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| -rw-r--r-- | _site/archive/arduino-due/index.html | 5 | ||||
| -rw-r--r-- | _site/archive/arduino-uno/index.html | 34 | ||||
| -rw-r--r-- | _site/feed.xml | 2 | ||||
| -rw-r--r-- | _site/posts.xml | 2 |
4 files changed, 20 insertions, 23 deletions
diff --git a/_site/archive/arduino-due/index.html b/_site/archive/arduino-due/index.html index c4a0d5a..13e006e 100644 --- a/_site/archive/arduino-due/index.html +++ b/_site/archive/arduino-due/index.html @@ -97,10 +97,7 @@ OpenOCD config file and a linker script.</p> <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>$ openocd -f openocd-due.cfg </code></pre></div> </div> </li> - <li> - <p>Open a telnet session and check that the GPNVM1 bit is set. Otherwise -set it to 1:</p> - + <li>Open a telnet session and set the GPNVM1 bit to 1: <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>$ telnet localhost 4444 > halt > at91sam3 gpnvm show diff --git a/_site/archive/arduino-uno/index.html b/_site/archive/arduino-uno/index.html index 0c233c5..7509267 100644 --- a/_site/archive/arduino-uno/index.html +++ b/_site/archive/arduino-uno/index.html @@ -43,10 +43,10 @@ <h2 class="center" id="title">PROGRAMMING ATMEGA328P CHIPS</h2> <h6 class="center">10 APRIL 2025</h5> <br> - <div class="twocol justify"><p>This post is a step-by-step guide for wiring up ATmega328P ICs to run at 5 V -with a 16 MHz crystal and 3.3 V with an 8 MHz crystal. While the 5 V -configuration is common, the 3.3 V configuration can be advantageous in -low-power applications and when interfacing with parts that run at 3.3 V.</p> + <div class="twocol justify"><p>This post is a step-by-step guide for wiring up ATmega328P ICs to run at 5V +with a 16MHz crystal and 3.3V with an 8MHz crystal. While the 5V +configuration is common, the 3.3V configuration can be advantageous in +low-power applications and when interfacing with parts that run at 3.3V.</p> <h2 id="5v-16mhz-configuration">5V-16MHz configuration</h2> @@ -66,46 +66,46 @@ low-power applications and when interfacing with parts that run at 3.3 V.</p> </table> <ol> - <li>Connect pin 1 to 5 V via a 10 kΩ resistor.</li> - <li>Connect a 16 MHz crystal oscillator across pins 9 and 10.</li> - <li>Connect each pin of the crystal to ground via 22 pF capacitors.</li> - <li>Connect pins 7, 20, and 21 to 5 V.</li> + <li>Connect pin 1 to 5V via a 10kΩ resistor.</li> + <li>Connect a 16MHz crystal oscillator across pins 9 and 10.</li> + <li>Connect each pin of the crystal to ground via 22pF capacitors.</li> + <li>Connect pins 7, 20, and 21 to 5V.</li> <li>Connect pins 8 and 22 to ground.</li> </ol> -<p>In addition to the connections described above, it’s a good idea to add 0.1 μF +<p>In addition to the connections described above, it’s a good idea to add 0.1μF decoupling capacitors between pins 7, 20, and 21 and ground. <a href="Makefile">Here’s</a> a sample Makefile for avr-gcc and avrdude.</p> <h2 id="33v-8mhz-configuration">3.3V-8MHz configuration</h2> <p>The following steps use Arduino Uno as an ISP and Arduino utilities to program -ATmega328P’s bootloader and the fuses (e.g., BOD level) for a 3.3 V supply.</p> +ATmega328P’s bootloader and the fuses (e.g., BOD level) for a 3.3V supply.</p> <ol> <li>Upload the ‘ArduinoISP’ sketch to the Uno.</li> - <li>Wire up the ATmega328P as described in the previous section. Replace the 5 V -supply with a 3.3 V supply and use an 8 MHz crystal instead of the 16 MHz + <li>Wire up the ATmega328P as described in the previous section. Replace the 5V +supply with a 3.3V supply and use an 8MHz crystal instead of the 16MHz crystal.</li> <li>Connect the SPI ports (SCK, MISO, and MOSI) of the two MCUs.</li> <li>Connect Uno’s SS pin to the IC’s pin 1 (RESET).</li> - <li>The IC can be powered by the Arduino Uno’s 5 V pin.