board.c

RT-Thread是发展中的下一代微内核嵌入式实时操作系统

/*
 * 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
 * 2006-09-09     Vai          NDS implementation version
 */

#include <rtthread.h>
#include <rthw.h>

#include <fifo.h>
#include "nds.h"

/**
 * @addtogroup NDS
 */
/*@{*/

/*
 * Refer to NDSTech Wiki (http://www.bottledlight.com/ds/index.php/System/Timers)
 *
 * To make a timer overflow at a particular frequency, 
 * you set the latch accordingly. 
 * A timer with a latched value of 0 counting at 33.4 MHz / 1024 will overflow 
 * every 65536*1024 clocks, or about once every two seconds. 
 * To make the same timer overflow with a period of X seconds, 
 * the calculation looks like: 
 *
 * latch = 65536 - X*33400000/1024
 *
 */
#define DATA_COUNT	0xfeb8      /* 65535 - (0x02000000)/(1024 * 100) */

void rt_timer_handler(int vector)
{
	rt_tick_increase();

	return;
}

/*
void rt_keypad_interrupt(int vector)
{
    unsigned short keysPressed = ~(REG_KEYINPUT);
    
    // Based on the key pressed, move the shape.
    if(keysPressed & KEY_UP)
        rt_kprintf("KEY_UP\n");
    if(keysPressed & KEY_DOWN)
        rt_kprintf("KEY_DOWN\n");
    if(keysPressed & KEY_LEFT)
        rt_kprintf("KEY_LEFT\n");
    if(keysPressed & KEY_RIGHT)
        rt_kprintf("KEY_RIGHT\n");

    // Change the color of the shape if the relevant key was pressed.
    if(keysPressed & KEY_A)
        rt_kprintf("KEY_A\n");

    if(keysPressed & KEY_B)
        rt_kprintf("KEY_B\n");

    if(keysPressed & KEY_SELECT)
        rt_kprintf("KEY_SELECT\n");

    if(keysPressed & KEY_START)
        rt_kprintf("KEY_START\n");

    if(keysPressed & KEY_R)
        rt_kprintf("KEY_R\n");

    if(keysPressed & KEY_L)
        rt_kprintf("KEY_L\n");

    return;
}


void rt_keypad_init(void)
{
    REG_KEYCNT = 0x7fff;

    rt_hw_interrupt_install(NDS_KEYPAD, rt_keypad_interrupt, RT_NULL);
    rt_hw_interrupt_umask(NDS_KEYPAD);
}
*/
/*
#define BUTTON_X    1 << 0
#define BUTTON_Y    1 << 1
#define SCREEN_OFF  1 << 7

void rt_fifo_interrupt(int vector)
{
    unsigned int fifo_buffer;
    unsigned int type;
    unsigned int data;
    
    while (!(NDS_REG_IPCFIFOCNT & FIFO_EMPTY))
    {
        fifo_buffer = NDS_REG_IPCFIFORECV;
        type = FIFO_GET_TYPE(fifo_buffer);
        data = FIFO_GET_TYPE_DATA(fifo_buffer);

        switch (type)
        {
            case FIFO_FIRMWARE:
                rt_kprintf("Recv Firmware message\n");
                break;
            case FIFO_BUTTONS:
                break;
            case FIFO_TOUCH:
                rt_kprintf("x=%d y=%d\n",
                            (data & (0xff << 8)) >> 8, data & 0xff);
                break;
            case FIFO_TIME:
                rt_kprintf("Recv Time message\n");
                break;
            case FIFO_WIFI:
                rt_kprintf("Recv WIFI message\n");
                break;
            default:
                break;
        }
    }

    return;
}

void rt_fifo_init(void)
{
    NDS_REG_IPCFIFOCNT = FIFO_ENABLE | FIFO_IRQ_ENABLE | FIFO_CLEAR | FIFO_ERROR;
    
    rt_hw_interrupt_install(NDS_FIFO, rt_fifo_interrupt, RT_NULL);
    rt_hw_interrupt_umask(NDS_FIFO);

    return;
}
*/

/**
 * This function will init Nintendo DS console
 */
void rt_hw_board_init()
{
	volatile unsigned short	*tcp;

	tcp = (volatile unsigned short *) NDS_TIMER0_DATA;
	*tcp = DATA_COUNT;
	tcp = (volatile unsigned short *) NDS_TIMER0_CR;
	*tcp = (NDS_TCR_CLK1024 | NDS_TCR_ENB | NDS_TCR_IRQ);

	rt_hw_interrupt_install(NDS_INTTIMER0, rt_timer_handler, RT_NULL);
	rt_hw_interrupt_umask(NDS_INTTIMER0);

//    rt_fifo_init();
//    rt_keypad_init();

	return;
}

/*@}*/