UART - 為 UART 通信設置回調函數

材料準備

  • AmebaD [AMB21 / AMB22 / AMB23 / BW16] x 1

  • USB-TTL 適配器 x 1

範例説明

這個例子展示瞭如何為UART通信設置一個回調函數來處理UART數據。

本例需要一個USB到TTL的適配器。確保已安裝驅動程序並如圖將其連接到Ameba板上。

AMB21 / AMB22 接線圖:

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AMB23 接線圖:

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BW16 接線圖:

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BW16-TypeC Wiring Diagram:

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Open the example in “File” → “Examples” → “AmebaSoftwareSerial” → “SoftwareSerial_Irq_Callback”

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Upload the code and press the reset button on Ameba once the upload is finished. Next, using a terminal program, such as TeraTerm or PuTTY, open a serial port and configure it according to the settings. Make sure the serial port number corresponds to the USB to TTL adapter.

  • Speed: 38400

  • Data: 8 bit

  • Parity: none

  • Stop bits: 1 bit

  • Flow control: none

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當串行口打開後，在串口終端中輸入並按回車鍵，就會看到相應的輸出。

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程式碼説明

mySerial.setAvailableCallback (mySerialCallback); 用於將函數mySerialCallback設置為軟件串行的回調函數。當接收到新字符時，回調函數檢查該字符是否與enter鍵相對應，如果返回值為真，則釋放信號標，從而允許主循環打印出之前接收到的所有字符。