/****************************************************************************
 *
 * MODULE:             uart.c
 *
 * COMPONENT:          $RCSfile: uart.c,v $
 *
 * VERSION:            $Name:  $
 *
 * REVISION:           $Revision: 1.1 $
 *
 * DATED:              $Date: 2008/01/30 09:52:07 $
 *
 * STATUS:             $State: Exp $
 *
 * AUTHOR:             Ian Morris
 *
 * DESCRIPTION
 *
 * CHANGE HISTORY:
 *
 * $Log: uart.c,v $ * Revision 1.1  2008/01/30 09:52:07  lmitch * Updated to work with new SDK * * Revision 1.1  2006/07/24 14:40:11  rmm * First Release 1v0 (Based on Application Note JN-AN-1005-Wireless-UART Version 1.5). *
 *
 *
 * LAST MODIFIED BY:   $Author: lmitch $
 *                     $Modtime: $
 *
 *
 ****************************************************************************
 * * This software is owned by Jennic and/or its supplier and is protected * under applicable copyright laws. All rights are reserved. We grant You, * and any third parties, a license to use this software solely and * exclusively on Jennic products. You, and any third parties must reproduce * the copyright and warranty notice and any other legend of ownership on each * copy or partial copy of the software. * * THIS SOFTWARE IS PROVIDED "AS IS". JENNIC MAKES NO WARRANTIES, WHETHER * EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, * ACCURACY OR LACK OF NEGLIGENCE. JENNIC SHALL NOT, IN ANY CIRCUMSTANCES, * BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, SPECIAL, * INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR ANY REASON WHATSOEVER. * * Copyright Jennic Ltd 2005, 2006, 2007. All rights reserved * ****************************************************************************/
/****************************************************************************/
/***        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: 1200-8-N-1 */
    vAHI_UartEnable(UART);

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

    /* Set the clock divisor register to give 1200 buad, this has to be done
       directly as the normal routines (in ROM) do not support 1200 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                                                   ***/
/****************************************************************************/