</li> + <li>The IC can be powered by the Arduino Uno’s 5V pin.</li> <li>Burn the bootloader to the ATmega328P: <ul> - <li>Select ‘ATmega328P (3.3 V, 8 MHz)’ from Tools > Processor.</li> + <li>Select ‘ATmega328P (3.3V, 8MHz)’ from Tools > Processor.</li> <li>Select ‘Arduino as ISP’ from Tools > Programmer.</li> <li>Select Tools > Burn Bootloader.</li> </ul> </li> </ol> -<p>The ATmega328P is now ready to run at 8 MHz with a 3.3 V power supply. You can +<p>The ATmega328P is now ready to run at 8MHz with a 3.3V power supply. You can upload programs to the ATmega328P as you usually would using avrdude. <a href="3v3.Makefile">Here’s</a> a sample Makefile with adjusted parameters (e.g., baud -rate) for an 8 MHz clock.</p> +rate) for an 8MHz clock.</p> <p>In both configurations, if you intend to use the ATmega328P’s analog-to-digital -converter with the internal 1.1 V or AV<sub>cc</sub> voltage as reference, do +converter with the internal 1.1V or AV<sub>cc</sub> voltage as reference, do not connect AREF (pin 21) to V<sub>cc</sub>. Refer to section 23.5.2 ADC Voltage Reference in the datasheet for more information.</p> diff --git a/_site/feed.xml b/_site/feed.xml index d2dcedc..3548f7c 100644 --- a/_site/feed.xml +++ b/_site/feed.xml @@ -1 +1 @@ -<?xml version="1.0" encoding="utf-8"?><feed xmlns="http://www.w3.org/2005/Atom" ><generator uri="https://jekyllrb.com/" version="4.4.1">Jekyll</generator><link href="http://localhost:4000/feed.xml" rel="self" type="application/atom+xml" /><link href="http://localhost:4000/" rel="alternate" type="text/html" /><updated>2025-11-02T11:27:10+08:00</updated><id>http://localhost:4000/feed.xml</id><title type="html">ASCIIMX | Archive</title><author><name>Wickramage Don Sadeep Madurange</name></author><entry><title type="html">Neo4J A* search</title><link href="http://localhost:4000/archive/neo4j-a-star-search/" rel="alternate" type="text/html" title="Neo4J A* search" /><published>2025-09-14T00:00:00+08:00</published><updated>2025-09-14T00:00:00+08:00</updated><id>http://localhost:4000/archive/neo4j-a-star-search</id><author><name>Wickramage Don Sadeep Madurange</name></author><summary type="html"><![CDATA[Back in 2018, we used the Neo4J graph database to track the movement of marine vessels. We were interested in the shortest path a ship could take through a network of about 13,000 route points. Performance issues with Neo4J’s then-available shortest-path algorithms limited our search to about 4,000 route points.]]></summary></entry><entry><title type="html">My first PCB</title><link href="http://localhost:4000/archive/my-first-pcb/" rel="alternate" type="text/html" title="My first PCB" /><published>2025-07-14T00:00:00+08:00</published><updated>2025-07-14T00:00:00+08:00</updated><id>http://localhost:4000/archive/my-first-pcb</id><author><name>Wickramage Don Sadeep Madurange</name></author><summary type="html"><![CDATA[In 2023, I started tinkering with DIY electronics as a hobby. Until now, I’ve been using development boards like the Arduino Uno and ESP-32-WROOM so that I can focus on the software. Recently, I decided to step outside of my comfort zone and design a PCB from scratch for a door lock I’m working on.]]></summary></entry><entry><title type="html">MOSFETs</title><link href="http://localhost:4000/archive/mosfet-switches/" rel="alternate" type="text/html" title="MOSFETs" /><published>2025-06-22T00:00:00+08:00</published><updated>2025-06-22T00:00:00+08:00</updated><id>http://localhost:4000/archive/mosfet-switches</id><author><name>Wickramage Don Sadeep Madurange</name></author><summary type="html"><![CDATA[Recently, I needed a low-power circuit for one of my battery-operated projects. Much of the system’s power savings depended on its ability to switch off power to components, such as servos, electronically when not needed. That’s how I stumbled upon MOSFETs, transistors capable of controlling circuits operating at voltages far above their own.]]