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Si5351时钟芯片控制

发布时间 2023-07-21 09:00:28作者: SymPny

Si5351

一、SI5351频率计算公式：

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     f(out) = f(pll) / M(x)R(x) 
    
   
 </span><span class="katex-html"><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.10764em;">f</span><span class="mopen">(</span><span class="mord mathdefault">o</span><span class="mord mathdefault">u</span><span class="mord mathdefault">t</span><span class="mclose">)</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.10764em;">f</span><span class="mopen">(</span><span class="mord mathdefault">p</span><span class="mord mathdefault" style="margin-right: 0.01968em;">l</span><span class="mord mathdefault" style="margin-right: 0.01968em;">l</span><span class="mclose">)</span><span class="mord">/</span><span class="mord mathdefault" style="margin-right: 0.10903em;">M</span><span class="mopen">(</span><span class="mord mathdefault">x</span><span class="mclose">)</span><span class="mord mathdefault" style="margin-right: 0.00773em;">R</span><span class="mopen">(</span><span class="mord mathdefault">x</span><span class="mclose">)</span></span></span></span></span></span></p>
1、小于150Mhz

先设置PLL的频率

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     f(pll) = f(晶振频率)(a + b/c) 
    
   
 </span><span class="katex-html"><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.10764em;">f</span><span class="mopen">(</span><span class="mord mathdefault">p</span><span class="mord mathdefault" style="margin-right: 0.01968em;">l</span><span class="mord mathdefault" style="margin-right: 0.01968em;">l</span><span class="mclose">)</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.10764em;">f</span><span class="mopen">(</span><span class="mord cjk_fallback">晶</span><span class="mord cjk_fallback">振</span><span class="mord cjk_fallback">频</span><span class="mord cjk_fallback">率</span><span class="mclose">)</span><span class="mopen">(</span><span class="mord mathdefault">a</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">+</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault">b</span><span class="mord">/</span><span class="mord mathdefault">c</span><span class="mclose">)</span></span></span></span></span></span></p>

a+b/c的范围 （15 + 0/1048575, 90)

a、b、c的设置方法参照文档设置MSNx_P1[17:0]、MSNx_P2[19:0]、MSNx_P3[19:0]寄存器
MSNA_P1[17:0]、MSNA_P2[19:0]、MSNA_P3[19:0]

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      512 
     
    
   
     MSNA_P1[17:0] = 128 *a+Floor(128* b/c) - 512 
    
   
 </span><span class="katex-html"><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.10903em;">M</span><span class="mord mathdefault" style="margin-right: 0.05764em;">S</span><span class="mord mathdefault" style="margin-right: 0.10903em;">N</span><span class="mord"><span class="mord mathdefault">A</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height: 0.328331em;"><span class="" style="top: -2.55em; margin-left: 0em; margin-right: 0.05em;"><span class="pstrut" style="height: 2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight" style="margin-right: 0.13889em;">P</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height: 0.15em;"><span class=""></span></span></span></span></span></span><span class="mord">1</span><span class="mopen">[</span><span class="mord">1</span><span class="mord">7</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">:</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord">0</span><span class="mclose">]</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 0.64444em; vertical-align: 0em;"></span><span class="mord">1</span><span class="mord">2</span><span class="mord">8</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">∗</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 0.66666em; vertical-align: -0.08333em;"></span><span class="mord mathdefault">a</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">+</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.13889em;">F</span><span class="mord mathdefault" style="margin-right: 0.01968em;">l</span><span class="mord mathdefault">o</span><span class="mord mathdefault">o</span><span class="mord mathdefault" style="margin-right: 0.02778em;">r</span><span class="mopen">(</span><span class="mord">1</span><span class="mord">2</span><span class="mord">8</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">∗</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault">b</span><span class="mord">/</span><span class="mord mathdefault">c</span><span class="mclose">)</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 0.64444em; vertical-align: 0em;"></span><span class="mord">5</span><span class="mord">1</span><span class="mord">2</span></span></span></span></span></span></p> 


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     MSNA_P2[19:0] = 128*b - c*Floor(128* b/c) 
    
