用ICCAVR6编写的mega1max504程序

最近做大赛训练要用到da转换芯片max504，就从网上搜用mage16单片机写的程序，发现没有。就根据芯片的时序图，自己写了个程序，并通过CH451按键控制输出电压大小，还挺好用的，现在分享给大家。用的接法如下图所示，（参考电压为4.096）

#include

#include

#include "CH451.h"

#define uchar unsigned char

#define uint unsigned int

#define MAXCS0 PORTA&=~BIT(PA0)

#define MAXCS1 PORTA|=BIT(PA0)

#define MAXclk0 PORTA&=~BIT(PA1)

#define MAXclk1 PORTA|=BIT(PA1)

#define MAXdin0 PORTA&=~BIT(PA2)

#define MAXdin1 PORTA|=BIT(PA2)

#define MAXdout0 PORTA&=~BIT(PA3)

#define MAXdout1 PORTA|=BIT(PA3)

void port_init()

{

PORTA = 0x00;

DDRA = 0x07;

PORTB = 0x07;

DDRB = 0x07;

PORTC = 0x00;

DDRC = 0x00;

PORTD = 0x00;

DDRD = 0x00;

}

void delay(uint a)

{

uint x,y;

for(x=0;x<1140;x++)

{

for(y=0;y

}

}

void max504_write(uint data)

{

uchar i;

MAXCS1;

MAXclk1 ;

MAXclk0;

MAXCS0 ;

for(i=0;i<16;i++)

{

if(data&0X8000) //先发送4位哑位，msb-lsb，0，0 {MAXdin1;}

else

{MAXdin0;}

data<<=1;

MAXclk1 ;

MAXclk0 ;

}

NOP();

MAXCS1;

NOP();

}

void main()

{

uint da;

uchar key;

port_init();

ch451_init();

ch451_write(CH451_RESET); //ch451初始化

ch451_write(CH451_SYSON2);

ch451_write(CH451_BCD);

LightenAllLed(); //全亮一秒后灭，以检验ch451能否正常工作delay(1000);

ClearLed();

max504_write(0); //启动max504，可有可无

NOP();

NOP();

max504_write(0x07d0);

while(1)

{

key=ch451_read();

if(key!=0)

{

switch(key)

{

case 0x45: //通过按键控制产生不同的电压值

da=0x0000;

break;

case 0x4d:

da=0x007c;

break;

case 0x55:

da=0x00fc;

break;

case 0x5d:

da=0x0178;

break;

case 0x65 :

da=0x01f4;

break;

case 0x4e :

da=0x03e8;

break;

case 0x56 :

da=0x05dc;

break;

case 0x5e :

da=0x07d0;

break;

case 0x66 :

da=0x01f4;

break;

case 0x6e :

da=0x01f4;

break;

case 0x76 :

da=0x01f4;

break;

}

max504_write(da);

}

key=0;

}

}

Ch451头文件，编译时只要将其包含在headers就行了。

#include

#include

#include

/*------宏定义------*/

#define uchar unsigned char

#define uint unsigned int

#define ch451din PORTB

#define ch451dclk0 PORTB&=~BIT(PB1)

#define ch451dclk1 PORTB|=BIT(PB1)

#define ch451load0 PORTB&=~BIT(PB2)

#define ch451load1 PORTB|=BIT(PB2)

#define ch451dout0 PORTB&=~BIT(PB3)

#define ch451dout1 PORTB|=BIT(PB3)

//CH451复位

#define CH451_RESET 0x0201

//设置移动方式-作移、左循、右移、右循

#define CH451_LEFTMOV 0x0300

#define CH451_LEFTCYC 0x0301

#define CH451_RIGHTMOV 0x0302

#define CH451_RIGHTCYC 0x0303

//设置BCD译码方式

#define CH451_BCD 0x0580

//设置数码管闪烁控制

#define CH451_TWINKLE 0x0600

//数码管各位显示

#define CH451_DIG0 0x0800

#define CH451_DIG1 0x0900

#define CH451_DIG2 0x0a00

#define CH451_DIG3 0x0b00

#define CH451_DIG4 0x0c00

#define CH451_DIG5 0x0d00

#define CH451_DIG6 0x0e00

#define CH451_DIG7 0x0f00

#define CH451_SYSOFF 0x0400

///关显示、键盘、看门狗

#define CH451_SYSON1 0x0401

//开显示

#define CH451_SYSON2 0x0403

//开显示、键盘

#define CH451_SYSON3 0x0407

//开显示、键盘、看门狗功能

#define CH451_DSP 0x0500

//设置默认显示方式*/

//CH451初始化

void ch451_init()

{

ch451din=0;

ch451din=1;

}

//输出命令子程序

//定义一个无符号整型变量存储12字节的命令字

void ch451_write(uint command)

{

uchar i;

ch451load0;

for(i=0;i<12;i++)

{

if(command&1)

{ PORTB|=BIT(0);}

else

{PORTB&=~BIT(0);}//ch451din=command&1; ch451dclk0;

ch451dclk1;

//delay_ms(1);

command>>=1;

}

ch451load1;

}

/**************read***************/ unsigned char ch451_read(void )

{

unsigned char i,temp;

unsigned char command,keycode; //定义命令字，和数据存储器

command=0x07; //输入读451命令字

ch451load0;

for(i=0;i<4;i++)

{

// ch451din=command&1; //送入最低位

if((command&1)==0x00)

{PORTB&=~BIT(0);}

else { PORTB|=BIT(0);}

ch451dclk0;

command>>=1; //往右移一位

ch451dclk1; //产生时钟上升沿锁通知CH451输入位数据

}

ch451load1; //产生加载上升沿通知CH451处理命令数据keycode=0; //清除keycode

for(i=0;i<7;i++)

{

keycode<<=1; //数据移入keycode 高位在前低位在后

temp=PINB;

temp>>=3;

keycode|=(temp&0x01); //从高到低读入451的数据

ch451dclk0; //产生时钟下升沿通知CH451输出下一位

ch451dclk1;

}

return(keycode); //反回键值

}

//CH451端口初始化

/*void port_init(void )

{

PORTA = 0x00;

DDRA = 0x00;

PORTB = 0x07;

DDRB = 0x07;

PORTC = 0x00;

DDRC = 0x00;

PORTD = 0x00;

DDRD = 0x00;

}*/

//******************************************************

void LightenAllLed(void)

{

ch451_write(CH451_DIG0+0x88); //1000 1000

ch451_write(CH451_DIG1+0x88);

ch451_write(CH451_DIG2+0x88);

ch451_write(CH451_DIG3+0x88);

ch451_write(CH451_DIG4+0x88);

ch451_write(CH451_DIG5+0x88);

ch451_write(CH451_DIG6+0x88);

ch451_write(CH451_DIG7+0x88);

}

void ClearLed(void)

{

ch451_write(CH451_DIG0+0x10); // 0001 0000

ch451_write(CH451_DIG1+0x10);

ch451_write(CH451_DIG2+0x10);

ch451_write(CH451_DIG3+0x10);

ch451_write(CH451_DIG4+0x10);

ch451_write(CH451_DIG5+0x10);

ch451_write(CH451_DIG6+0x10);

ch451_write(CH451_DIG7+0x10);

}

// ************************* 延时n*ms *************************

void delay_us(int time) //微秒级延时

{

do {

time--; } //*++++++{}********/

while(time>1);

}

void delay_ms(unsigned int time) {

while(time!=0)

{

delay_us(1000);

time--;

}

}