rt-thread/bsp/mb9bf506r/drivers/fm3_uart.c

/*
 * File      : fm3_uart.c
 * mb9bf506r uart driver
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006 - 2012, RT-Thread Development 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
 * 2012-05-15     lgnq         first  version.
 * 2012-05-28     heyuanjie87  change interfaces
 */

#include <rtthread.h>
#include <rtdevice.h>
#include "fm3_uart.h"

#if (defined(RT_USING_UART0_0) || defined(RT_USING_UART0_1))
/* UART0 device driver structure */
struct serial_ringbuffer uart0_int_rx;
struct uart03_device uart0 =
{
	FM3_MFS0_UART,
	MFS0RX_IRQn,
	MFS0TX_IRQn,
};
struct rt_serial_device serial0;

void MFS0RX_IRQHandler(void)
{
	/* enter interrupt */
	rt_interrupt_enter();
	rt_hw_serial_isr(&serial0);
	/* leave interrupt */
	rt_interrupt_leave();
}
#endif

#if (defined(RT_USING_UART1_0) || defined(RT_USING_UART1_1))
/* UART1 device driver structure */
struct serial_ringbuffer uart1_int_rx;
struct uart03_device uart1 =
{
	FM3_MFS1_UART,
	MFS1RX_IRQn,
	MFS1TX_IRQn,
};
struct rt_serial_device serial1;

void MFS1RX_IRQHandler(void)
{
	/* enter interrupt */
	rt_interrupt_enter();
	rt_hw_serial_isr(&serial1);
	/* leave interrupt */
	rt_interrupt_leave();
}
#endif

#if (defined(RT_USING_UART2_0) || defined(RT_USING_UART2_1) || defined(RT_USING_UART2_2))
/* UART2 device driver structure */
struct serial_ringbuffer uart2_int_rx;
struct uart03_device uart2 =
{
	FM3_MFS2_UART,
	MFS2RX_IRQn,
	MFS2TX_IRQn,
};
struct rt_serial_device serial2;

void MFS2RX_IRQHandler(void)
{
	/* enter interrupt */
	rt_interrupt_enter();
	rt_hw_serial_isr(&serial2);
	/* leave interrupt */
	rt_interrupt_leave();
}
#endif

#if (defined(RT_USING_UART3_0) || defined(RT_USING_UART3_1) || defined(RT_USING_UART3_2))
/* UART3 device driver structure */
struct serial_ringbuffer uart3_int_rx;
struct uart03_device uart3 =
{
	FM3_MFS3_UART,
	MFS3RX_IRQn,
	MFS3TX_IRQn,
};
struct rt_serial_device serial3;

void MFS3RX_IRQHandler(void)
{
	/* enter interrupt */
	rt_interrupt_enter();
	rt_hw_serial_isr(&serial3);
	/* leave interrupt */
	rt_interrupt_leave();
}
#endif

#if (defined(RT_USING_UART4_0) || defined(RT_USING_UART4_1) || defined(RT_USING_UART4_2))
/* UART4 device driver structure */
struct serial_ringbuffer uart4_int_rx;
struct uart47_device uart4 =
{
	FM3_MFS4_UART,
	MFS4RX_IRQn,
	MFS4TX_IRQn,
	FIFO_SIZE,
};
struct rt_serial_device serial4;

void MFS4RX_IRQHandler(void)
{
	/* enter interrupt */
	rt_interrupt_enter();
	rt_hw_serial_isr(&serial4);
	/* leave interrupt */
	rt_interrupt_leave();
}
#endif

#if (defined(RT_USING_UART5_0) || defined(RT_USING_UART5_1) || defined(RT_USING_UART5_2))
/* UART5 device driver structure */
struct serial_ringbuffer uart5_int_rx;
struct uart47_device uart5 =
{
	FM3_MFS5_UART,
	MFS5RX_IRQn,
	MFS5TX_IRQn,
	FIFO_SIZE,
};
struct rt_serial_device serial5;

void MFS5RX_IRQHandler(void)
{
	/* enter interrupt */
	rt_interrupt_enter();
	rt_hw_serial_isr(&serial5);
	/* leave interrupt */
	rt_interrupt_leave();
}
#endif

#if (defined(RT_USING_UART6_0) || defined(RT_USING_UART6_1))
/* UART6 device driver structure */
struct serial_ringbuffer uart6_int_rx;
struct uart47_device uart6 =
{
	FM3_MFS6_UART,
	MFS6RX_IRQn,
	MFS6TX_IRQn,
	FIFO_SIZE,
};
struct rt_serial_device serial6;

void MFS6RX_IRQHandler(void)
{
	/* enter interrupt */
	rt_interrupt_enter();
	rt_hw_serial_isr(&serial6);
	/* leave interrupt */
	rt_interrupt_leave();
}
#endif

