173 lines
3.4 KiB
C
173 lines
3.4 KiB
C
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/*
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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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* 2006-08-23 Bernard first implementation
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*/
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#include <rtthread.h>
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#include <rthw.h>
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#include <AT91SAM7S.h>
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#include "board.h"
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static void rt_hw_board_led_init(void);
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/**
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* @addtogroup sam7s
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*/
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/*@{*/
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/* Periodic Interval Value */
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#define PIV (((MCK/16)/1000)*(1000/RT_TICK_PER_SECOND))
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/**
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* This is the timer interrupt service routine.
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* @param vector the irq number for timer
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*/
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void rt_hw_timer_handler(int vector)
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{
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if (AT91C_PITC_PISR & 0x01)
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{
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/* increase a tick */
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rt_tick_increase();
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/* ack interrupt */
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AT91C_AIC_EOICR = AT91C_PITC_PIVR;
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}
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else
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{
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/* end of interrupt */
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AT91C_AIC_EOICR = 0;
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}
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}
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/* PIO Flash PA PB PIN */
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#define LED (1 << 8)/* PA8 & TWD NPCS3 43 */
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/**
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* This function will init led on the board
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*/
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static void rt_hw_board_led_init()
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{
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/* Enable Clock for PIO */
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AT91C_PMC_PCER = 1 << AT91C_ID_PIOA;
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/* configure PIO as output for led */
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AT91C_PIO_PER = LED;
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AT91C_PIO_OER = LED;
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}
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/**
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* This function will take the led on board on.
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*
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* @param n the number nth led
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*/
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void rt_hw_board_led_on()
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{
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AT91C_PIO_CODR = LED;
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}
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/**
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* This function will take the led on board off.
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*
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* @param n the number nth led
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*/
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void rt_hw_board_led_off()
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{
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AT91C_PIO_SODR = LED;
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}
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void rt_hw_led_flash()
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{
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int i;
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rt_hw_board_led_off();
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for (i = 0; i < 2000000; i ++);
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rt_hw_board_led_on();
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for (i = 0; i < 2000000; i ++);
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}
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/*
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* RT-Thread Console Interface, used by rt_kprintf
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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 (!(AT91C_US0_CSR & AT91C_US_TXRDY));
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AT91C_US0_THR = '\r';
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}
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/* Wait for Empty Tx Buffer */
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while (!(AT91C_US0_CSR & AT91C_US_TXRDY));
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/* Transmit Character */
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AT91C_US0_THR = *str;
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str ++;
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}
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}
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static void rt_hw_console_init()
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{
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/* Enable Clock for USART0 */
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AT91C_PMC_PCER = 1 << AT91C_ID_US0;
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/* Enable RxD0 and TxDO Pin */
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AT91C_PIO_PDR = (1 << 5) | (1 << 6);
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AT91C_US0_CR = AT91C_US_RSTRX | /* Reset Receiver */
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AT91C_US_RSTTX | /* Reset Transmitter */
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AT91C_US_RXDIS | /* Receiver Disable */
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AT91C_US_TXDIS; /* Transmitter Disable */
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AT91C_US0_MR = AT91C_US_USMODE_NORMAL | /* Normal Mode */
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AT91C_US_CLKS_CLOCK | /* Clock = MCK */
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AT91C_US_CHRL_8_BITS | /* 8-bit Data */
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AT91C_US_PAR_NONE | /* No Parity */
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AT91C_US_NBSTOP_1_BIT; /* 1 Stop Bit */
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/* set baud rate divisor */
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AT91C_US0_BRGR = BRD;
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AT91C_US0_CR = AT91C_US_RXEN | /* Receiver Enable */
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AT91C_US_TXEN; /* Transmitter Enable */
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}
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/**
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* This function will initial sam7s64 board.
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*/
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void rt_hw_board_init()
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{
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extern void rt_serial_init(void);
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/* init hardware console */
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rt_hw_console_init();
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/* init led */
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rt_hw_board_led_init();
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/* init PITC */
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AT91C_PITC_PIMR = (1 << 25) | (1 << 24) | PIV;
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/* install timer handler */
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rt_hw_interrupt_install(AT91C_ID_SYS, rt_hw_timer_handler, RT_NULL);
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AT91C_AIC_SMR(AT91C_ID_SYS) = 0;
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rt_hw_interrupt_umask(AT91C_ID_SYS);
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}
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/*@}*/
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