   
 </span><span class="katex-html"><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.10903em;">M</span><span class="mord mathdefault" style="margin-right: 0.05764em;">S</span><span class="mord mathdefault" style="margin-right: 0.10903em;">N</span><span class="mord"><span class="mord mathdefault">A</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height: 0.328331em;"><span class="" style="top: -2.55em; margin-left: 0em; margin-right: 0.05em;"><span class="pstrut" style="height: 2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight" style="margin-right: 0.13889em;">P</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height: 0.15em;"><span class=""></span></span></span></span></span></span><span class="mord">2</span><span class="mopen">[</span><span class="mord">1</span><span class="mord">9</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">:</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord">0</span><span class="mclose">]</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 0.64444em; vertical-align: 0em;"></span><span class="mord">1</span><span class="mord">2</span><span class="mord">8</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">∗</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 0.77777em; vertical-align: -0.08333em;"></span><span class="mord mathdefault">b</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 0.46528em; vertical-align: 0em;"></span><span class="mord mathdefault">c</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">∗</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.13889em;">F</span><span class="mord mathdefault" style="margin-right: 0.01968em;">l</span><span class="mord mathdefault">o</span><span class="mord mathdefault">o</span><span class="mord mathdefault" style="margin-right: 0.02778em;">r</span><span class="mopen">(</span><span class="mord">1</span><span class="mord">2</span><span class="mord">8</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">∗</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault">b</span><span class="mord">/</span><span class="mord mathdefault">c</span><span class="mclose">)</span></span></span></span></span></span></p> 


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     MSNA_P3[19:0] = c 
    
   
 </span><span class="katex-html"><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.10903em;">M</span><span class="mord mathdefault" style="margin-right: 0.05764em;">S</span><span class="mord mathdefault" style="margin-right: 0.10903em;">N</span><span class="mord"><span class="mord mathdefault">A</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height: 0.328331em;"><span class="" style="top: -2.55em; margin-left: 0em; margin-right: 0.05em;"><span class="pstrut" style="height: 2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight" style="margin-right: 0.13889em;">P</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height: 0.15em;"><span class=""></span></span></span></span></span></span><span class="mord">3</span><span class="mopen">[</span><span class="mord">1</span><span class="mord">9</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">:</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord">0</span><span class="mclose">]</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 0.43056em; vertical-align: 0em;"></span><span class="mord mathdefault">c</span></span></span></span></span></span></p>

再设置Multisynth分频设置寄存器MSx_P1[17:0]、MSx_P2[19:0]、MSx_P3[19:0]

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     MSA_P1[17:0] = 128 *a+Floor(128* b/c) - 512 
    
   
 </span><span class="katex-html"><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.10903em;">M</span><span class="mord mathdefault" style="margin-right: 0.05764em;">S</span><span class="mord"><span class="mord mathdefault">A</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height: 0.328331em;"><span class="" style="top: -2.55em; margin-left: 0em; margin-right: 0.05em;"><span class="pstrut" style="height: 2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight" style="margin-right: 0.13889em;">P</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height: 0.15em;"><span class=""></span></span></span></span></span></span><span class="mord">1</span><span class="mopen">[</span><span class="mord">1</span><span class="mord">7</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">:</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord">0</span><span class="mclose">]</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 0.64444em; vertical-align: 0em;"></span><span class="mord">1</span><span class="mord">2</span><span class="mord">8</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">∗</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 0.66666em; vertical-align: -0.08333em;"></span><span class="mord mathdefault">a</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">+</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.13889em;">F</span><span class="mord mathdefault" style="margin-right: 0.01968em;">l</span><span class="mord mathdefault">o</span><span class="mord mathdefault">o</span><span class="mord mathdefault" style="margin-right: 0.02778em;">r</span><span class="mopen">(</span><span class="mord">1</span><span class="mord">2</span><span class="mord">8</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">∗</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault">b</span><span class="mord">/</span><span class="mord mathdefault">c</span><span class="mclose">)</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 0.64444em; vertical-align: 0em;"></span><span class="mord">5</span><span class="mord">1</span><span class="mord">2</span></span></span></span></span></span></p> 