#if (defined(RT_USING_UART7_0) || defined(RT_USING_UART7_1))
/* UART7 device driver structure */
struct serial_ringbuffer uart7_int_rx;
struct uart47_device uart7 =
{
	FM3_MFS7_UART,
	MFS7RX_IRQn,
	MFS7TX_IRQn,
	FIFO_SIZE,
};
struct rt_serial_device serial7;

void MFS7RX_IRQHandler(void)
{
	/* enter interrupt */
	rt_interrupt_enter();
	rt_hw_serial_isr(&serial7);
	/* leave interrupt */
	rt_interrupt_leave();
}

#endif

void uart_pin_setup(void)
{
#if defined(RT_USING_UART0_0)
	/* Set UART Ch0 Port, SIN0_0(P21), SOT0_0(P22) */
	FM3_GPIO->PFR2_f.P1 = 1;
	FM3_GPIO->PFR2_f.P2 = 1;
	FM3_GPIO->EPFR07_f.SIN0S0 = 1;
	FM3_GPIO->EPFR07_f.SIN0S1 = 0;
	FM3_GPIO->EPFR07_f.SOT0B0 = 1;
	FM3_GPIO->EPFR07_f.SOT0B1 = 0;
#elif defined(RT_USING_UART0_1)
	/* Set UART Ch0 Port, SIN0_1(P14), SOT0_1(P15) */
	FM3_GPIO->PFR1_f.P4 = 1;
	FM3_GPIO->PFR1_f.P5 = 1;
	FM3_GPIO->EPFR07_f.SIN0S0 = 0;
	FM3_GPIO->EPFR07_f.SIN0S1 = 1;
	FM3_GPIO->EPFR07_f.SOT0B0 = 0;
	FM3_GPIO->EPFR07_f.SOT0B1 = 1;
#endif

#if defined(RT_USING_UART1_0)
	/* Set UART Ch1 Port, SIN1_0(P56), SOT1_0(P57) */
	FM3_GPIO->PFR5_f.P6 = 1;
	FM3_GPIO->PFR5_f.P7 = 1;
	FM3_GPIO->EPFR07_f.SIN1S0 = 1;
	FM3_GPIO->EPFR07_f.SIN1S1 = 0;
	FM3_GPIO->EPFR07_f.SOT1B0 = 1;
	FM3_GPIO->EPFR07_f.SOT1B1 = 0;
#elif defined(RT_USING_UART1_1)
	/* Set UART Ch1 Port, SIN1_1(P11), SOT1_1(P12) */
	FM3_GPIO->PFR1_f.P1 = 1;
	FM3_GPIO->PFR1_f.P2 = 1;
	FM3_GPIO->EPFR07_f.SIN1S0 = 0;
	FM3_GPIO->EPFR07_f.SIN1S1 = 1;
	FM3_GPIO->EPFR07_f.SOT1B0 = 0;
	FM3_GPIO->EPFR07_f.SOT1B1 = 1;
#endif

#if defined(RT_USING_UART2_0)
	/* Set UART Ch2 Port, SIN2_0(P72), SOT2_0(P73) */
	FM3_GPIO->PFR7_f.P2 = 1;
	FM3_GPIO->PFR7_f.P3 = 1;
	FM3_GPIO->EPFR07_f.SIN2S0 = 1;
	FM3_GPIO->EPFR07_f.SIN2S1 = 0;
	FM3_GPIO->EPFR07_f.SOT2B0 = 1;
	FM3_GPIO->EPFR07_f.SOT2B1 = 0;
#elif defined(RT_USING_UART2_1)
	/* Set UART Ch2 Port, SIN2_1(P24), SOT2_1(P25) */
	FM3_GPIO->PFR2_f.P4 = 1;
	FM3_GPIO->PFR2_f.P5 = 1;
	FM3_GPIO->EPFR07_f.SIN2S0 = 0;
	FM3_GPIO->EPFR07_f.SIN2S1 = 1;
	FM3_GPIO->EPFR07_f.SOT2B0 = 0;
	FM3_GPIO->EPFR07_f.SOT2B1 = 1;
#elif defined(RT_USING_UART2_2)
	/* Set UART Ch2 Port, SIN2_2(P17), SOT2_2(P18) */
	FM3_GPIO->PFR1_f.P7 = 1;
	FM3_GPIO->PFR1_f.P8 = 1;
	FM3_GPIO->EPFR07_f.SIN2S0 = 1;
	FM3_GPIO->EPFR07_f.SIN2S1 = 1;
	FM3_GPIO->EPFR07_f.SOT2B0 = 1;
	FM3_GPIO->EPFR07_f.SOT2B1 = 1;
#endif

