rt-thread/bsp/upd70f3454/uart.c

/*
 * File      : board.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2009 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://www.rt-thread.org/license/LICENSE
 *
 * Change Logs:
 * Date           Author           Notes
 * 2010-03-08     Bernard          The first version for LPC17xx
 * 2010-06-29     lgnq             Modified for V850
*/

#include <rthw.h>
#include <rtthread.h>
#include "io70f3454.h"
#include "uart.h"

#if defined(RT_USING_UART0) && defined(RT_USING_DEVICE)

struct rt_uart_v850
{
	struct rt_device parent;

	/* buffer for reception */
	rt_uint8_t read_index, save_index;
	rt_uint8_t rx_buffer[RT_UART_RX_BUFFER_SIZE];
}uart_device;

void  uarta1_receive_handler(void)
{
	rt_ubase_t level;
	rt_uint8_t	 c;

    struct rt_uart_v850* uart = &uart_device;

//	while(ri_u0c1 == 0)
//		;
	c = (char) UA1RX;

	/* Receive Data Available */
    uart->rx_buffer[uart->save_index] = c;

    level = rt_hw_interrupt_disable();
	uart->save_index ++;
    if (uart->save_index >= RT_UART_RX_BUFFER_SIZE)
        uart->save_index = 0;
    rt_hw_interrupt_enable(level);

	/* invoke callback */
	if(uart->parent.rx_indicate != RT_NULL)
	{
	    rt_size_t length;
	    if (uart->read_index > uart->save_index)
            length = RT_UART_RX_BUFFER_SIZE - uart->read_index + uart->save_index;
        else
            length = uart->save_index - uart->read_index;

        uart->parent.rx_indicate(&uart->parent, length);
	}
}

static rt_err_t rt_uart_init (rt_device_t dev)
{
	UA1TXE = 0U;	/* disable UARTA1 transmission operation */
	UA1RXE = 0U;	/* disable UARTA1 reception operation */
	UA1PWR = 0U;	/* disable UARTA1 operation */
	UA1TMK = 1U;	/* disable INTUA1T interrupt */
	UA1TIF = 0U;	/* clear INTUA1T interrupt flag */
	UA1RMK = 1U;	/* disable INTUA1R interrupt */
	UA1RIF = 0U;	/* clear INTUA1R interrupt flag */
	/* Set INTUA1T level low priority */
	UA1TIC |= 0x07U;
	/* Set INTUA1R level low priority */
	UA1RIC |= 0x07U;
    //BAUDRATE = 9600
	UA1CTL1 = _03_UARTA_BASECLK_FXX_16;
	UA1CTL2 = _11_UARTA1_BASECLK_DIVISION;
	UA1CTL0 = _10_UARTA_TRANSFDIR_LSB | _00_UARTA_PARITY_NONE | _02_UARTA_DATALENGTH_8BIT | _00_UARTA_STOPLENGTH_1BIT;
	UA1OPT0 = _14_UARTA_UAnOPT0_INITIALVALUE | _00_UARTA_TRAN_DATALEVEL_NORMAL | _00_UARTA_REC_DATALEVEL_NORMAL;
	UA1PWR = 1U;	/* enable UARTA1 operation */
	/* Set TXDA1 pin */
	/* Set RXDA1 pin */
	PFC3_bit.no0	= 0;
	PFCE3_bit.no0	= 0;
	PMC3_bit.no0	= 1;

