os_viewc.c

基于 Philips 公司的 ARM-7 使用之 uC/OS-II 作业系统,此例程是移植于 LPC-2888 上的应用,不同于一般的 Porting 其最主要是加入了支援 OS_View 观察器功能

/*
*********************************************************************************************************
*                                               uC/OS-View
*
*                                 (c) Copyright 2005, Micrium, Weston, FL
*                                           All Rights Reserved
*
*                                            NXP LPC2888 (ARM7)
*                                             IAR C Compiler
*
*
* Filename   : os_viewc.c
* Version    : V1.20
* Programmer : Jean J. Labrosse
*********************************************************************************************************
*/

#include <includes.h>

/*
*********************************************************************************************************
*                                              CONSTANTS
*********************************************************************************************************
*/

#define  BIT0      0x01
#define  BIT1      0x02
#define  BIT2      0x04
#define  BIT3      0x08
#define  BIT4      0x10
#define  BIT5      0x20
#define  BIT6      0x40
#define  BIT7      0x80

/*$PAGE*/
/*
*********************************************************************************************************
*                                           EXIT uC/OS-View
*
* Description: This function is called if your target needs to 'uninstall' uC/OS-View.
*
* Note(s)    :
*********************************************************************************************************
*/

void  OSView_Exit (void)
{
}

/*
*********************************************************************************************************
*                                           Obtain CPU name
*********************************************************************************************************
*/

void  OSView_GetCPUName (INT8U *s)
{
    INT8U  cpu_clk_freq;


    cpu_clk_freq = (INT8U)(BSP_CPU_ClkFreq() / 1000);
    (void)OS_StrCopy(s, "NXP LPC2888 (xx MHz)");
    s[13] = cpu_clk_freq / 10 + '0';
    s[14] = cpu_clk_freq % 10 + '0';
}

/*
*********************************************************************************************************
*                                  Obtain Interrupt Stack information
*********************************************************************************************************
*/

INT32U  OSView_GetIntStkBase (void)
{
    return (0);                                         /* We are not using an ISR stack               */
}


INT32U  OSView_GetIntStkSize (void)
{
    return (0);                                         /* We are not using an ISR stack               */
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                    INITIALISE uC/OS-View COM PORT
*
* Description: Initialize the hardware required for the OS to run. This will work on any target hardware,
*              but may have to be tailored a little (regarding the clock frequency). Of course the same
*              holds true if for some reason you choose to use another timer.
*
* Note(s)    : 1) This function assumes that a free running timer has been initialized.  The timer can
*                 either be a 16 bits or 32 bits timer.  Your application needs to provide a function
*                 called OSView_TmrRd() that reads the current counts of this timer.  The free running
*                 timer is initialized by the BSP function OSView_TmrInit().
*********************************************************************************************************
*/

void  OSView_InitTarget (INT32U baud_rate)
{
    INT16U     div;                                     /* Baud rate divisor                           */
    INT8U      divlo;
    INT8U      divhi;
    INT8U      lcr;										/* Line Control Register                       */
    INT32U     clk_freq;
#if OS_CRITICAL_METHOD == 3                             /* Allocate storage for CPU status register    */
    OS_CPU_SR  cpu_sr   = 0;
#endif


    OSView_TmrInit();                                   /* Initialize the free running timer           */

                                                        /* Compute divisor for desired baud rate       */
    clk_freq = BSP_CPU_ClkFreq() * 1000;                /* Convert KHz to Hz                           */
    div      = (INT16U)(clk_freq/(16 * baud_rate));
    divlo    =  div & 0x00FF;                           /* Split divisor into LOW and HIGH bytes       */
    divhi    = (div >> 8) & 0x00FF;
    lcr      = 0x03;                                    /* 8 Bits, 1 Stop, No Parity                   */

    OS_ENTER_CRITICAL();
    LCR      = BIT7;                                    /* Set divisor access bit                      */
    DLL      = divlo;                                   /* Load divisor                                */
    DLM      = divhi;
    LCR      = lcr;                                     /* Set line control register                   */
    IER      = 0x00;                                    /* Disable both Rx and Tx interrupts           */
    FCR      = 0x05;                                    /* Enable FIFO, flush Rx & Tx     **           */
    OS_EXIT_CRITICAL();
                                                        /* VIC UART #0 Initialization                  */
    OSView_IntInit();                                   /* Store handler location in VIC table         */
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                       Disable Rx Interrupts
*********************************************************************************************************
*/

void  OSView_RxIntDis (void)
{
    IER = 0;
}

/*
*********************************************************************************************************
*                                       Enable Rx Interrupts
*********************************************************************************************************
*/

void  OSView_RxIntEn (void)
{
    IER = BIT0;
}

/*
*********************************************************************************************************
*                                 Rx Communication handler for uC/OS-View
*
* Description: This function is called by OSView_RxISR (see OS_VIEWa.ASM) to process a received
*              character interrupt.
*
* Note(s)    : This adaptation of uC/OS-View assumes that a 'combined' interrupt is generated by the UART
*              and thus this function is not needed.
*********************************************************************************************************
*/

void  OSView_RxISRHandler (void)
{
}

/*
*********************************************************************************************************
*                                Rx/Tx Communication handler for uC/OS-View
*
* Description: This function is NOT called because the M16C has a separate Rx and Tx ISR.
*********************************************************************************************************
*/

void  OSView_RxTxISRHandler (void)
{
    volatile  INT8U  rx_data;
    volatile  INT8U  lsr;
    volatile  INT8U  iir;


    iir = IIR & 0x0F;
    while (iir != 1) {
        switch (iir) {
            case  0:                                   /* Modem interrupt?                             */
                 break;

            case  2:                                   /* Transmitted character?                       */
                 OSView_TxHandler();
                 break;

            case  4:                                   /* Received a character?                        */
                 lsr     = LSR;
                 rx_data = RBR;
                 OSView_RxHandler(rx_data);            /* Call the generic Rx handler                  */
                 break;

            case  6:                                   /* Receive Line Status interrupt?               */
                 break;

            case 12:                                   /* CTI interrupt?                               */
                 break;
        }
        iir = IIR & 0x0F;
    }
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                      Communication for uC/OS-View
*
* Description: Send 1 character to COM Port
*********************************************************************************************************
*/

void  OSView_Tx1 (INT8U c)
{
    THR = c;
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                       Disable Tx Interrupts
*********************************************************************************************************
*/

void  OSView_TxIntDis (void)
{
    IER = BIT0;                                         /* Just enable the receive interrupts          */
}

/*
*********************************************************************************************************
*                                       Enable Tx Interrupts
*********************************************************************************************************
*/

void  OSView_TxIntEn (void)
{
    IER = BIT1 | BIT0;
}

/*
*********************************************************************************************************
*                                 Tx Communication handler for uC/OS-View
*                                            (PORT SPECIFIC)
*
* Description: Handle transmission of a character
*
* Note(s)    : 1) This function is called by OSView_RxISR (see OS_VIEWa.ASM)
*              2) This adaptation of uC/OS-View assumes that a 'combined' interrupt is generated by the
*                 UART and thus this function is not needed.
*********************************************************************************************************
*/

void  OSView_TxISRHandler (void)
{
}