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<h1 id="firstHeading" class="firstHeading">How to handle an interrupt</h1>
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<div id="bodyContent">
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<h3 id="siteSub">From Milkymist Wiki</h3>
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<div id="jump-to-nav">Jump to: <a href="index.php%3Ftitle=How_to_handle_an_interrupt.html#column-one">navigation</a>, <a href="index.php%3Ftitle=How_to_handle_an_interrupt.html#searchInput">search</a></div> <!-- start content -->
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<p>WIP some snipets from [slides| <a href="http://lekernel.net/presentations/masteri2l/conf/mm_i2l.pdf" class="external free" title="http://lekernel.net/presentations/masteri2l/conf/mm_i2l.pdf" rel="nofollow">http://lekernel.net/presentations/masteri2l/conf/mm_i2l.pdf</a>]
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</p><p>Interruptions.
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</p><p>Example : serial port
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</p>
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<ul><li> Register at 0xe0000000.
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</li></ul>
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<ul><li> Interruption 0 after a character is received
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</li><li> Interruption 1 after a character is received sent
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</li></ul>
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<pre>void transmit(char c)
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{
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/* write a character */
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*((volatile unsigned int *)0xe0000000) = c;
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/* after a character is received */
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while(!(lm32_interrupts_pending() & (1 << 0)));
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/* acknowledge interrupt */
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lm32_interrupt_ack(1 << 0);
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}
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</pre>
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<pre>char receive()
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{
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/* reception loop */
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while(!(lm32_interrupts_pending() & (1 << 1)));
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/* acknowledge interruption */
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lm32_interrupt_ack(1 << 1);
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/* read character */
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return *((volatile unsigned int *)0xe0000000);
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}
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</pre>
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<p><br />
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You need some asm at startup <a href="https://github.com/milkymist/milkymist/blob/master/software/bios/crt0.S#L63" class="external free" title="https://github.com/milkymist/milkymist/blob/master/software/bios/crt0.S#L63" rel="nofollow">https://github.com/milkymist/milkymist/blob/master/software/bios/crt0.S#L63</a>
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</p><p>Then a interrupt service routine, a software routine that is executed in response to an interrupt <a href="https://github.com/milkymist/milkymist/blob/master/software/bios/isr.c#L32" class="external free" title="https://github.com/milkymist/milkymist/blob/master/software/bios/isr.c#L32" rel="nofollow">https://github.com/milkymist/milkymist/blob/master/software/bios/isr.c#L32</a>
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</p><p>And the lib for uart for this example in this case <a href="https://github.com/milkymist/milkymist/blob/master/software/libbase/uart.c#L48" class="external free" title="https://github.com/milkymist/milkymist/blob/master/software/libbase/uart.c#L48" rel="nofollow">https://github.com/milkymist/milkymist/blob/master/software/libbase/uart.c#L48</a>
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</p>
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<li id="lastmod"> This page was last modified on 19 October 2011, at 20:47.</li>
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