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Diffstat (limited to '_site/archive/arduino-uno')
| -rw-r--r-- | _site/archive/arduino-uno/3v3.Makefile | 46 | ||||
| -rw-r--r-- | _site/archive/arduino-uno/Makefile | 43 | ||||
| -rw-r--r-- | _site/archive/arduino-uno/breadboard.jpeg | bin | 54319 -> 0 bytes | |||
| -rw-r--r-- | _site/archive/arduino-uno/index.html | 139 | ||||
| -rw-r--r-- | _site/archive/arduino-uno/pinout.png | bin | 247197 -> 0 bytes |
5 files changed, 0 insertions, 228 deletions
diff --git a/_site/archive/arduino-uno/3v3.Makefile b/_site/archive/arduino-uno/3v3.Makefile deleted file mode 100644 index 4ca89d4..0000000 --- a/_site/archive/arduino-uno/3v3.Makefile +++ /dev/null @@ -1,46 +0,0 @@ -CC = avr-gcc -MCU = atmega328p -PORT = /dev/cuaU0 -TARGET = app - -SRC = main.c -OBJ = $(SRC:.c=.o) - -CFLAGS = -std=gnu99 -CFLAGS += -Os -CFLAGS += -Wall -CFLAGS += -mmcu=$(MCU) -CFLAGS += -DBAUD=57600 -CFLAGS += -DF_CPU=8000000UL -CFLAGS += -ffunction-sections -fdata-sections - -LDFLAGS = -mmcu=$(MCU) -LDFLAGS += -Wl,--gc-sections - -HEX_FLAGS = -O ihex -HEX_FLAGS += -j .text -j .data - -AVRDUDE_FLAGS = -p $(MCU) -AVRDUDE_FLAGS += -c arduino -AVRDUDE_FLAGS += -b 57600 -AVRDUDE_FLAGS += -P $(PORT) -AVRDUDE_FLAGS += -D -U - -%.o: %.c - $(CC) $(CFLAGS) -c -o $@ $< - -elf: $(OBJ) - $(CC) $(LDFLAGS) $(OBJ) -o $(TARGET).elf - -hex: elf - avr-objcopy $(HEX_FLAGS) $(TARGET).elf $(TARGET).hex - -upload: hex - avrdude $(AVRDUDE_FLAGS) flash:w:$(TARGET).hex:i - -.PHONY: clean - -clean: - rm -f *.o *.elf *.hex - - diff --git a/_site/archive/arduino-uno/Makefile b/_site/archive/arduino-uno/Makefile deleted file mode 100644 index 9db7b09..0000000 --- a/_site/archive/arduino-uno/Makefile +++ /dev/null @@ -1,43 +0,0 @@ -CC = avr-gcc -MCU = atmega328p -PORT = /dev/cuaU0 -TARGET = app - -SRC = main.c -OBJ = $(SRC:.c=.o) - -CFLAGS = -std=gnu99 -CFLAGS += -Os -CFLAGS += -Wall -CFLAGS += -mmcu=$(MCU) -CFLAGS += -DBAUD=115200 -CFLAGS += -DF_CPU=16000000UL -CFLAGS += -ffunction-sections -fdata-sections - -LDFLAGS = -mmcu=$(MCU) -LDFLAGS += -Wl,--gc-sections - -HEX_FLAGS = -O ihex -HEX_FLAGS += -j .text -j .data - -AVRDUDE_FLAGS = -p $(MCU) -AVRDUDE_FLAGS += -c arduino -AVRDUDE_FLAGS += -P $(PORT) -AVRDUDE_FLAGS += -D -U - -%.o: %.c - $(CC) $(CFLAGS) -c -o $@ $< - -elf: $(OBJ) - $(CC) $(LDFLAGS) $(OBJ) -o $(TARGET).elf - -hex: elf - avr-objcopy $(HEX_FLAGS) $(TARGET).elf $(TARGET).hex - -upload: hex - avrdude $(AVRDUDE_FLAGS) flash:w:$(TARGET).hex:i - -.PHONY: clean - -clean: - rm *.o *.elf *.hex diff --git a/_site/archive/arduino-uno/breadboard.jpeg b/_site/archive/arduino-uno/breadboard.jpeg Binary files differdeleted file mode 100644 index bd74907..0000000 --- a/_site/archive/arduino-uno/breadboard.jpeg +++ /dev/null diff --git a/_site/archive/arduino-uno/index.html b/_site/archive/arduino-uno/index.html deleted file mode 100644 index 2b4f64d..0000000 --- a/_site/archive/arduino-uno/index.html +++ /dev/null @@ -1,139 +0,0 @@ -<!DOCTYPE html> -<html> - <head> - <meta charset="utf-8"> - <title>How to configure ATmega328P microcontrollers to run at 3.3V and 5V</title> - - <head> - <meta charset="utf-8"> - <meta name="viewport" content="width=device-width, initial-scale=1"> - <title>How to configure ATmega328P microcontrollers to run at 3.3V and 5V</title> - <link rel="stylesheet" href="/assets/css/main.css"> - <link rel="stylesheet" href="/assets/css/skeleton.css"> -</head> - - - - </head> - <body> - - <div id="nav-container" class="container"> - <ul id="navlist" class="left"> - - <li > - <a href="/" class="link-decor-none">hme</a> - </li> - <li class="active"> - <a href="/archive/" class="link-decor-none">blg</a> - </li> - <li > - <a href="/projects/" class="link-decor-none">poc</a> - </li> - <li > - <a href="/about/" class="link-decor-none">abt</a> - </li> - <li><a href="/feed.xml" class="link-decor-none">rss</a></li> - </ul> -</div> - - - - <main> - <div class="container"> - <div class="container-2"> - <h2 class="center" id="title">HOW TO CONFIGURE ATMEGA328P MICROCONTROLLERS TO RUN AT 3.3V AND 5V</h2> - <h6 class="center">10 APRIL 2025</h5> - <br> - <div class="twocol justify"><p>This is a quick reference for wiring up ATmega328P ICs to run at 5V and 3.3V. -While the 5V configuration is common, the 3.3V configuration can be useful in -low-power applications and when interfacing with parts that themselves run at -3.3V. In this guide, the 5V setup is configured with a 16MHz crystal -oscillator, while the 3.3V configuration makes use of an 8MHz crystal -oscillator.