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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="Modify a RWRegister or UnsafeRWRegister."><title>modify_reg in imxrt_ral - 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="imxrt_ral" 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 macro"><!--[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="../imxrt_ral/index.html">imxrt_<wbr>ral</a><span class="version">0.5.3</span></h2></div><div class="sidebar-elems"></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>Macro <a href="index.html">imxrt_ral</a>::<wbr><a class="macro" href="#">modify_reg</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/ral_registers/lib.rs.html#420">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><span class="macro">macro_rules!</span> modify_reg {
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( <span class="macro-nonterminal">$periph</span>:path, <span class="macro-nonterminal">$instance</span>:expr, <span class="macro-nonterminal">$reg</span>:ident $([<span class="macro-nonterminal">$offset</span>:expr])<span class="kw-2">*</span>, $( <span class="macro-nonterminal">$field</span>:ident : <span class="macro-nonterminal">$value</span>:expr ),+ $(,)<span class="question-mark">? </span>) => { ... };
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( <span class="macro-nonterminal">$periph</span>:path, <span class="macro-nonterminal">$instance</span>:expr, <span class="macro-nonterminal">$reg</span>:ident $([<span class="macro-nonterminal">$offset</span>:expr])<span class="kw-2">*</span>, <span class="macro-nonterminal">$</span><span class="kw">fn</span>:<span class="macro-nonterminal">expr </span>) => { ... };
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}</pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Modify a RWRegister or UnsafeRWRegister.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// Safely acquire the peripheral instance (will panic if already acquired)
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</span><span class="kw">let </span>gpioa = stm32ral::gpio::GPIOA::take().unwrap();
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<span class="comment">// Update the register to ensure bit 3 is set.
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</span><span class="macro">modify_reg!</span>(stm32ral::gpio, gpioa, ODR, |reg| reg | (<span class="number">1</span><<<span class="number">3</span>));
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<span class="comment">// Write values to specific fields. Unspecified fields are left unchanged.
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</span><span class="macro">modify_reg!</span>(stm32ral::gpio, gpioa, MODER, MODER3: Output, MODER4: Analog);
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<span class="comment">// Unsafe access without requiring you to first `take()` the instance
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</span><span class="kw">unsafe </span>{ <span class="macro">modify_reg!</span>(stm32ral::gpio, GPIOA, MODER, MODER3: Output, MODER4: Analog) };</code></pre></div>
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<p>To support register arrays, each macro form also supports one or more array indices after the
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register. For example, <code>modify_reg!(stm32ral::gpio, gpioa, ODR[2], |reg| reg | (1<<3));</code> sets
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a high bit in the third register of an <code>ODR</code> register array.</p>
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<h2 id="usage"><a class="doc-anchor" href="#usage">§</a>Usage</h2>
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<p>Like <code>write_reg!</code>, this macro can be used in two ways, either with a modification of the entire
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register, or by specifying which fields to change and what value to change them to.</p>
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<p>In both cases, the first arguments are:</p>
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<ul>
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<li>the path to the peripheral module: <code>stm32ral::gpio</code>,</li>
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<li>a reference to the instance of that peripheral: ‘gpioa’ (anything which dereferences to
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<code>RegisterBlock</code>, such as <code>Instance</code>, <code>&Instance</code>, <code>&RegisterBlock</code>, or
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<code>*const RegisterBlock</code>),</li>
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<li>the register (and offset, for arrays) you wish you access: <code>MODER</code> (a field on the
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<code>RegisterBlock</code>).</li>
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</ul>
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<p>In the whole-register usage, the final argument is a closure that accepts the current value
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of the register and returns the new value to write:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// Turn on PA3 without affecting anything else.
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</span><span class="macro">modify_reg!</span>(stm32ral::gpio, gpioa, ODR, |reg| reg | (<span class="number">1</span><<<span class="number">3</span>));</code></pre></div>
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<p>Otherwise, the remaining arguments are <code>Field: Value</code> pairs:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// Set PA3 to Output, PA4 to Analog, and leave everything else unchanged.
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</span><span class="macro">modify_reg!</span>(stm32ral::gpio, gpioa, MODER, MODER3: <span class="number">0b01</span>, MODER4: <span class="number">0b11</span>);</code></pre></div>
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<p>For fields with annotated values, you can also specify a named value:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// As above, but with named values.
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</span><span class="macro">modify_reg!</span>(stm32ral::gpio, gpioa, MODER, MODER3: Output, MODER4: Analog);</code></pre></div>
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<p>This macro expands to calling <code>(*instance).register.write(value)</code>.
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When called with a closure, <code>(*instance).register.read()</code> is called, the result
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passed in to the closure, and the return value of the closure is used for <code>value</code>.
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When called with <code>Field: Value</code> arguments, the current value is read and then masked
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according to the specified fields, and then ORd with the OR of each field value,
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each masked and shifted appropriately for the field. The named values are brought into scope
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by <code>use peripheral::register::field::*</code> for each field. The same constants could just be
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specified manually:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// As above, but being explicit about named values.
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</span><span class="macro">modify_reg!</span>(stm32ral::gpio, gpioa, MODER, MODER3: stm32ral::gpio::MODER::MODER3::RW::Output,
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MODER4: stm32ral::gpio::MODER::MODER4::RW::Analog);</code></pre></div>
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<p>The fully expanded form is equivalent to:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// As above, but expanded.
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</span>(<span class="kw-2">*</span>gpioa).MODER.write(
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(
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<span class="comment">// First read the current value...
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</span>(<span class="kw-2">*</span>gpioa).MODER.read()
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<span class="comment">// Then AND it with an appropriate mask...
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</span>&
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!( stm32ral::gpio::MODER::MODER3::mask | stm32ral::gpio::MODER::MODER4::mask )
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)
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<span class="comment">// Then OR with each field value.
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</span>|
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((stm32ral::gpio::MODER::MODER3::RW::Output << stm32ral::gpio::MODER::MODER3::offset)
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& stm32ral::gpio::MODER::MODER3::mask)
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((stm32ral::gpio::MODER::MODER4::RW::Analog << stm32ral::gpio::MODER::MODER3::offset)
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& stm32ral::gpio::MODER::MODER3::mask)
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);</code></pre></div>
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<h2 id="safety"><a class="doc-anchor" href="#safety">§</a>Safety</h2>
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<p>This macro will require an unsafe function or block when used with an UnsafeRWRegister,
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but not if used with RWRegister.</p>
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<p>When run in an unsafe context, peripheral instances are directly accessible without requiring
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having called <code>take()</code> beforehand:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">unsafe </span>{ <span class="macro">modify_reg!</span>(stm32ral::gpio, GPIOA, MODER, MODER3: Output, MODER4: Analog) };</code></pre></div>
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<p>This works because <code>GPIOA</code> is a <code>*const RegisterBlock</code> in the <code>stm32ral::gpio</code> module;
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and the macro brings such constants into scope and then dereferences the provided reference.</p>
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</div></details></section></div></main></body></html>
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