Defailt I2C pins for AiPi-UNO

I'm trying to use a AiPi-UNO with Arduino IDE. I'm trying to connect a I2C device. Does anybody know what the default I2C pins are or how to define the pins?

不知道，你可以用gpio模拟i2c的方法

Do you know how? With an ESP32 I would do it like this:
#include <Wire.h>
#define SDA_PIN 21
#define SCL_PIN 22

void setup(){
  Wire.begin(SDA_PIN, SCL_PIN);

This however does't work with the BL618

参考bl618G0板子的引脚定义

参考i2c demo

学习

跟着了解下

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