#if defined(RT_USING_UART3_0)
	/* Set UART Ch3 Port, SIN3_0(P66), SOT3_0(P67) */
	FM3_GPIO->PFR6_f.P6 = 1;
	FM3_GPIO->PFR6_f.P7 = 1;
	FM3_GPIO->EPFR07_f.SIN3S0 = 1;
	FM3_GPIO->EPFR07_f.SIN3S1 = 0;
	FM3_GPIO->EPFR07_f.SOT3B0 = 1;
	FM3_GPIO->EPFR07_f.SOT3B1 = 0;
#elif defined(RT_USING_UART3_1)
	/* Set UART Ch3 Port, SIN3_1(P50), SOT3_1(P51) */
	FM3_GPIO->PFR5_f.P0 = 1;
	FM3_GPIO->PFR5_f.P1 = 1;
	FM3_GPIO->EPFR07_f.SIN3S0 = 0;
	FM3_GPIO->EPFR07_f.SIN3S1 = 1;
	FM3_GPIO->EPFR07_f.SOT3B0 = 0;
	FM3_GPIO->EPFR07_f.SOT3B1 = 1;
#elif defined(RT_USING_UART3_2)
	/* Set UART Ch3 Port, SIN3_2(P48), SOT3_2(P49) */
	FM3_GPIO->PFR4_f.P8 = 1;
	FM3_GPIO->PFR4_f.P9 = 1;
	FM3_GPIO->EPFR07_f.SIN3S0 = 1;
	FM3_GPIO->EPFR07_f.SIN3S1 = 1;
	FM3_GPIO->EPFR07_f.SOT3B0 = 1;
	FM3_GPIO->EPFR07_f.SOT3B1 = 1;
#endif

#if defined(RT_USING_UART4_0)
	/* Set UART Ch4 Port, SIN4_0(P0A), SOT4_0(P0B), CTS4_0(P0E), RTS4_0(P0D) */
	FM3_GPIO->PFR0_f.PA = 1;
	FM3_GPIO->PFR0_f.PB = 1;
	FM3_GPIO->PFR0_f.PD = 1;
	FM3_GPIO->PFR0_f.PE = 1;
	FM3_GPIO->EPFR08_f.SIN4S0 = 1;
	FM3_GPIO->EPFR08_f.SIN4S1 = 0;
	FM3_GPIO->EPFR08_f.SOT4B0 = 1;
	FM3_GPIO->EPFR08_f.SOT4B1 = 0;
	FM3_GPIO->EPFR08_f.CTS4S0 = 1;
	FM3_GPIO->EPFR08_f.CTS4S1 = 0;
	FM3_GPIO->EPFR08_f.RTS4E0 = 1;
	FM3_GPIO->EPFR08_f.RTS4E1 = 0;
#elif defined(RT_USING_UART4_1)
	/* Set UART Ch4 Port, SIN4_1(P1A), SOT4_1(P1B), CTS4_1(P1D), RTS4_1(P1E) */
	FM3_GPIO->PFR1_f.PA = 1;
	FM3_GPIO->PFR1_f.PB = 1;
	FM3_GPIO->PFR1_f.PD = 1;
	FM3_GPIO->PFR1_f.PE = 1;
	FM3_GPIO->EPFR08_f.SIN4S0 = 0;
	FM3_GPIO->EPFR08_f.SIN4S1 = 1;
	FM3_GPIO->EPFR08_f.SOT4B0 = 0;
	FM3_GPIO->EPFR08_f.SOT4B1 = 1;
	FM3_GPIO->EPFR08_f.CTS4S0 = 0;
	FM3_GPIO->EPFR08_f.CTS4S1 = 1;
	FM3_GPIO->EPFR08_f.RTS4E0 = 0;
	FM3_GPIO->EPFR08_f.RTS4E1 = 1;
#elif defined(RT_USING_UART4_2)
	/* Set UART Ch4 Port, SIN4_2(P05), SOT4_2(P06), CTS4_2(P08), RTS4_2(P09)*/
	FM3_GPIO->PFR0_f.P5 = 1;
	FM3_GPIO->PFR0_f.P6 = 1;
	FM3_GPIO->PFR0_f.P8 = 1;
	FM3_GPIO->PFR0_f.P9 = 1;
	FM3_GPIO->EPFR08_f.SIN4S0 = 1;
	FM3_GPIO->EPFR08_f.SIN4S1 = 1;
	FM3_GPIO->EPFR08_f.SOT4B0 = 1;
	FM3_GPIO->EPFR08_f.SOT4B1 = 1;
	FM3_GPIO->EPFR08_f.CTS4S0 = 1;
	FM3_GPIO->EPFR08_f.CTS4S1 = 1;
	FM3_GPIO->EPFR08_f.RTS4E0 = 1;
	FM3_GPIO->EPFR08_f.RTS4E1 = 1;
#endif

