Very long back one project published in ELEKTOR about decoder for morse code. He used a microcontroller . I don't know hich oen he used .He claims that his program can decode morse code . Also we have to purchase his programmed chip.

So if you can talk to ELEKTOR magazine people you can get the article.

Also i have some inputs to give you upon decoding the morse code . If human do the coding then it is very difficult to write a program to decode since the timings for DIT and DASHes will not be perfect.

Now a days people use computer to do morse coding so that the timings will be perfect also you can get higher speed. Computer coded morse code will be decoded without much difficulty . only thing is that first you have to detect the speed.

LAL