# 未來板MicroPython編程13：I2C

### 導入未來板庫

需要先導入未來板的庫才可以使用未來板的硬件。

```
from future import *
```

### 13: I2C

### 初始化I2C

```
i2c = I2C(0)  # 使用預設的I2C接口
i2c = I2C(1, scl=Pin(5), sda=Pin(4), freq=400000) # 使用2支引腳作為I2C接口
```

### 掃描I2C模塊位置

```
i2c.scan()
```

### I2C讀取數據

```
i2c.readfrom(address,nbytes)
```

* address為I2C模塊的地址。
* nbytes為所讀取數據的長度。

### I2C讀取數據至列表

```
I2C.readfrom_into(addr, buf)
```

* address為I2C模塊的地址。
* 所讀取的數據會儲存到buf裡面，buf必須為bytearray。

### I2C寫入數據

```
i2c.writeto(address,buf)
```

* address為I2C模塊的地址。
* buf為寫入的數據，數據必須為byte或bytearray類型。

### I2C寫入向量

```
i2c.writevto(address,vector)
```

* address為I2C模塊的地址。
* vector為寫入的向量。

### I2C從記憶體讀取

```
I2C.readfrom_mem(address, memaddr, nbytes, *, addrsize=8)
```

* address為I2C模塊的地址。
* memaddr為記憶體的地址。
* nbytes為所讀取數據的長度。
* addrsize為記憶體的大小。

### I2C從記憶體讀取至列表

```
I2C.readfrom_mem_into(address, memaddr, buf, *, addrsize=8)
```

* address為I2C模塊的地址。
* memaddr為記憶體的地址。
* 所讀取的數據會儲存到buf裡面，buf必須為bytearray。
* addrsize為記憶體的大小。

### I2C寫入數據到記憶體

```
I2C.writeto_mem(address, memaddr, buf, *, addrsize=8)
```

* address為I2C模塊的地址。
* memaddr為記憶體的地址。
* buf為寫入的數據，數據必須為byte或bytearray類型。
* addrsize為記憶體的大小。


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://sharinghub.kittenbot.hk/mcu/futureboard/micropython/api13.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.