#if defined(RT_USING_UART5_0)
	/* Set UART Ch5 Port, SIN5_0(P60), SOT5_0(P61) */
	FM3_GPIO->PFR6_f.P0 = 1;
	FM3_GPIO->PFR6_f.P1 = 1;
	FM3_GPIO->EPFR08_f.SIN5S0 = 1;
	FM3_GPIO->EPFR08_f.SIN5S1 = 0;
	FM3_GPIO->EPFR08_f.SOT5B0 = 1;
	FM3_GPIO->EPFR08_f.SOT5B1 = 0;
#elif defined(RT_USING_UART5_1)
	/* Set UART Ch5 Port, SIN5_1(P63), SOT5_1(P64) */
	FM3_GPIO->PFR6_f.P3 = 1;
	FM3_GPIO->PFR6_f.P4 = 1;
	FM3_GPIO->EPFR08_f.SIN5S0 = 0;
	FM3_GPIO->EPFR08_f.SIN5S1 = 1;
	FM3_GPIO->EPFR08_f.SOT5B0 = 0;
	FM3_GPIO->EPFR08_f.SOT5B1 = 1;
#elif defined(RT_USING_UART5_2)
	/* Set UART Ch5 Port, SIN5_2(P36), SOT5_2(P37) */
	FM3_GPIO->PFR3_f.P6 = 1;
	FM3_GPIO->PFR3_f.P7 = 1;
	FM3_GPIO->EPFR08_f.SIN5S0 = 1;
	FM3_GPIO->EPFR08_f.SIN5S1 = 1;
	FM3_GPIO->EPFR08_f.SOT5B0 = 1;
	FM3_GPIO->EPFR08_f.SOT5B1 = 1;
#endif

#if defined(RT_USING_UART6_0)
	/* Set UART Ch6 Port, SIN6_0(P53), SOT6_0(P54) */
	FM3_GPIO->PFR5_f.P3 = 1;
	FM3_GPIO->PFR5_f.P4 = 1;
	FM3_GPIO->EPFR08_f.SIN6S0 = 1;
	FM3_GPIO->EPFR08_f.SIN6S1 = 0;
	FM3_GPIO->EPFR08_f.SOT6B0 = 1;
	FM3_GPIO->EPFR08_f.SOT6B1 = 0;
#elif defined(RT_USING_UART6_1)
	/* Set UART Ch6 Port, SIN6_1(P33), SOT6_1(P32) */
	FM3_GPIO->PFR3_f.P2 = 1;
	FM3_GPIO->PFR3_f.P3 = 1;
	FM3_GPIO->EPFR08_f.SIN6S0 = 0;
	FM3_GPIO->EPFR08_f.SIN6S1 = 1;
	FM3_GPIO->EPFR08_f.SOT6B0 = 0;
	FM3_GPIO->EPFR08_f.SOT6B1 = 1;
#endif

#if defined(RT_USING_UART7_0)
	/* Set UART Ch7 Port, SIN7_0(P59), SOT7_0(P5A) */
	FM3_GPIO->PFR5_f.P9 = 1;
	FM3_GPIO->PFR5_f.PA = 1;
	FM3_GPIO->EPFR08_f.SIN7S0 = 1;
	FM3_GPIO->EPFR08_f.SIN7S1 = 0;
	FM3_GPIO->EPFR08_f.SOT7B0 = 1;
	FM3_GPIO->EPFR08_f.SOT7B1 = 0;
#elif defined(RT_USING_UART7_1)
	/* Set UART Ch7 Port, SIN7_1(P4E), SOT7_1(P4D) */
	FM3_GPIO->PFR4_f.PD = 1;
	FM3_GPIO->PFR4_f.PE = 1;
	FM3_GPIO->EPFR08_f.SIN7S0 = 0;
	FM3_GPIO->EPFR08_f.SIN7S1 = 1;
	FM3_GPIO->EPFR08_f.SOT7B0 = 0;
	FM3_GPIO->EPFR08_f.SOT7B1 = 1;
#endif
}

static rt_err_t uart03_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
	struct uart03_device *uart;

