i2cmaster -> https://1drv.ms/u/s!Amsv72jI4yJwgaY1ShnIFVDL5F7ZtQ?e=E3H3vn

gy33_uc_i2c_chip.ino

#include <i2cmaster.h>

#define uint16_t unsigned int
typedef struct
{
  uint16_t Red;
  uint16_t Green;
  uint16_t Blue;
  uint16_t Clear;
} RGB;
unsigned char Re_buf;
unsigned char sign = 0;
RGB rgb;
uint16_t CT = 0, Lux = 0;
byte color = 0, rgb_data[3] = { 0 };

void setup() {
  Serial.begin(115200);
  i2c_init();
  delay(1);
}
void loop() {
  unsigned char data[9] = { 0 };
  if (!sign) {
    iic_read(0x00, data, 8);
    rgb.Red = (data[0] << 8) | data[1];
    rgb.Green = (data[2] << 8) | data[3];
    rgb.Blue = (data[4] << 8) | data[5];
    rgb.Clear = (data[6] << 8) | data[7];
    Serial.print("Red: ");
    Serial.print(rgb.Red);
    Serial.print(",Green: ");
    Serial.print(rgb.Green);
    Serial.print(",Blue");
    Serial.print(rgb.Blue);
    Serial.print(",Clear");
    Serial.println(rgb.Clear);
    iic_read(0x08, data, 4);
    Lux = (data[0] << 8) | data[1];
    CT = (data[2] << 8) | data[3];

    Serial.print("CT:");
    Serial.print(CT);
    Serial.print(",Lux:");
    Serial.println(Lux);
    iic_read(0x0c, data, 3);
    rgb_data[0] = data[0];
    rgb_data[1] = data[1];
    rgb_data[2] = data[2];
    Serial.print("r:");
    Serial.print(rgb_data[0]);
    Serial.print(",g:");
    Serial.print(rgb_data[1]);
    Serial.print(",b:");
    Serial.println(rgb_data[2]);
    iic_read(0x0f, data, 1);
    color = data[0];
    Serial.print(",color:");
    Serial.println(color, HEX);
  }
  if (sign == 1) {
    iic_read(0x10, &data[8], 1);
    i2c_start_wait(0xb4);
    i2c_write(0x10);
    i2c_write(0x31);
    // i2c_write((data[8]|0x01));
    i2c_stop();
    sign = 3;
  }
  delay(200);
}
void iic_read(unsigned char add, unsigned char *data, unsigned char len) {
  i2c_start_wait(0xb4);
  i2c_write(add);
  i2c_start_wait(0xb5);
  while (len - 1) {
    *data++ = i2c_readAck();
    len--;
  }
  *data = i2c_readNak();
  i2c_stop();
}
void serialEvent() {
  while (Serial.available()) {
    Re_buf = (unsigned char)Serial.read();
    if (Re_buf == 'a')
      sign = 0;
    if (Re_buf == 'b')
      sign = 1;
    Re_buf = 0;
  }
}