README.md

PCA9535 Library

This Arduino library provides a simple interface for interacting with the PCA9535 I/O expander. It allows for easy reading and writing to the GPIOs with additional control over polarity and configuration.

Usage Instructions

Initialize the library with the I2C address of your PCA9535 chip and begin communication. Optionally, start the Wire library if it hasn't been started yet.

#include <PCA9535.h> // Make sure to include the PCA9535 library at the top of your sketch

// Define the I2C address for the PCA9535
uint8_t pcaAdress = 0x20;

// Create a PCA9535 object
PCA9535 pca(pcaAdress);
PCA9535 pca(pcaAdress, 1); // Initialize the library and optionally start the Wire library

void setup() {
// Setup configurations if necessary
}

void loop() {
// Reading input states from both GPIO groups
uint8_t inputGpio0 = pca.readInputGpioGroup0();
uint8_t inputGpio1 = pca.readInputGpioGroup1();

// Reading output states from both GPIO groups
uint8_t outputGpio0 = pca.readOutputGpioGroup0();
uint8_t outputGpio1 = pca.readOutputGpioGroup1();

// Reading polarity inversion registers from both GPIO groups
uint8_t polarityInversionGpio0 = pca.readPolarityInversionGroup0();
uint8_t polarityInversionGpio1 = pca.readPolarityInversionGroup1();

// Reading configuration registers from both GPIO groups
uint8_t configurationGpio0 = pca.readConfigurationGroup0();
uint8_t configurationGpio1 = pca.readConfigurationGroup1();

// Writing to output GPIO groups
pca.writeOutputGpioGroup0(uint8_t value);
pca.writeOutputGpioGroup1(uint8_t value);

// Writing to polarity inversion registers
pca.writePolarityInversionGroup0(uint8_t value);
pca.writePolarityInversionGroup1(uint8_t value);

// Writing to configuration registers
pca.writeConfigurationGroup0(uint8_t value);
pca.writeConfigurationGroup1(uint8_t value);
}

This library abstracts the intricacies of handling the PCA9535, providing straightforward methods for managing inputs, outputs, and configurations.