ATMEGA8单片机+SI5351双通道高频信号发生器

ID:1136941 · 发表于 2025-1-13 15:54

我是个无线电爱好者，平时喜欢DIY高频电路，由于高端的信号发生器价格太高，就制作了这个装置。SI5351是3通道输出的方波PLL信号发生器，驱动是移植后略加修改的，原驱动是一个通道输出，水平所限不能实现3个通道输出。两个通道频率可以分别调节，频率范围500KHZ-120MHZ.以下是源程序：
/*************************
ATMEGA-8L单片机
内部RC时钟8MHZ
***********************************/
#include "mega16.h"
#include "i2c.h"
#include "delay.h"
#asm
  .equ __i2c_port=0x12 //D端口地址0x12
  .equ __sda_bit=6 //6脚
  .equ __scl_bit=7 //7脚
#endasm
#define uchar unsigned char
#define uint unsigned int
#define uint8_t unsigned char
#define uint16_t unsigned int
#define uint32_t  signed long int
/////////////////////////////////////
#define SI_CLK0_CONTROL 16
#define SI_CLK1_CONTROL 17
#define SI_CLK2_CONTROL 18
#define SI_SYNTH_PLL_A 26
#define SI_SYNTH_PLL_B 34
#define SI_SYNTH_MS_0       42
#define SI_SYNTH_MS_1       50
#define SI_SYNTH_MS_2       58
#define SI_PLL_RESET       177

#define SI_R_DIV_1 0x00
#define SI_R_DIV_2 0x16
#define SI_R_DIV_4 0x20
#define SI_R_DIV_8 0x30
#define SI_R_DIV_16 0x40
#define SI_R_DIV_32 0x50
#define SI_R_DIV_64 0x60
#define SI_R_DIV_128 0x70

#define SI_CLK_SRC_PLL_A 0x00
#define SI_CLK_SRC_PLL_B 0x20

#define XTAL_FREQ 25000000 // 晶体频率

#define I2C_START 0x08
#define I2C_START_RPT 0x10
#define I2C_SLA_W_ACK 0x18
#define I2C_SLA_R_ACK 0x40
#define I2C_DATA_ACK 0x28
#define I2C_WRITE 0xc0
#define I2C_READ  0xc1

unsigned char Table[]="0123456789";
unsigned char Data[9];
/**********1602**************/
#define RS_1 PORTC.2=1
#define RS_0 PORTC.2=0

#define EN_1 PORTC.0=1
#define EN_0 PORTC.0=0

#define LCD_D4_1 PORTB.4=1
#define LCD_D4_0 PORTB.4=0

#define LCD_D5_1 PORTB.3=1
#define LCD_D5_0 PORTB.3=0

#define LCD_D6_1 PORTB.2=1
#define LCD_D6_0 PORTB.2=0

#define LCD_D7_1 PORTB.1=1
#define LCD_D7_0 PORTB.1=0
//////////函数声明//////////////////////////////////
void i2cSendRegister(uint8_t reg,uint8_t data);
void setupPLL(uint8_t pll, uint8_t mult, uint32_t num, uint32_t denom);
void setupMultisynth(uint8_t synth, uint32_t divider, uint8_t rDiv);
//void si5351aOutputOff(uint8_t clk);
void si5351aSetFrequency(uint8_t td,uint32_t frequency);

void LCD_en_write(void);//液晶使能
void LCD_by(uchar abc);//写字节
void LCD_set_xy(uchar x, uchar y);//写地址
void LCD_write_str(uchar X,uchar Y,uchar *s);//写字符串
void LCD_init(void);//液晶初始化
void delay_nus(uint n);
void del_ms(uint n);
void delay_us(unsigned  int n);
void process_8(unsigned long i,unsigned char *p);
void display_8(unsigned char x, unsigned char y, unsigned char *p);

