> For the complete documentation index, see [llms.txt](https://docs.petoi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.petoi.com/thai/biboard/demo-applications/1.gpio-port.md).

# 1.GPIO port

Operate the GPIO port of BiBoard

ไม่มีพอร์ต GPIO แยกต่างหากบน BiBoard แต่พอร์ตซีเรียลแบบมัลติเพล็กซ์ 2 (พิน 16, 17) หรือพิน PWM ของอินเทอร์เฟซเซอร์โว PWM ที่ไม่ได้ใช้สามารถใช้เป็นพอร์ต GPIO ได้ พอร์ต GPIO นั้นค่อนข้างใช้งานง่าย หลังจากกำหนดค่าโหมดอินพุตและเอาต์พุตแล้ว การใช้งานจะเหมือนกับ Arduino UNO ทุกประการ คุณสามารถใช้โปรแกรมควบคุม IO ของ Arduino UNO อะไรก็ได้ เพียงแค่เปลี่ยนจำนวนของ IO

```c
/* 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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