main.c

增强型51单片机fs7821cf卡读写程序

/*
**********************************************************************************************
* Project:	TK7821
* File:		main.c
* Contents: 
*           The main and interrupt handler
*
* $Date: 02/25/05    Jason    v0.1
*        04/21/05    Mingo    v0.2   www.fameg.com
*        12/12/05    Jason    v0.3   Modify the state machine in bus reset
*
* Copyright (c) 2005 Fameg, Inc. All rights reserved
***********************************************************************************************
*/

#include <reg51.h>
#include <stdio.h>
#include <stdlib.h>
#include "Device.h"
#include "UsbDisk.h"
#include "Storage.h"

static bit CfGetFlashInfoFlag = false;
static bit SuspendFlag = false;
bit ResetFlag = false;
xdata UINT16 DelayTimer = 0;
//modify by Hellen 2005/09/30
bit BusResetFlag = false;
bit BusResetCntFlag = false;
xdata UINT32 HwVerNum;

//----------------------------------------------------------------------------
// Timeout every 10 ms
//----------------------------------------------------------------------------
void Timer0() interrupt 1 using 3
{
  // Restore the counter to 10 ms
  TH0 = 0xCE;
  TL0 = 0xE8;

  // Inc the system tick
  if (DelayTimer)
    DelayTimer --;

  if (CmdTimer)
    CmdTimer --;

  if (CfGetFlashInfoTimer)
  {
    CfGetFlashInfoTimer --;
    if (CfGetFlashInfoTimer == 0)
      CfGetFlashInfoFlag = true;
  }
}

//----------------------------------------------------------------------------
// Enter the suspend mode
//----------------------------------------------------------------------------
void EnterSuspend()
{
  BYTE RegValue = CSRRead(USB_BASE + GCTL); //0xF000
  StorageSuspend();
  POWER_LED_CTRL = 1;
  RegValue |= SUSPEND;  //SUSPEND==0x04
  CSRWrite(USB_BASE + GCTL, RegValue);
  while (CSRRead(USB_BASE + GCTL) & SUSPEND);
  // Ignore unstable clock stage for 100ms
  Delay(100);
  POWER_LED_CTRL = 0;
  StorageResume();
}

//----------------------------------------------------------------------------
void main()
{
  TH1 =  0xf8; // For 15MHz CPU Clock
  TH0 = 0xCE;
  TL0 = 0xE8;
  TMOD = 0x21;
  TCON = 0x50;
  IP = 0x02;
  IE = 0x82;
  NormalSpeed(); //STRETCH = 3;

  CSRWrite(USB_BASE + GCTL, CSRRead(USB_BASE + GCTL) | RESET); //0xF000,General control register
  POWER_LED_CTRL = 0;

  HwVerNum = ((UINT32)HwId() << 16) | HwVersion();
 
  CfPowerOn(); // Fix the problem that some CF cards will hold data bus low when power off
  StorageInit();
  UsbInit();

  while (true)
  {
    BYTE Event;

    Event = CSRRead(USB_BASE + EPIE); //0xF001,EP interrupt event 1 register
    if (Event)
    {
      if (Event & (IRQ_RX0 | IRQ_TX0 | IRQ_IN0))
        UsbCtrlIntHandler(Event);   

      if (Event & (IRQ_TX1 | IRQ_RX2))
      {
        UsbBulkIntHandler(Event);
      }
    }

    Event = CSRRead(USB_BASE + USBIE) & (IRQ_USB_RST | IRQ_IDLE_3MS);//0xF005,State interrupt event register
    if (Event)
    {
      CSRWrite(USB_BASE + USBIE, ~Event);

      if (Event & IRQ_USB_RST)
      {
        CSRWrite(USB_BASE + USBADDR, 0); //0xF007,Function address register 0
        CSRWrite(USB_BASE + EPCTL, EN_EP0 | EN_EP1 | EN_EP2 );	   //add by Jason 12/12/2005
		CSRWrite(USB_BASE + EP1_TXCSR, 0x00);
		BusResetFlag = true;
      }

      if (Event & IRQ_IDLE_3MS)
      {
          EnterSuspend();
      }
    }

    Event = CSRRead(CF_BASE + CF_IE) & CF_CARD_CHANGE; //0xF212,CF interrupt status
    if (Event)
    {
      CSRWrite(CF_BASE + CF_IE, ~Event);
      CfIntHandler(Event);
    }
    if (CfGetFlashInfoFlag)
    {
      CfMediaChange();
      CfGetFlashInfoFlag = false;
    }
  }
}