    PFC3_bit.no1	= 0;
	PFCE3_bit.no1	= 0;
	PMC3_bit.no1	= 1;
    
	return RT_EOK;
}

static rt_err_t rt_uart_open(rt_device_t dev, rt_uint16_t oflag)
{
	RT_ASSERT(dev != RT_NULL);
	if (dev->flag & RT_DEVICE_FLAG_INT_RX)
	{
		/* Enable the UART Interrupt */
	    UA1TIF = 0U;	/* clear INTUA1T interrupt flag */
	    UA1TMK = 1U;	/* disable INTUA1T interrupt */
	    UA1RIF = 0U;	/* clear INTUA1R interrupt flag */
	    UA1RMK = 0U;	/* enable INTUA1R interrupt */
	    UA1TXE = 1U;	/* enable UARTA1 transmission operation */
	    UA1RXE = 1U;	/* enable UARTA1 reception operation */
	}

	return RT_EOK;
}

static rt_err_t rt_uart_close(rt_device_t dev)
{
	RT_ASSERT(dev != RT_NULL);
	if (dev->flag & RT_DEVICE_FLAG_INT_RX)
	{
		/* Disable the UART Interrupt */
	    UA1TXE = 0U;	/* disable UARTA1 transmission operation */
	    UA1RXE = 0U;	/* disable UARTA1 reception operation */
	    UA1TMK = 1U;	/* disable INTUA1T interrupt */
	    UA1TIF = 0U;	/* clear INTUA1T interrupt flag */
	    UA1RMK = 1U;	/* disable INTUA1R interrupt */
	    UA1RIF = 0U;	/* clear INTUA1R interrupt flag */
	}

	return RT_EOK;
}

static rt_size_t rt_uart_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
{
	rt_uint8_t* ptr;
	struct rt_uart_v850 *uart = (struct rt_uart_v850*)dev;
	RT_ASSERT(uart != RT_NULL);

	/* point to buffer */
	ptr = (rt_uint8_t*) buffer;
	if (dev->flag & RT_DEVICE_FLAG_INT_RX)
	{
		while (size)
		{
			/* interrupt receive */
			rt_base_t level;

			/* disable interrupt */
			level = rt_hw_interrupt_disable();
			if (uart->read_index != uart->save_index)
			{
				*ptr = uart->rx_buffer[uart->read_index];

				uart->read_index ++;
				if (uart->read_index >= RT_UART_RX_BUFFER_SIZE)
					uart->read_index = 0;
			}
			else
			{
				/* no data in rx buffer */

				/* enable interrupt */
				rt_hw_interrupt_enable(level);
				break;
			}

			/* enable interrupt */
			rt_hw_interrupt_enable(level);

			ptr ++;
			size --;
		}

		return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
	}

	return 0;
}

static rt_size_t rt_uart_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
{
	char *ptr;
	ptr = (char*)buffer;

	if (dev->flag & RT_DEVICE_FLAG_STREAM)
	{
		/* stream mode */
		while (size)
		{
			if (*ptr == '\n')
			{
                while(UA1TSF == 1U)
                    ;
                UA1TX = '\r';
			}

			/* THRE status, contain valid data */
            while(UA1TSF == 1U)
                ;
            UA1TX = *ptr;
  
			ptr ++;
			size --;
		}
	}
	else
	{
		while ( size != 0 )
		{
			/* THRE status, contain valid data */
            while(UA1TSF == 1U)
                ;
            UA1TX = *ptr;
	
			ptr++;
			size--;
		}
	}

	return (rt_size_t) ptr - (rt_size_t) buffer;
}

void rt_hw_uart_init(void)
{
	struct rt_uart_v850* uart;

	/* get uart device */
	uart = &uart_device;

	/* device initialization */
	uart->parent.type = RT_Device_Class_Char;
	rt_memset(uart->rx_buffer, 0, sizeof(uart->rx_buffer));
	uart->read_index = uart->save_index = 0;

	/* device interface */
	uart->parent.init 	    = rt_uart_init;
	uart->parent.open 	    = rt_uart_open;
	uart->parent.close      = rt_uart_close;
	uart->parent.read 	    = rt_uart_read;
	uart->parent.write      = rt_uart_write;
	uart->parent.control    = RT_NULL;
	uart->parent.user_data  = RT_NULL;

	rt_device_register(&uart->parent,
		"uart0", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STREAM | RT_DEVICE_FLAG_INT_RX);
}
#endif /* end of UART */

/*@}*/