GPIO interrupt for different pins in PSoC 1 - c

Question

I have faced a problem connected with GPIO interrupt.
The task is to make a simple UI interface, so I need to use 3 buttons.
The problem is that I don't understand how to use GPIO interrupt for different pins and all my buttons work the same way.
here is the code:
#include <m8c.h> // part specific constants and macros
#include "PSoCAPI.h" // PSoC API definitions for all User Modules
#include <stdio.h>
#include <stdlib.h>
typedef struct {
int value; // the actual value which is used in the module
char string[16]; // string that is printed in LCD for user
} UI_ELEMENT;
#define FIRST_LEVEL 3
#define SECOND_LEVEL 3
#define PWM 0
#define PGA 1
#define ADC 2
#define PWM_STATE 0
#define PWM_PERIOD 1
#define PWM_WIDTH 2
#define PWM_STATE_OFF 0
#define PWM_STATE_ON 1
volatile int buttonRightPressed = 0;
#pragma interrupt_handler buttonRightInt
void buttonRightInt(void){
// disable button interrupt
M8C_DisableIntMask(INT_MSK0, INT_MSK0_GPIO);
buttonRightPressed = 1;
}
void initialize_LCD(void){
LCD_Position(0,0);
LCD_PrCString("PWM");
LCD_Position(1,0);
LCD_PrCString("< select >");
}
void update_LCD(int* lvl1){
if (*lvl1 == PWM || *lvl1 == 3){
LCD_Position(0,0);
LCD_PrCString("PWM");
*lvl1 = 0;
}
else if (*lvl1 == PGA){
LCD_Position(0,0);
LCD_PrCString("PGA");
}
else if (*lvl1 == ADC){
LCD_Position(0,0);
LCD_PrCString("ADC");
}
}
void main(void)
{
UI_ELEMENT userInterface[FIRST_LEVEL][SECOND_LEVEL];
int level_1_steper = PWM;
int i;
M8C_EnableGInt ; // Uncomment this line to enable Global Interrupts
PWM8_EnableInt();
LCD_Start();
M8C_EnableIntMask(INT_MSK0, INT_MSK0_GPIO);
initialize_LCD(); // set 'PWM' for upper row, '< select >' for lower row
while (1){
if (buttonRightPressed == 1){
for ( i = 0; i < 350; i++);
level_1_steper++;
update_LCD(&level_1_steper);
buttonRightPressed = 0;
// enable button interrupt again
M8C_EnableIntMask(INT_MSK0, INT_MSK0_GPIO);
}
}
}

Answer 1

Problem resolved! As usually solution is quite simple: use GPIO interrupt but test which button has been pressed. GPIO iterrupt:
void buttonInt(void){ // disable button interrupt
M8C_DisableIntMask(INT_MSK0, INT_MSK0_GPIO);
if (Right_Data_ADDR & Right_MASK) buttonRightPressed = 1;
if (Left_Data_ADDR & Left_MASK) buttonLeftPressed = 1;
if (Select_Data_ADDR & Select_MASK) buttonSelectPressed = 1;
}