UART -Code für ARM7 (LPC vom Philips)

#include <arch/philips/lpc2114.h>

#include "config.h" // Config-File with System Defines

#include <string.h>

#include <stdlib.h>

#include "uart.h"

char uart0_rx_buffer;

char uart0_buf_len=0;

void uart_init(int baud, char num){

  unsigned int UART_DIVISOR=0;

  if(num==0){

    UART0_IER = 0x00;             // disable all interrupts

    UART0_IIR = 0x00;             // clear interrupt ID register

    UART0_LSR = 0x00;             // clear line status register

    //Setting the UART Divisor Latch

    UART0_LCR = (1<<7);

    UART_DIVISOR = (((FOSC*PLL_M/VPBDIV_VAL) / ((baud) * 16.0)) + 0.5);

//Calculate UART Divisor Latch

    UART0_DLL = (char)UART_DIVISOR; // Setting lower Byte of the Latch

Divisor

    UART0_DLM = (char)(UART_DIVISOR >> 8); // Setting upper Byte of the

Latch Divisor

    UART0_LCR = (3<<0); // 8bit Char Length

    UART0_FCR = (1<<0) | (2<<6); // FIFO Enable (Bit0 = 1) + Trigger

level 2 = 8 Characters (at Bit6 = 2 )

    UART0_IER = (1<<0); // Receive Data Available Interrupt enablen

  }else{

    UART1_IER = 0x00;             // disable all interrupts

    UART1_IIR = 0x00;             // clear interrupt ID register

    UART1_LSR = 0x00;             // clear line status register

    //Setting the UART Divisor Latch

    UART1_LCR = (1<<7);

    UART_DIVISOR = (((FOSC*PLL_M/VPBDIV_VAL) / ((baud) * 16.0)) + 0.5);

//Calculate UART Divisor Latch

    UART1_DLL = (char)UART_DIVISOR; // Setting lower Byte of the Latch

Divisor

    UART1_DLM = (char)(UART_DIVISOR >> 8); // Setting upper Byte of the

Latch Divisor

    UART1_LCR = (3<<0); // 8bit Char Length

    UART1_FCR = (1<<0) | (2<<6); // FIFO Enable (Bit0 = 1) + Trigger

level 2 = 8 Characters (at Bit6 = 2 )

    UART1_IER = (1<<0); // Receive Data Available Interrupt enablen

  }

}

void uart_putc(char c,char num){

  char ULSR_THRE;

  ULSR_THRE=(1 << 5);

  while (!(UART0_LSR & ULSR_THRE))          // wait for TX buffer to

empty

    continue;                           // also either WDOG() or

swap()

  UART0_THR = c;  // put char to Transmit Holding Register

}

void uart_puts(char *s,char num){

  while(*s){

    uart_putc(*s,num);

  s++;

  }

}

int uart_getcW(int num){

  char ULSR_RDR;

    ULSR_RDR=(1 << 0);

  while ( !(UART0_LSR & ULSR_RDR) ); // wait for character 

  return UART0_RBR;                // return character

}

#ifndef UART_H_

#define UART_H_

#include <arch/philips/lpc2114.h>

#include "config.h" // Config-File with System Defines

#include <stdlib.h>

#define UIIR_MASK 7; // 00000111

char uart0_rx_buffer;

char uart0_buf_len;

/* Init UART */

void uart_init(int baud, char num);

/* Put Char to UART */

void uart_putc(char c,char num);

/* Put String to UART */

void uart_puts(char *s,char num);

/* Get Character from UART(num) with Wait

The function waits for an appearing character in the recieve register

and will continue then

*/

int uart_getcW(int num);

#endif