/*8位数预处理函数*/
void process_8(unsigned long i,unsigned char *p)
{
  p[0]=i/100000000%10;
  p[1]=i/10000000%10;
  p[2]=i/1000000%10;
  p[3]=i/100000%10;
  p[4]=i/10000%10;
  p[5]=i/1000%10;
  p[6]=i/100%10;
  p[7]=i/10%10;
  p[8]=i%10;
}
/*8位数显示函数*/
void display_8(unsigned char x, unsigned char y, unsigned char *p)
{
  unsigned char i;
  LCD_set_xy( x, y );
  RS_1;          //RS=1,写显示内容
  for(i=0;i<9;i++)//8
  {
if(i==3)
   {
      LCD_write_str(3,0,".");
   }
if(i==6)
   {
      LCD_write_str(7,0,".");
   }
      LCD_by(Table[p[ i]]);
  }
}

void LCD_en_write(void)
{
   delay_us(5);
   EN_1;
   delay_us(5);
   EN_0;
}
//---------------------------------------
void LCD_by(uchar abc)//写字节
{
delay_nus(500);//500
if(((abc<<0)&0x80)==0)
   LCD_D7_0;
   else LCD_D7_1;
if(((abc<<1)&0x80)==0)
   LCD_D6_0;
   else LCD_D6_1;
if(((abc<<2)&0x80)==0)
   LCD_D5_0;
   else LCD_D5_1;
if(((abc<<3)&0x80)==0)
   LCD_D4_0;
   else LCD_D4_1;
LCD_en_write();

if(((abc<<4)&0x80)==0)
   LCD_D7_0;
   else LCD_D7_1;
if(((abc<<5)&0x80)==0)
   LCD_D6_0;
   else LCD_D6_1;
if(((abc<<6)&0x80)==0)
   LCD_D5_0;
   else LCD_D5_1;
if(((abc<<7)&0x80)==0)
   LCD_D4_0;
   else LCD_D4_1;
LCD_en_write();
}
//----------------------------------------------
void LCD_set_xy( uchar x, uchar y )//写地址函数
  {
uchar address;
if (y == 0) address = 0x80 + x;
else
address = 0xc0 + x;
RS_0;          //RS=0，写命令
LCD_by(address);
  }
//---------------------------------------------
void LCD_write_str(uchar X,uchar Y,uchar *s)//写字符串
  {
LCD_set_xy(X,Y);
RS_1;
while(*s)
{
   LCD_by(*s);
   s++;
}
  }
//------------------------------------
void LCD_init(void)    //液晶初始化
{
RS_0;          //写命令
del_ms(500);

LCD_by(0x30);
del_ms(60);
LCD_by(0x30);
del_ms(10);
LCD_by(0x30);
del_ms(10);
LCD_by(0x02);
del_ms(10);
LCD_by(0x28);       //4bit test显示模式设置(不检测忙信号)
del_ms(10);
LCD_by(0x08);       // 显示关闭
del_ms(10);
LCD_by(0x01);       // 显示清屏
del_ms(10);
LCD_by(0x06);       // 显示光标移动
del_ms(10);
LCD_by(0x0C);       // 显示开及光标设置
del_ms(100);
}
//----------------------------------------------
void delay_nus(uint n)    //N us延时函数
  {
uint i=0;
for (i=0;i<n;i++){;}
  }
//--------------------------------------
void del_ms(uint n)//ms延时函数
{ uchar j;
  while(n--)
  {for(j=0;j<125;j++);}
}
//-----------------------------
void delay_us(unsigned  int n)
{
if(n==0)
return ;
while (--n);
}
//---------Si5351----------------
void i2cSendRegister(uint8_t reg,uint8_t data)
  {
i2c_start();//启动
i2c_write(0xc0);//5351地址I2C_WRITE 0b11000000
i2c_write(reg);//存储地址
i2c_write(data);//一字节数据
i2c_stop();//停止
delay_ms(2);
  }

void setupPLL(uint8_t pll, uint8_t mult, uint32_t num, uint32_t denom)
{
uint32_t P1;                   // PLL config register P1
uint32_t P2;                   // PLL config register P2
uint32_t P3;                   // PLL config register P3

