uart.c

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/****************************************************************************
 *
 * MODULE:             uart.c
 *
 * COMPONENT:          $RCSfile: uart.c,v $
 *
 * VERSION:            $Name: JN-AN-1015-1v2 $
 *
 * REVISION:           $Revision: 1.2 $
 *
 * DATED:              $Date: 2006/09/05 09:01:19 $
 *
 * STATUS:             $State: Exp $
 *
 * AUTHOR:             Ian Morris
 *
 * DESCRIPTION
 *
 * CHANGE HISTORY:
 *
 * $Log: uart.c,v $
 * Revision 1.2  2006/09/05 09:01:19  imorr
 * Updated copyright information
 *
 * Revision 1.1  2006/09/05 06:48:38  imorr
 * Initial version
 *
 *
 *
 * LAST MODIFIED BY:   $Author: imorr $
 *                     $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. All rights reserved
 *
 ****************************************************************************/

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

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

/****************************************************************************/
/***        Macro Definitions                                             ***/
/****************************************************************************/

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

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

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

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

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

/****************************************************************************/
/***        Local Functions                                               ***/
/****************************************************************************/
PRIVATE void vUART_HandleUart0Interrupt(uint32 u32Device, uint32 u32ItemBitmap);

/****************************************************************************
 *
 * NAME: vUART_Init
 *
 * DESCRIPTION:
 *
 * PARAMETERS:      Name            RW  Usage
 * None.
 *
 * RETURNS:
 * None.
 *
 * NOTES:
 * None.
 ****************************************************************************/
PUBLIC void vUART_Init(void)
{
    /* Enable UART 0: 38400-8-N-1 */
    vAHI_UartEnable(E_AHI_UART_0);

    vAHI_UartReset(E_AHI_UART_0, TRUE, TRUE);
    vAHI_UartReset(E_AHI_UART_0, FALSE, FALSE);

    /* Register function that will handle UART interrupts */
    vAHI_Uart0RegisterCallback(vUART_HandleUart0Interrupt);

    vAHI_UartSetClockDivisor(E_AHI_UART_0, E_AHI_UART_RATE_115200);
    vAHI_UartSetControl(E_AHI_UART_0, FALSE, FALSE, E_AHI_UART_WORD_LEN_8, TRUE, FALSE);
    vAHI_UartSetInterrupt(E_AHI_UART_0, FALSE, FALSE, TRUE, TRUE, E_AHI_UART_FIFO_LEVEL_1);
}

/****************************************************************************
 *
 * 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(E_AHI_UART_0) & E_AHI_UART_LS_THRE)
    {
        if(!bSerialQ_Empty(TX_QUEUE))
        {
            vAHI_UartWriteData(E_AHI_UART_0, 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(E_AHI_UART_0, 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);
}

/****************************************************************************
 *
 * NAME: vUART_HandleUart0Interrupt
 *
 * DESCRIPTION:
 *
 * PARAMETERS:      Name            RW  Usage
 * None.
 *
 * RETURNS:
 * None.
 *
 * NOTES:
 * None.
 ****************************************************************************/
PRIVATE void vUART_HandleUart0Interrupt(uint32 u32Device, uint32 u32ItemBitmap)
{
    if (u32Device == E_AHI_DEVICE_UART0)
    {
        /* If character transmission is complete */
        if (u32ItemBitmap == E_AHI_UART_INT_TX)
        {
            vUART_TxCharISR();
        }
        /* If data has been received */
        else if ((u32ItemBitmap & 0x000000FF) == E_AHI_UART_INT_RXDATA)
        {
            /* Process UART0 RX interrupt */
            vUART_RxCharISR(u8AHI_UartReadData(E_AHI_UART_0));
        }
    }
}

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