2440 IIC 老是不发生中断

2012-12-29

2440 IIC 总是不发生中断平台是2440，编译器是MDK，现在在做裸机的IIC读写AT24C02，但是总是不发生中断代码如

2440 IIC 总是不发生中断
平台是2440，编译器是MDK，现在在做裸机的IIC读写AT24C02，但是总是不发生中断
代码如下

#include <string.h>
#include "2440addr.h"
#include "2440lib.h"
#include "def.h"
#include "IIC.h"

static U8 _iicData[IICBUFSIZE];
static volatile int _iicDataCount;
static volatile int _iicStatus;
static volatile int _iicMode;
static int _iicPt;

//===================================================================
//       SMDK2440 IIC configuration
//  GPE15=IICSDA, GPE14=IICSCL
//  "Interrupt mode" for IIC block
//===================================================================

//******************[ Test_Iic ]**************************************
void Test_Iic(void)
{
    unsigned int i,j,save_E,save_PE;
    static U8 data[256];

    Uart_Printf("\nIIC Test(Interrupt) using AT24C02\n");

    save_E   = rGPECON;
    save_PE  = rGPEUP;
    rGPEUP  |= 0xc000;                  //Pull-up disable
    rGPECON |= 0xa00000;                //GPE15:IICSDA , GPE14:IICSCL

    pISR_IIC = (unsigned)IicInt;
    rINTMSK &= ~(BIT_IIC);

      //Enable ACK, Prescaler IICCLK=PCLK/16, Enable interrupt, Transmit clock value Tx clock=IICCLK/16
      // If PCLK 50.7MHz, IICCLK = 3.17MHz, Tx Clock = 0.198MHz
    rIICCON = (1<<7) | (0<<6) | (1<<5) | (0xf);

    rIICADD  = 0x10;                    //2440 slave address = [7:1]地址不是 000 吗？为什么这里配置为0001000呢  只要后三位是0应该就行了。
    rIICSTAT = 0x10;                    //IIC bus data output enable(Rx/Tx)（模式没有进行配置）
rIICLC = (1<<2)|(1);  // Filter enable, 15 clocks SDA output delay       added by junon   （应该是5clocks）

    Uart_Printf("Write test data into AT24C02\n");

    for(i=0;i<256;i++)//这里进行了256次写操作，也就是函数Wr24C080(0xa0,(U8)i,i);每次只进行一个数据的写操作。
        Wr24C080(0xa0,(U8)i,i);//slvaddr, addr,  data
        //而且从i从0递增到255也能够看出，写数据的地址是从EEPROM的最低地址0进行写直到，256

    for(i=0;i<256;i++)
        data[i] = 0;

    Uart_Printf("Read test data from AT24C02\n");

    for(i=0;i<256;i++)
        Rd24C080(0xa1,(U8)i,&(data[i]));

        //Line changed 0 ~ f
    for(i=0;i<16;i++)
    {
        for(j=0;j<16;j++)
            Uart_Printf("%2x ",data[i*16+j]);
        Uart_Printf("\n");
    }
    rINTMSK |= BIT_IIC;
    rGPEUP  = save_PE;
    rGPECON = save_E;
}

//*************************[ Wr24C080 ]****************************
void Wr24C080(U32 slvAddr,U32 addr,U8 data)
{
    _iicMode      = WRDATA;
    _iicPt        = 0;
    _iicData[0]   = (U8)addr;
    _iicData[1]   = data;
    _iicDataCount = 2;

    rIICDS   = slvAddr;                 //0xa0
    rIICSTAT = 0xf0;                    //MasTx,Start
      //Clearing the pending bit isn't needed because the pending bit has been cleared.

    while(_iicDataCount!=-1);

    _iicMode = POLLACK;//改变模式？？？？

    while(1)
    {
        rIICDS     = slvAddr;
        _iicStatus = 0x100;
        rIICSTAT   = 0xf0;              //MasTx,Start
        rIICCON    = 0xaf;              //Resumes IIC operation.

        while(_iicStatus==0x100);

        if(!(_iicStatus&0x1))
            break;                      //When ACK is received
    }
    rIICSTAT = 0xd0;                    //Stop MasTx condition
    rIICCON  = 0xaf;                    //Resumes IIC operation.
    Delay(1);                           //Wait until stop condtion is in effect.
       //Write is completed.
}

