pic16f硬件I2C的应用？？？求助！！！

只看该作者 · 2011-7-1 14:11

求大家帮我看看，这个用MSSP模块实现PIC16F1937进行I2C主模式向从模块PCF8576D写数据的程序有什么问题吗？我写过去的显示数据很乱啊

uchar DisBuf[19] = {0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf,0xcf};

void main()
{

OSCCON = 0x7a;
// INTOSCIO, PLL disabled, Fosc = 16MHz

PORTC = 0x60;

LATC = 0x60;

TRISC = 0x9e;
// SCL and SDA is input

SSPADD = 0x09;
// 0x09 for 400kHz at 16MHz

SSPSTAT = 0x00;
// Enable High speed 400kHz slew rate control

SSPCON1 = 0x28;
// Enable I2C Master initially

SSPCON2 = 0x00;
// Clear control bits

SSPCON3 = 0x08;
// Disable all interrupt of I2C Master, keep 300ns on SDA after SCL's falling edge

While(1){

SEN = 1;

while(SEN);

SSPBUF = PCF8576D_Addr & 0xfe;

while(ACKSTAT);

SSPBUF = 0xe0;

while(ACKSTAT);

SSPBUF = 0xc8;

while(ACKSTAT);

SSPBUF = 0x00;

while(ACKSTAT);

for(i=0;i<19;i++){

SSPBUF = DisBuf[i];

while(ACKSTAT);

}

PEN = 1;

while(PEN);
}
}
}
}