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     MSA_P2[19:0] = 128*b - c*Floor(128* b/c) 
    
   
 </span><span class="katex-html"><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.10903em;">M</span><span class="mord mathdefault" style="margin-right: 0.05764em;">S</span><span class="mord"><span class="mord mathdefault">A</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height: 0.328331em;"><span class="" style="top: -2.55em; margin-left: 0em; margin-right: 0.05em;"><span class="pstrut" style="height: 2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight" style="margin-right: 0.13889em;">P</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height: 0.15em;"><span class=""></span></span></span></span></span></span><span class="mord">2</span><span class="mopen">[</span><span class="mord">1</span><span class="mord">9</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">:</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord">0</span><span class="mclose">]</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 0.64444em; vertical-align: 0em;"></span><span class="mord">1</span><span class="mord">2</span><span class="mord">8</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">∗</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 0.77777em; vertical-align: -0.08333em;"></span><span class="mord mathdefault">b</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 0.46528em; vertical-align: 0em;"></span><span class="mord mathdefault">c</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">∗</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.13889em;">F</span><span class="mord mathdefault" style="margin-right: 0.01968em;">l</span><span class="mord mathdefault">o</span><span class="mord mathdefault">o</span><span class="mord mathdefault" style="margin-right: 0.02778em;">r</span><span class="mopen">(</span><span class="mord">1</span><span class="mord">2</span><span class="mord">8</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">∗</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault">b</span><span class="mord">/</span><span class="mord mathdefault">c</span><span class="mclose">)</span></span></span></span></span></span></p> 


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      c 
     
    
   
     MSA_P3[19:0] = c 
    
   
 </span><span class="katex-html"><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.10903em;">M</span><span class="mord mathdefault" style="margin-right: 0.05764em;">S</span><span class="mord"><span class="mord mathdefault">A</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height: 0.328331em;"><span class="" style="top: -2.55em; margin-left: 0em; margin-right: 0.05em;"><span class="pstrut" style="height: 2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight" style="margin-right: 0.13889em;">P</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height: 0.15em;"><span class=""></span></span></span></span></span></span><span class="mord">3</span><span class="mopen">[</span><span class="mord">1</span><span class="mord">9</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">:</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord">0</span><span class="mclose">]</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 0.43056em; vertical-align: 0em;"></span><span class="mord mathdefault">c</span></span></span></span></span></span></p> 


      M 
     
    
      ( 
     
    
      x 
     
    
      ) 
     
    
      = 
     
    
      a 
     
    
      + 
     
    
      b 
     
    
      / 
     
    
      c 
     
    
   
     M(x) = a + b/c 
    
   
 </span><span class="katex-html"><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault" style="margin-right: 0.10903em;">M</span><span class="mopen">(</span><span class="mord mathdefault">x</span><span class="mclose">)</span><span class="mspace" style="margin-right: 0.277778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right: 0.277778em;"></span></span><span class="base"><span class="strut" style="height: 0.66666em; vertical-align: -0.08333em;"></span><span class="mord mathdefault">a</span><span class="mspace" style="margin-right: 0.222222em;"></span><span class="mbin">+</span><span class="mspace" style="margin-right: 0.222222em;"></span></span><span class="base"><span class="strut" style="height: 1em; vertical-align: -0.25em;"></span><span class="mord mathdefault">b</span><span class="mord">/</span><span class="mord mathdefault">c</span></span></span></span></span></span></p>

M(x)的范围（8 + 1/1048575, 2048)

二、驱动SI5351：

SI5351时钟芯片，通过I2C区控制，SI5351地址在Silabs-Si5351A.pdf文档上可以找到是：0xc0（写数据）0xc1（读数据）；

SI5351设置低频率：通过为Rx_DIV写入适当的设置将其设置为1，2，4，8，… 128。设置此参数可生成低至8kHz的频率；

SI5351使用晶体振荡器时要设置PLL_SRC、XTAL_CL脚；

PLL_SRC,0x00
XTAL_CL,0x80

1、I2C程序

uint32_t I2C_Timeout;
 /** 
      PB6  -------> I2C1 SCL
      PB7  -------> I2C1 SDA
  **/
void GPIO_Init_Config(void)
{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);


GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOB, &GPIO_InitStructure);


GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_1);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_1);

}


void I2C1_Init_Config(void)

{

I2C_InitTypeDef I2C_InitStructure;

I2CMaster_RCC_Configuration();

RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);

RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);

GPIO_Init_Config();

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);


RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);


RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);


I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;

I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;

I2C_InitStructure.I2C_DigitalFilter = 0x01;

I2C_InitStructure.I2C_OwnAddress1 = 0x00;

I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;

I2C_InitStructure.I2C_Timing = 0x30E32E44;

I2C_Init(I2C1, &I2C_InitStructure);


I2C_Cmd(I2C1, ENABLE);

I2CMaster_NVIC_Configuration();

//I2C_ITConfig();

}


void I2CMaster_RCC_Configuration(void)

{

/* Enable peripheral clocks --------------------------------------------------*/

RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);


}


void I2CMaster_NVIC_Configuration(void)

{

NVIC_InitTypeDef NVIC_InitStructure;


NVIC_InitStructure<span class="token punctuation">.</span>NVIC_IRQChannel <span class="token operator">=</span> I2C1_IRQn<span class="token punctuation">;</span>
NVIC_InitStructure<span class="token punctuation">.</span>NVIC_IRQChannelCmd <span class="token operator">=</span> ENABLE<span class="token punctuation">;</span> 
NVIC_InitStructure<span class="token punctuation">.</span>NVIC_IRQChannelPriority <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token function">NVIC_Init</span><span class="token punctuation">(</span><span class="token operator">&amp;</span>NVIC_InitStructure<span class="token punctuation">)</span><span class="token punctuation">;</span>



}


I2C_Status I2C_Read_NBytes(uint8_t driver_Addr, uint8_t number_Bytes, uint8_t *read_Buffer)

{

uint8_t read_Num;


I2C_Timeout = I2C_TIMEOUT;

while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY) != RESET)

{

if((I2C_Timeout--) == 0)

{

return I2C_FAIL;

}

}


I2C_TransferHandling(I2C1, driver_Addr, 1, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);


I2C_Timeout = I2C_TIMEOUT;

while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXIS)  RESET)

{

if((I2C_Timeout--)  0)

{

return I2C_FAIL;

}

}


I2C_SendData(I2C1, 0Xc0);


I2C_Timeout = I2C_TIMEOUT;

while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TC)  RESET)

{

if((I2C_Timeout--)  0)

{

return I2C_FAIL;

}

}


I2C_TransferHandling(I2C1, driver_Addr, number_Bytes,  I2C_AutoEnd_Mode, I2C_Generate_Start_Read);


for(read_Num = 0; read_Num < number_Bytes; read_Num++)

{

I2C_Timeout = I2C_TIMEOUT;

while(I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE)  RESET)

{

if((I2C_Timeout--)  0)

{

return I2C_FAIL;

}

}


read_Buffer<span class="token punctuation">[</span>read_Num<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">I2C_ReceiveData</span><span class="token punctuation">(</span>I2C1<span class="token punctuation">)</span><span class="token punctuation">;</span>



}


I2C_Timeout = I2C_TIMEOUT;

while(I2C_GetFlagStatus(I2C1, I2C_FLAG_STOPF)  RESET)

{

if((I2C_Timeout--)  0)

{

return I2C_FAIL;

}

}


return I2C_OK;

}


I2C_Status I2C_Write_NBytes(uint8_t start_Addr, uint8_t write_Buffer)

{

uint8_t write_Num;

uint8_t number_Bytes = 1;

I2C_Timeout = I2C_TIMEOUT;

while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY) != RESET)

{

if((I2C_Timeout--) == 0)

{

return I2C_FAIL;

}

}


I2C_TransferHandling(I2C1, 0xC0, 1, I2C_Reload_Mode, I2C_Generate_Start_Write);


I2C_Timeout = I2C_TIMEOUT;

while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXIS)  RESET)

{

if((I2C_Timeout--)  0)

