將那一行程式改成 while(SSPcon2bits.RCEN) 試試看

Dear all,

小弟現在正在APP013上使用P18F4550嘗試透過I2C去讀取LM73(Sensor)的Produce ID. 程式內容如下:

#include "P18F_LCD.h"
#include "i2c.h"
#include "delays.h"


void OpenLCD(void);
void Initialize_I2C_Master(void);
void I2C_Done(void);


void main(void)
{

union {
char b[2];
int data;
} temp_data;


OpenI2C(MASTER,SLEW_OFF);
//Fosc=24MHz; Fre=100KHz
SSPADD=59;


IdleI2C();
StartI2C();

WriteI2C(0x90);
//value = WriteI2C((int)write_addr); // Addr: R/W: 0 -> Write
AckI2C();

WriteI2C(0x7);
//Read Produce Id

RestartI2C();

WriteI2C(0x91);
// Addr: R/W: 1 -> Read

temp_data.b[0] = ReadI2C();
//High_Value

temp_data.b[1]= ReadI2C();
//Low_Value

NotAckI2C();

StopI2C();

CloseI2C();

}



在執行以上程式後, 程序總是會停在i2c_read.c裡面的(紅色字體):

unsigned char ReadI2C( void )
{
SSPCON2bits.RCEN = 1; // enable master for 1 byte reception
while ( !SSPSTATbits.BF ); // wait until byte received
return ( SSPBUF ); // return with read byte
}

請問這是卡在哪?


P.S 我有檢查過線路, 並沒有短路或是斷路發生