how do i get the state of the buttons(up,down,...) in C

[Lenny]

Hello,

how do i get the state of the buttons(up,down,...) in C (avr-gcc)?

The "Up"-Button is connected to the external-interrupt 4 as you can see her:
http://robosavvy.com/Builders/pepperm/CM-5%20Schematic%20V1.JPG

i use a interrupt-routine to catch the keypress-signal.

Code: Select all

SIGNAL (SIG_INTERRUPT4) //INT4 when Up-Key pressed
{
   PORTC &= ~_BV(PC3);  //turns AUX-LED on
}

has anyone a working code-snippet?

Bye
Lenny

[Lenny]

Hello,

i found the error. the pull-up resistor was not set for port E

Code: Select all

DDRE = 0;                  //set port E to input direction
PORTE |= _BV(PE4);    //enable pull-up resistor 4
EIMSK |= _BV(INT4);   //enable interrupt 4


Bye
Lenny

[StuartL]

Have you mapped the port uses of the CM5? it's something I intended to do but haven't got to yet...

[StuartL]

Scratch that question, the JPG you linked to contains everything I wanted to know, including that port F's A2D converters are free...

Hmm. 6 axis IMU on CM5 anyone?