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<a href="https://gitlab.rtems.org/sebhub">Sebastian Huber</a>
commented on a
discussion on <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/199#note_112141">bsps/shared/dev/serial/zynq-uart-polled.c</a>:
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<td class="new_line diff-line-num new" data-linenumber="61" 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">
61
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC61" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333333;">desired_baud</span><span class="p">,</span></span>
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62
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC62" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333333;">mode_clks</span><span class="p">,</span></span>
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<td class="new_line diff-line-num new" data-linenumber="63" 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">
63
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC63" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">uint32_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333333;">cd_ptr</span><span class="p">,</span></span>
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<td class="new_line diff-line-num new" data-linenumber="64" 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">
64
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC64" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">uint32_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333333;">bdiv_ptr</span></span>
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65
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC65" class="line" lang="c"><span class="p">)</span></span>
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66
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC66" class="line" lang="c"><span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="67" 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">
67
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC67" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333333;">best_error</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">UINT32_MAX</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="68" 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">
68
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC68" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333333;">best_cd</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="69" 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">
69
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC69" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333333;">best_bdiv_plus_one</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="70" 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">
70
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC70" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333333;">bdiv_plus_one</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="71" 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">
71
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC71" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333333;">selected_clock</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="72" 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">
72
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC72" class="line" lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="73" 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">
73
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC73" class="line" lang="c"> <span class="n" style="color: #333333;">_Assert</span><span class="p">((</span><span class="n" style="color: #333333;">mode_clks</span> <span class="o" style="font-weight: 600;">&</span> <span class="o" style="font-weight: 600;">~</span><span class="n" style="color: #333333;">ZYNQ_UART_MODE_CLKS</span><span class="p">)</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="74" 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">
74
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC74" class="line" lang="c"> <span class="n" style="color: #333333;">selected_clock</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">zynq_uart_input_clock</span><span class="p">()</span> <span class="o" style="font-weight: 600;">/</span> <span class="p">(</span><span class="mi" style="color: #009999;">1U</span> <span class="o" style="font-weight: 600;"><<</span> <span class="p">(</span><span class="mi" style="color: #009999;">3</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333333;">mode_clks</span><span class="p">));</span></span>
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<td class="new_line diff-line-num new" data-linenumber="75" 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">
75
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC75" class="line" lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="76" 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">
76
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC76" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333333;">bdiv_plus_one</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #009999;">5</span><span class="p">;</span> <span class="n" style="color: #333333;">bdiv_plus_one</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #009999;">256</span><span class="p">;</span> <span class="o" style="font-weight: 600;">++</span><span class="n" style="color: #333333;">bdiv_plus_one</span><span class="p">)</span> <span class="p">{</span></span>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">The previous code just selected the best error. In the new code we have this:</p>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style="display: block; font-size: 90%; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: monospace; word-break: break-all; word-wrap: break-word; background-color: #ffffff; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; margin: 0 0 16px; 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; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;"> /*</span>
<span id="LC2" class="line" lang="plaintext"> * The procedure to detect a start bit uses three samples in the middle of</span>
<span id="LC3" class="line" lang="plaintext"> * an RX-bit. If the sample set is too small, there may be a sample in</span>
<span id="LC4" class="line" lang="plaintext"> * another bit in case the baud setting is not accurate. Most noise is in</span>
<span id="LC5" class="line" lang="plaintext"> * the form of small peaks, if the sample rate is too high, then noise may</span>
<span id="LC6" class="line" lang="plaintext"> * get detected as a bit.</span>
<span id="LC7" class="line" lang="plaintext"> *</span>
<span id="LC8" class="line" lang="plaintext"> * Prefer an sample set of around 16 per RX-bit.</span>
<span id="LC9" class="line" lang="plaintext"> */</span>
<span id="LC10" class="line" lang="plaintext"> if (error < best_error || (bdiv_plus_one <= 20 && error <= best_error)) {</span>
<span id="LC11" class="line" lang="plaintext"> best_error = error;</span>
<span id="LC12" class="line" lang="plaintext"> best_cd = cd;</span>
<span id="LC13" class="line" lang="plaintext"> best_bdiv_plus_one = bdiv_plus_one;</span>
<span id="LC14" class="line" lang="plaintext"> }</span></code></pre>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">In my tests I got this on the ZCU104:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style="display: block; font-size: 90%; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: monospace; word-break: break-all; word-wrap: break-word; background-color: #ffffff; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; margin: 0 0 16px; 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; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">desired baud: 9600, actual baud: 9600, error 0, max error: 288, cd: 651, bdiv: 15</span>
<span id="LC2" class="line" lang="plaintext">desired baud: 19200, actual baud: 19201, error 1, max error: 576, cd: 372, bdiv: 13</span>
<span id="LC3" class="line" lang="plaintext">desired baud: 38400, actual baud: 38402, error 2, max error: 1152, cd: 186, bdiv: 13</span>
<span id="LC4" class="line" lang="plaintext">desired baud: 57600, actual baud: 57603, error 3, max error: 1728, cd: 124, bdiv: 13</span>
<span id="LC5" class="line" lang="plaintext">desired baud: 115200, actual baud: 115207, error 7, max error: 3456, cd: 62, bdiv: 13</span></code></pre>
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