</p> - -<p>The steps that follow refer to the following pinout.</p> - -<table style="border: none; width: 100%;"> - <tr style="border: none;"> - <td style="border: none; width: 50%; vertical-align: top;"> - <img src="pinout.png" alt="Pinout" style="width: 100%" /> - <p style="text-align: center;">Pinout</p> - </td> - <td style="border: none; width: 50%; vertical-align: top;"> - <img src="breadboard.jpeg" alt="Circuit" style="width: 100%" /> - <p style="text-align: center;">Breadboard</p> - </td> - </tr> -</table> - -<h2 id="5v-16mhz-configuration">5V-16MHz configuration</h2> - -<p>Powering ATmega328P microcontrollers with 5V is the most common setup. This is -also how Arduino Uno boards are wired.</p> - -<p>In this configuration, the microcontroller’s pin 1 is connected to 5V via a -10kΩ resistor. Pins 9 and 10 are connected to a 16MHz crystal oscillator via -two 22pF capacitors connected to ground. The microcontroller is powered by -connecting pins 7, 20, and 21 to a 5V DC power supply. Lastly, pins 8 and 22 -are connected to ground. In addition to the these connections, which are -required, it’s a good idea to add 0.1μF decoupling capacitors between pins 7, -20, and 21 and ground.</p> - -<p><a href="Makefile">Here’s</a> a sample Makefile for compiling C programs for ATmega328P -microcontrollers using avr-gcc/avrdude toolchain.</p> - -<h2 id="33v-8mhz-configuration">3.3V-8MHz configuration</h2> - -<p>Electrical connections for running an ATmega328P at 3.3V are identical to that -of the 5V circuit. The only differences are that all the 5V connections are -replaced with a 3.3V power source and a 8MHz crystal oscillator takes the place -of the 16MHz crystal.</p> - -<p>However, standard ATmega328P chips are preconfigured to run at 5V. To run one -at 3.3V, we must first modify its fuses that control characteristics like the -BOD level. If a bootloader that expects a 16MHz clock (e.g., Arduino -bootloader) is pre-installed on the ATmega328P, it must be swapped with one -that accepts an 8MHz clock. To accomplish that, we need an in-system programmer -(ISP).</p> - -<p>Fortunately, we can turn an ordinary Arduino Uno board into an ISP by uploading -the ‘ArduinoISP’ sketch found in the Arduino IDE. The ISP communicates with the -microcontroller using a Serial Peripheral Interface (SPI). So, connect the SPI -port of the ATmega328P to that of the Arduino Uno, and the Uno’s SS pin -to the ATmega328P’s RESET pin.</p> - -<p>Power up the the ATmega328P by connecting its V<sub>CC</sub> to a 5V supply (we -can use Arduino Uno’s 5V pin). From the Arduino IDE, select ‘ATmega328P (3.3V, -8MHz)’ for processor from the tools menu. Also from the tools menu, select -‘Arduino as ISP’ as programmer. Finally, upload the new bootloader by selecting -‘Burn Bootloader’ from the tools menu.</p> - -<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 normally would using avrdude. -<a href="3v3.Makefile">Here’s</a> a sample Makefile with adjusted parameters (e.g., baud -rate) for an 8MHz clock.</p> - -<h2 id="remarks">Remarks</h2> - -<p>In both configurations, if you intend to use the ATmega328P’s analog-to-digital -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 in the -datasheet for more information.</p> - -</div> - <p class="post-author right">by W. D. Sadeep Madurange</p> - </div> - </div> - </main> - - <div class="footer"> - <div class="container"> - <div class="twelve columns right container-2"> - <p id="footer-text">© ASCIIMX - 2025</p> - </div> - </div> -</div> - - - </body> -</html> diff --git a/_site/archive/arduino-uno/pinout.png b/_site/archive/arduino-uno/pinout.png Binary files differdeleted file mode 100644 index 59acfbc..0000000 --- a/_site/archive/arduino-uno/pinout.png +++ /dev/null |
