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
 * 2006-08-23     Bernard      first implementation
 */

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

#include <AT91SAM7S.h>

static void rt_hw_board_led_init();

/**
 * @addtogroup icdevs64
 */
/*@{*/

#define TCK  1000                           /* Timer Clock  */
#define PIV  ((MCK/TCK/16)-1)               /* Periodic Interval Value */

/** 
 * This is the timer interrupt service routine.
 *
 */
void rt_hw_timer_handler(int vector)
{
	if (AT91C_PITC_PISR & 0x01)
	{
		/* increase a tick */
		rt_tick_increase();
		
		/* ack interrupt */
		AT91C_AIC_EOICR = AT91C_PITC_PIVR;
	}
	else 
	{
		/* end of interrupt */
		AT91C_AIC_EOICR = 0;
	}
}

						/* PIO   Flash    PA    PB   PIN */ 
#define LED1 (1 << 0)	/* PA0 / PGMEN0 & PWM0 TIOA0  48 */ 
#define LED2 (1 << 1)	/* PA1 / PGMEN1 & PWM1 TIOB0  47 */ 
#define LED3 (1 << 2)	/* PA2          & PWM2 SCK0   44 */ 
#define LED4 (1 << 8)	/* PA3          & TWD  NPCS3  43 */ 
#define LED_MASK		(LED1|LED2|LED3|LED4)

/** 
 * This function will init led on the board
 */
static void rt_hw_board_led_init()
{
	/* enable the clock of the PIO */
	AT91C_PMC_PCER = 1 << 2;

	/* configure PIO as output for led */
	AT91C_PIO_PER = LED_MASK;
	AT91C_PIO_OER = LED_MASK;
}

/** 
 * This function will take the led on board on.
 *
 * @param n the number nth led
 */
void rt_hw_board_led_on(int n)
{
	if (n == 4) n = 8;
	AT91C_PIO_CODR = 1 << n;
}

/** 
 * This function will take the led on board off.
 *
 * @param n the number nth led
 */
void rt_hw_board_led_off(int n)
{
	if (n == 4) n = 8;
	AT91C_PIO_SODR = 1 << n;
}

/**
 * This function will init icdev AT91SAM7S board
 */
void rt_hw_board_init()
{
	/* init led */
	rt_hw_board_led_init();
	
	/* install timer handler */
	rt_hw_interrupt_install(AT91C_ID_SYS, rt_hw_timer_handler, RT_NULL);

	/* init PITC */
	AT91C_PITC_PIMR = (1 << 25) | (1 << 24) | PIV;
	rt_hw_interrupt_umask(AT91C_ID_SYS);
}

/*@}*/