{

return I2C_FAIL;

}

}


I2C_SendData(I2C1, start_Addr);


I2C_Timeout = I2C_TIMEOUT;

while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TCR)  RESET)

{

if((I2C_Timeout--)  0)

{

return I2C_FAIL;

}

}


I2C_TransferHandling(I2C1, 0xC0, number_Bytes, I2C_AutoEnd_Mode, I2C_No_StartStop);


for(write_Num = 0; write_Num < number_Bytes; write_Num++)

{

I2C_Timeout = I2C_TIMEOUT;

while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXIS)  RESET)

{

if((I2C_Timeout--)  0)

{

return I2C_FAIL;

}

}


<span class="token function">I2C_SendData</span><span class="token punctuation">(</span>I2C1<span class="token punctuation">,</span> write_Buffer<span class="token punctuation">)</span><span class="token punctuation">;</span>



}


I2C_Timeout = I2C_TIMEOUT;

while(I2C_GetFlagStatus(I2C1, I2C_FLAG_STOPF)  RESET)

{

if((I2C_Timeout--)  0)

{

return I2C_FAIL;

}

}


return I2C_OK;

}


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2、Si5351程序

//设置PPL时钟

// 参数： pll寄存器  mult a  num b  denom c

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 <span class="token operator">=</span> <span class="token punctuation">(</span>uint32_t<span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token number">128</span> <span class="token operator">*</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token keyword">float</span><span class="token punctuation">)</span>num <span class="token operator">/</span> <span class="token punctuation">(</span><span class="token keyword">float</span><span class="token punctuation">)</span>denom<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
P1 <span class="token operator">=</span> <span class="token punctuation">(</span>uint32_t<span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token number">128</span> <span class="token operator">*</span> <span class="token punctuation">(</span>uint32_t<span class="token punctuation">)</span><span class="token punctuation">(</span>mult<span class="token punctuation">)</span> <span class="token operator">+</span> P1 <span class="token operator">-</span> <span class="token number">512</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
P2 <span class="token operator">=</span> <span class="token punctuation">(</span>uint32_t<span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token number">128</span> <span class="token operator">*</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token keyword">float</span><span class="token punctuation">)</span>num <span class="token operator">/</span> <span class="token punctuation">(</span><span class="token keyword">float</span><span class="token punctuation">)</span>denom<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
P2 <span class="token operator">=</span> <span class="token punctuation">(</span>uint32_t<span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token number">128</span> <span class="token operator">*</span> num <span class="token operator">-</span> denom <span class="token operator">*</span> P2<span class="token punctuation">)</span><span class="token punctuation">;</span>
P3 <span class="token operator">=</span> denom<span class="token punctuation">;</span>

<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>pll <span class="token operator">+</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>P3 <span class="token operator">&gt;&gt;</span> <span class="token number">8</span><span class="token punctuation">)</span><span class="token operator">&amp;</span> <span class="token number">0xFF</span><span class="token punctuation">)</span><span class="token punctuation">;</span>    	<span class="token comment">//MSN_P3[15:8]											</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>pll <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>P3 <span class="token operator">&amp;</span> <span class="token number">0xFF</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>			<span class="token comment">//MSN_P3[7:0]	 												</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>pll <span class="token operator">+</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>P1 <span class="token operator">&gt;&gt;</span> <span class="token number">16</span><span class="token punctuation">)</span><span class="token operator">&amp;</span> <span class="token number">0x03</span><span class="token punctuation">)</span><span class="token punctuation">;</span>   	<span class="token comment">//MSN_P1[17:16]											</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>pll <span class="token operator">+</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>P1 <span class="token operator">&gt;&gt;</span> <span class="token number">8</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span> <span class="token number">0xFF</span><span class="token punctuation">)</span><span class="token punctuation">;</span>   	<span class="token comment">//MSN_P1[15:8]											</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>pll <span class="token operator">+</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>P1 <span class="token operator">&amp;</span> <span class="token number">0xFF</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>			<span class="token comment">//MSN_P1[7:0]	 							</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>pll <span class="token operator">+</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>P3 <span class="token operator">&gt;&gt;</span> <span class="token number">12</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span> <span class="token number">0xF0</span><span class="token punctuation">)</span> <span class="token operator">|</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>P2 <span class="token operator">&gt;&gt;</span> <span class="token number">16</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span> <span class="token number">0x0F</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//MSN_P3[19:16] + MSN_P2[19:16]</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>pll <span class="token operator">+</span> <span class="token number">6</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>P2 <span class="token operator">&gt;&gt;</span> <span class="token number">8</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span> <span class="token number">0xFF</span><span class="token punctuation">)</span><span class="token punctuation">;</span>	<span class="token comment">//MSN_P2[15:8]												</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>pll <span class="token operator">+</span> <span class="token number">7</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>P2 <span class="token operator">&amp;</span> <span class="token number">0xFF</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>				 												<span class="token comment">//MSN_P2[7:0]</span>



