doubts on ARM TUTORIAL : uart

Nevermind, I fixed the problem by enabling FIFOs

please can anyone explain to me where we can use RXD0 and TXD0 ???

hi
m trying to setup Uart1 of lpc2148 to receive byte using interrupt
i have written d code for it
when a byte is rxd interupt occurs isr function is executed correctly but only 1 time.
when anohter byte is sent execution doesnt enter isr. m sure there might b a problem with my code but m not able to find 1
code
main.c:
#include "lcd.h"
#include "test.h"
#include "serial.h"
int main (void)
{
init_lcd();
Test_Lcd();
Uart1_Init();
Uart1_Tx('A');
while (1)
{
}
}


serial.c:
#include <LPC21xx.H>
#include "lcd.h"

#define TEMT (1<<6)
//****************************************************************
// Function name : Uart1_Tx
// Parameters : unsigned char Tx_Data
// Return Parameter : None
// Description : Transmits the Tx_Data to Uart1
//
//****************************************************************
void Uart1_Tx(unsigned char Tx_Data)
{
while(!(U1LSR & TEMT));
U1THR = Tx_Data;
}
//****************************************************************
// Function name : Uart1_Irq
// Parameters : None
// Return Parameter : None
// Description : Uart1 Rx ISR
//****************************************************************
void Uart1_Irq()
{
unsigned char Data;
lcd_putstring(0," Uart1 IRQ ");
Data = U1RBR;
Uart1_Tx(Data);
VICVectAddr = 0; //end of interrupt
lcd_putstring(1," done ");
}
//****************************************************************
// Function name : Uart1_Init
// Parameters : None
// Return Parameter : None
// Description : Initializes Uart1 for 8 data bit, 1 stop bit
// no parity and 9600 Baud rate*
//****************************************************************
void Uart1_Init()
{
PINSEL0 = 0x00050000; //init pins for uart1 rxd1 & txd1
U1LCR = 0x83; //8bit data, 1 stop bit, no parity
U1DLL = 97; //9600 baud rate
//U1DLL = 24; //38400 baud rate
U1LCR = 0x03; //dlab disable
U1IER = 0x01; //Uart1 RBR interrupt enable
VICProtection = 0; //Diable protection
VICIntSelect &= 0xffffff7f; // select Uart1 Interrupt as IRQ
VICVectAddr0 = (unsigned int)Uart1_Irq;//Assigning isr Addr
VICVectCntl0 = 0x20 | 7;
VICIntEnable |= 0x00000080; //enable uart1 interrupt
}

plz help find missing code
thanks n regards
naqsh

sorry
i found d issue
i had missed adding __irq to void Uart1_Irq()
ie Uart1_Irq() __irq{
so plz ignore
thanks anyways
regards
naqsh

Excellent tutorial @Shyam. I am a newbie to ARM .Things seem clearer to me.. I could not find a continuation link to the above thread. pls post if any.

link for the thread:
www.8051projects.net/forum-t4311-10.html

I could not find a continuation link to the above thread. pls post if any.

Pawankumar

Which link are you talkin about? Please let me know I will look into it.

hi Ajay,
the thread is : ARM tutorial : UART
link for the thread is: http://www.8051projects.net/forum-t4311-0.html
its a great tutorial. shyam has closed the thread without discussing the following as proposed

4.sending a byte of data.
5. receiving a byte of data.
6. using in interrupt.
7.difference between polled and interrupt mode
or am I lost somewhere?

P.S: am not able to use the hyperlink option excuse me.

hi can any1 plz guide me to setup printf function to work with uart using stdio.h?
i did some trial n error but didnt find success. so waiting for reply
regards
naqsh

@naqsh.salim
take a look at this...
http://www.keil.com/support/man/docs/gsac/gsac_lowlevelroutinesarm.htm

please help . I am trying to interface GPS module with LPC2148. I have written a code to get data from GPS through UART1 and send it to hyperterminal through UART0. This code does not work. where am i wrong?

#include<lpc214x.h>

void inituart1()						  //initializes both UARTS at 9600 baud
{
U1LCR=0x83;
U1DLL=0x61;
U1DLM=0x00;
U1LCR=0x03;
U0LCR=0x83;
U0DLL=0x61;
U0DLM=0x00;
U0LCR=0x03;
}

void send(unsigned char a)							//sends a byte through U0
{
U0THR=a;
while(U0LSR!=0x60);
}
void senduart1(unsigned char a)						  //sends a byte through U1
{
U1THR=a;
while(U1LSR!=0x60);
}
unsigned char recuart1()										// recieves a byte from U1
{
unsigned char p;
while ((U1LSR&0x01)!=1);
p=U1RBR;
return p;
}
unsigned char rec()											// recieves a byte from U0
{
unsigned char p;
while ((U0LSR&0x01)!=1);
p=U0RBR;
return p;
}
int main()
{

PINSEL0=0x00050005;								   //initialized U0 and U1 as UART and not GPIO
PINSEL1 = 0x00000000;
PINSEL2 = 0x00000000;
inituart1();
while(1)
{
send(recuart1());


}
}