Na, dann will ich dich mal nicht im Regen stehen lassen
.
Ich kann's nicht testen, weil ich die Hardware nicht besitze, aber das hier könnte klappen:
Code:
// prg: check buttons for codes
#define F_CPU 9000000UL
#include <util/delay.h>
#include <avr/io.h>
typedef uint8_t byte;
// button pins
// PINB3 is pin of button 1
// PINB4 is pin of button 2
// 0 means end of buttons
byte buttons[] = {PINB3, PINB4, 0};
// first 0 is for counting in function
// 1,1,2,1 is code
// last 0 is end of code
byte code1[] = {0, 1, 2, 2, 1, 0};
byte code2[] = {0, 2, 1, 2, 2, 0};
byte code3[] = {0, 2, 1, 1, 2, 2, 0};
byte* codes[] = {code1, code2, code3, 0};
// prototypes
byte isButtonPressed(byte pinNr);
void resetInput();
byte checkButtons(byte* button, byte* codes[], byte buttons[]);
// main
int main (void) {
DDRB = 0x06; // I/O ports PB1+PB2;
PORTB = 0x18; // activate pull up (PB3+PB4)
byte btn; // if a button is pressed this variable will know
while(1) {
byte code_nr = checkButtons(&btn, codes, buttons);
// codes switch LEDs
if (code_nr == 1) {
PORTB |= (1 << PINB2); // PB2 on
PORTB &= ~(1 << PINB1); // PB1 off
}
else if (code_nr == 2) {
PORTB |= (1<<PINB1); // PB1 on
PORTB &= ~(1<<PINB2); // PB2 off
}
else if (code_nr == 3) {
PORTB &= ~(1<<PINB1); // PB1 off
PORTB &= ~(1<<PINB2); // PB2 off
}
}
}
// functions
byte isButtonPressed(byte pinNr) {
byte pin = PINB;
return (pin & (1 << pinNr)) || (pin & (1 << pinNr)) || (pin & (1 << pinNr));
}
void resetInput() {
byte i = 0; while(codes[i]) { *codes[i++] = 0; }
}
byte checkButtons(byte* button, byte* codes[], byte buttons[]) {
static byte last_pressed_button = 0;
if (last_pressed_button) { // was button pressed last time?
if(isButtonPressed(buttons[last_pressed_button-1])) // is button still pressed?
return 0; // -> return
else {
last_pressed_button = 0; // else: not pressed anymore -> go on
}
}
*button = 0;
byte button_iterator = 0; // iterate over all buttons
byte code_iterator = 0; // iterate over all codes
while(buttons[button_iterator]) {
if(isButtonPressed(buttons[button_iterator])) { // check buttons one after another
*button = button_iterator + 1; // write pressed button number to external variable pressed_btn
last_pressed_button = *button; // store pressed button number
while(codes[code_iterator]) { // check all codes one after another
byte* code_pos_ptr = codes[code_iterator]; // first byte of codes array is for current position
if(codes[code_iterator][(*code_pos_ptr)+1] == button_iterator + 1) { // is the pressed button nr equal to next button nr in code?
(*code_pos_ptr)++; // -> next position
if(!codes[code_iterator][(*code_pos_ptr)+1]) { // code veryfied
resetInput(); // reset all counters
return code_iterator + 1; // returns number of detected code
}
}
else { *code_pos_ptr = 0; }
code_iterator++;
}
code_iterator = 0; // prepare for next button check
}
button_iterator++;
}
return 0; // 0 means no code veryfied
}
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