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<p style="color: #777777;">
<a href="https://gitlab.rtems.org/opticron">Kinsey Moore</a>
commented on a
discussion on <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/363#note_122272">bsps/aarch64/raspberrypi/i2c/raspberrypi-i2c.c</a>:
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<td class="new_line diff-line-num new" data-linenumber="132" 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="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="LC132" class="line" lang="c"> <span class="o" style="font-weight: 600;">++</span><span class="n" style="color: #333333;">divider</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="133" 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">
133
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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="LC133" class="line" lang="c"> <span class="n" style="color: #333333;">clock_rate</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">BSC_CORE_CLK_HZ</span> <span class="o" style="font-weight: 600;">/</span> <span class="n" style="color: #333333;">divider</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="134" 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">
134
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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="LC134" class="line" lang="c"> <span class="p">}</span></span>
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135
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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="LC135" class="line" lang="c"> </span>
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<td class="new_line diff-line-num new" data-linenumber="136" 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">
136
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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="LC136" class="line" lang="c"> <span class="n" style="color: #333333;">BCM2835_REG</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;">base_address</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333333;">BCM2711_I2C_DIV</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">divider</span><span class="p">;</span></span>
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137
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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="LC137" class="line" lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="138" 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">
138
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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="LC138" class="line" lang="c"> <span class="n" style="color: #333333;">bus</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">input_clock</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">clock_rate</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="139" 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">
139
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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="LC139" class="line" lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="140" 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">
140
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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="LC140" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="mi" style="color: #009999;">0</span><span class="p">;</span></span>
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141
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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="LC141" class="line" lang="c"><span class="p">}</span></span>
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142
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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="LC142" class="line" lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="143" 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">
143
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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="LC143" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #445588; font-weight: 600;">int</span> <span class="nf" style="color: #990000; font-weight: 600;">rpi_i2c_setup_transfer</span><span class="p">(</span><span class="n" style="color: #333333;">raspberrypi_i2c_bus</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333333;">bus</span><span class="p">)</span></span>
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<td class="new_line diff-line-num new" data-linenumber="144" 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">
144
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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="LC144" class="line" lang="c"><span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="145" 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">
145
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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="LC145" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">int</span> <span class="n" style="color: #333333;">rv</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="146" 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">
146
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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="LC146" class="line" lang="c"> <span class="k" style="font-weight: 600;">while</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;">remaining_transfers</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="147" 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">
147
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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="LC147" class="line" lang="c"> <span class="n" style="color: #333333;">bus</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">remaining_bytes</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;">remaining_transfers</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #009999;">1</span> <span class="o" style="font-weight: 600;">?</span> <span class="mh" style="color: #009999;">0xFFFF</span> <span class="o" style="font-weight: 600;">:</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;">current_buffer_size</span> <span class="o" style="font-weight: 600;">&</span> <span class="mh" style="color: #009999;">0xFFFF</span><span class="p">);</span></span>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">This could be broken apart and explained with a comment in the code. It seems like there might also be an off-by-one error here. Magic numbers sprinkled in the code are discouraged, so I've :</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;">/* I would expect the correct value here to be 0x10000 instead of 0xFFFF */</span>
<span id="LC2" class="line" lang="plaintext">/* Full transfer size is 0xFFFF bytes */</span>
<span id="LC3" class="line" lang="plaintext">#define I2C_TRANSFER_SIZE 0xFFFF</span>
<span id="LC4" class="line" lang="plaintext">bus->remaining_bytes = I2C_TRANSFER_SIZE;</span>
<span id="LC5" class="line" lang="plaintext">/* If there is only 1 transfer remaining, consume the remainder of the data */</span>
<span id="LC6" class="line" lang="plaintext">if (bus->remaining_transfers == 1) {</span>
<span id="LC7" class="line" lang="plaintext"> bus->remaining_bytes = bus->current_buffer_size % I2C_TRANSFER_SIZE;</span>
<span id="LC8" class="line" lang="plaintext">}</span></code></pre>
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