	RT_ASSERT(serial != RT_NULL);

	uart = (struct uart03_device *)serial->parent.user_data;

	uart->uart_regs->SMR = SMR_MD_UART | SMR_SOE;

	/* set baudreate */
	uart->uart_regs->BGR = (40000000UL + (cfg->baud_rate/2))/cfg->baud_rate - 1;

	/* set stop bits */
	switch (cfg->stop_bits)
	{
	case STOP_BITS_1:
		uart->uart_regs->SMR_f.SBL = 0;
		uart->uart_regs->ESCR_f.ESBL = 0;
		break;
	case STOP_BITS_2:
		uart->uart_regs->SMR_f.SBL = 1;
		uart->uart_regs->ESCR_f.ESBL = 0;
		break;
	case STOP_BITS_3:
		uart->uart_regs->SMR_f.SBL = 0;
		uart->uart_regs->ESCR_f.ESBL = 1;
		break;
	case STOP_BITS_4:
		uart->uart_regs->SMR_f.SBL = 1;
		uart->uart_regs->ESCR_f.ESBL = 1;
		break;
	default:
		return RT_ERROR;
	}

	/* set data bits */
	switch (cfg->data_bits)
	{
	case DATA_BITS_5:
		uart->uart_regs->ESCR_f.L0 = 1;
		uart->uart_regs->ESCR_f.L1 = 0;
		uart->uart_regs->ESCR_f.L2 = 0;
		break;
	case DATA_BITS_6:
		uart->uart_regs->ESCR_f.L0 = 0;
		uart->uart_regs->ESCR_f.L1 = 1;
		uart->uart_regs->ESCR_f.L2 = 0;
		break;
	case DATA_BITS_7:
		uart->uart_regs->ESCR_f.L0 = 1;
		uart->uart_regs->ESCR_f.L1 = 1;
		uart->uart_regs->ESCR_f.L2 = 0;
		break;
	case DATA_BITS_8:
		uart->uart_regs->ESCR_f.L0 = 0;
		uart->uart_regs->ESCR_f.L1 = 0;
		uart->uart_regs->ESCR_f.L2 = 0;
		break;
	case DATA_BITS_9:
		uart->uart_regs->ESCR_f.L0 = 0;
		uart->uart_regs->ESCR_f.L1 = 0;
		uart->uart_regs->ESCR_f.L2 = 1;
		break;
	default:
		return RT_ERROR;
	}

	/* set parity */
	switch (cfg->parity)
	{
	case PARITY_NONE:
		uart->uart_regs->ESCR_f.PEN = 0;
		break;
	case PARITY_EVEN:
		uart->uart_regs->ESCR_f.PEN = 1;
		uart->uart_regs->ESCR_f.P   = 0;
		break;
	case PARITY_ODD:
		uart->uart_regs->ESCR_f.PEN = 1;
		uart->uart_regs->ESCR_f.P   = 1;
		break;
	default:
		return RT_ERROR;
	}

	/* set bit order */
	switch (cfg->bit_order)
	{
	case BIT_ORDER_LSB:
		uart->uart_regs->SMR_f.BDS = 0;
		break;
	case BIT_ORDER_MSB:
		uart->uart_regs->SMR_f.BDS = 1;
		break;
	default:
		return RT_ERROR;
	}

	/* set NRZ mode */
	switch (cfg->invert)
	{
	case NRZ_NORMAL:
		uart->uart_regs->ESCR_f.INV = 0;
		break;
	case NRZ_INVERTED:
		uart->uart_regs->ESCR_f.INV = 1;
		break;
	default:
		return RT_ERROR;
	}
	
	uart->uart_regs->SCR = SCR_RXE | SCR_TXE | SCR_RIE;

	return RT_EOK;
}
 
static rt_err_t uart03_control(struct rt_serial_device *serial, int cmd, void *arg)
{
	struct uart03_device *uart;
        
	RT_ASSERT(serial != RT_NULL);	
	uart = (struct uart03_device *)serial->parent.user_data;
	
	switch (cmd)
	{
	case RT_DEVICE_CTRL_CLR_INT:
		/* disable rx irq */
		UART_DISABLE_IRQ(uart->rx_irq);
		break;
	case RT_DEVICE_CTRL_SET_INT:
		/* enable rx irq */
		UART_ENABLE_IRQ(uart->rx_irq);
		break;
	}

	return (RT_EOK);	
}
    
static int uart03_putc(struct rt_serial_device *serial, char c)
{
	struct uart03_device *uart;

