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📁 Atmel AT91SAM7S Interrupt example code
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<title>AT91 SAM7S Interrupt Management Version: 2.0</title>
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<div class=Section1> 
  <p class=MsoNormal align=right style='text-align:right'><!-- ******* title  ********** !--><b><span
lang=EN-US style='mso-ansi-language:EN-US'>Version: 2.0</span></b><span
lang=EN-US style='mso-ansi-language:EN-US'><o:p></o:p></span></p>
  <p align=center style='text-align:center'><b><span lang=EN-US style='font-family:
Georgia;mso-ansi-language:EN-US'>AT91 SAM7S Interrupt Management</span></b><span
lang=EN-US style='mso-ansi-language:EN-US'><o:p></o:p></span></p>
  <p><span lang=EN-US style='mso-ansi-language:EN-US'><!-- ******* Introduction  ********** !-->The 
    goal of this demonstration project is to demonstrate how to use the AT91 ARM-Based 
    Software Package. This project runs a test of the <b>AT91SAM7S</b> device 
    and his corresponding Evaluation Kit, the <b>AT91SAM7S-EK. </b> <br>
    This project implements an interrupt management example.<o:p></o:p></span><span lang=EN-US style='mso-ansi-language:EN-US'><o:p> 
    <br>
    </o:p></span></p>
  <p class=MsoNormal><!-- ******* Reference  ********** !--><b><span lang=EN-US
style='mso-ansi-language:EN-US'>Reference Documents<o:p></o:p></span></b></p>
  <table border=1 cellspacing=1 cellpadding=0 width=400 style='width:300.0pt;
 mso-cellspacing:.7pt;margin-left:36.0pt;mso-padding-alt:5.25pt 5.25pt 5.25pt 5.25pt'>
    <tr> 
      <td width="66%" valign=top style='width:66.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'> 
        <p class=MsoNormal><span lang=EN-US style='mso-ansi-language:EN-US'>Name<o:p></o:p></span></p>
      </td>
      <td width="34%" valign=top style='width:34.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'> 
        <p><span lang=EN-US style='font-size:10.0pt;mso-ansi-language:EN-US'>Reference</span><span
  lang=EN-US style='mso-ansi-language:EN-US'><o:p></o:p></span></p>
      </td>
    </tr>
    <tr> 
      <td width="66%" valign=top style='width:66.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'> 
        <p><span lang=EN-US style='font-size:10.0pt;mso-ansi-language:EN-US'>ARM-Based 
          Software Package</span><span lang=EN-US style='mso-ansi-language:EN-US'><o:p></o:p></span></p>
      </td>
      <td width="34%" valign=top style='width:34.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'> 
        <p><span lang=EN-US style='font-size:10.0pt;mso-ansi-language:EN-US'>6016</span><span
  lang=EN-US style='mso-ansi-language:EN-US'><o:p></o:p></span></p>
      </td>
    </tr>
    <tr> 
      <td width="66%" valign=top style='width:66.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'> 
        <p class=MsoNormal><span lang=EN-US style='mso-ansi-language:EN-US'>AT91SAM7Sxx 
          Datasheet<o:p></o:p></span></p>
      </td>
      <td width="34%" valign=top style='width:34.0%;padding:5.25pt 5.25pt 5.25pt 5.25pt'> 
        <p><span lang=EN-US style='font-size:10.0pt;mso-ansi-language:EN-US'>6070</span><span
  lang=EN-US style='mso-ansi-language:EN-US'><o:p></o:p></span></p>
      </td>
    </tr>
  </table>
  <br>
  <p class=MsoNormal><!-- ******* Contents  ********** !--><b><span lang=EN-US
style='mso-ansi-language:EN-US'>Contents:<o:p></o:p></span></b></p>
  <p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US
style='mso-ansi-language:EN-US'><a href="#Hardware_resource">Hardware resource</a> 
    <o:p></o:p></span></p>
  <p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US
style='mso-ansi-language:EN-US'><a href="#Source_Files">Source Files</a> <o:p></o:p></span></p>
  <p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US
style='mso-ansi-language:EN-US'><a href="#Description">Description</a><o:p></o:p></span></p>
  <p class=MsoNormal style='margin-left:72.0pt'><span lang=EN-US
style='mso-ansi-language:EN-US'><a href="#Interrupt_Action">Interrupt Action</a><o:p></o:p></span></p>
  <p class=MsoNormal style='margin-left:72.0pt'><span lang=EN-US
