Legal Removal Request

Post: Hello Guys! I am writing to you because we have a problem with Programming and using IO Pi Plus in C. I have read a lot of discussions about this topic, but we couldn't manage to solve our problem yet.Our problem is that we would like to connect a lot of buttons to the IO Pi Plus and use their signal as interrupts.(We are using a RPI 3B+) We want the pins 1-8 of port0 of the bus2 to trigger the IA of the bus2. The IA port is connected to one of the GPIOs of the Raspberry Pi 3B+ which is initialized as an interrupt. Our problem is, that we can't get any feedback from the buttons. In the wiring we don't use a level-shifter, but voltage divider(an 1k Ohm resistor and an 1,8k Ohm resistor) and so we get 3,22 Volt. There was a one time occasion,that we got a printout from the read_interrupt_capture function as we were constantly pushing our button. It was something like that: Port 0 7f Port 0 7f Port 0 7f Port 0 fe Port 0 fe It was a pretty random answer.. We had one wired button on the pin1 of the port0 of the bus1. Since then we checked all wireings. This is our code: #include "stdio.h" #include "stdlib.h" #include "string.h" #include "signal.h" #include "unistd.h" #include #include "ABE_IoPi.h" #include #include #include #define BUTTON 25 void callBut() { printf("Port 0 %x \n",read_interrupt_capture(0x21, 0)); } int main(int argc, char* argv[]) { IOPi_init(0x21); // initialise one of the io pi buses on i2c address 0x20 set_port_pullups( 0x21, 0, 0x00); //set the internal 100K pull-up resistors for the selected IO port set_port_direction(0x21, 0, 0xFF); // set the direction for bank 0 to be outputs invert_port(0x21, 0, 0xFF); //invert the polarity of the pins on a selected port set_interrupt_polarity(0x21, 0); //This sets the polarity of the char output pins. mirror_interrupts( 0x21, 1); // Set the interrupt pins to be mirrored or for separate ports set_interrupt_defaults( 0x21, 0, 0xFF); set_interrupt_type( 0x21, 0, 0xFF); //Sets the type of interrupt for each pin on the selected port set_interrupt_on_port( 0x21, 0, 0xFF); reset_interrupts( 0x21); wiringPiSetupGpio(); pinMode(BUTTON,INPUT); pullUpDnControl(BUTTON,PUD_UP); wiringPiISR(BUTTON,INT_EDGE_FALLING,&callBut); while(1) { } } Can anyone help us solve this problem? Any advice and/or help is welcomed! Best regards, Andrew