# begin

{% tabs %}
{% tab title="常见用法" %}

## 函数原型

```cpp
void Serial.begin(long speed);
```

## 作用

初始化串口，指定串口数据传播速率(波特率)

## 参数

* `pin`

  指定引脚的编号，如： `10` , `A0` 等。

## 示例

```cpp
Serial.begin(9600);             // 一般将波特率设为9600
```

{% endtab %}

{% tab title="高级用法" %}

## 函数原型

```cpp
void Serial.begin(long speed, uint8_t config);
```

## 参数

* `pin`

  指定引脚的编号，如： `10` , `A0` 等。
* `config`

  可选，很少用到，可能的值如下：

  |     config可选配置    | 数据位 | 校验位 | 停止位 |
  | :---------------: | :-: | :-: | :-: |
  |    SERIAL\_5N1    |  5  |  无  |  1  |
  |    SERIAL\_6N1    |  6  |  无  |  1  |
  |    SERIAL\_7N1    |  7  |  无  |  1  |
  | SERIAL\_8N1(默认配置) |  8  |  无  |  1  |
  |    SERIAL\_5N2    |  5  |  无  |  2  |
  |    SERIAL\_6N2    |  6  |  无  |  2  |
  |    SERIAL\_7N2    |  7  |  无  |  2  |
  |    SERIAL\_8N2    |  8  |  无  |  2  |
  |    SERIAL\_5E1    |  5  |  偶  |  1  |
  |    SERIAL\_6E1    |  6  |  偶  |  1  |
  |    SERIAL\_7E1    |  7  |  偶  |  1  |
  |    SERIAL\_8E1    |  8  |  偶  |  1  |
  |    SERIAL\_5E2    |  5  |  偶  |  2  |
  |    SERIAL\_6E2    |  6  |  偶  |  2  |
  |    SERIAL\_7E2    |  7  |  偶  |  2  |
  |    SERIAL\_8E2    |  8  |  偶  |  2  |
  |    SERIAL\_5O1    |  5  |  奇  |  1  |
  |    SERIAL\_6O1    |  6  |  奇  |  1  |
  |    SERIAL\_7O1    |  7  |  奇  |  1  |
  |    SERIAL\_8O1    |  8  |  奇  |  1  |
  |    SERIAL\_5O2    |  5  |  奇  |  2  |
  |    SERIAL\_6O2    |  6  |  奇  |  2  |
  |    SERIAL\_7O2    |  7  |  奇  |  2  |
  |    SERIAL\_8O2    |  8  |  奇  |  2  |

## 示例

```cpp

Serial.begin(9600, SERIAL_8E2); // 将串口波特率设为9600，数据位8，偶校验，停止位2。
```

{% endtab %}
{% endtabs %}


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