P1 = (uint32_t)(128 * ((float)num / (float)denom));
P1 = (uint32_t)(128 * (uint32_t)(mult) + P1 - 512);
P2 = (uint32_t)(128 * ((float)num / (float)denom));
P2 = (uint32_t)(128 * num - denom * P2);
P3 = denom;

i2cSendRegister(pll + 0, (P3 & 0x0000FF00) >> 8);
i2cSendRegister(pll + 1, (P3 & 0x000000FF));
i2cSendRegister(pll + 2, (P1 & 0x00030000) >> 16);
i2cSendRegister(pll + 3, (P1 & 0x0000FF00) >> 8);
i2cSendRegister(pll + 4, (P1 & 0x000000FF));
i2cSendRegister(pll + 5, ((P3 & 0x000F0000) >> 12) | ((P2 & 0x000F0000) >> 16));
i2cSendRegister(pll + 6, (P2 & 0x0000FF00) >> 8);
i2cSendRegister(pll + 7, (P2 & 0x000000FF));
}

void setupMultisynth(uint8_t synth, uint32_t divider, uint8_t rDiv)
{
uint32_t P1;                   // Synth config register P1
uint32_t P2;                   // Synth config register P2
uint32_t P3;                   // Synth config register P3

P1 = 128 * divider - 512;
P2 = 0;
P3 = 1;

i2cSendRegister(synth + 0, (P3 & 0x0000FF00) >> 8);
i2cSendRegister(synth + 1, (P3 & 0x000000FF));
i2cSendRegister(synth + 2, ((P1 & 0x00030000) >> 16) | rDiv);
i2cSendRegister(synth + 3, (P1 & 0x0000FF00) >> 8);
i2cSendRegister(synth + 4, (P1 & 0x000000FF));
i2cSendRegister(synth + 5, ((P3 & 0x000F0000) >> 12) | ((P2 & 0x000F0000) >> 16));
i2cSendRegister(synth + 6, (P2 & 0x0000FF00) >> 8);
i2cSendRegister(synth + 7, (P2 & 0x000000FF));
}

/* void si5351aOutputOff(uint8_t clk)
{
i2cSendRegister(clk, 0x80);
}  */

void si5351aSetFrequency(uint8_t td,uint32_t frequency)
{
uint32_t pllFreq;
uint32_t xtalFreq = XTAL_FREQ;
uint32_t l;
float f;
uint8_t mult;
uint32_t num;
uint32_t denom;
uint32_t divider;

uint8_t x;
uint8_t y;
uint8_t z;

if(td==1)//1通道
   {
      x=SI_SYNTH_MS_1;
      y=SI_CLK1_CONTROL;
      z=SI_CLK_SRC_PLL_B;
   }
if(td==2)//2通道
   {
      x=SI_SYNTH_MS_2;
      y=SI_CLK2_CONTROL;
      z=SI_CLK_SRC_PLL_A;
   }

divider = 900000000 / frequency;

if (divider % 2) divider--;

pllFreq = divider * frequency;

mult = pllFreq / xtalFreq;
l = pllFreq % xtalFreq;
f = l;
f *= 1048575;
f /= xtalFreq;
num = f;
denom = 1048575;

if(td==1)//1通道
   {
      setupPLL(SI_SYNTH_PLL_B, mult, num, denom);
   }
if(td==2)//2通道
   {
      setupPLL(SI_SYNTH_PLL_A, mult, num, denom);
   }

setupMultisynth(x, divider, SI_R_DIV_1);

i2cSendRegister(SI_PLL_RESET, 0xA0);

i2cSendRegister(y, 0x4F | z);
}

void main(void)
  {
signed long int bj_1=500000;
signed long int bj_2=500000;
uchar IC=1;
uchar ID=1;
bit ww=1;
bit ee=1;

DDRB=0XFF;
PORTB=0X00;
DDRC=0XFF;
PORTC=0X00;
DDRD=0XC0;
PORTD=0XFF;

del_ms(100);
i2c_init();
del_ms(100);
LCD_init();
del_ms(100);
LCD_write_str(13,0,"MHz");
LCD_write_str(0,1,"Bj=");
del_ms(100);

while(1)
   {
      if(ee==1)
      {
         si5351aSetFrequency(1,bj_1);
         si5351aSetFrequency(2,bj_2);
         ee=0;
      }
      if(PIND.2==0)//频率加
      {
         del_ms(2);
         if(PIND.2==0)
            {
            while(!PIND.2);
               if(ID==1)
                  {
                     if(IC==1){bj_1=bj_1+10;}
                     if(IC==2){bj_1=bj_1+100;}
                     if(IC==3){bj_1=bj_1+1000;}
                     if(IC==4){bj_1=bj_1+10000;}
                     if(IC==5){bj_1=bj_1+100000;}
                     if(IC==6){bj_1=bj_1+1000000;}
                     if(IC==7){bj_1=bj_1+10000000;}
                     if(bj_1>120000000)
                     {
                        bj_1=120000000;
                     }
                     process_8(bj_1,Data);
                     display_8(0,0,Data);
                  }

