ARM LPC2138/48 Mini Development Board – UART1 Interfacing

In ARM LPC2138/48 Mini Development Board, UART1 is accessible through connector K12 that has 3 pins namely GND,TXD1 & RXD1.

  • TXD1 – Transmission pin of UART1 (P0.8)  
  • RXD1 – Reception pin of UART1 (P0.9)
  • GND  – Common ground

SchematicSample CodeSample code to test both transmission & reception of UART1 module is given below. The code is such that initially it transmits the string “Checking UART1″  and on receiving a character, the same gets retransmitted.

OutputFlash the code into the controller and connect it to PC using suitable interface.. Various steps to check the output using RealTerm are given below.

  • Step 1: Launch RealTerm

  • Step 2: RealTerm opens as shown below

  • Step 3: Go to ‘Port’ option, set correct baudrate (which is set as 9600 in the sample code) and correct port

  • Step 4: Click ‘Change’ (encircled in red) to apply the changes. Now check the status of Port. If it is closed, click ‘Open’ button (encircled in green) to open it.

  • Step 5: The data transmitted from the board can be viewed as shown below.

  • Step 6: To check reception, go to Send option, type the string in the space provided(encircled in green) and click Send ASCII button. The first “hello” in green colour is  transmitted from PC & that in yellow colour is retransmitted by the controller

Topics related to ARM LPC2138/48 Mini Development Board

  1. ARM LPC2138/48 Mini Development Board – Overview
  2. ARM LPC2138/48 Mini Development Board – LED Interfacing
  3. ARM LPC2138/48 Mini Development Board – LCD Interfacing
  4. ARM LPC2138/48 Mini Development Board – UART0 Interfacing
  5. ARM LPC2138/48 Mini Development Board – UART1 Interfacing
  6. ARM LPC2138/48 Mini Development Board – Switches Interfacing
  7. ARM LPC2138/48 Mini Development Board – BUZZER Interfacing
  8. ARM LPC2138/48 Mini Development Board – POT Interfacing (ADC)
  9. ARM LPC2138/48 Mini Development Board – Temperature Sensor Interfacing(ADC)
  10. ARM LPC2138/48 Mini Development Board – Interfacing Servo motor
  11. ARM LPC2138/48 Mini Development Board – Internal Real Time Clock (RTC)
  12. ARM LPC2148 Mini Development Board – USB Interfacing (Human Interface Device)

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