# 1. GPIO例程

BiBoard没有单独的GPIO，但是复用的串口2（16，17脚）或没有使用的PWM舵机接口的PWM脚可以用作GPIO。BiBoard的GPIO使用也相对简单，配置输入输出模式后和UNO的用法完全相同。您可以使用任何Arduino UNO的IO控制控制程序，更改IO号即可。

```
/* In this demo, we use TX2, RX2 as general purpose IO
*   TX2 : IO17
*   RX2 : IO16
*/

void setup() {
  // initialize digital pin 16 & 17 as an output.
  pinMode(16, OUTPUT);
  pinMode(17, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
    
  digitalWrite(16, HIGH);            // GPIO 16 & 17 HIGH
  digitalWrite(17, HIGH);
  delay(1000);                       // wait for a second

  digitalWrite(16, LOW);             // GPIO 16 & 17 LOW
  digitalWrite(17, LOW);
  delay(1000);                       // wait for a second
}
```


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