松翰C程序檢單例程
#include?"define.h"
#include?"sn8p2501b.h"
//------------------------------------------延時(shí)
void delay(void)
{
?for(Z=15;Z!=0;Z--)
?{};
}
//------------------------------------------開始
void start_i2c(void)
{
?P_SCL=1;
?delay();
?P_SDA=1;
?delay();
?P_SDA=0;
?delay();
?P_SCL=0;
?delay();
}
//------------------------------------------停止
void stop_i2c(void)
{
?P_SDA=0;
?P_SCL=1;
?delay();
?P_SDA=1;
}
//------------------------------------------應(yīng)答信號(hào)
void ack_i2c(void)
{
?delay();
?P_SDA=0;
?delay();
?P_SCL=1;
?delay();
?P_SCL=0;
?delay();
?P_SDA=1;
}
//------------------------------------------非應(yīng)答信號(hào)
void noack_i2c(void)
{
?P_SDA=1;
?P_SCL=1;
?delay();
?P_SCL=0;
}
//------------------------------------------寫
void write_i2c(unsigned int writer_data)
{
?unsigned int i;
?for(i=0;i<8;i++)
?{
?FC=0;
?writer_data=writer_data<<1;
?if(FC)? P_SDA=1;
?else ?P_SDA=0;
?delay();
?P_SCL=1;
?delay();
?P_SCL=0;
?}
}
//------------------------------------------讀
?
unsigned int read_i2c(void)
{
?unsigned int i,j,k;
?i=0;
?for(j=0;j<8;j++)
?{
?k++;
?i=i<<1;
?delay();
?P_SDA=1;
?delay();