></summary></entry><entry><title type="html">Awesome books</title><link href="http://localhost:4000/archive/awesome-books/" rel="alternate" type="text/html" title="Awesome books" /><published>2025-04-20T00:00:00+08:00</published><updated>2025-04-20T00:00:00+08:00</updated><id>http://localhost:4000/archive/awesome-books</id><author><name>Wickramage Don Sadeep Madurange</name></author><summary type="html"><![CDATA[This article contains a list of my favourite books.]]></summary></entry><entry><title type="html">Programming ATmega328P chips</title><link href="http://localhost:4000/archive/arduino-uno/" rel="alternate" type="text/html" title="Programming ATmega328P chips" /><published>2025-04-10T00:00:00+08:00</published><updated>2025-04-10T00:00:00+08:00</updated><id>http://localhost:4000/archive/arduino-uno</id><author><name>Wickramage Don Sadeep Madurange</name></author><summary type="html"><![CDATA[This post is a step-by-step guide for wiring up ATmega328P ICs to run at 5 V with a 16 MHz crystal and 3.3 V with an 8 MHz crystal. While the 5 V configuration is common, the 3.3 V configuration can be advantageous in low-power applications and when interfacing with parts that run at 3.3 V.]]></summary></entry><entry><title type="html">Bare-metal ARM Cortex M3 chips</title><link href="http://localhost:4000/archive/arduino-due/" rel="alternate" type="text/html" title="Bare-metal ARM Cortex M3 chips" /><published>2024-10-05T00:00:00+08:00</published><updated>2024-10-05T00:00:00+08:00</updated><id>http://localhost:4000/archive/arduino-due</id><author><name>Wickramage Don Sadeep Madurange</name></author><summary type="html"><![CDATA[This post is about programming bare metal SAM3X8E Arm Cortex M3 chips found on Arduino Due boards. I had to learn how to do this because none of the high-level tools for programming Arduino Dues are available for OpenBSD, which I use for much of my personal computing.]]></summary></entry></feed>
\ No newline at end of file +<?xml version="1.0" encoding="utf-8"?><feed xmlns="http://www.w3.org/2005/Atom" ><generator uri="https://jekyllrb.com/" version="4.4.1">Jekyll</generator><link href="/feed.xml" rel="self" type="application/atom+xml" /><link href="/" rel="alternate" type="text/html" /><updated>2025-11-02T11:45:12+08:00</updated><id>/feed.xml</id><title type="html">ASCIIMX | Archive</title><author><name>Wickramage Don Sadeep Madurange</name></author><entry><title type="html">Neo4J A* search</title><link href="/archive/neo4j-a-star-search/" rel="alternate" type="text/html" title="Neo4J A* search" /><published>2025-09-14T00:00:00+08:00</published><updated>2025-09-14T00:00:00+08:00</updated><id>/archive/neo4j-a-star-search</id><author><name>Wickramage Don Sadeep Madurange</name></author><summary type="html"><![CDATA[Back in 2018, we used the Neo4J graph database to track the movement of marine vessels. We were interested in the shortest path a ship could take through a network of about 13,000 route points. Performance issues with Neo4J’s then-available shortest-path algorithms limited our search to about 4,000 route points.]]></summary></entry><entry><title type="html">My first PCB</title><link href="/archive/my-first-pcb/" rel="alternate" type="text/html" title="My first PCB" /><published>2025-07-14T00:00:00+08:00</published><updated>2025-07-14T00:00:00+08:00</updated><id>/archive/my-first-pcb</id><author><name>Wickramage Don Sadeep Madurange</name></author><summary type="html"><![CDATA[In 2023, I started tinkering with DIY electronics as a hobby. Until now, I’ve been using development boards like the Arduino Uno and ESP-32-WROOM so that I can focus on the software. Recently, I decided to step outside of my comfort zone and design a PCB from scratch for a door lock I’m working on.]]