//**********************[ Rd24C080 ] ***********************************
void Rd24C080(U32 slvAddr,U32 addr,U8 *data)
{
    _iicMode      = SETRDADDR;
    _iicPt        = 0;
    _iicData[0]   = (U8)addr;
    _iicDataCount = 1;

    rIICDS   = slvAddr;
    rIICSTAT = 0xf0;                    //MasTx,Start
      //Clearing the pending bit isn't needed because the pending bit has been cleared.
    while(_iicDataCount!=-1);//随机读分成了两段，这是第一段：设备地址 + 字地址

    _iicMode      = RDDATA;
    _iicPt        = 0;
    _iicDataCount = 1;

    rIICDS        = slvAddr;
    rIICSTAT      = 0xb0;               //MasRx,Start
    rIICCON       = 0xaf;               //Resumes IIC operation.
    while(_iicDataCount!=-1);//第二段：设备地址 + 数据内容

    *data = _iicData[1];
}

//-------------------------------------
void __irq IicInt(void)
{
    U32 iicSt,i;

    rSRCPND = BIT_IIC;          //Clear pending bit
    rINTPND = BIT_IIC;
    iicSt   = rIICSTAT;

    if(iicSt & 0x8){}           //When bus arbitration is failed.
    if(iicSt & 0x4){}           //When a slave address is matched with IICADD
    if(iicSt & 0x2){}           //When a slave address is 0000000b
    if(iicSt & 0x1){}           //When ACK isn't received

    switch(_iicMode)
    {
       case POLLACK:
           _iicStatus = iicSt;
           break;

       case RDDATA:
           if((_iicDataCount--)==0)
           {
               _iicData[_iicPt++] = rIICDS;
               rIICSTAT = 0x90;                 //Stop MasRx condition

               rIICCON  = 0xaf;                 //Resumes IIC operation.
               Delay(1);                        //Wait until stop condtion is in effect.
                                                //Too long time...
                                                //The pending bit will not be set after issuing stop condition.
               break;
           }
           _iicData[_iicPt++] = rIICDS;         //The last data has to be read with no ack.

           if((_iicDataCount)==0)
               rIICCON = 0x2f;                  //Resumes IIC operation with NOACK.
           else
               rIICCON = 0xaf;                  //Resumes IIC operation with ACK
               break;

        case WRDATA:
            if((_iicDataCount--)==0)
            {
                rIICSTAT = 0xd0;                //Stop MasTx condition
                rIICCON  = 0xaf;                //Resumes IIC operation.
                Delay(1);                       //Wait until stop condtion is in effect.
                       //The pending bit will not be set after issuing stop condition.
                break;

            }
            rIICDS = _iicData[_iicPt++];        //_iicData[0] has dummy.
            for(i=0;i<10;i++);                  //for setup time until rising edge of IICSCL

            rIICCON = 0xaf;                     //resumes IIC operation.
            break;

        case SETRDADDR:
//          Uart_Printf("[ S%d ]",_iicDataCount);
            if((_iicDataCount--)==0)
                break;                          //IIC operation is stopped because of IICCON[4]
            rIICDS = _iicData[_iicPt++];
            for(i=0;i<10;i++);                  //For setup time until rising edge of IICSCL
            rIICCON = 0xaf;                     //Resumes IIC operation.
            break;

        default:
            break;
    }
}
这时事例程序的代码，我自己写的也是无法进入到中断中去，，我已经把我自己的源程序时钟频率改的和事例的时钟频率一致了，但是仍然不中断。
程序一直停在写函数里面的
while(_iicDataCount!=-1);死循环，并且显示_iicDataCount=2；根本就一直没有变，这可能是什么原因呀？或者请大家推荐一下我遇到这个问题，怎么去调试呀？
[解决办法]
你的中断都没放开啊
[解决办法]
我的也不能进入中断，但是你那个上面最明显的错误就是rGPECON=0xa00000;因为用到的是GPE15和GPE14，按道理应该是rGPECON=0xa0000000;

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