UART for LPC 2148

UART for LPC2148

//—————————————————————————————————————————————————————————————————————————//
// Program : UART example
// Description : Example for test UART1 interrupt mode
// Frequency : Crystal 12 MHz at PLL 5x(CCLK = 60 MHz),PCLK = 30 MHz
// Filename : uart_int.c
// C compiler : Keil CARM Compiler
//—————————————————————————————————————————————————————————————————————————//
#include “lpc214x.h” // Header file for Phillips LPC2148 controller
#include “uart.h” // Library for use module UART0,UART1
#include “stdio.h” // Library for use puts function(For UART1)
//—————————————— Function for Initial system clock ————————————————//
void init()
{
PLL0CFG=0x24; // MSEL = 4,PSEL = 2
PLL0FEED=0xAA; // Feed process
PLL0FEED=0x55;
PLL0CON=0x1;
PLL0FEED=0xAA; // Feed process
PLL0FEED=0x55;
while(!(PLL0STAT & 0x400)) ; // Wait until PLL Locked
PLL0CON=0x3; // Connect the PLL as the clock source
PLL0FEED=0xAA; // Feed process
PLL0FEED=0x55;
MAMCR=0x2; // Enabling MAM and setting number of clocks used for
// Flash memory fetch (4 cclks in this case)
MAMTIM=0x4;
VPBDIV=0x02; // PCLK at 30 MHz
}
//—————————————— Interrupt service routine for UART1 ———————————————//
void isr_uart1(void) __irq
{
char msg;
if(((msg = U1IIR) & 0x01) == 0) // Check status flag communication
{
switch (msg & 0x0E) // Filter message
{
case 0x04: while(!(U1LSR & 0x20)); // Receive Data Available
U1THR = U1RBR; // Echo character
break;
case 0x02: break; // Their Interrupt
default: break; // Other
}
}
VICVectAddr = 0; // Acknowledge Interrupt
}

 

Note: "uart.h"  is defined in previous post