TWI用作EEPROM的驱动(IIC)

/****************************************************************************
* 名称 ： Reset_TWI
* 功能 ： 复位 TWI接口
* 入口参数 ：无
* 返回值 ：无
****************************************************************************/
void Reset_TWI(void)
{
     //RESET_TWI CONTROLLER
*pTWI_CONTROL = RESET_TWI;
ssync();

//CLEAR ALL ERRONOUS CONDITIONS BEFORE ENABLING TWI
*pTWI_MASTER_STAT = BUFWRERR | BUFRDERR | LOSTARB | ANAK | DNAK;
ssync();

//CLEAR ALL INTERRUPTS BEFORE ENABLING TWI
*pTWI_INT_STAT = SINIT | SCOMP | SERR | SOVF | MCOMP | MERR | XMTSERV | RCVSERV;
ssync();

//FLUSH THE FIFOs - BOTH TX AND RX.
*pTWI_FIFO_CTL = XMTFLUSH | RCVFLUSH;
ssync();
}

/****************************************************************************
* 名称 ： TWI_MasterMode_Write
* 功能 ： TWI接口写数据
* 入口参数 ：无
* 返回值 ：无
****************************************************************************/
void TWI_MasterMode_Write(unsigned short DeviceAddr, unsigned short *TWI_Data_Pointer, unsigned short TX_Count, unsigned short TWI_TX_Length)
{
int i, j;
//FLUSH THE FIFOs - BOTH TX AND RX.
*pTWI_FIFO_CTL = XMTFLUSH | RCVFLUSH;
ssync();

*pTWI_MASTER_STAT = BUFWRERR | BUFRDERR | LOSTARB | ANAK | DNAK;
ssync();

    *pTWI_FIFO_CTL = 0;     // Clear the bit manually
*pTWI_CONTROL = TWI_ENA | PRESCALE_VALUE; // PRESCALE = fsclk/10MHz
*pTWI_CLKDIV = ((CLKDIV_HI) << 8) | (CLKDIV_LO);      // For 100KHz SCL speed: CLKDIV = (1/100KHz)/(1/10MHz) = 100 -> SCL symetric: CLKHI = 50, CLKLOW = 50
*pTWI_MASTER_ADDR = DeviceAddr;   // Target address (7-bits plus the read/write bit the TWI controls
for (i = 0; i < TX_Count; i++)
{
  delay();
     // # of configurations to send to the sensor
  *pTWI_XMT_DATA8 = *TWI_Data_Pointer++;  // Pointer to an array and load a value where a list of data is located
  *pTWI_MASTER_CTL = (TWI_TX_Length<<6) | MEN;// | FAST;      // Start transmission
  for (j = 0; j < (TWI_TX_Length-1); j++)
  {
    // # of transfers before stop condition
   while (*pTWI_FIFO_STAT == XMTSTAT)     // wait to load the next sample into the TX FIFO
    ssync();

   *pTWI_XMT_DATA8 = *TWI_Data_Pointer++;  // Load the next sample into the TX FIFO. Pointer to an array where a list of data is located
   ssync();
  }
    
  while ((*pTWI_INT_STAT & MCOMP) == 0)    // Wait until transmission complete and MCOMP is set
   ssync();
  
  *pTWI_INT_STAT = XMTSERV | MCOMP;     // service TWI for next transmission
  delay();
}
asm("nop;");
asm("nop;");
asm("nop;");

}

这个是我在论坛里看到的TWI的驱动。有几点不太明白：

1：TWI_TX_Length是发送的数据长度，是否包括从机的地址？

2：按照IIC协议第一个字节应该是从机的地址+读/写位；那么TWI_Data_Pointer第一个字节是否是从机的地址+读/写位？

如果我想向从地址为0x01发送0x02,0x03,0x04三个数据TWI_TX_Length是多少？TWI_Data_Pointer指向的数据是怎样的?

主机发送过程中，运行完  *pTWI_MASTER_CTL = (TWI_TX_Length<<6) | MEN;// | FAST;      // Start transmission