}


void Multisynth(uint8_t synth, uint8_t a, uint32_t b, uint32_t c, 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 <span class="token operator">=</span> <span class="token punctuation">(</span>uint32_t<span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token number">128</span> <span class="token operator">*</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token keyword">float</span><span class="token punctuation">)</span>b <span class="token operator">/</span> <span class="token punctuation">(</span><span class="token keyword">float</span><span class="token punctuation">)</span>c<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
P1 <span class="token operator">=</span> <span class="token punctuation">(</span>uint32_t<span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token number">128</span> <span class="token operator">*</span> <span class="token punctuation">(</span>uint32_t<span class="token punctuation">)</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span> <span class="token operator">+</span> P1 <span class="token operator">-</span> <span class="token number">512</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
P2 <span class="token operator">=</span> <span class="token punctuation">(</span>uint32_t<span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token number">128</span> <span class="token operator">*</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token keyword">float</span><span class="token punctuation">)</span>b <span class="token operator">/</span> <span class="token punctuation">(</span><span class="token keyword">float</span><span class="token punctuation">)</span>c<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
P2 <span class="token operator">=</span> <span class="token punctuation">(</span>uint32_t<span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token number">128</span> <span class="token operator">*</span> b <span class="token operator">-</span> c <span class="token operator">*</span> P2<span class="token punctuation">)</span><span class="token punctuation">;</span>
P3 <span class="token operator">=</span> c<span class="token punctuation">;</span>

<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>synth <span class="token operator">+</span> <span class="token number">0</span><span class="token punctuation">,</span>   <span class="token punctuation">(</span>P3 <span class="token operator">&gt;&gt;</span> <span class="token number">8</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span> <span class="token number">0xFF</span><span class="token punctuation">)</span><span class="token punctuation">;</span>   <span class="token comment">//MS_P3[15:8]                       </span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>synth <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">,</span>   <span class="token punctuation">(</span>P3 <span class="token operator">&amp;</span> <span class="token number">0xFF</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>		   <span class="token comment">//MS_P3[7:0]														</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>synth <span class="token operator">+</span> <span class="token number">2</span><span class="token punctuation">,</span>   <span class="token punctuation">(</span><span class="token punctuation">(</span>P1 <span class="token operator">&gt;&gt;</span> <span class="token number">16</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span> <span class="token number">0x03</span><span class="token punctuation">)</span> <span class="token operator">|</span> rDiv<span class="token punctuation">)</span><span class="token punctuation">;</span>	<span class="token comment">//MS_P1[17:16]							</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>synth <span class="token operator">+</span> <span class="token number">3</span><span class="token punctuation">,</span>   <span class="token punctuation">(</span>P1 <span class="token operator">&gt;&gt;</span> <span class="token number">8</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span> <span class="token number">0xFF</span><span class="token punctuation">)</span><span class="token punctuation">;</span>   <span class="token comment">//MS_P1[15:8]												</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>synth <span class="token operator">+</span> <span class="token number">4</span><span class="token punctuation">,</span>   <span class="token punctuation">(</span>P1 <span class="token operator">&amp;</span> <span class="token number">0xFF</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>		   <span class="token comment">//MS_P1[7:0]													</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>synth <span class="token operator">+</span> <span class="token number">5</span><span class="token punctuation">,</span>   <span class="token punctuation">(</span><span class="token punctuation">(</span>P3 <span class="token operator">&gt;&gt;</span> <span class="token number">12</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span> <span class="token number">0xF0</span><span class="token punctuation">)</span> <span class="token operator">|</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>P2 <span class="token operator">&gt;&gt;</span> <span class="token number">16</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span> <span class="token number">0x0F</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//MS_P3[19:16] + MS_P2[19:16]</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>synth <span class="token operator">+</span> <span class="token number">6</span><span class="token punctuation">,</span>   <span class="token punctuation">(</span>P2 <span class="token operator">&gt;&gt;</span> <span class="token number">8</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span> <span class="token number">0xFF</span><span class="token punctuation">)</span><span class="token punctuation">;</span>	<span class="token comment">//MS_P2[15:8]												</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>synth <span class="token operator">+</span> <span class="token number">7</span><span class="token punctuation">,</span>   <span class="token punctuation">(</span>P2 <span class="token operator">&amp;</span> <span class="token number">0xFF</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>			<span class="token comment">//MS_P2[7:0]													</span>



