/****************************************************************************
 *
 * MODULE:             uart.c
 *
 * COMPONENT:          $RCSfile: $
 *
 * VERSION:            $Name: $
 *
 * REVISION:           $Revision: $
 *
 * DATED:              $Date: $
 *
 * STATUS:             $State: $
 *
 * AUTHOR:             Ian Morris
 *
 * DESCRIPTION
 *
 * CHANGE HISTORY:
 *
 * $Log: $
 *
 *
 * LAST MODIFIED BY:   $Author: $
 *                     $Modtime: $
 *
 *
 ****************************************************************************
 *
 *  (c) Copyright 2000 JENNIC Ltd
 *
 ****************************************************************************/

/****************************************************************************/
/***        Include files                                                 ***/
/****************************************************************************/
#include <jendefs.h>
#include <AppHardwareApi.h>

#include "config.h"
#include "serialq.h"
#include "uart.h"

/****************************************************************************/
/***        Macro Definitions                                             ***/
/****************************************************************************/
#define UART_START_ADR  	0x30000000UL
#define UART_LCR_OFFSET 	0x0C
#define UART_DLM_OFFSET 	0x04

/****************************************************************************/
/***        Type Definitions                                              ***/
/****************************************************************************/

/****************************************************************************/
/***        Local Function Prototypes                                     ***/
/****************************************************************************/

/****************************************************************************/
/***        Exported Variables                                            ***/
/****************************************************************************/

/****************************************************************************/
/***        Local Variables                                               ***/
/****************************************************************************/

/****************************************************************************/
/***        Exported Functions                                            ***/
/****************************************************************************/

/****************************************************************************/
/***        Local Functions                                               ***/
/****************************************************************************/
PRIVATE void vUART_SetBuadRate(uint32 u32BaudRate);

/****************************************************************************
 *
 * NAME: vUART_Init
 *
 * DESCRIPTION:
 *
 * PARAMETERS:      Name            RW  Usage
 * None.
 *
 * RETURNS:
 * None.
 *
 * NOTES:
 * None.
 ****************************************************************************/
PUBLIC void vUART_Init(void)
{
    /* Enable UART 0: 19200-8-N-1 */
    vAHI_UartEnable(UART);

    vAHI_UartReset(UART, TRUE, TRUE);
    vAHI_UartReset(UART, FALSE, FALSE);

    /* Set the clock divisor register to give 19200 buad, this has to be done
       directly as the normal routines (in ROM) do not support 19200 baud */
    vUART_SetBuadRate(UART_BAUD_RATE);

    vAHI_UartSetControl(UART, FALSE, FALSE, E_AHI_UART_WORD_LEN_8, TRUE, FALSE);
    vAHI_UartSetInterrupt(UART, FALSE, FALSE, TRUE, TRUE, E_AHI_UART_FIFO_LEVEL_1);
}

/****************************************************************************
 *
 * NAME: vUART_SetBuadRate
 *
 * DESCRIPTION:
 *
 * PARAMETERS: Name        RW  Usage
 *
 * RETURNS:
 *
 ****************************************************************************/
PRIVATE void vUART_SetBuadRate(uint32 u32BaudRate)
{
    uint8 *pu8Reg;
    uint8  u8TempLcr;
    uint16 u16Divisor;
    

  
    /* Put UART into clock divisor setting mode */
    pu8Reg    = (uint8 *)(UART_START_ADR + UART_LCR_OFFSET);
    u8TempLcr = *pu8Reg;
    *pu8Reg   = u8TempLcr | 0x80;

    /* Write to divisor registers:
       Divisor register = 16MHz / (16 x baud rate) */
    u16Divisor = (uint16)(16000000UL / (16UL * u32BaudRate));

    pu8Reg  = (uint8 *)UART_START_ADR;
    *pu8Reg = (uint8)(u16Divisor & 0xFF);
    pu8Reg  = (uint8 *)(UART_START_ADR + UART_DLM_OFFSET);
    *pu8Reg = (uint8)(u16Divisor >> 8);

    /* Put back into normal mode */
    pu8Reg    = (uint8 *)(UART_START_ADR + UART_LCR_OFFSET);
    u8TempLcr = *pu8Reg;
    *pu8Reg   = u8TempLcr & 0x7F;
}

/****************************************************************************
 *
 * NAME: vUART_StartTx
 *
 * DESCRIPTION:
 *
 * PARAMETERS:      Name            RW  Usage
 * None.
 *
 * RETURNS:
 * None.
 *
 * NOTES:
 * None.
 ****************************************************************************/
PUBLIC void vUART_StartTx(void)
{

    /* Has interrupt driven transmit stalled (tx fifo is empty) */
    if (u8AHI_UartReadLineStatus(UART) & E_AHI_UART_LS_THRE)
    {
        if(!bSerialQ_Empty(TX_QUEUE))
        {
		   	{
		   
		   vAHI_UartWriteData(UART, u8SerialQ_RemoveItem(TX_QUEUE));
		   
		  
		   	}
        }
    }
}

/****************************************************************************
 *
 * NAME: vUART_TxCharISR
 *
 * DESCRIPTION:
 *
 * PARAMETERS:      Name            RW  Usage
 * None.
 *
 * RETURNS:
 * None.
 *
 * NOTES:
 * None.
 ****************************************************************************/
PUBLIC void vUART_TxCharISR(void)
{
    if(!bSerialQ_Empty(TX_QUEUE))
	{
        vAHI_UartWriteData(UART, u8SerialQ_RemoveItem(TX_QUEUE));
	}
}

/****************************************************************************
 *
 * NAME: vUART_RxCharISR
 *
 * DESCRIPTION:
 *
 * PARAMETERS:      Name            RW  Usage
 * None.
 *
 * RETURNS:
 * None.
 *
 * NOTES:
 * None.
 ****************************************************************************/
PUBLIC void vUART_RxCharISR(uint8 u8RxChar)
{
    vSerialQ_AddItem(RX_QUEUE, u8RxChar);
}

/****************************************************************************/
/***        END OF FILE                                                   ***/
/****************************************************************************/