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serial transmission through LPC2138

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hardik_297p

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i am doing serial communication between ARM(lp2138) and Matlab,
so for that I first i trying to sent data on terminal, but i am not getting proper data on terminal
(here i am getting 0xF8 while i transmitting 0x41)

please kindly help me.


Code: 
/*keil programm for transmitting data*/

#include <LPC213x.H>

int main(void)  {              

  PINSEL0 = 0x00050000;                  /* Enable RxD1 and TxD1              */
  U1LCR = 0x83;                          /* 8 bits, no Parity, 1 Stop bit     */
   U1DLL =71;
  U1DLM=0;
  U1FDR=131;                            /* 9600 Baud Rate @ 15MHz Clock  */
 U1LCR = 0x03;

 while (!(U1LSR & 0x60));
   U1THR=0x41;       /* transmitting 'a' */
i attached My proteus screenshot here

} proteus.png
 
Last edited by a moderator:

lpc2138 @12 MHz crystal

Code: 
VPBDIV=4;
PINSEL0 = 0x00050000;    // Enable UART1
U1LCR=0X80;      //DLAB 1
U1DLM=0X0;	   //DLM 0X0  			   //9600 no parity 1 stop bit 8bit 
U1DLL=0X61;    //DLL 0X61
U1LCR=0X03;	   //DLAB 0X3


U1THR=0x41;											 
while (!(U1LSR & 0x20));
 
Thx for replay....ur code works.but still i am in confuse that by baudrate calculation formulae we get U1DLL=97(0x61) by 15Mhz. for 12Mhz it may be 78.
 

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