	RT_ASSERT(serial != RT_NULL);	
	
	uart = (struct uart03_device *)serial->parent.user_data;
	/* while send buffer is empty */
	while (!(uart->uart_regs->SSR & SSR_TDRE));
	/* write to send buffer */
	uart->uart_regs->TDR = c;

	return (1);	
}

static int uart03_getc(struct rt_serial_device *serial)
{	
	struct uart03_device *uart;
	int ch;
	
	RT_ASSERT(serial != RT_NULL);	
	
	uart = (struct uart03_device *)serial->parent.user_data;
	/* receive buffer is full */
	if (uart->uart_regs->SSR & SSR_RDRF)
	{
		ch = uart->uart_regs->RDR & 0xff;
		return (ch);
	}
	else
		return (-1);	
}

static struct rt_uart_ops uart03_ops =
{
	uart03_configure,
	uart03_control,
	uart03_putc,
	uart03_getc,
};

static rt_err_t uart47_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
	struct uart47_device *uart;

	RT_ASSERT(serial != RT_NULL);

	uart = (struct uart47_device *)serial->parent.user_data;

	uart->uart_regs->SMR = SMR_MD_UART | SMR_SOE;

	/* set baudreate */
	uart->uart_regs->BGR = (40000000UL + (cfg->baud_rate/2))/cfg->baud_rate - 1;

	/* set stop bits */
	switch (cfg->stop_bits)
	{
	case STOP_BITS_1:
		uart->uart_regs->SMR_f.SBL = 0;
		uart->uart_regs->ESCR_f.ESBL = 0;
		break;
	case STOP_BITS_2:
		uart->uart_regs->SMR_f.SBL = 1;
		uart->uart_regs->ESCR_f.ESBL = 0;
		break;
	case STOP_BITS_3:
		uart->uart_regs->SMR_f.SBL = 0;
		uart->uart_regs->ESCR_f.ESBL = 1;
		break;
	case STOP_BITS_4:
		uart->uart_regs->SMR_f.SBL = 1;
		uart->uart_regs->ESCR_f.ESBL = 1;
		break;
	default:
		return RT_ERROR;
	}

	/* set data bits */
	switch (cfg->data_bits)
	{
	case DATA_BITS_5:
		uart->uart_regs->ESCR_f.L0 = 1;
		uart->uart_regs->ESCR_f.L1 = 0;
		uart->uart_regs->ESCR_f.L2 = 0;
		break;
	case DATA_BITS_6:
		uart->uart_regs->ESCR_f.L0 = 0;
		uart->uart_regs->ESCR_f.L1 = 1;
		uart->uart_regs->ESCR_f.L2 = 0;
		break;
	case DATA_BITS_7:
		uart->uart_regs->ESCR_f.L0 = 1;
		uart->uart_regs->ESCR_f.L1 = 1;
		uart->uart_regs->ESCR_f.L2 = 0;
		break;
	case DATA_BITS_8:
		uart->uart_regs->ESCR_f.L0 = 0;
		uart->uart_regs->ESCR_f.L1 = 0;
		uart->uart_regs->ESCR_f.L2 = 0;
		break;
	case DATA_BITS_9:
		uart->uart_regs->ESCR_f.L0 = 0;
		uart->uart_regs->ESCR_f.L1 = 0;
		uart->uart_regs->ESCR_f.L2 = 1;
		break;
	default:
		return RT_ERROR;
	}

	/* set parity */
	switch (cfg->parity)
	{
	case PARITY_NONE:
		uart->uart_regs->ESCR_f.PEN = 0;
		break;
	case PARITY_EVEN:
		uart->uart_regs->ESCR_f.PEN = 1;
		uart->uart_regs->ESCR_f.P   = 0;
		break;
	case PARITY_ODD:
		uart->uart_regs->ESCR_f.PEN = 1;
		uart->uart_regs->ESCR_f.P   = 1;
		break;
	default:
		return RT_ERROR;
	}

	/* set bit order */
	switch (cfg->bit_order)
	{
	case BIT_ORDER_LSB:
		uart->uart_regs->SMR_f.BDS = 0;
		break;
	case BIT_ORDER_MSB:
		uart->uart_regs->SMR_f.BDS = 1;
		break;
	default:
		return RT_ERROR;
	}

