关于44b0-IIC问题，请各位倘有帮忙看下

longbiao831

关于44b0-IIC问题，请各位倘有帮忙看下 [复制链接]

我是在网上找的44b0的iic程序，但是在读写E2PROM是总是读出个ff，我的开发板用的是st24c08的E2PROM，这个问题困扰我很久了，我也对照了下时序，也没有发现什么问题，请各位坛友一定要帮这个忙啊！下面是程序：
void Test_Iic(void)
{
unsigned int i,j;
static U8 data[256];
pISR_IIC=(unsigned)IicInt;
rINTMSK=~(BIT_GLOBAL|BIT_IIC);

rIICCON=(1<<7)|(0<<6)|(1<<5)|(0xf); //Enable interrupt, IICCLK=MCLK/16, Enable ACK
//66Mhz/16/(15+1) = 257Khz
rIICADD=0x10; // S3C44B0X slave address

rIICSTAT=0x10;

Uart_Printf(0,"Write test data into KS24C080\n");

for(i=0;i<256;i++)
Wr24C080(0xa0,(U8)i,i);
for(i=0;i<256;i++)
data=0;

Uart_Printf(0,"Read test data from KS24C080\n");
for(i=0;i<256;i++)
Rd24C080(0xa0,(U8)i,&(data));

for(i=0;i<16;i++)
{
for(j=0;j<16;j++)
Uart_Printf(0,"%2x ",data[i*16+j]);
Uart_Printf(0,"\n");
}

}


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

rIICDS=slvAddr;
rIICSTAT=0xf0; //MasTx,Start
//Clearing the pending bit isn't needed because the pending bit has been cleared.
while(_iicDataCount!=-1);

_iicMode=POLLACK;

while(1)
{
rIICDS=slvAddr;//0xa0
_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.
}


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);

_iicMode=RDDATA;

_iicPt=0;
_iicDataCount=1;

rIICDS=slvAddr+1;//这里是我自己加的1，不知道对不对，没有1的时候也是ff，看时序这里是读应该是1
rIICSTAT=0xb0; //MasRx,Start
rIICCON=0xaf; //resumes IIC operation.
while(_iicDataCount!=-1);

*data=_iicData[1];

}



void __irq IicInt(void)
{
U32 iicSt,i;
rI_ISPC=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 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<100;i++); //for setup time until rising edge of IICSCL
rIICCON=0xaf; //resumes IIC operation.
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 NO ACK.
else
rIICCON=0xaf; //resumes IIC operation with ACK
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<100;i++); //for setup time until rising edge of IICSCL
rIICCON=0xaf; //resumes IIC operation.
break;

default:
break;
}
} [ 本帖最后由 longbiao831 于 2011-11-2 09:54 编辑 ]

rocky_z

楼主，麻烦你查看你的短消息哈，我给你发了信息，想问问你是否碰到Flash 烧写方面的问题，谢谢啦！IIC这块我还没调试，抱歉！希望坛友们帮忙解决哈。。。

longbiao831

我看到你的IIS问题 这个我没有看呢 我有现成的程序 老师调好的 还没有看  现在主要卡在这个IIC这里了

rocky_z

我的IIS调试有点进展了，但是没有调通，心里头没有谱，你能不能把IIS调好的程序给我共享一下呢？非常谢谢！！！我的邮箱是：keepfastmoving@yahoo.com.cn谢谢！

longbiao831

求助的问题怎么没有人解答呢？各位坛友，帮个忙吧，这个小问题困扰我好久了。

ddk_ok

接个示波器看看不就知道在哪里出错了吗,

longbiao831

今天换了个实验板试了试，能够执行，输出正常，不知道怎么用示波器检测的，我们板子上的E2PROM是贴片的，求助怎么测啊，还有就是在读函数中进入POLLACK模式是干嘛的，感觉没有这个必要啊，还有根据时序图，在读操作的时候状态字应该是1的但是在程序中，地址没有变化啊，