rt-thread/bsp/lpc2478/board.c

108 lines
2.0 KiB
C

/*
* File : board.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006, RT-Thread Develop Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://openlab.rt-thread.com/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2008-12-11 xuxinming first version
*/
#include <rtthread.h>
#include <rthw.h>
#include <LPC24xx.h>
#include "board.h"
/* #define RT_BOARD_DEBUG */
#define DATA_COUNT 14400000/RT_TICK_PER_SECOND /* T0MR0 = delayInMs * (Fpclk / 1000); */
/**
* @addtogroup LPC2478
*/
/*@{*/
void rt_timer_handler(int vector)
{
#ifdef BOARD_DEBUG
rt_kprintf("timer handler, increase a tick\n");
#endif
T0IR |= 0x01; /* clear interrupt flag */
rt_tick_increase();
VICVectAddr = 0; /* Acknowledge Interrupt */
}
/**
* This function is used to display a string on console, normally, it's
* invoked by rt_kprintf
*
* @param str the displayed string
*/
void rt_hw_console_output(const char* str)
{
while (*str)
{
if (*str=='\n')
{
while (!(U0LSR & 0x20));
U0THR = '\r';
}
while (!(U0LSR & 0x20));
U0THR = *str;
str ++;
}
}
#define BAUD_RATE 115200
#define U0PINS 0x50
void rt_hw_console_init()
{
rt_uint32_t fdiv;
/* Enable RxD and TxD pins */
PINSEL0 = U0PINS;
/* 8 bits, no Parity, 1 Stop bit */
U0LCR = 0x83;
/* Setup Baudrate */
fdiv = ( PCLK / 16 ) / BAUD_RATE ; /*baud rate */
U0DLM = fdiv / 256;
U0DLL = fdiv % 256;
U0FCR = 0x00; /* Enable and reset TX and RX FIFO. */
U0LCR = 0x03; /* DLAB = 0 */
/* DLAB = 0 */
U0LCR = 0x03;
}
/**
* This function will init LPC2478 board
*/
void rt_hw_board_init()
{
/* init console for rt_kprintf function */
rt_hw_console_init();
T0IR = 0xff;
T0TC = 0;
T0MCR = 0x03;
T0MR0 = (DATA_COUNT);
rt_hw_interrupt_install(TIMER0_INT, rt_timer_handler, RT_NULL);
rt_hw_interrupt_umask(TIMER0_INT);
T0TCR = 0x01; //enable timer0 counter
}
/*@}*/