rt-thread/bsp/sep6200/drivers/board.c

/*
 * File		: board.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2013-7-14      Peng Fan     sep6200 implementation
 */

/**
 * @addtogroup sep6200
 */

/*@{*/
#include <rthw.h>
#include <rtthread.h>

#include <serial.h>

#include <sep6200.h>

void rt_hw_serial_putc(const char c);

#define UART0	((struct uartport *)SEP6200_UART0_BASE)

struct rt_device uart0_device;
struct serial_int_rx uart0_int_rx;
struct serial_device uart0 =
{
	UART0,
	&uart0_int_rx,
  RT_NULL
};

/*
 * This function will handle rtos timer
 */
void rt_timer_handler(int vector, void *param)
{
	rt_uint32_t clear_int;

	/* clear timer interrupt */
	if (read_reg(SEP6200_TIMER_T2IMSR) & 0x1)
		clear_int = read_reg(SEP6200_TIMER_T2ISCR);

	rt_tick_increase();
}

/*
 * This function will handle serial interrupt
 */
void rt_serial_handler(int vector, void *param)
{
	rt_uint32_t num;
	switch (vector) {
		case INTSRC_UART0:

      /*No interrupt*/
			if ((*(RP)SEP6200_UART0_IIR & 0x1))
				return;

      /*Get the serial interrupt num*/
			num = (*(RP)SEP6200_UART0_IIR >> 1) & 0x7;

      /*Receive or timeout*/
      if ((num == 6) || (num == 2))
			  rt_hw_serial_isr(&uart0_device);
			break;
		/*1,2,3 not implemented now, do in future*/
		case INTSRC_UART1:
			break;
		case INTSRC_UART2:
			break;
		case INTSRC_UART3:
			break;
	}
}

/*
 * This function will init timer2 for system ticks
 */
#define BUS4_FREQ	320000000UL
#define TIMER_CLK	BUS4_FREQ
#define HZ 100
void rt_hw_timer_init(void)
{
	*(RP)SEP6200_TIMER_T2LCR = (TIMER_CLK + HZ / 2) / HZ;
	*(RP)SEP6200_TIMER_T2CR	 = 0x6;

	rt_hw_interrupt_install(INTSRC_TIMER1, rt_timer_handler, RT_NULL, "timer");
	rt_hw_interrupt_umask(INTSRC_TIMER1);

	/* start the timer */
	*(RP)SEP6200_TIMER_T2CR |= 0x1;
}

/*
 * This function will init uart
 */
#define UART_CLK 60000000UL
void rt_hw_uart_init(void)
{
	const rt_uint32_t uartclk = UART_CLK;

	*(RP)(SEP6200_UART0_LCR) = 0x83;
	*(RP)(SEP6200_UART0_DLBH) = (uartclk/16/115200) >> 8;
	*(RP)(SEP6200_UART0_DLBL) = (uartclk/16/115200) & 0xff;
	*(RP)(SEP6200_UART0_LCR) = 0x83 & (~(0x1 << 7));

	*(RP)(SEP6200_UART0_FCR) = 0x0;
	*(RP)(SEP6200_UART0_MCR) = 0x0;

	*(RP)(SEP6200_UART0_IER) = 0x0;
	/* Enable rx interrupt*/
	*(RP)(SEP6200_UART0_IER) |= 0x1;
	/* Disable tx interrupt*/
	*(RP)(SEP6200_UART0_IER) &= ~(0x1 << 1);

	rt_hw_interrupt_install(INTSRC_UART0, rt_serial_handler, RT_NULL, "uart0");
	rt_hw_interrupt_umask(INTSRC_UART0);

	rt_hw_serial_register(&uart0_device, "uart0",
			RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
			&uart0);
}

void rt_hw_board_init(void)
{
  int i = 0;
	rt_hw_uart_init();
	rt_hw_timer_init();
}

/*
 * Write one char to serial, must not trigger interrupt
 */
void rt_hw_serial_putc(const char c)
{
	if (c == '\n')
		rt_hw_serial_putc('\r');

	while (!((*(RP)SEP6200_UART0_LSR) & 0x40));

	*(RP)(SEP6200_UART0_TXFIFO) = c;
}

/**
* This function is used by rt_kprintf to display a string on console.
*
* @param str the displayed string^M
*/
void rt_hw_console_output(const char *str)
{
  while (*str) {
    rt_hw_serial_putc(*str++);
  }
}

/*@}*/