variables problem - what is the difference

Forum 2005-2010 (read only) Software Syntax & Programs
#1

Hi guys,

I´m doing a little bit in programming a soundroutine and have this problem:

Introducing:

o1.amplitude_increment = int16_t o1.framecounter = uint32_t

this

 o1.amplitude_increment = int(32640/o1.framecounter);

seems not to be the same as

byte o1.amplitude_max = 9;

int32_t amplitude_max_array [10] PROGMEM = {32640,0,0,0,0,0,0,0,32640,32640};

[...]
 o1.amplitude_increment = int(amplitude_max_array[o1.amplitude_max]/o1.framecounter);

It seems to be an overflow, but I can´t see why. Which varible-type has to be amplitude_max_array?

Maybe, I´m too stupid. But I didn´t see the bug.

thanx!

#2

Please read http://www.arduino.cc/en/Reference/PROGMEM

With PROGMEM you need to use types like prog_int32_t, and access the array with a function like pgm_read_dword_near()

#3

Your´re right. Some mistakes are too stupid! Thanx!

;D

#4