hd7279.h

来自「本研究设计的智能压力传感器系统具有成本低、可靠性好、响应速度快、智能化程度高等特」· C头文件 代码 · 共 82 行

#ifndef __HD7279_H__
#define __HD7279_H__
void long_delay(void); 
void short_delay(void);  
void write7279(unsigned char, unsigned char);	// 写入HD7279
unsigned char read7279(unsigned char);			// 读HD7279
void send_byte(unsigned char);        			//发送1个字节    
unsigned char receive_byte(void);     			//接受1个字节
sbit cs=P2^0; 	// 
sbit clk=P2^1; 	//
sbit dat=P2^2; 	//  
sbit key=P2^3; 	// 
//****** HD7279A ******
#define CMD_RESET 0xa4      //复位指令
#define DECODE0 0x80        //方式0译码
#define DECODE1 0xc8
#define BLINKCTL 0x88
void write7279(unsigned char cmd, unsigned char dta)
{
send_byte (cmd);
send_byte (dta);
}
unsigned char read7279(unsigned char command)
{
send_byte(command);
return(receive_byte());
}
void send_byte( unsigned char out_byte)
{
unsigned char i;
cs=0;
long_delay();
for (i=0;i<8;i++)
{
if (out_byte&0x80)
{
dat=1;
}
else
{
dat=0;

}
clk=1;
short_delay();
clk=0;
short_delay();
out_byte=out_byte*2;
}
dat=0;
}
unsigned char receive_byte(void)
{
unsigned char i, in_byte;
dat=1;                                  //设为输入状态
long_delay();
for (i=0;i<8;i++)
{
clk=1;
short_delay();
in_byte=in_byte*2;
if (dat)
{
in_byte=in_byte|0x01;
}
clk=0;
short_delay();
}
dat=0;
return (in_byte);
}
void long_delay(void)
{
unsigned char i;
for (i=0;i<0x30;i++);
}
void short_delay(void)
{
unsigned char i;
for (i=0;i<8;i++);
}
#endif