></summary></entry><entry><title type="html">MOSFETs</title><link href="/archive/mosfet-switches/" rel="alternate" type="text/html" title="MOSFETs" /><published>2025-06-22T00:00:00+08:00</published><updated>2025-06-22T00:00:00+08:00</updated><id>/archive/mosfet-switches</id><author><name>Wickramage Don Sadeep Madurange</name></author><summary type="html"><![CDATA[Recently, I needed a low-power circuit for one of my battery-operated projects. Much of the system’s power savings depended on its ability to switch off power to components, such as servos, electronically when not needed. That’s how I stumbled upon MOSFETs, transistors capable of controlling circuits operating at voltages far above their own.]]></summary></entry><entry><title type="html">Awesome books</title><link href="/archive/awesome-books/" rel="alternate" type="text/html" title="Awesome books" /><published>2025-04-20T00:00:00+08:00</published><updated>2025-04-20T00:00:00+08:00</updated><id>/archive/awesome-books</id><author><name>Wickramage Don Sadeep Madurange</name></author><summary type="html"><![CDATA[This article contains a list of my favourite books.]]></summary></entry><entry><title type="html">Programming ATmega328P chips</title><link href="/archive/arduino-uno/" rel="alternate" type="text/html" title="Programming ATmega328P chips" /><published>2025-04-10T00:00:00+08:00</published><updated>2025-04-10T00:00:00+08:00</updated><id>/archive/arduino-uno</id><author><name>Wickramage Don Sadeep Madurange</name></author><summary type="html"><![CDATA[This post is a step-by-step guide for wiring up ATmega328P ICs to run at 5V with a 16MHz crystal and 3.3V with an 8MHz crystal. While the 5V configuration is common, the 3.3V configuration can be advantageous in low-power applications and when interfacing with parts that run at 3.3V.]]></summary></entry><entry><title type="html">Bare-metal ARM Cortex M3 chips</title><link href="/archive/arduino-due/" rel="alternate" type="text/html" title="Bare-metal ARM Cortex M3 chips" /><published>2024-10-05T00:00:00+08:00</published><updated>2024-10-05T00:00:00+08:00</updated><id>/archive/arduino-due</id><author><name>Wickramage Don Sadeep Madurange</name></author><summary type="html"><![CDATA[This post is about programming bare metal SAM3X8E Arm Cortex M3 chips found on Arduino Due boards. I had to learn how to do this because none of the high-level tools for programming Arduino Dues are available for OpenBSD, which I use for much of my personal computing.]]></summary></entry></feed>
\ No newline at end of file diff --git a/_site/posts.xml b/_site/posts.xml index feb444a..1ecb22e 100644 --- a/_site/posts.xml +++ b/_site/posts.xml @@ -1 +1 @@ -<?xml version="1.0" encoding="utf-8"?><feed xmlns="http://www.w3.org/2005/Atom" ><generator uri="https://jekyllrb.com/" version="4.4.1">Jekyll</generator><link href="http://localhost:4000/posts.xml" rel="self" type="application/atom+xml" /><link href="http://localhost:4000/" rel="alternate" type="text/html" /><updated>2025-11-02T11:27:10+08:00</updated><id>http://localhost:4000/posts.xml</id><title type="html">ASCIIMX</title><author><name>Wickramage Don Sadeep Madurange</name></author></feed>
\ No newline at end of file +<?xml version="1.0" encoding="utf-8"?><feed xmlns="http://www.w3.org/2005/Atom" ><generator uri="https://jekyllrb.com/" version="4.4.1">Jekyll</generator><link href="/posts.xml" rel="self" type="application/atom+xml" /><link href="/" rel="alternate" type="text/html" /><updated>2025-11-02T11:45:12+08:00</updated><id>/posts.xml</id><title type="html">ASCIIMX</title><author><name>Wickramage Don Sadeep Madurange</name></author></feed>
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