ARM Communication Protocol : UART
Revision as of 16:15, 17 March 2015 by Amruta (Talk | contribs)

Amruta (talk) 13:22, 17 March 2015 (IST)

Basics

LPC1768 has 4 UARTS out of which UART0, UART2, UART3 are very similar while UART1 is little bit different from all these.

Registers

Let's have a brief review through some of the important UART registers.

RBR ( Receiver Buffer Register )

THR ( Transmit Holding Register )

DLL ( Divisor Latch LSB register )

DLM ( Divisor Latch MSB register )

FCR ( FIFO Control Register )

LCR ( Line Control Register )

LSR ( Line Status Register )

Schematic

Code

Let's make a Decimal Counter with UART .

Initialize the UART0 with 9600 baud-rate.

Display the initial message and go on displaying incremented count taking some pause.

To know more about UART library, check this. 

  1. #include "lpc17xx.h" //Device specific header file
  2. #include "uart.h"	//Explore Embedded UART library which contains the uart routines
  3. #include "delay.h" //Explore Embedded  library containing the delay routines
  4.  
  5. /* start the main program */
  6. int main()
  7. {
  8. 	uint16_t cnt=0;
  9.  
  10.         /* Setup and initialize the microcontroller system */
  11. 	SystemInit();
  12.  
  13. 	/* Initialize the UART before Transmitting/Receiving any data */
  14. 	UART_Init(UART0,9600);
  15.  
  16. 	UART_Printf("5digit decimal counter: ");
  17.  
  18. 	/* Transmit the counter till 9999 */
  19. 	while(cnt < 9999)
  20. 	{
  21. 		/* Transmit the 4-digit counter value and go to next line */
  22. 		UART_Printf("\n\r%4u",cnt);
  23.  
  24. 		/* Increment the counter value after 1-sec */
  25. 		DELAY_sec(1);
  26. 		cnt++;
  27. 	}
  28. 	while(1);
  29. }

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