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Merge request <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1294">!1294</a> was reviewed by <a href="https://gitlab.rtems.org/c-mauderer">Christian Mauderer</a>
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<p style="color: #777777;">
<a href="https://gitlab.rtems.org/c-mauderer">Christian Mauderer</a>
started a new
discussion on <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1294#note_152099">bsps/arm/stm32f4/spi/spi.c</a>:
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<td class="new_line diff-line-num new" data-linenumber="116" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
116
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">uint8_t</span> <span class="n" style="color: #333333;">byte</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #009999;">0</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="117" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
117
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333333;">bus</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">tx_buf</span> <span class="o" style="font-weight: 600;">!=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="118" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
118
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"> <span class="n" style="color: #333333;">byte</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333333;">bus</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">tx_buf</span><span class="o" style="font-weight: 600;">++</span><span class="p">;</span></span>
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">That line is completely correct. But usually I would suggest splitting it into two for better readability:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style="display: block; font-size: 90%; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #ffffff; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; margin: 0 0 1rem; padding: 12px; border: 1px solid #dcdcde;"><code style="font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;"><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">byte = *bus->tx_buf;</span>
<span id="LC2" class="line" lang="plaintext">++bus->tx_buf;</span></code></pre>
<copy-code></copy-code><insert-code-snippet></insert-code-snippet>
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<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">Same is true for the rx_buf a bit further below.</p>
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<p style="color: #777777;">
<a href="https://gitlab.rtems.org/c-mauderer">Christian Mauderer</a>
started a new
discussion on <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1294#note_152100">bsps/arm/stm32f4/spi/spi.c</a>:
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<td class="old_line diff-line-num new" data-linenumber="1" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="new_line diff-line-num new" data-linenumber="123" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
123
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"><span class="cm" style="color: #999988; font-style: italic;"> * for RXNE so we do not send another byte before the current one</span></span>
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<td class="new_line diff-line-num new" data-linenumber="124" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
124
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"><span class="cm" style="color: #999988; font-style: italic;"> * has been received (full-duplex, one byte in flight).</span></span>
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125
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"><span class="cm" style="color: #999988; font-style: italic;"> */</span></span>
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<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">At the moment, you have two interrupts per byte. My guess would be that it is possible to only use the RX interrupt. You make sure that only one byte is in flight. So as soon as you received one byte, you can just put the next byte into the transmit buffer. Or did I miss anything?</p>
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<p style="color: #777777;">
<a href="https://gitlab.rtems.org/c-mauderer">Christian Mauderer</a>
started a new
discussion on <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1294#note_152101">spec/build/bsps/arm/stm32f4/obj.yml</a>:
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<td class="line_content" style="padding: inherit;"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;"> <span class="line" data-lang="yaml"><span class="na" style="color: #008080;">copyrights</span><span class="pi">:</span></span>
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<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">-<span class="line" data-lang="yaml"><span class="pi">-</span> <span class="s" style="color: #dd1144;">Copyright (C) 2020 embedded brains GmbH & Co. KG</span></span>
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<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">That looks like a formatting change. Could you split that into a separate commit so that it is clear what you have added in that file?</p>
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