C. However, it's obviously not enough. I was looking at the codes of an example project by Atmel, and I didn't really get some parts of it. Here is one of them: #define PORT ((Port *)0x41004400UL) /**< \brief (PORT) APB Base Address */ Port is defined as: typedef struct { PortGroup Group[2]; /**< \brief Offset: 0x00 PortGroup groups [GROUPS] */ } Port;

From what I've read, the solution to my problem is to use an interrupt, but if I understand them correctly, I can't use a delay in the routine that gets called by the interrupt. I've got a large pushbutton LED switch. I want it to have a heartbeat while sitting idle, but once it's pushed, stay green and execute code. I can break the heartbeat() if I push the button enough times (I assume getting the state change at just the right time as it finishes a loop of the heartbeat ), but I'm stuck on how to make it work on the first click. Is there an alternative way to do what I'm attempting? void

I am very new to Microcontroller programming particularly PIC18F87J11 , and I am using MPLAB C18 compiler. I was reading the datasheet for various topics such as saving to memory or working with timers. I noticed the examples are written in assembly language, but I have minimum experience with it. Is there a way to use the power of Assembly and C together in my project? I do not understand assembly that good or else I would try to convert the code to C, in this case, I rather just use the assembly code with few changes. Now can someone show me an example of how you would use an assembly

Situtation I have a FEZ Cobra II NET running test code. It sends data every second to a server on the LAN. The server writes the data to a text file. After 27 hours and 97,200 successful sends, the Cobra stops sending. Clearly I am not going to debug for 27 hours, and I am not sure how else to trouble shoot, because standard software trouble shooting approaches do not apply. Question If I were to write to log errors on the Cobra, how would I access them? Does NETMF have application logs? How can we access them? Is there an event viewer? What other trouble shooting / debugging steps are viable

I have the following setup: An Android device uses a 'Client' socket to connect to a remote embedded device, The Android application uses the following code snippet to connect to the embedded device. On the embedded device uses MindTree BT stack, where server serial socket is prepared according to some properties in the device, which the Android application is familiar with, the connection defined on the embedded device, is not secured!! The combination of both applications works on: 2 LG phones different models (version code < 10 uses the "Normal method" ) 2 HTC's different models (version