//注意晶振8000000,7372800

#include<iom128v.h>
#include <macros.h>
#define F_CPU 7372800		
#define uchar unsigned char 
#define uint unsigned int

void conversion(unsigned int i);
void ADXL345_init(void); 
unsigned char display[4]={0,0,0,'g'};//显示数据
void uart_putchar(uchar data);




void conversion(unsigned int i)  
{  
   
  // 	display[0]=i/10000+0x30 ;
  //  i=i%10000;    //取余运算
	display[0]=i/1000+0x30 ;
    i=i%1000;    //取余运算
    display[1]=i/100+0x30 ;
    i=i%100;    //取余运算
    display[2]=i/10+0x30 ;
 //  i=i%10;     //取余运算
 //   display[3]=i+0x30;  
}
void delay(unsigned int ms)
{
        unsigned int i,j;
	for(i=0;i<ms;i++)
	   {
	   for(j=0;j<1141;j++);
       }
   } 
//初始化SPI接口
void init_SPI(void)
{
    SPCR = (1<<SPE)|(1<<MSTR)|(0<<DORD)|(1<<SPR0)|(1<<CPOL)|(1<<CPHA);		
    // 使能SPI接口，主机模式，LSB低位在先,模式0,16分频，SPI时钟约460KHz

}
/*-----------------------------------------------------------------------
Single_SPI    : 使用SPI接口读写数据到
 
输入参数：	addr:	    地址
			comm:		写入的命令;
   (SPI的收发是同时进行的)
-----------------------------------------------------------------------*/
//  ********************此处有改动*********************8

/* unsigned short SPI1_Write(unsigned short data)
{
 SPDR=data;
 while(!(SPSR&(1<<SPIF)));
  return SPDR;
}

unsigned short SPI1_Read(unsigned short data1)
{
unsigned short temp;
 SPDR=data1;
 while(!(SPSR&(1<<SPIF)));
 temp=SPDR;
 return temp;
 
}
*/
unsigned short SPI_trans(unsigned short data1)
{
unsigned short temp;
 SPDR=data1;
 while(!(SPSR&(1<<SPIF)))
 {asm("NOP");}
 temp=SPDR;
 return temp;
 
}

void	spi_write(unsigned char addr,unsigned char comm)
{   
	
 unsigned short internal = 0;
  internal = addr | 0X00;                 // Register and Write bit

   PORTB=PORTB&0xfe;//片选
   
//  SPI1_Write(internal);
 // SPI1_Write(comm);
 SPI_trans(internal);
 SPI_trans(comm);
 PORTB=PORTB|0x01;//关闭片选
}

unsigned short spi_read(unsigned short address) 
{
  unsigned short internal = 0,data2=0;
  internal = address | 0x80;                  // Register and Read bit

 PORTB=PORTB&0xfe;//片选
//SPI1_Write(internal);

 SPI_trans(internal);
 internal = SPI_trans(0);//为什么要READ 0
 
 
  PORTB=PORTB|0x01;//关闭片选

  return internal;

}

void ADXL345_init(void)             //adxl345初始化
{   
	 spi_write(0x31,0x0B);   //测量范围,正负16g，13位模式

	 spi_write(0x2C,0x08);   //速率设定为12.5 参考pdf13页

	 spi_write(0x2D,0x08);   //选择电源模式   参考pdf24页

	 spi_write(0x2E,0x80);   //使能 DATA_READY 中断

	 spi_write(0x1E,0x00);   //X 偏移量 根据测试传感器的状态写入pdf29页

	 spi_write(0x1F,0x00);   //Y 偏移量 根据测试传感器的状态写入pdf29页

	 spi_write(0x20,0x05);   //Z 偏移量 根据测试传感器的状态写入pdf29页
	 
}


void uart0_init(unsigned int baud)
{
uint tmp;
tmp= F_CPU/baud/16-1; 	// 设置波特率
UBRR0H = (uchar)(tmp>>8);
UBRR0L = (uchar)tmp;										  
UCSR0B = (1<<RXEN0)|(1<<TXEN0); 		//接收器与发送器使能
UCSR0C = (1<<USBS0)|(1<<UCSZ01)|(1<<UCSZ00);// 设置帧格式: 8 个数据位, 2 个停止位
}

/*-----------------------------------------------------------------
函数名称: uart_putchar(uchar data)
函数功能: 数据发送【发送5 到8 位数据位的帧】
参    数: 
返 回 值: 无
-----------------------------------------------------------------*/
void uart_putchar(uchar data)
{
while ( !( UCSR0A & (1<<UDRE0)) )// 等待发送缓冲器为空 
;
UDR0 = data;		   			  // 将数据放入缓冲器，发送数据 
} 

/*******************************
串口发x*/
void uart_x(void)
{   float temp;
    int x;

    x=spi_read(0x33);
	x=(x<<8)+spi_read(0x32);
	uart_putchar('x');
	uart_putchar(':'); 
	if(x<0){
	 x=-x;
     uart_putchar('-');       //显示负符号位
	}
	else 
	uart_putchar(' ');        //显示空格
    temp=(float)x*3.9;  //计算数据和显示,查考ADXL345快速入门第4页
    conversion(temp);          //转换出显示需要的数据
	
    uart_putchar(display[0]); 
	uart_putchar('.'); 
    uart_putchar(display[1]); 
    uart_putchar(display[2]); 
	uart_putchar('g'); 

}
//*******************************
//串口发y
void uart_y(void)
{   float temp;
    int y;

    y=spi_read(0x35);
	y=(y<<8)+spi_read(0x34);
	uart_putchar('y');
	uart_putchar(':'); 
	if(y<0){
	 y=-y;
     uart_putchar('-');       //显示负符号位
	}
	else 
	uart_putchar(' ');        //显示空格
    temp=(float)y*3.9;  //计算数据和显示,查考ADXL345快速入门第4页
    conversion(temp);          //转换出显示需要的数据
	
    uart_putchar(display[0]); 
	uart_putchar('.'); 
    uart_putchar(display[1]); 
    uart_putchar(display[2]); 
	uart_putchar('g'); 

}
//*******************************
//串口发z
void uart_z(void)
{   float temp;
    int z;

    z=spi_read(0x37);
	z=(z<<8)+spi_read(0x36);
	uart_putchar('z');
	uart_putchar(':'); 
	if(z<0){
	 z=-z;
     uart_putchar('-');       //显示负符号位
	}
	else 
	uart_putchar(' ');        //显示空格
    temp=(float)z*3.9;  //计算数据和显示,查考ADXL345快速入门第4页
    conversion(temp);          //转换出显示需要的数据
	
    uart_putchar(display[0]); 
	uart_putchar('.'); 
    uart_putchar(display[1]); 
    uart_putchar(display[2]); 
	uart_putchar('g'); 

}

/*******************************
主程序
*******************************/
void main(void)
{	
unsigned short a;
    uart0_init(9600);
	//PORTB =(1<<PB2);//关键
  DDRB =(1<<DDB0)|(1<<DDB1)|(1<<DDB2);//关键
  DDRB&=~(1<<DDB3);
	init_SPI();  
	ADXL345_init();

	while(1)
	{
	
	a=spi_read(0x00);
	//uart_putchar(a); 
	
	uart_x();      //显示       
	
	uart_y();//显示y
	uart_z();      //显示z
	delay(100); 
   }
	
}