	/* set NRZ mode */
	switch (cfg->invert)
	{
	case NRZ_NORMAL:
		uart->uart_regs->ESCR_f.INV = 0;
		break;
	case NRZ_INVERTED:
		uart->uart_regs->ESCR_f.INV = 1;
		break;
	default:
		return RT_ERROR;
	}
	
	/* configure fifo */
	/* Disable the Data Lost detection */
	uart->uart_regs->FCR1_f.FLSTE = 0;
	/* Enable the received FIFO idle detection */
	uart->uart_regs->FCR1_f.FRIE  = 1;
	/* Requests for the transmit FIFO data */
	uart->uart_regs->FCR1_f.FDRQ  = 1;
	/* Disable the transmit FIFO interrupt */
	uart->uart_regs->FCR1_f.FTIE  = 0;
	/* Transmit FIFO:FIFO1; Received FIFO:FIFO2 */
	uart->uart_regs->FCR1_f.FSEL  = 0;

	/* Transfer data count */
	uart->uart_regs->FBYTE1 = 0;
	/* Set the data count to generate a received interrupt */
	uart->uart_regs->FBYTE2 = uart->fifo_size;

	/* FIFO pointer Not reloaded */
	uart->uart_regs->FCR0_f.FLD  = 0;
	/* FIFO pointer Not saved */
	uart->uart_regs->FCR0_f.FSET = 0;
	/* FIFO2 is reset */
	uart->uart_regs->FCR0_f.FCL2 = 1;
	/* FIFO1 is reset */
	uart->uart_regs->FCR0_f.FCL1 = 1;
	/* Enables the FIFO2 operation */
	uart->uart_regs->FCR0_f.FE2  = 1;
	/* Enables the FIFO1 operation */
	uart->uart_regs->FCR0_f.FE1  = 1;
	
    /* enable receive and send */	
	uart->uart_regs->SCR = SCR_RXE | SCR_TXE | SCR_RIE;

	return RT_EOK;
}

static rt_err_t uart47_control(struct rt_serial_device *serial, int cmd, void *arg)
{
	struct uart47_device *uart;

	RT_ASSERT(serial != RT_NULL);	
	uart = (struct uart47_device *)serial->parent.user_data;
	
	switch (cmd)
	{
	case RT_DEVICE_CTRL_CLR_INT:
		/* disable rx irq */
		UART_DISABLE_IRQ(uart->rx_irq);
		break;
	case RT_DEVICE_CTRL_SET_INT:
		/* enable rx irq */
		UART_ENABLE_IRQ(uart->rx_irq);
		break;
	}

	return (RT_EOK);	
}

static int uart47_putc(struct rt_serial_device *serial, char c)
{
	struct uart47_device *uart;

	RT_ASSERT(serial != RT_NULL);
	
	uart = (struct uart47_device *)serial->parent.user_data;

	/* while send fifo is empty */
	while (!(uart->uart_regs->SSR & SSR_TDRE));
	/* write to fifo */
	uart->uart_regs->TDR = c;

	return (1);	
}

static int uart47_getc(struct rt_serial_device *serial)
{	
	int ch;
	struct uart47_device *uart;

	RT_ASSERT(serial != RT_NULL);
	
	uart = (struct uart47_device *)serial->parent.user_data;
    
	/* receive is disabled */
	if (!(uart->uart_regs->SCR & SCR_RXE))
		return (-1);
    /* receive fifo is not full */
	if ((uart->uart_regs->SSR & SSR_RDRF) == 0)
		return (-1);
	/* read char */
	ch = uart->uart_regs->RDR & 0xff;
 	 
	return (ch);	
}

static struct rt_uart_ops uart47_ops =
{
	uart47_configure,
	uart47_control,
	uart47_putc,
	uart47_getc,
};

void rt_hw_serial_init(void)
{
	struct serial_configure config;

	uart_pin_setup();

#if (defined(RT_USING_UART0_0) || defined(RT_USING_UART0_1))
	config.baud_rate = BAUD_RATE_115200;
	config.bit_order = BIT_ORDER_LSB;
	config.data_bits = DATA_BITS_8;
	config.parity    = PARITY_NONE;
	config.stop_bits = STOP_BITS_1;
	config.invert    = NRZ_NORMAL;

	serial0.ops    = &uart03_ops;
	serial0.int_rx = &uart0_int_rx;
	serial0.config = config;

	/* register UART0 device */
	rt_hw_serial_register(&serial0, "uart0",
		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
		&uart0);
#endif