style='mso-ansi-language:EN-US'><a href="#Interrupt_Implementation">Interrupt 
    Implementation</a><o:p></o:p></span></p>
  <p class=MsoNormal style='margin-left:72.0pt'><span lang=EN-US
style='mso-ansi-language:EN-US'><a href="#Interrupt_Level">Interrupt level description</a><o:p></o:p></span></p>
  <p class=MsoNormal><!-- ******* Hardware resource  ********** !--><a
name="Hardware_resource"><b><span lang=EN-US style='mso-ansi-language:EN-US'><![if !supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></b></a></p>
  <p class=MsoNormal><span style='mso-bookmark:Hardware_resource'><b><span
lang=EN-US style='mso-ansi-language:EN-US'>Hardware resource:</span></b></span><b><span
lang=EN-US style='mso-ansi-language:EN-US'><o:p><br>
    <br>
    </o:p></span></b></p>
  <p class=MsoNormal style='text-indent:36.0pt'><a name=AT91><b><span lang=EN-US
style='mso-ansi-language:EN-US'>AT91SAM7S product</span></b></a><b><span
lang=EN-US style='mso-ansi-language:EN-US'><o:p></o:p></span></b></p>
  <p class=MsoNormal style='margin-left:36.0pt;text-indent:36.0pt'><b><span
lang=EN-US style='mso-ansi-language:EN-US'>- USART :<a
href="#Usart_Configuration"><span style='font-weight:normal'> Usart 0 </span></a></span></b><span
class=MsoHyperlink><span lang=EN-US style='mso-ansi-language:EN-US'><o:p></o:p></span></span></p>
  <p class=MsoNormal style='margin-left:36.0pt;text-indent:36.0pt'><b><span
lang=EN-US style='mso-ansi-language:EN-US'>- Timer :</span></b><span lang=EN-US
style='mso-ansi-language:EN-US'> Timer 0 &amp; Timer 1<o:p></o:p></span></p>
  <p class=MsoNormal style='margin-left:36.0pt;text-indent:36.0pt'><b><span
lang=FR style='mso-ansi-language:FR'>- IRQ :</span></b><span lang=FR
style='mso-ansi-language:FR'> IRQ0 &amp; FIQ external interrupt<o:p></o:p></span></p>
  <p class=MsoNormal style='margin-left:36.0pt;text-indent:36.0pt'><b><span
lang=EN-US style='mso-ansi-language:EN-US'>- PIO :</span></b><span lang=EN-US
style='mso-ansi-language:EN-US'> PIOA Controller<o:p></o:p></span></p>
  <p class=MsoNormal style='margin-left:36.0pt;text-indent:36.0pt'><b><span
lang=EN-US style='mso-ansi-language:EN-US'>- PMC :</span></b><span lang=EN-US
style='mso-ansi-language:EN-US'> Power management Controller<o:p></o:p></span></p>
  <p class=MsoNormal style='margin-left:36.0pt;text-indent:36.0pt'><b><span
lang=EN-US style='mso-ansi-language:EN-US'>- AIC :</span></b><span lang=EN-US
style='mso-ansi-language:EN-US'> Advanced Interrupt Controller<o:p><br>
    <br>
    </o:p></span></p>
  <p class=MsoNormal style='text-indent:36.0pt'><a name=EBxx><b><span lang=EN-US
style='mso-ansi-language:EN-US'>AT91SAM7S-EK </span></b></a><span style='mso-bookmark:
EBxx'><span lang=EN-US style='mso-ansi-language:EN-US'>evaluation board</span></span><span
lang=EN-US style='mso-ansi-language:EN-US'><o:p></o:p></span></p>
  <p class=MsoBodyTextIndent><span lang=EN-US>Push Buttons and LEDs: The FIQ, 
    IRQ0, TIOA0 and TIOB switches are debounced and buffered. <br>
    Please note that the jumper CB6 must be open (SW1-4 inputs to the AT91 are 
    valid).By default, this jumper is not equipped (open) </span></p>
  <p class=MsoNormal style='margin-left:36.0pt;text-indent:36.0pt'><b><span
lang=EN-US style='mso-ansi-language:EN-US'>- SW1 :</span></b><span lang=EN-US
style='mso-ansi-language:EN-US'> (AT91C_PA19_FIQ) Used in peripheral mode for 
    the FIQ input<o:p></o:p></span></p>
  <p class=MsoNormal style='margin-left:36.0pt;text-indent:36.0pt'><b><span
lang=EN-US style='mso-ansi-language:EN-US'>- SW2 :</span></b><span lang=EN-US
style='mso-ansi-language:EN-US'> (AT91C_PA20_IRQ0) Used in peripheral mode for 
    the IRQ0 interrupt<o:p></o:p></span></p>
  <p class=MsoNormal style='margin-left:36.0pt;text-indent:36.0pt'><b><span
lang=EN-US style='mso-ansi-language:EN-US'>- SW3 :</span></b><span lang=EN-US
style='mso-ansi-language:EN-US'> (AT91C_PIO_PA15) Used in standard PIO mode for 
    the PIO input <o:p></o:p></span></p>
  <p class=MsoNormal style='margin-left:36.0pt;text-indent:36.0pt'><b><span
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