[问答]

24c02问题

//==============================================================================
// Example of IIC communication between 9S12XEP100 and EEPROM FM24C256
// BUSCLK = 8MHz
// SCL = 91kHz
// I2C1 is used for commnication

//==============================================================================
#include    /* common defines and macros */
#include "derivative.h"    /* derivative-specific definitions */
//----------------------------

#define MaxLen    128 //
#define  slaveread  0xA1
#define  slavewrite 0xA0
unsigned char RD_data;

//--------------------------
byte WrData[8];
byte RdData[8];
byte RdBuf;
word length;
unsigned char x;
//---
typedef union
{
  word EE_Address;
  struct
  {
byte Address_H;
byte Address_L;
  }Bytes;
}tAddr;
tAddr ADDR;

#define Address ADDR.EE_Address
#define Addr_L ADDR.Bytes.Address_L
#define Addr_H ADDR.Bytes.Address_H

//******  Init routines  *******************
//--
void IIC0_init(void)
{
IIC0_IBFD = 0x4C;
IIC0_IBAD = 0x00;
IIC0_IBCR = 0x80;
//IIC0_IBSR_IBAL = 1;
}
//--

//---------------------------------------------------------
void IIC_write_nbytes(word addr, byte len)
{
  byte i;
Address = addr; // load address;
IIC0_IBCR_TXAK = 0; ;
IIC0_IBCR |= 0x30; // RX/TX = 1; MS/SL = 1; TXAK = 0;
// And generate START condition;
//-------start of transmit first byte to IIC bus-----
IIC0_IBDR = slavewrite; // Address the slave and set up for master transmit;

while (!IIC0_IBSR_IBIF); // wait until IBIF;
IIC0_IBSR_IBIF=1; // clear the interrupt event flag;
while(IIC0_IBSR_RXAK); // check for RXAK;
//-----Slave ACK occurred------------
IIC0_IBDR = Addr_H; // Send high byte of the word address;
while (!IIC0_IBSR_IBIF); // wait until IBIF;
IIC0_IBSR_IBIF=1; // clear the interrupt event flag;
while(IIC0_IBSR_RXAK); // check for RXAK;
//-----Slave ACK occurred------------
IIC0_IBDR = Addr_L; // Send low byte of the word address;
while (!IIC0_IBSR_IBIF); // wait until IBIF;
IIC0_IBSR_IBIF=1; // clear the interrupt event flag;
while(IIC0_IBSR_RXAK); // check for RXAK;
//-----Slave ACK occurred------------
for(i=0;i {
  IIC0_IBDR = WrData;//data;
  while (!IIC0_IBSR_IBIF); // wait until IBIF;
  IIC0_IBSR_IBIF=1; // clear the interrupt event flag;
  while(IIC0_IBSR_RXAK); // check for RXAK;
}
//-----Slave ACK occurred------------
IIC0_IBCR_MS_SL = 0; // generate STOP condition;
}

//-------------------------------------------------------------------------
void IIC_read_nbytes(word addr,byte len)
{
byte dummy;
byte i;
Address = addr;
length=len;
if(length>=MaxLen)
{
  length=MaxLen;
}
IIC0_IBCR_TXAK = 0; // TXAK = 0;
IIC0_IBCR |= 0x30; // RX/TX = 1; MS/SL = 1; TXAK = 0;
// And generate START condition;
IIC0_IBDR = slavewrite; // Address the slave and set up for master transmit;
while (!IIC0_IBSR_IBIF); // wait until IBIF;
IIC0_IBSR_IBIF=1; // clear the interrupt event flag;
while(IIC0_IBSR_RXAK); // check for RXAK;
//-----Slave ACK occurred------------
IIC0_IBDR = Addr_H; // Send high byte of word address;
while (!IIC0_IBSR_IBIF); // wait until IBIF;
IIC0_IBSR_IBIF=1; // clear the interrupt event flag;
while(IIC0_IBSR_RXAK); // check for RXAK;
//-----Slave ACK occurred------------
IIC0_IBDR = Addr_L; // Send low byte of word address;
while (!IIC0_IBSR_IBIF); // wait until IBIF;
IIC0_IBSR_IBIF=1; // clear the interrupt event flag;
while(IIC0_IBSR_RXAK); // check for RXAK;
//-----Slave ACK occurred------------
IIC0_IBCR_RSTA = 1; // set up repeated start;
IIC0_IBDR = slaveread; // (slave_address) | (RW = 1);
while (!IIC0_IBSR_IBIF); // wait until IBIF;
IIC0_IBSR_IBIF=1; // clear the interrupt event flag;
while (IIC0_IBSR_RXAK); // check for RXAK;
//-----Slave ACK occurred------------
IIC0_IBCR_TX_RX = 0; // set up to receive;
dummy=IIC0_IBDR;//RD_data = IIC0_IBDR; // dummy read;
for(i=0;i {
  if(i==7){
while(!IIC0_IBSR_IBIF);
IIC0_IBSR_IBIF = 1;
RdData[7]=IIC0_IBDR;
  }
  else{
  while(!IIC0_IBSR_IBIF);
  IIC0_IBSR_IBIF=1;
  while (IIC0_IBSR_RXAK);
  RdData=IIC0_IBDR;
  }
}
IIC0_IBCR_TXAK = 1; // acknowledge disable;
while (!IIC0_IBSR_IBIF); // wait until IBIF;
IIC0_IBSR_IBIF=1; // clear the interrupt event flag;
IIC0_IBCR_MS_SL = 0; // generate stop signal;
RD_data = IIC0_IBDR; // read right data;
}

//******  main routines  *******************
void main(void)
{
  unsigned int i;
  unsigned int j,k;
  //---- IIC -----
  IIC0_init();
  WrData[0]=1;
  WrData[1]=0;
  WrData[2]=0;
  WrData[3]=8;
  WrData[4]=6;
  WrData[5]=1;
  WrData[6]=1;
  WrData[7]=255;
  //---- main cycle ---
  //LedPad22Dir=1;
  //LedCpu=1;

do{

IIC_write_nbytes(0x0102,8);
for(j=0;j<0x1000;j++);
   IIC_read_nbytes(0x0102,8);
  //--

  for(j=0;j<50000;j++);
  //LedCpu=~LedCpu;

}
while(1);

  i+=8;

/**/
}
//==============================================================================
这是我用的程序问题就是，

问题就是，程序跑得不是很理想，程序就走到这就走不动了。一直等待一个ACK信号。这是怎么回事呢。但是有时候能跑通！

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