Lpc2000

Hi Everybody ,

First of all , Merry Christams and I hope  a happy new year for everybody.

May be already answered but I couldn't find it . I tried to read data
from UART0 by initializing exactly based around Insider Guide  book
from Hitex . I could not receive data by Hyperterminal . After
checking all parameters , I used  Oscilloscope and I had serial data
with correct baud rate .  Another software was used but the same
problem exist.

I tried to read data by loop baking UART0 and 1 .  ( only connecting
2< - - > 3) with the same initializing  and I saw  serial data on line.
By overriding putchar ( ) for writing data and getchar ( ) to read
data but it didn't read anything . Any advice is welcomed , it's my code ;

void UART0 (void)	
{
PINSEL0 = 0x05; 		// Select TxD and RxD on pin connect block
U0LCR = 0x80;			//Enable programming of divisor latches

U0DLL = 0xC2;			//Program the divisor latch for 19200 baud
U0DLM = 0x00;

U0LCR = 0x33;			//Program the line control 8\N\1
U0FCR = 0x4F;			//enable the FIFO's

}
void UART1 (void)
{
PINSEL0 |=0x050000;
U1LCR = 0x80;			//Enable programming of divisor latches

U1DLL = 0xC2;			//Program the divisor latch for 19200 baud
U1DLM = 0x00;

U1LCR = 0x33;			//Program the line control 8\N\1
U1FCR = 0x4F;			
} 

int putchar (int ch) 
{                    /* Write character to Serial Port  */
  
  if (ch == '\n')  
  {
    while (!(U0LSR & 0x20));
    U0THR = CR;                          /* output CR */
  }
  while (!(U0LSR & 0x20));

  return (U0THR=ch);
}

int getchar (void)
{
   while(!(U1LSR & 0x01 ));
   return (U1RBR);
}

Hello Majid,
          I followed this approach for UART0
communication: One thing which is worth mentioning
here is that:

DLAB=0 while receiving or transmitting the data.




#include<LPC213x.h>
#include<stdio.h>

void UART0_Init(void);
void UART0_Write(char);

void main()
{
	int i;
	char s[]="UART0 Communication..";

	UART0_Init();
	//printf("HE IS THE ETERNAL\n");

	while(1)
	{
		i=0;
		while (s[i]!= '\0')
		{
			UART0_Write(s[i]);
			i++;
		} 
	}
		
}

void UART0_Init(void)
{

 PINSEL0=0x00000005; /* Enable RxD0 and TxD0 */
 U0FCR=0x07;      /* Tx FIFO, Rx FIFO and FIFO eanable
	*/
 U0LCR=0x92;	/* DLAB=1, Even Parity=1, WLS=7 bits 	*/
 U0DLL=0x97;				/* Baud Rate */
 U0DLM=0x00;
 U0LCR=0x12;
}

void UART0_Write(char c)
{
	while(!(U0LSR & 0x20)); // Check U0LSR_bit.THRE for 1
	U0THR=c;
}


Hope this will work for you....

Regards

--- majid_mokhtari <majid_mokhtari@...> wrote:


---------------------------------
Hi Everybody ,

First of all , Merry Christams and I hope  a happy new
year for everybody.

May be already answered but I couldn't find it . I
tried to read data
from UART0 by initializing exactly based around
Insider Guide  book
from Hitex . I could not receive data by Hyperterminal
. After
checking all parameters , I used  Oscilloscope and I
had serial data
with correct baud rate .  Another software was used
but the same
problem exist.

I tried to read data by loop baking UART0 and 1 .  (
only connecting
2< - - > 3) with the same initializing  and I saw 
serial data on line.
By overriding putchar ( ) for writing data and getchar
( ) to read
data but it didn't read anything . Any advice is
welcomed , it's my code ;

void UART0 (void)      
{
PINSEL0 = 0x05;             // Select TxD and RxD on
pin connect block
U0LCR = 0x80;                  //Enable programming of
divisor latches

U0DLL = 0xC2;                  //Program the divisor
latch for 19200 baud
U0DLM = 0x00;

U0LCR = 0x33;                  //Program the line
control 8\N\1
U0FCR = 0x4F;                  //enable the FIFO's

}
void UART1 (void)
{
PINSEL0 |=0x050000;
U1LCR = 0x80;                  //Enable programming of
divisor latches

U1DLL = 0xC2;                  //Program the divisor
latch for 19200 baud
U1DLM = 0x00;

U1LCR = 0x33;                  //Program the line
control 8\N\1
U1FCR = 0x4F;                  
} 

int putchar (int ch) 
{                    /* Write character to Serial Port
 */
  
  if (ch == '\n')  
  {
    while (!(U0LSR & 0x20));
    U0THR = CR;                          /* output CR
*/
  }
  while (!(U0LSR & 0x20));

  return (U0THR=ch);
}

int getchar (void)
{
   while(!(U1LSR & 0x01 ));
   return (U1RBR);
}









  
    
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> May be already answered but I couldn't find it . I tried to read data
> from UART0 by initializing exactly based around Insider Guide  book
> from Hitex . I could not receive data by Hyperterminal . After
> checking all parameters , I used  Oscilloscope and I had serial data
> with correct baud rate .  Another software was used but the same
> problem exist.

If you confirmed correct baud rate and you see data being sent from target
there are still two possibilities:

1.  Improper pin-out of RS-232 cable
2.  Baud rate mismatch between target and host

If these are ok, try dropping to a baud with 0% error.


Alternative to Hyperterminal (free):
http://hp.vector.co.jp/authors/VA002416/teraterm.html


Joel