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
 * 2006-03-24     Bernard      first implementation
 * 2006-05-05     Bernard      add DATA_COUNT definition
 * 2006-10-05     Alsor.Z      for s3c2410x porting
 * 2007-11-20     Yi.Qiu	   add lcd,touch,console
 */

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

#include <s3c2410.h>

/**
 * @addtogroup s3ceb2410
 */
/*@{*/

extern rt_uint32_t PCLK;
extern rt_uint32_t FCLK;
extern rt_uint32_t HCLK;
extern rt_uint32_t UCLK;

extern rt_uint8_t asc16_font[];
extern rt_uint16_t _rt_hw_framebuffer[];

extern void rt_hw_touch_init(void);
extern void rt_hw_lcd_init(void);
extern void rt_console_init(rt_uint8_t*, rt_uint8_t*, rt_uint8_t);
extern void rt_hw_mmu_init();

extern void rt_hw_get_clock(void);
extern void rt_hw_set_clock(rt_uint8_t sdiv, rt_uint8_t pdiv, rt_uint8_t mdiv);
extern void rt_hw_set_dividor(rt_uint8_t hdivn, rt_uint8_t pdivn);

static rt_uint32_t timer_load_val = 0;

void rt_timer_handler(int vector)
{
	/* reset TDATA0 */
	TCNTB4 = timer_load_val;

	rt_tick_increase();
}

/**
 * This function will init s3ceb2410 board
 */
void rt_hw_board_init()
{
	/* FCLK = 304.8M */
	#define MDIV		68
	#define PDIV		1
	#define SDIV		1
	//rt_hw_set_clock(SDIV, PDIV, MDIV);
	/* HCLK = PCLK = FCLK */
	rt_hw_set_dividor(0, 0);

	/* use PWM Timer 4 because it has no output */
	/* prescaler for Timer 4 is 16 */
	TCFG0 = 0x0f00;

	/* all divider = 1/2 */
	TCFG1 = 0x0;

	rt_hw_get_clock();

	if (timer_load_val == 0)
	{
		/*
		 * for 10 ms clock period @ PCLK with 4 bit divider = 1/2
		 * (default) and prescaler = 16. Should be 10390
		 * @33.25MHz and 15625 @ 50 MHz
		 */
		timer_load_val = PCLK/(2 * 16 * 100);
	}
	/* load value for 10 ms timeout */
	TCNTB4 = timer_load_val;
	/* auto load, manual update of Timer 4 */
	TCON = (TCON & ~0x0700000) | 0x600000;
	/* auto load, start Timer 4 */
	TCON = (TCON & ~0x0700000) | 0x500000 | 0x3;
	/*Enable NAND, USBD, PWM TImer, UART0,1 and GPIO clock,*/
	CLKCON = 0xfffff0;

#ifndef RT_USING_EMULATOR
	/* init mmu system */
	rt_hw_mmu_init();
#else
	lowlevel_init();
#endif

	rt_hw_lcd_init();
	//rt_console_init(&_rt_hw_framebuffer[0], &asc16_font[0], 2);

#ifdef RT_USING_RTGUI
	rt_hw_touch_init();
#endif

	/* install interrupt handler */
	rt_hw_interrupt_install(INTTIMER4, rt_timer_handler, RT_NULL);
	rt_hw_interrupt_umask(INTTIMER4);

	/* stop timer 	*/
	/* TCON = 0x0;	*/
}

#ifdef RT_USING_FINSH
extern void finsh_notify(void);
void rt_serial_isr(int vector)
{
	INTSUBMSK |= (BIT_SUB_RXD0);

	finsh_notify();

	SUBSRCPND |= BIT_SUB_RXD0;
	/*Unmask sub interrupt (RXD0)*/
	INTSUBMSK  &=~(BIT_SUB_RXD0);
}

void rt_hw_finsh_init()
{
	/* install UART isr */
	INTSUBMSK &= ~(BIT_SUB_RXD0);

	rt_hw_interrupt_install(INTUART0, rt_serial_isr, RT_NULL);
	rt_hw_interrupt_umask(INTUART0);
}

#endif

/*@}*/