dynamically allocating memory!!!!

[fta]

i was wondering how reliablly can memory be allocated dynamically. i am allocating about 62 bytes to a pointer to an array at the start of the program and then freeing up that memory space.

[Ttelmah]

First comment. If you are just allocating memory at the beginning, and clearing it at the end, using a fixed size, why bother?. The 'point' about dynamic memory, is if you need variable amounts, with different parts of the program having total demands that exceed the available 'pool'.
The main reason for problems is if anything changes ptr, or (obviously) if the code does not get to the de-allocation routine.
Remember also, that there is already a dynamic memory 'pool' directly implemented by the compiler. If you allocate a local variable, in a subroutine, when you leave that routine (provided the variable is not 'static'), the memory is available for re-use by the compiler.
There have been dozens of examples about the watchdog posted in the past. The 'point' of it, is that it allows you to ensure that if the processor hangs on a peripheral, or leaves the expected program 'path', a reset occurs. You have to program it with a timout interval, perhaps at least twice the gap between points in your program where you reset it (the oscillator involved is very inaccurate - at a 'nominal' 18mSec timeout, in some conditions of voltage/temperature, the actual timeout can be as low as 7mSec...). Then you have to ensure that if the program follows it's correct flow, and is running, 'restart_wdt' will be called often enough to prevent the timeout.

Best Wishes

[UFAnders]

I am trying to continue this thread avoid redundancy-->

I am trying to dynamically allocate a 2-dimensional array, one dimension being fixed. Here is my fixed structure size that will be an element within the array: