在一个很不错的专业国外网站上找到了一些源代码．今天没来得及测试．
该网站网址：
　　 http://www.dsprelated.com/groups/c6x/show/5542.php
相关代码如下：
　　Hi,

I have a problem with I2C again :-)

I send some bytes to a slave transmitter and the last one is answered 
with a NACK. When this happens I2C stops. If I send this to a slave 
which answers the last byte with a ACK all is fine.

I have no EDMA, no IRQ and no csl for this. So I must do it by polling 
the registers. Any idea how I should treat this situation?

AFAIK it is possible for an I2C slave to answer the last byte (if it 
knew its the last one) with an NACK. The I2C module should be able to 
deal with this.

TIA Gustl

This is my code:
----------------
far void pipe_data(unsigned char *typ_string)
{
unsigned char *hw_ptr;
unsigned int i,help;
unsigned char dest[10];
unsigned char address=typ_string[1];
unsigned char number=typ_string[2];
unsigned char ret_number=typ_string[3];
unsigned char *source;

source=&typ_string[4];
send_byte=(void(*)(unsigned char))(0x00000CC8);


// I2C open/reset
I2C_RSET(I2COAR0,I2C_I2COAR_DEFAULT);
I2C_RSET(I2CIMR0,I2C_I2CIMR_DEFAULT);
I2C_RSET(I2CCLKL0,I2C_I2CCLKL_DEFAULT);
I2C_RSET(I2CCLKH0,I2C_I2CCLKH_DEFAULT);
I2C_RSET(I2CCNT0,I2C_I2CCNT_DEFAULT);
I2C_RSET(I2CSAR0,I2C_I2CSAR_DEFAULT);
I2C_RSET(I2CMDR0,I2C_I2CMDR_DEFAULT);
I2C_RSET(I2CPSC0,I2C_I2CPSC_DEFAULT);

// I2c_init
I2C_RSET(I2COAR0,I2C_I2COAR_RMK(I2C_I2COAR_A_OF(0)));
I2C_RSET(I2CIMR0,I2C_I2CIMR_RMK(I2C_I2CIMR_ICXRDY_MSK,
I2C_I2CIMR_ICRRDY_MSK,
I2C_I2CIMR_ARDY_MSK,
I2C_I2CIMR_NACK_MSK,
I2C_I2CIMR_AL_MSK));
I2C_RSET(I2CCLKL0,I2C_I2CCLKL_RMK(I2C_I2CCLKL_ICCL_OF(12-6))); 
I2C_RSET(I2CCLKH0,I2C_I2CCLKH_RMK(I2C_I2CCLKH_ICCH_OF(12-6))); 
I2C_RSET(I2CCNT0,I2C_I2CCNT_RMK(I2C_I2CCNT_ICDC_OF(0)));
I2C_RSET(I2CSAR0,I2C_I2CSAR_RMK(I2C_I2CSAR_A_OF(0)));
I2C_RSET(I2CMDR0,I2C_I2CMDR_RMK(I2C_I2CMDR_NACKMOD_ACK,
I2C_I2CMDR_FREE_BSTOP,
I2C_I2CMDR_STT_NONE,
I2C_I2CMDR_STP_NONE,
I2C_I2CMDR_MST_MASTER,
I2C_I2CMDR_TRX_XMT,
I2C_I2CMDR_XA_7BIT,
I2C_I2CMDR_RM_NONE,
I2C_I2CMDR_DLB_NONE,
I2C_I2CMDR_IRS_RST,
I2C_I2CMDR_STB_NONE,
I2C_I2CMDR_FDF_NONE,
I2C_I2CMDR_BC_BIT8FDF));
I2C_RSET(I2CPSC0,I2C_I2CPSC_RMK(I2C_I2CPSC_IPSC_OF(10-1))); 
// I2C out of reset
I2C_RSET(I2CMDR0,I2C_RGET(I2CMDR0)|_I2C_I2CMDR_IRS_MASK);
// clear BB in case of malfunction slave device
I2C_RSET(I2CSTR0,_I2C_I2CSTR_BB_MASK);
// prepare send
I2C_RSET(I2CSAR0,I2C_I2CSAR_RMK(I2C_I2CSAR_A_OF(address)));
I2C_RSET(I2CCNT0,I2C_I2CCNT_RMK(I2C_I2CCNT_ICDC_OF(number)));
I2C_RSET(I2CDXR0,I2C_I2CDXR_RMK(I2C_I2CDXR_OF(*source)));
source++;
number--;
// starting I2C
I2C_RSET(I2CMDR0,I2C_I2CMDR_RMK(I2C_I2CMDR_NACKMOD_ACK,
I2C_I2CMDR_FREE_BSTOP,
I2C_I2CMDR_STT_NONE,
I2C_I2CMDR_STP_NONE,
I2C_I2CMDR_MST_MASTER,
I2C_I2CMDR_TRX_XMT,
I2C_I2CMDR_XA_7BIT,
I2C_I2CMDR_RM_NONE,
I2C_I2CMDR_DLB_NONE,
I2C_I2CMDR_IRS_NRST,
I2C_I2CMDR_STB_NONE,
I2C_I2CMDR_FDF_NONE,
I2C_I2CMDR_BC_BIT8FDF));
I2C_RSET(I2CMDR0,I2C_I2CMDR_RMK(I2C_I2CMDR_NACKMOD_ACK,
I2C_I2CMDR_FREE_BSTOP,
I2C_I2CMDR_STT_START,
I2C_I2CMDR_STP_STOP,
I2C_I2CMDR_MST_MASTER,
I2C_I2CMDR_TRX_XMT,
I2C_I2CMDR_XA_7BIT,
I2C_I2CMDR_RM_NONE,
I2C_I2CMDR_DLB_NONE,
I2C_I2CMDR_IRS_NRST,
I2C_I2CMDR_STB_NONE,
I2C_I2CMDR_FDF_NONE,
I2C_I2CMDR_BC_BIT8FDF));
while((I2C_RGET(I2CSTR0)&_I2C_I2CSTR_BB_MASK)==0);
// send all bytes
while (number>0) {
if ((I2C_RGET(I2CSTR0)&_I2C_I2CSTR_ICXRDY_MASK)!=0) {
2C_RSET(I2CDXR0,I2C_I2CDXR_RMK(I2C_I2CDXR_OF(*source)));
source++;
number--;
}
}/**/
// wait until all is sent
while((I2C_RGET(I2CSTR0)&_I2C_I2CSTR_BB_MASK)!=0);
while((I2C_RGET(I2CSTR0)&_I2C_I2CSTR_BB_MASK)!=0);
}