// Create the handle for the driver.
pca9685_handle_t handle = {
    .i2c_handle = &hi2c1,
    .device_address = PCA9865_I2C_DEFAULT_DEVICE_ADDRESS,
    .inverted = false
};

// Initialise driver (performs basic setup).
pca9685_init(&handle);

// Set PWM frequency.
// The frequency must be between 24Hz and 1526Hz.
pca9685_set_pwm_frequency(&handle, 100.0f);

// Set the channel on and off times.
// The channel must be >= 0 and < 16.
// The on and off times must be >= 0 and < 4096.
// In this example, the duty cycle is (off time - on time) / 4096 = (2048 - 0) / 4096 = 50%
pca9685_set_channel_pwm_times(&handle, 0, 0, 2048);

// If you do not want to set the times by hand you can directly set the duty cycle. The last parameter
// lets you use a logarithmic scale for LED dimming applications.
pca9685_set_channel_duty_cycle(&handle, 1, 0.5f, false);