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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Programmable IO block"><title>rp2040_pac::pio0 - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-492a78a4a87dcc01.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="rp2040_pac" data-themes="" data-resource-suffix="" data-rustdoc-version="1.82.0 (f6e511eec 2024-10-15)" data-channel="1.82.0" data-search-js="search-a99f1315e7cc5121.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-921df33f47b8780c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-3b12f09e550e0385.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../rp2040_pac/index.html">rp2040_<wbr>pac</a><span class="version">0.6.0</span></h2></div><h2 class="location"><a href="#">Module pio0</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#reexports">Re-exports</a></li><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#types">Type Aliases</a></li></ul></section><h2><a href="../index.html">In crate rp2040_<wbr>pac</a></h2></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Module <a href="../index.html">rp2040_pac</a>::<wbr><a class="mod" href="#">pio0</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../src/rp2040_pac/pio0.rs.html#1-286">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Programmable IO block</p>
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</div></details><h2 id="reexports" class="section-header">Re-exports<a href="#reexports" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name" id="reexport.SM"><code>pub use self::sm::<a class="struct" href="sm/struct.SM.html" title="struct rp2040_pac::pio0::sm::SM">SM</a>;</code></div></li><li><div class="item-name" id="reexport.SM_IRQ"><code>pub use self::sm_irq::<a class="struct" href="sm_irq/struct.SM_IRQ.html" title="struct rp2040_pac::pio0::sm_irq::SM_IRQ">SM_IRQ</a>;</code></div></li></ul><h2 id="modules" class="section-header">Modules<a href="#modules" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="mod" href="ctrl/index.html" title="mod rp2040_pac::pio0::ctrl">ctrl</a></div><div class="desc docblock-short">PIO control register</div></li><li><div class="item-name"><a class="mod" href="dbg_cfginfo/index.html" title="mod rp2040_pac::pio0::dbg_cfginfo">dbg_<wbr>cfginfo</a></div><div class="desc docblock-short">The PIO hardware has some free parameters that may vary between chip products.<br />
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These should be provided in the chip datasheet, but are also exposed here.</div></li><li><div class="item-name"><a class="mod" href="dbg_padoe/index.html" title="mod rp2040_pac::pio0::dbg_padoe">dbg_<wbr>padoe</a></div><div class="desc docblock-short">Read to sample the pad output enables (direction) PIO is currently driving to the GPIOs. On RP2040 there are 30 GPIOs, so the two most significant bits are hardwired to 0.</div></li><li><div class="item-name"><a class="mod" href="dbg_padout/index.html" title="mod rp2040_pac::pio0::dbg_padout">dbg_<wbr>padout</a></div><div class="desc docblock-short">Read to sample the pad output values PIO is currently driving to the GPIOs. On RP2040 there are 30 GPIOs, so the two most significant bits are hardwired to 0.</div></li><li><div class="item-name"><a class="mod" href="fdebug/index.html" title="mod rp2040_pac::pio0::fdebug">fdebug</a></div><div class="desc docblock-short">FIFO debug register</div></li><li><div class="item-name"><a class="mod" href="flevel/index.html" title="mod rp2040_pac::pio0::flevel">flevel</a></div><div class="desc docblock-short">FIFO levels</div></li><li><div class="item-name"><a class="mod" href="fstat/index.html" title="mod rp2040_pac::pio0::fstat">fstat</a></div><div class="desc docblock-short">FIFO status register</div></li><li><div class="item-name"><a class="mod" href="input_sync_bypass/index.html" title="mod rp2040_pac::pio0::input_sync_bypass">input_<wbr>sync_<wbr>bypass</a></div><div class="desc docblock-short">There is a 2-flipflop synchronizer on each GPIO input, which protects PIO logic from metastabilities. This increases input delay, and for fast synchronous IO (e.g. SPI) these synchronizers may need to be bypassed. Each bit in this register corresponds to one GPIO.<br />