                  if(ID==2)
                  {
                     if(IC==1){bj_2=bj_2+10;}
                     if(IC==2){bj_2=bj_2+100;}
                     if(IC==3){bj_2=bj_2+1000;}
                     if(IC==4){bj_2=bj_2+10000;}
                     if(IC==5){bj_2=bj_2+100000;}
                     if(IC==6){bj_2=bj_2+1000000;}
                     if(IC==7){bj_2=bj_2+10000000;}
                     if(bj_2>120000000)
                        {
                        bj_2=120000000;
                        }
                     process_8(bj_2,Data);
                     display_8(0,0,Data);
                  }
               ww=1;
            }
      }
      if(PIND.3==0)//频率减
      {
         del_ms(2);
         if(PIND.3==0)
            {
            while(!PIND.3);
            if(ID==1)
            {
               if(IC==1){bj_1=bj_1-10;}
               if(IC==2){bj_1=bj_1-100;}
               if(IC==3){bj_1=bj_1-1000;}
               if(IC==4){bj_1=bj_1-10000;}
               if(IC==5){bj_1=bj_1-100000;}
               if(IC==6){bj_1=bj_1-1000000;}
               if(IC==7){bj_1=bj_1-10000000;}
               if(bj_1<500000)
                  {
                  bj_1=500000;
                  }
               process_8(bj_1,Data);
               display_8(0,0,Data);
            }
            if(ID==2)
            {
               if(IC==1){bj_2=bj_2-10;}
               if(IC==2){bj_2=bj_2-100;}
               if(IC==3){bj_2=bj_2-1000;}
               if(IC==4){bj_2=bj_2-10000;}
               if(IC==5){bj_2=bj_2-100000;}
               if(IC==6){bj_2=bj_2-1000000;}
               if(IC==7){bj_2=bj_2-10000000;}
               if(bj_2<500000)
                  {
                  bj_2=500000;
                  }
               process_8(bj_2,Data);
               display_8(0,0,Data);
            }
               ww=1;
            }
      }

      if(PIND.4==0)//通道按下
      {
      del_ms(20);
      if(Td==0)
         {
            while(!Td);
            ID++;
            if(ID>2)
            {
               ID=1;
            }
            ww=1;
         }
      }
      switch(ID)
      {
         case 1:
         if(ww==1)
            {
            si5351aSetFrequency(1,bj_1);
            LCD_write_str(14,1,"1");
            process_8(bj_1,Data);
            display_8(0,0,Data);
            ww=0;
            }
         break;

         case 2:
         if(ww==1)
            {
            si5351aSetFrequency(2,bj_2);
            LCD_write_str(14,1,"2");
            process_8(bj_2,Data);
            display_8(0,0,Data);
            ww=0;
            }
         break;
      }

      if(PIND.0==0)//步进按下
      {
      del_ms(20);
      if(PIND.0==0)
         {
            while(!PIND.0);
            IC++;
            if(IC>7)
            {
               IC=1;
            }
            ww=1;
         }
      }
   switch(IC)
      {
         case 1://10HZ
         LCD_write_str(3,1,"10Hz  ");//
         break;

         case 2://100HZ
         LCD_write_str(3,1,"100Hz ");//
         break;

         case 3://1KHZ
         LCD_write_str(3,1,"1KHz  ");//
         break;

         case 4://10KHZ
         LCD_write_str(3,1,"10KHz ");//
         break;

         case 5://100KHZ
         LCD_write_str(3,1,"100KHz");//
         break;

         case 6://1MHZ
         LCD_write_str(3,1,"1MHz  ");//
         break;

         case 7://10MHZ
         LCD_write_str(3,1,"10MHz ");//
         break;
      }
   }
  }

SI5351信号发生器.pdf (211.42 KB, 下载次数: 0)

ID:1136941 · 发表于 2025-1-13 16:14

ID:1095428 · 发表于 2025-3-10 22:51

老师你好， DE BA7LNN，谢谢，73!

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ATMEGA8单片机+SI5351双通道高频信号发生器

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