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