}


//设置时钟频率

void si5351aSetFrequency(uint32_t frequency , uint8_t Chanal )

{


<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>PLL_SRC<span class="token punctuation">,</span><span class="token number">0x00</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>XTAL_CL<span class="token punctuation">,</span><span class="token number">0x80</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token keyword">if</span> <span class="token punctuation">(</span> Chanal <span class="token operator">==</span> <span class="token number">1</span> <span class="token punctuation">)</span><span class="token punctuation">{<!-- --></span>
	<span class="token comment">//I2C_Write_NBytes(FBB_INT , 0x40);       //整数模式</span>
	<span class="token function">setupPLL</span><span class="token punctuation">(</span>SI_SYNTH_PLL_B<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">;</span>				<span class="token comment">//设置锁相环与倍增系数计算</span>
	<span class="token function">Multisynth</span><span class="token punctuation">(</span>SI_SYNTH_MS_1<span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> <span class="token number">1036</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">,</span> SI_R_DIV_32<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>SI_PLL_RESET<span class="token punctuation">,</span><span class="token number">0xA0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>	
	<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>SI_CLK1_CONTROL<span class="token punctuation">,</span> <span class="token number">0x4F</span><span class="token operator">|</span>SI_CLK_SRC_PLL_B<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>frequency <span class="token operator">==</span> Fre_45M<span class="token punctuation">)</span>
<span class="token punctuation">{<!-- --></span>
	<span class="token keyword">if</span><span class="token punctuation">(</span> Chanal <span class="token operator">==</span> <span class="token number">0</span> <span class="token punctuation">)</span>
	<span class="token punctuation">{<!-- --></span>
		<span class="token function">setupPLL</span><span class="token punctuation">(</span>SI_SYNTH_PLL_A<span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">;</span>					 				     <span class="token comment">//设置锁相环与倍增系数计算</span>
		<span class="token function">Multisynth</span><span class="token punctuation">(</span>SI_SYNTH_MS_0<span class="token punctuation">,</span> <span class="token number">12</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">,</span> SI_R_DIV_1<span class="token punctuation">)</span><span class="token punctuation">;</span> 	       <span class="token comment">//设置MultiSynth分配器0分计算。最后R分裂阶段可以除以2的幂,从1 . . 128。如果想在1兆赫兹以下输出,你必须使用,最后R分裂阶段</span>
		<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>SI_PLL_RESET<span class="token punctuation">,</span><span class="token number">0xA0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>							 				 <span class="token comment">//重置锁相环。这将导致输出的故障。对于小的变化参数,不需要复位锁相环,没有故障	</span>
		<span class="token function">I2C_Write_NBytes</span><span class="token punctuation">(</span>SI_CLK0_CONTROL<span class="token punctuation">,</span> <span class="token number">0x4F</span><span class="token operator">|</span>SI_CLK_SRC_PLL_A<span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">//最后打开CLK0输出(0 x4f)并设置MultiSynth0是锁相环的输入	</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>



}


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