#if (defined(RT_USING_UART1_0) || defined(RT_USING_UART1_1))
	config.baud_rate = BAUD_RATE_115200;
	config.bit_order = BIT_ORDER_LSB;
	config.data_bits = DATA_BITS_8;
	config.parity    = PARITY_NONE;
	config.stop_bits = STOP_BITS_1;
	config.invert    = NRZ_NORMAL;

	serial1.ops    = &uart03_ops;
	serial1.int_rx = &uart1_int_rx;
	serial1.config = config;

	/* register UART1 device */
	rt_hw_serial_register(&serial1,
		"uart1",
		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
		&uart1);
#endif

#if (defined(RT_USING_UART2_0) || defined(RT_USING_UART2_1) || defined(RT_USING_UART2_2))
	config.baud_rate = BAUD_RATE_115200;
	config.bit_order = BIT_ORDER_LSB;
	config.data_bits = DATA_BITS_8;
	config.parity    = PARITY_NONE;
	config.stop_bits = STOP_BITS_1;
	config.invert    = NRZ_NORMAL;

	serial2.ops    = &uart03_ops;
	serial2.int_rx = &uart2_int_rx;
	serial2.config = config;

	/* register UART2 device */
	rt_hw_serial_register(&serial2,
		"uart2",
		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
		&uart2);
#endif

#if (defined(RT_USING_UART3_0) || defined(RT_USING_UART3_1) || defined(RT_USING_UART3_2))
	config.baud_rate = BAUD_RATE_115200;
	config.bit_order = BIT_ORDER_LSB;
	config.data_bits = DATA_BITS_8;
	config.parity    = PARITY_NONE;
	config.stop_bits = STOP_BITS_1;
	config.invert    = NRZ_NORMAL;

	serial3.ops    = &uart03_ops;
	serial3.int_rx = &uart3_int_rx;
	serial3.config = config;

	/* register UART3 device */
	rt_hw_serial_register(&serial3,
		"uart3",
		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
		&uart3);
#endif

#if (defined(RT_USING_UART4_0) || defined(RT_USING_UART4_1) || defined(RT_USING_UART4_2))
	config.baud_rate = BAUD_RATE_115200;
	config.bit_order = BIT_ORDER_LSB;
	config.data_bits = DATA_BITS_8;
	config.parity    = PARITY_NONE;
	config.stop_bits = STOP_BITS_1;
	config.invert    = NRZ_NORMAL;

	serial4.ops    = &uart47_ops;
	serial4.int_rx = &uart4_int_rx;
	serial4.config = config;

	/* register UART4 device */
	rt_hw_serial_register(&serial4,
		"uart4",
		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
		&uart4);
#endif

#if (defined(RT_USING_UART5_0) || defined(RT_USING_UART5_1) || defined(RT_USING_UART5_2))
	config.baud_rate = BAUD_RATE_115200;
	config.bit_order = BIT_ORDER_LSB;
	config.data_bits = DATA_BITS_8;
	config.parity    = PARITY_NONE;
	config.stop_bits = STOP_BITS_1;
	config.invert    = NRZ_NORMAL;

	serial5.ops    = &uart47_ops;
	serial5.int_rx = &uart5_int_rx;
	serial5.config = config;

	/* register UART5 device */
	rt_hw_serial_register(&serial5,
		"uart5",
		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
		&uart5);
#endif

#if (defined(RT_USING_UART6_0) || defined(RT_USING_UART6_1))
	config.baud_rate = BAUD_RATE_115200;
	config.bit_order = BIT_ORDER_LSB;
	config.data_bits = DATA_BITS_8;
	config.parity    = PARITY_NONE;
	config.stop_bits = STOP_BITS_1;
	config.invert    = NRZ_NORMAL;

	serial6.ops    = &uart47_ops;
	serial6.int_rx = &uart6_int_rx;
	serial6.config = config;

	/* register UART6 device */
	rt_hw_serial_register(&serial6,
		"uart6",
		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
		&uart6);
#endif

#if (defined(RT_USING_UART7_0) || defined(RT_USING_UART7_1))
	config.baud_rate = BAUD_RATE_115200;
	config.bit_order = BIT_ORDER_LSB;
	config.data_bits = DATA_BITS_8;
	config.parity    = PARITY_NONE;
	config.stop_bits = STOP_BITS_1;
	config.invert    = NRZ_NORMAL;

	serial7.ops    = &uart47_ops;
	serial7.int_rx = &uart7_int_rx;
	serial7.config = config;

	/* register UART7 device */
	rt_hw_serial_register(&serial7,
		"uart7",
		RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
		&uart7);
#endif
}