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0 -> input is synchronized (default)<br />
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1 -> synchronizer is bypassed<br />
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If in doubt, leave this register as all zeroes.</div></li><li><div class="item-name"><a class="mod" href="instr_mem/index.html" title="mod rp2040_pac::pio0::instr_mem">instr_<wbr>mem</a></div><div class="desc docblock-short">Write-only access to instruction memory location %s</div></li><li><div class="item-name"><a class="mod" href="intr/index.html" title="mod rp2040_pac::pio0::intr">intr</a></div><div class="desc docblock-short">Raw Interrupts</div></li><li><div class="item-name"><a class="mod" href="irq/index.html" title="mod rp2040_pac::pio0::irq">irq</a></div><div class="desc docblock-short">State machine IRQ flags register. Write 1 to clear. There are 8 state machine IRQ flags, which can be set, cleared, and waited on by the state machines. There’s no fixed association between flags and state machines – any state machine can use any flag.</div></li><li><div class="item-name"><a class="mod" href="irq_force/index.html" title="mod rp2040_pac::pio0::irq_force">irq_<wbr>force</a></div><div class="desc docblock-short">Writing a 1 to each of these bits will forcibly assert the corresponding IRQ. Note this is different to the INTF register: writing here affects PIO internal state. INTF just asserts the processor-facing IRQ signal for testing ISRs, and is not visible to the state machines.</div></li><li><div class="item-name"><a class="mod" href="rxf/index.html" title="mod rp2040_pac::pio0::rxf">rxf</a></div><div class="desc docblock-short">Direct read access to the RX FIFO for this state machine. Each read pops one word from the FIFO. Attempting to read from an empty FIFO has no effect on the FIFO state, and sets the sticky FDEBUG_RXUNDER error flag for this FIFO. The data returned to the system on a read from an empty FIFO is undefined.</div></li><li><div class="item-name"><a class="mod" href="sm/index.html" title="mod rp2040_pac::pio0::sm">sm</a></div><div class="desc docblock-short">Cluster
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Cluster SM%s, containing SM*_CLKDIV, SM*_EXECCTRL, SM*_SHIFTCTRL, SM*_ADDR, SM*_INSTR, SM*_PINCTRL</div></li><li><div class="item-name"><a class="mod" href="sm_irq/index.html" title="mod rp2040_pac::pio0::sm_irq">sm_irq</a></div><div class="desc docblock-short">Cluster
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Cluster SM_IRQ%s, containing IRQ*_INTE, IRQ*_INTF, IRQ*_INTS</div></li><li><div class="item-name"><a class="mod" href="txf/index.html" title="mod rp2040_pac::pio0::txf">txf</a></div><div class="desc docblock-short">Direct write access to the TX FIFO for this state machine. Each write pushes one word to the FIFO. Attempting to write to a full FIFO has no effect on the FIFO state or contents, and sets the sticky FDEBUG_TXOVER error flag for this FIFO.</div></li></ul><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.RegisterBlock.html" title="struct rp2040_pac::pio0::RegisterBlock">Register<wbr>Block</a></div><div class="desc docblock-short">Register block</div></li></ul><h2 id="types" class="section-header">Type Aliases<a href="#types" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="type" href="type.CTRL.html" title="type rp2040_pac::pio0::CTRL">CTRL</a></div><div class="desc docblock-short">CTRL (rw) register accessor: PIO control register</div></li><li><div class="item-name"><a class="type" href="type.DBG_CFGINFO.html" title="type rp2040_pac::pio0::DBG_CFGINFO">DBG_<wbr>CFGINFO</a></div><div class="desc docblock-short">DBG_CFGINFO (r) register accessor: The PIO hardware has some free parameters that may vary between chip products.<br />
