程式還沒有時間去詳讀，先認為寫入 EEPROM 寫入時間問題。因為在規範裡 24LC04 的寫入時間最大值為 10mS 所以再做第二筆寫入時一定要Delay 10mS 或 Polling 下一筆資料的 ACK 來決定是否可以送出第二筆的寫入資料。在這裡EEPROM 回復一個 NACK 代表上一次的寫入資料還沒完成要你在等一下。

APP001 18F452 MPLAB 7.5
請問我要將8筆資料寫入 EEPROM內 ,但每次都寫完第二筆後都會卡再這一行 while(SSPCON2bits.ACKSTAT);
我是照著範例程式W401 ex6.2改ㄉ
謝謝!!!

#include <p18f452.h>
#include <delays.h>
#include <timers.h>
#include <i2c.h>
void Initialize_I2C_Master(void);
void EEPROM_Write(unsigned char,unsigned char,unsigned char);
unsigned char EEPROM_Read(unsigned char,unsigned char);
void EEPROM_ACK(unsigned char);
void I2C_Done(void);
unsigned char I2C_Read_Buffer [32];

/* define following variable in data memory at Access Bank */
#pragma udata access My_RAM
near unsigned char Debounce;
//near unsigned char Send_Addr;
//near unsigned char Send_Data;
near unsigned char Send_Length;
near unsigned char Read_Data;
#pragma udata
#define EE_CMD 0xA0

//***************************************
//* Program Main ( ) *
//***************************************
void main(void)
{
TRISD=0x00; // Set PortD for Output
PORTD=0x00; // Initila LED display = 0x80
ADCON1=0b00000110; Initialize_I2C_Master( );
PORTD=0x01;
EEPROM_Write(EE_CMD,0x00,0x9C);
PORTD=0x02;
EEPROM_Write(EE_CMD,0x01,0x04);
PORTD=0x04;
EEPROM_Write(EE_CMD,0x02,0xAD);
PORTD=0x08;
EEPROM_Write(EE_CMD,0x03,0x7E);
PORTD=0x10;
EEPROM_Write(EE_CMD,0x04,0xD4);
PORTD=0x20;
EEPROM_Write(EE_CMD,0x05,0x23);
PORTD=0x40;
EEPROM_Write(EE_CMD,0x06,0x00);
PORTD=0x80;
EEPROM_Write(EE_CMD,0x07,0x00);
}
//************************************************
//* Initial I2C Master Mode with 7 bits Address *
//* Clock Speed : 100KHz @16MHz *
//************************************************
void Initialize_I2C_Master(void)
{
OpenI2C(MASTER,SLEW_ON);
SSPADD= 28;
}

//***********************************************
//* Random Read a Byte from EEPROM *
//* - ctrl : Control Byte of EEPROM (Write) *
//* (Ctrl +1 ) : Read Command *
//* - addr : Address Byte of EEPROM *
//* - Return : Read Data from EEPROM *
//***********************************************
unsigned char EEPROM_Read(unsigned char ctrl,unsigned char addr)
{
unsigned char f;

IdleI2C(); // ensure module is idle
StartI2C(); // Start condition
I2C_Done(); // Wait Start condition completed

WriteI2C(ctrl); // Write Control to EEPROM
while(SSPCON2bits.ACKSTAT); // test for ACK condition, if received
I2C_Done(); // Clear SSPIF flag

WriteI2C(addr); // Write Address to EEPROM
while(SSPCON2bits.ACKSTAT); // test for ACK condition, if received
I2C_Done(); // Clear SSPIF flag

RestartI2C(); // initiate Restart condition
I2C_Done();

WriteI2C(ctrl+1); // Write Control to EEPROM
while(SSPCON2bits.ACKSTAT); // test for ACK condition, if received
I2C_Done(); // Clear SSPIF flag

f=ReadI2C(); // Enable I2C Receiver & wait BF=1 until received data
I2C_Done(); // Clear SSPIF flag

NotAckI2C(); // Genarate Non_Acknowledge to EEPROM
I2C_Done();

StopI2C(); // send STOP condition
I2C_Done(); // wait until stop condition is over

return(f); // Return Data from EEPROM
}

//***********************************************
//* Write a Byte to EEPROM *
//* - ctrl : Control Byte of EEPROM *
//* - addr : Location of EEPROM *
//* - data : Data Byte of EEPROM *
//***********************************************
void EEPROM_Write(unsigned char ctrl,unsigned char addr,unsigned char data)
{
IdleI2C(); // ensure module is idle
StartI2C(); // Start condition
I2C_Done(); // Wait Start condition completed and clear SSPIF flag

WriteI2C(ctrl); // Write Control+Write to EEPROM & Check BF flag
while(SSPCON2bits.ACKSTAT); // wait until received the Acknowledge from EEPROM
I2C_Done(); // Clear SSPIF flag

WriteI2C(addr); // Write Address to EEPROM
WriteI2C(addr); // Write Address to EEPROM
Delay10KTCYx(10);
while(SSPCON2bits.ACKSTAT); // wait until received the Acknowledge from EEPROM
I2C_Done();

WriteI2C(data); // Write Data to EEPROM
while(SSPCON2bits.ACKSTAT); // wait until received the Acknowledge from EEPROM
I2C_Done();

StopI2C(); // Stop condition
I2C_Done(); // Wait the Stop condition completed
}

//***********************************************
//* EEPROM Acknowledge Polling *
//* -- The routine will polling the ACK *
//* response from EEPROM *
//* -- ACK=0 return *
//* -- ACK=1 send Restart & loop check *
//***********************************************
void EEPROM_ACK(unsigned char ctrl)
{
unsigned char i;

IdleI2C(); // ensure module is idle
StartI2C(); // Start condition
I2C_Done(); // Wait Start condition completed

WriteI2C(ctrl); // Write Control to EEPROM (WRITE)
I2C_Done(); // Clear SSPIF flag

while (SSPCON2bits.ACKSTAT) // test for Acknowledge from EEPROM
{
for (i=0;i<100;i++); // Delay for next Repet-Start
RestartI2C(); // initiate Repet-Start condition
I2C_Done(); // Wait Repet-Start condition completed
WriteI2C(ctrl); // Write Control to EEPROM (WRITE)
}
I2C_Done(); // Clear SSPIF flag ***
StopI2C(); // send STOP condition
I2C_Done(); // wait until stop condition is over
}

//***********************************************
//* Check I2C action that is completed *
//***********************************************
void I2C_Done(void)
{
while (!PIR1bits.SSPIF); // Completed the action when the SSPIF is Hi.
PIR1bits.SSPIF=0; // Clear SSPIF
}