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/*
* 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>
#include "board.h"
static void rt_hw_board_led_init(void);
/**
* @addtogroup sam7s
*/
/*@{*/
/* Periodic Interval Value */
#define PIV (((MCK/16)/1000)*(1000/RT_TICK_PER_SECOND))
/**
* This is the timer interrupt service routine.
* @param vector the irq number for timer
*/
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 LED (1 << 8)/* PA8 & TWD NPCS3 43 */
/**
* This function will init led on the board
*/
static void rt_hw_board_led_init()
{
/* Enable Clock for PIO */
AT91C_PMC_PCER = 1 << AT91C_ID_PIOA;
/* configure PIO as output for led */
AT91C_PIO_PER = LED;
AT91C_PIO_OER = LED;
}
/**
* This function will take the led on board on.
*
* @param n the number nth led
*/
void rt_hw_board_led_on()
{
AT91C_PIO_CODR = LED;
}
/**
* This function will take the led on board off.
*
* @param n the number nth led
*/
void rt_hw_board_led_off()
{
AT91C_PIO_SODR = LED;
}
void rt_hw_led_flash()
{
int i;
rt_hw_board_led_off();
for (i = 0; i < 2000000; i ++);
rt_hw_board_led_on();
for (i = 0; i < 2000000; i ++);
}
/*
* RT-Thread Console Interface, used by rt_kprintf
*/
/**
* 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 (!(AT91C_US0_CSR & AT91C_US_TXRDY));
AT91C_US0_THR = '\r';
}
/* Wait for Empty Tx Buffer */
while (!(AT91C_US0_CSR & AT91C_US_TXRDY));
/* Transmit Character */
AT91C_US0_THR = *str;
str ++;
}
}
static void rt_hw_console_init()
{
/* Enable Clock for USART0 */
AT91C_PMC_PCER = 1 << AT91C_ID_US0;
/* Enable RxD0 and TxDO Pin */
AT91C_PIO_PDR = (1 << 5) | (1 << 6);
AT91C_US0_CR = AT91C_US_RSTRX | /* Reset Receiver */
AT91C_US_RSTTX | /* Reset Transmitter */
AT91C_US_RXDIS | /* Receiver Disable */
AT91C_US_TXDIS; /* Transmitter Disable */
AT91C_US0_MR = AT91C_US_USMODE_NORMAL | /* Normal Mode */
AT91C_US_CLKS_CLOCK | /* Clock = MCK */
AT91C_US_CHRL_8_BITS | /* 8-bit Data */
AT91C_US_PAR_NONE | /* No Parity */
AT91C_US_NBSTOP_1_BIT; /* 1 Stop Bit */
/* set baud rate divisor */
AT91C_US0_BRGR = BRD;
AT91C_US0_CR = AT91C_US_RXEN | /* Receiver Enable */
AT91C_US_TXEN; /* Transmitter Enable */
}
/**
* This function will initial sam7s64 board.
*/
void rt_hw_board_init()
{
extern void rt_serial_init(void);
/* init hardware console */
rt_hw_console_init();
/* init led */
rt_hw_board_led_init();
/* init PITC */
AT91C_PITC_PIMR = (1 << 25) | (1 << 24) | PIV;
/* install timer handler */
rt_hw_interrupt_install(AT91C_ID_SYS, rt_hw_timer_handler, RT_NULL);
AT91C_AIC_SMR(AT91C_ID_SYS) = 0;
rt_hw_interrupt_umask(AT91C_ID_SYS);
}
/*@}*/
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