platform.c

VIA VT6524 8口网管交换机源码

/*
 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
 * All rights reserved.
 *
 * This software is copyrighted by and is the sole property of
 * VIA Networking Technologies, Inc. This software may only be used
 * in accordance with the corresponding license agreement. Any unauthorized
 * use, duplication, transmission, distribution, or disclosure of this
 * software is expressly forbidden.
 *
 * This software is provided by VIA Networking Technologies, Inc. "as is"
 * and any express or implied warranties, including, but not limited to, the
 * implied warranties of merchantability and fitness for a particular purpose
 * are disclaimed. In no event shall VIA Networking Technologies, Inc.
 * be liable for any direct, indirect, incidental, special, exemplary, or
 * consequential damages.
 *
 *
 * File:    platform.c
 *
 * Purpose: Functions of platform to support tasks/timers/ISRs
 *
 * Author:  Tevin Chen
 *
 * Date:    Jan 08, 2002
 *
 * Functions:
 *
 * Revision History:
 *
 */


#if !defined(__TTYIO_H__)
#include "ttyio.h"
#endif
#if !defined(__PLATFORM_H__)
#include "platform.h"
#endif




/*---------------------  Static Definitions  ------------------------*/
#define UART_RING_LEN   4

/*---------------------  Static Types  ------------------------------*/

/*---------------------  Static Macros  -----------------------------*/

/*---------------------  Static Classes  ----------------------------*/

/*---------------------  Static Variables  --------------------------*/
static DIRECT_MEMTYPE_DATA BYTE s_abyUartRxRing[UART_RING_LEN];
static DIRECT_MEMTYPE_DATA BYTE s_byRingInPtr = 0;
static DIRECT_MEMTYPE_DATA BYTE s_byRingOutPtr = 0;

/*---------------------  Static Functions  --------------------------*/
void s_vCpuIdleTask(void) DIRECT_FUNTYPE_REENT;

/*---------------------  Export Variables  --------------------------*/
bit     g_fCpuIntShadow = 0;

#ifdef __MODULE_WEB_SMART
DIRECT_MEMTYPE_DATA UINT16  g_wWebAutoLogoutTime = 0;
DIRECT_MEMTYPE_DATA UINT16  g_wWebAutoLogoutCntr = 0;
#endif
DIRECT_MEMTYPE_DATA UINT16  g_wAutoLogoutTime = 0;
DIRECT_MEMTYPE_DATA UINT16  g_wAutoLogoutCntr = 0;
DIRECT_MEMTYPE_DATA BYTE    g_byTimer = 0;

#ifdef __MODULE_WEB_SMART
PFN_CALLBACK g_pfnIdleTaskFunc[3] = { NULL, NULL, NULL };
#else
PFN_CALLBACK g_pfnIdleTaskFunc[1] = { NULL };
#endif




//
// Interrupt Service Routines: Timer 0
//
void PLATvIsrTimer0 (void) interrupt 1
{
    PLATvTimer0Init();
    g_byTimer++;

    // if auto-logout is enabled
    if (g_wAutoLogoutTime != 0)
        g_wAutoLogoutCntr++;
        
#ifdef __MODULE_WEB_SMART
    if (g_wWebAutoLogoutTime != 0)
        g_wWebAutoLogoutCntr++;
#endif
}


//
// Interrupt Service Routines: UART
//
void PLATvIsrUart (void) interrupt 4
{
    if (RI == 1) {
        // skip cKey==0 for hyper terminal of windows XP
        // if UART-rx-buffer is not full and there is an input key
        if ( (((s_byRingInPtr + 1) % UART_RING_LEN) != s_byRingOutPtr) && (SBUF != 0) ) {
            // increase s_byRingInPtr with wrap around
            s_byRingInPtr = (s_byRingInPtr + 1) % UART_RING_LEN;
            s_abyUartRxRing[s_byRingInPtr] = SBUF;

            // if got input key, reset timer0 counter
            g_wAutoLogoutCntr = 0;
            g_byTimer = 0;
        }
        RI = 0;
    }
}


// When CPU is idle, will call this function
//
void s_vCpuIdleTask (void) DIRECT_FUNTYPE_REENT
{
    // Call IdleTask function 0
    (*(g_pfnIdleTaskFunc[0]))();

#ifdef __MODULE_WEB_SMART
    // Call IdleTask function 1
    (*(g_pfnIdleTaskFunc[1]))();
#endif
}


void PLATvUartInit (void) DIRECT_FUNTYPE_REENT
{
    SCON  = 0x50;                       // SCON: mode 1, 8-bit UART; enable rcvr
    PCON &= 0x7f;                       // disable double baud rate
    TMOD  = 0x21;                       // TMOD: timer 0: mode 1, 16-bit timer;
                                        //       timer 1: mode 2, 8-bit reload timer
    TH1   = 249;                        // TH1:  reload value for 9600 baud @ 25MHz
    TR1   = 1;                          // TR1:  timer 1 run  for UART
}


BYTE PLATbyUartGetKeyMultiTask (void) DIRECT_FUNTYPE_REENT
{
    // UART Ring buf is empty
    while (s_byRingInPtr == s_byRingOutPtr) {
        // Polling for auto logout
        if (g_wAutoLogoutCntr > g_wAutoLogoutTime) {
            g_wAutoLogoutCntr = 0;
            return KEY_DISCONNECT;
        }

        // idle, thus call IdelTask()
        s_vCpuIdleTask();

        // check if 0.5 second time out,
        // if no key input during this period, thus return 0
        if (g_byTimer > (TICK_PER_SEC / 2)) {
            // reset timer counter
            g_byTimer = 0;
            return 0;
        }
    }

    // increase s_byRingOutPtr with wrap around
    s_byRingOutPtr = (s_byRingOutPtr + 1) % UART_RING_LEN;
    return s_abyUartRxRing[s_byRingOutPtr];
}


// unit of wDelay is ms for 8051 at 25MHz
// BEWARE: wDelay will overflow when wDelay > 851
void PLATvDelay (UINT16 wDelay) DIRECT_FUNTYPE_REENT
{
#ifdef __MODULE_WEB_SMART
    DIRECT_MEMTYPE_DATA UINT16 ui;
#else
    UINT16 ui;
#endif

    wDelay = 77 * wDelay - 5; // DON'T change this formula
    for (ui = 0; ui < wDelay; ui++)
        ;
}


void PLATvCpuInit (void) DIRECT_FUNTYPE_REENT
{
    EA = 0;                             // disable CPU interrupt
    TR0 = 0;                            // stop timer 0
    TR1 = 0;                            // stop timer 1

    TMOD  = 0x21;                       // TMOD: timer 0: mode 1, 16-bit timer;
                                        //       timer 1: mode 2, 8-bit reload timer
    PLATvTimer0Init();
    TH1   = 249;                        // TH1:  reload value for 9600 baud @ 25MHz

    PCON &= 0x7f;                       // disable double baud rate
}


void PLATvCpuReset (void) DIRECT_FUNTYPE_REENT
{
    #pragma asm
        JMP 0
    #pragma endasm
}