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<ol class="chapter"><li class="affix"><a href="../index.html">Introduction</a></li><li class="affix"><a href="../background/index.html">Background</a></li><li class="affix"><a href="../requirements/index.html">Requirements</a></li><li><a href="../hardware/index.html"><strong aria-hidden="true">1.</strong> Meet your hardware</a></li><li><a href="../setup/index.html"><strong aria-hidden="true">2.</strong> Development environment setup</a></li><li><ol class="section"><li><a href="../setup/LINUX.html"><strong aria-hidden="true">2.1.</strong> Linux</a></li><li><a href="../setup/WINDOWS.html"><strong aria-hidden="true">2.2.</strong> Windows</a></li><li><a href="../setup/MACOS.html"><strong aria-hidden="true">2.3.</strong> macOS</a></li><li><a href="../setup/VERIFY.html"><strong aria-hidden="true">2.4.</strong> Verify the installation</a></li></ol></li><li><a href="../getting-started/00.00.README.html"><strong aria-hidden="true">3.</strong> Getting started</a></li><li><ol class="section"><li><a href="../getting-started/01.00.BUILD.html"><strong aria-hidden="true">3.1.</strong> Building</a></li><li><a href="../getting-started/02.00.FLASH.html"><strong aria-hidden="true">3.2.</strong> Flashing</a></li><li><a href="../getting-started/03.00.DEBUG.html"><strong aria-hidden="true">3.3.</strong> Debugging</a></li><li><a href="../getting-started/04.00.SOLUTION.html"><strong aria-hidden="true">3.4.</strong> Solution</a></li></ol></li><li><a href="../hello-world/00.00.README.html"><strong aria-hidden="true">4.</strong> Hello world</a></li><li><ol class="section"><li><a href="../hello-world/01.00.SEMIHOSTING.html"><strong aria-hidden="true">4.1.</strong> Semihosting</a></li><li><a href="../hello-world/02.00.UART.html"><strong aria-hidden="true">4.2.</strong> Serial communication</a></li><li><ol class="section"><li><a href="../hello-world/02.01.NIX.html"><strong aria-hidden="true">4.2.1.</strong> *nix</a></li><li><a href="../hello-world/02.02.WINDOWS.html"><strong aria-hidden="true">4.2.2.</strong> Windows</a></li></ol></li><li><a href="../hello-world/03.00.LED.html"><strong aria-hidden="true">4.3.</strong> GPIO and LEDs</a></li><li><ol class="section"><li><a href="../hello-world/03.01.SOLUTION.html"><strong aria-hidden="true">4.3.1.</strong> Solution</a></li></ol></li></ol></li><li><a href="../choice/00.00.README.html"><strong aria-hidden="true">5.</strong> Choose Your Own Adventure</a></li><li><a href="../microbit/00.00.README.html"><strong aria-hidden="true">6.</strong> micro:bit HAL basics</a></li><li><ol class="section"><li><a href="../microbit/01.00.BUTTONS.html"><strong aria-hidden="true">6.1.</strong> Buttons</a></li><li><a href="../microbit/02.00.DELAY.html"><strong aria-hidden="true">6.2.</strong> Delays</a></li><li><a href="../microbit/03.00.DISPLAY.html"><strong aria-hidden="true">6.3.</strong> Display</a></li></ol></li><li><a href="../serial/00.00.README.html"><strong aria-hidden="true">7.</strong> Serial UART - 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<main>
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<a class="header" href="#multiplexing" id="multiplexing"><h1>Multiplexing</h1></a>
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<blockquote>
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<p>Multiplex the rows of the matrix</p>
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</blockquote>
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<pre><pre class="playpen"><code class="language-rust">
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# #![allow(unused_variables)]
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#fn main() {
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/// Display 3x9 matrix image for a given duration.
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pub fn display_pre(&mut self, delay: &mut Delay, led_matrix: [[u8; 9]; 3], duration_ms: u32) {
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// TODO
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// These need to be populated with PINs, e.g.:
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let rows = [PIN; 3];
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let cols = [PIN; 9];
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// Set refresh rate.
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let delay_ms = 2;
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// Calculate number of loops.
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let loops = duration_ms / (rows.len() as u32 * delay_ms);
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for _ in 0..loops {
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for (row_line, led_matrix_row) in rows.iter_mut().zip(led_matrix.iter()) {
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// Set the row high.
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row_line.set_high();
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// Set the correct pins low (on)
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// This could lead to very small differences in execution time,
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// but this is not worth correcting for, as it is << 2ms.
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for (col_line, led_matrix_val) in cols.iter_mut().zip(led_matrix_row.iter()) {
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// We ignore any brightness setting, just use 0 and 1.
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if *led_matrix_val > 0 {
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col_line.set_low();
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}
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}
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delay.delay_ms(delay_ms);
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// It is not worth the logic to check which pins need resetting,
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// so set all the pins back high.
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for col_line in &mut cols {
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col_line.set_high();
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}
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// Set the row back low.
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row_line.set_low();
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}
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}
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}
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#}</code></pre></pre>
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