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These should be provided in the chip datasheet, but are also exposed here.</div></li><li><div class="item-name"><a class="type" href="type.DBG_PADOE.html" title="type rp2040_pac::pio0::DBG_PADOE">DBG_<wbr>PADOE</a></div><div class="desc docblock-short">DBG_PADOE (r) register accessor: Read to sample the pad output enables (direction) PIO is currently driving to the GPIOs. On RP2040 there are 30 GPIOs, so the two most significant bits are hardwired to 0.</div></li><li><div class="item-name"><a class="type" href="type.DBG_PADOUT.html" title="type rp2040_pac::pio0::DBG_PADOUT">DBG_<wbr>PADOUT</a></div><div class="desc docblock-short">DBG_PADOUT (r) register accessor: Read to sample the pad output values PIO is currently driving to the GPIOs. On RP2040 there are 30 GPIOs, so the two most significant bits are hardwired to 0.</div></li><li><div class="item-name"><a class="type" href="type.FDEBUG.html" title="type rp2040_pac::pio0::FDEBUG">FDEBUG</a></div><div class="desc docblock-short">FDEBUG (rw) register accessor: FIFO debug register</div></li><li><div class="item-name"><a class="type" href="type.FLEVEL.html" title="type rp2040_pac::pio0::FLEVEL">FLEVEL</a></div><div class="desc docblock-short">FLEVEL (r) register accessor: FIFO levels</div></li><li><div class="item-name"><a class="type" href="type.FSTAT.html" title="type rp2040_pac::pio0::FSTAT">FSTAT</a></div><div class="desc docblock-short">FSTAT (r) register accessor: FIFO status register</div></li><li><div class="item-name"><a class="type" href="type.INPUT_SYNC_BYPASS.html" title="type rp2040_pac::pio0::INPUT_SYNC_BYPASS">INPU<wbr>T_<wbr>SYNC_<wbr>BYPASS</a></div><div class="desc docblock-short">INPUT_SYNC_BYPASS (rw) register accessor: There is a 2-flipflop synchronizer on each GPIO input, which protects PIO logic from metastabilities. This increases input delay, and for fast synchronous IO (e.g. SPI) these synchronizers may need to be bypassed. Each bit in this register corresponds to one GPIO.<br />
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0 -> input is synchronized (default)<br />
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1 -> synchronizer is bypassed<br />
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If in doubt, leave this register as all zeroes.</div></li><li><div class="item-name"><a class="type" href="type.INSTR_MEM.html" title="type rp2040_pac::pio0::INSTR_MEM">INST<wbr>R_<wbr>MEM</a></div><div class="desc docblock-short">INSTR_MEM (w) register accessor: Write-only access to instruction memory location %s</div></li><li><div class="item-name"><a class="type" href="type.INTR.html" title="type rp2040_pac::pio0::INTR">INTR</a></div><div class="desc docblock-short">INTR (r) register accessor: Raw Interrupts</div></li><li><div class="item-name"><a class="type" href="type.IRQ.html" title="type rp2040_pac::pio0::IRQ">IRQ</a></div><div class="desc docblock-short">IRQ (rw) register accessor: State machine IRQ flags register. Write 1 to clear. There are 8 state machine IRQ flags, which can be set, cleared, and waited on by the state machines. There’s no fixed association between flags and state machines – any state machine can use any flag.</div></li><li><div class="item-name"><a class="type" href="type.IRQ_FORCE.html" title="type rp2040_pac::pio0::IRQ_FORCE">IRQ_<wbr>FORCE</a></div><div class="desc docblock-short">IRQ_FORCE (w) register accessor: Writing a 1 to each of these bits will forcibly assert the corresponding IRQ. Note this is different to the INTF register: writing here affects PIO internal state. INTF just asserts the processor-facing IRQ signal for testing ISRs, and is not visible to the state machines.</div></li><li><div class="item-name"><a class="type" href="type.RXF.html" title="type rp2040_pac::pio0::RXF">RXF</a></div><div class="desc docblock-short">RXF (r) register accessor: Direct read access to the RX FIFO for this state machine. Each read pops one word from the FIFO. Attempting to read from an empty FIFO has no effect on the FIFO state, and sets the sticky FDEBUG_RXUNDER error flag for this FIFO. The data returned to the system on a read from an empty FIFO is undefined.</div></li><li><div class="item-name"><a class="type" href="type.TXF.html" title="type rp2040_pac::pio0::TXF">TXF</a></div><div class="desc docblock-short">TXF (w) register accessor: Direct write access to the TX FIFO for this state machine. Each write pushes one word to the FIFO. Attempting to write to a full FIFO has no effect on the FIFO state or contents, and sets the sticky FDEBUG_TXOVER error flag for this FIFO.</div></li></ul></section></div></main></body></html>
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