[arduino code examples for F24]-02 Read digital input ports state by XL9555 chip

Code:
/*

 * Made by KinCony IoT: https://www.kincony.com

 *

 * Description:

 * This Arduino program reads the state of two 16-channel XL9555SS I/O expanders

 * and prints the state of all input pins (1-24) to the Serial Monitor. The state of 

 * each pin is represented as a bit in a 24-bit value, where each bit corresponds 

 * to an input pin. The program prints the input state in binary format.

 *

 * Pin Definitions:

 * - SDA: GPIO 8

 * - SCL: GPIO 18

 * - XL9555SS I2C Address: 0x24 for inputs 1-16, 0x26 for inputs 17-24

 */



#include "Arduino.h"

#include <Wire.h>

#include <PCA95x5.h>



// Define I2C pins

#define I2C_SDA 8  // Define SDA pin

#define I2C_SCL 18  // Define SCL pin



constexpr uint8_t INPUT_ADDR_1 = 0x24;

constexpr uint8_t INPUT_ADDR_2 = 0x26;

PCA9555 inputIO1;

PCA9555 inputIO2;



void setup() {

    Serial.begin(115200);



    // Initialize I2C communication

    Wire.begin(I2C_SDA, I2C_SCL); // Initialize I2C with defined SDA and SCL pins



    // Configure both expanders for the input-only test.

    inputIO1.attach(Wire, INPUT_ADDR_1);

    inputIO1.polarity(PCA95x5::Polarity::ORIGINAL_ALL);

    inputIO1.direction(PCA95x5::Direction::IN_ALL);



    // Read only ports 0-7 on 0x26. Leave the relay ports undriven.

    inputIO2.attach(Wire, INPUT_ADDR_2);

    inputIO2.polarity(PCA95x5::Polarity::ORIGINAL_ALL);

    inputIO2.direction(PCA95x5::Direction::IN_ALL);



    Serial.println("KinCony F24 24 channel input state 0:ON  1:OFF");

}



void loop() {

    // DI1-16 occupy bits 0-15; DI17-24 occupy bits 16-23.

    const uint32_t first = inputIO1.read();

    const uint32_t second = inputIO2.read() & 0x00FFU;

    const uint32_t state = first | (second << 16);



    // Print the state of all 24 inputs in binary format

    Serial.print("Input state: ");

    Serial.println(state, BIN); // Print the state of inputs in binary



    delay(500); // Delay 500ms

}