这是一个eeprom的读写程序,用的是M68hc12芯片,希望通过它的spi与eeprom(93lc66)进行读写操作.但实际效果是在进行写操作时,从示波器上看,CLK和DI引脚的波形均正常,但查看eeprom却发现并没有数据写入.在进行读操作时,DI,CLK的波形正常,但DO却始终是高电平(感到奇怪).实在不知道哪里错了,还请熟悉这块芯片的大虾帮忙看看!(郁闷中...)
void main(void)
{
/**初始化**/
DDRS=0X60;
DDRP_DDRP2=1;
PTP_PTP2=1;
SPICR1=0X5C;
SPIBR=0X01;
SPISR_SPIF=1;
WRITE(0xaa,0x55,0x10);
//READ(0x20);
for(;;);
}
/**EWDS**/
void EWDS()
{
buf[1]=0x04;
buf[2]=0x00;
SPI_InOut(buf,2);
}
/**EWEN**/
void EWEN()
{
buf[1]=0x04;
buf[2]=0xc0;
SPI_InOut(buf,2);
}
/**READ**/
unsigned int READ(byte address)
{
unsigned char temp;
unsigned int read_data;
buf[1]=0x06;
buf[2]=address;
buf[3]=0x00;
buf[4]=0x00;
buf[5]=0x00;
SPI_InOut(buf,5);
buf[3]=buf[3]<<1;
temp=buf[4]>>7;
buf[1]=buf[3]|temp;
buf[4]=buf[4]<<1;
buf[2]=buf[4]|buf[5];
read_data=buf[1];
read_data=read_data<<8;
read_data=read_data|buf[2];
return read_data;
}
/**WRITE**/
void WRITE(unsigned char data1,unsigned char data2,unsigned char adress)
{
EWEN();
buf[1]=0x05;
buf[2]=adress;
buf[3]=data1;
buf[4]=data2;
SPI_InOut(buf,4);
delay(1000);
EWDS();
}
/** SPI数据传送子程序 **/
void SPI_InOut(byte SPI_Data[], byte n)
{
byte i;
for (i=1; i<=n; i++)
{
SPIDR = SPI_Data;
while (SPISR_SPIF == 0);
SPI_Data = SPIDR;
}
}
/** DELAY **/
void delay(unsigned int num)
{
while(num!=0){num=num-1;}
}
| 
