I2C求助：DSP 2000系列芯片读写EEPROM数据，程序显示没有接收到数据，不知道什么原因？？？？？？？求各位大神帮帮忙。。。

DSP-TMS320F2801做主机，产生时钟200KHz时钟SCL时钟，EEPROM是24LC128

void EEPROM_R(Uint16 address,Uint16 n,Uint16 s)
{
Uint16 i,data_temp;

// Check if bus busy
if (I2caRegs.I2CSTR.bit.BB != 0)//总线忙位，不能手动清除
{
return;
}

I2caRegs.I2CSAR = 0x50;// Setup slave address-7bit

I2caRegs.I2CCNT = 2;

I2caRegs.I2CMDR.all = 0x6620;// Send data to setup EEPROM address

if(I2caRegs.I2CSTR.bit.NACK != 0) return;

//存储器首地址-2字节
while(I2caRegs.I2CSTR.bit.XRDY != 1);
I2caRegs.I2CDXR = (address>>8);
if(I2caRegs.I2CSTR.bit.NACK != 0) return;
while(I2caRegs.I2CSTR.bit.XRDY != 1);
I2caRegs.I2CDXR = (address&0x00FF);
if(I2caRegs.I2CSTR.bit.NACK != 0) return;

//DELAY_US(100);
I2caRegs.I2CSAR = 0x50;// Setup slave address-7bit

I2caRegs.I2CCNT = (n<<1);

I2caRegs.I2CMDR.all = 0x6C20;

if(I2caRegs.I2CSTR.bit.NACK != 0) return;

for(i=0;i<n;i++)
{
while(I2caRegs.I2CSTR.bit.RRDY != 1);
data_temp = (I2caRegs.I2CDRR & 0x00FF);
if(I2caRegs.I2CSTR.bit.NACK != 0) return;

while(I2caRegs.I2CSTR.bit.RRDY != 1);
data_temp |= I2caRegs.I2CDRR << 8;
if(I2caRegs.I2CSTR.bit.NACK != 0) return;

MK_Data[s+i] = data_temp;
}

do{}while(I2caRegs.I2CSTR.bit.SCD != 1); //是否有停止信号
}