![]() ![]() Note that this implementation of printf will NOT print floats or doubles. Printf is a standard C function that lets you format text much easier than using Arduino's built-in print and println. It's added to the Print class and will work with all libraries that inherit Print. If you're not familiar with printf you should probably read this first. Unlike the official Arduino cores, MiniCore has printf support out of the box. If you want to read more about LTO and GCC flags in general, head over to the GNU GCC website! Printf support Simply enable it in the "Tools" menu, and your code is ready for compilation. ![]() I encourage you to try the new LTO option and see how much smaller your code gets! Note that you don't need to hit "Burn Bootloader" in order to enable LTO. Enabling LTO in IDE 1.6.10 or older will return an error. I've chosen to disable this by default to make sure the core keep its backwards compatibility. In Arduino IDE 1.6.11 and newer LTO is enabled by default. ![]() The LTO optimizes the code at link time, making the code (often) significantly smaller without making it "slower". Link time optimization / LTOĪfter Arduino IDE 1.6.11 where released, There have been support for link time optimization or LTO for short. Note that when uploading using a bootloader, the EEPROM will always be retained. You'll have to connect an ISP programmer and hit "Burn bootloader" to enable or disable EEPROM retain. If you want the EEPROM to be erased every time you burn the bootloader or upload using a programmer, you can turn off this option. Below is a table that shows the available BOD options: To change the BOD settings you'll have to connect an ISP programmer and hit "Burn bootloader". ![]() BOD optionīrown out detection, or BOD for short lets the microcontroller sense the input voltage and shut down if the voltage goes below the brown out setting. Note that you have need to connect a programmer and hit Burn bootloader if you want to change any of the Upload port settings. You'll have to select No bootloader hit "upload" or the "burn bootloader" for this to happen. Unlike official Arduino AVR boards, the bootloader isn't automatically removed when you upload using a programmer. If your application doesn't need or require a bootloader for uploading code you can also choose to disable this by selecting No bootloader. UART0 is the default port for all targets, but ATmega328PB can also use UART1. MiniCore lets you select which serial port you want to use for uploading. See comment above this tableĭerived from the 8 MHz internal oscillator Great clock for UART communication with no error Upload the code using a programmer (USBasp, USBtinyISP etc.)ĭefault clock on most AVR based Arduino boards and MiniCore.Edit the baudrate line in the boards.txt file, and choose either 115200, 57600, 38400 or 19200 baud.If uploading failes while using the 8 MHz internal oscillator you have these options: It's factory calibrated but may be a little "off" depending on the calibration, ambient temperature and operating voltage. You might experience upload issues when using the internal oscillator. For time critical operations an external crystal/oscillator is recommended. Make sure you connect an ISP programmer, and select the correct one in the "Programmers" menu. You'll have to hit "Burn bootloader" in order to set the correct fuses and upload the correct bootloader. Select the microcontroller in the boards menu, then select the clock frequency. MiniCore supports a variety of different clock frequencies. * ATmega328PB has 9 PWM pins Supported clock frequencies Try writing a register name, DDRB for instance, and see for yourself! Table of contentsĬan't decide what microcontroller to choose? Have a look at the specification table below: Make sure to test the example files (File > Examples > AVR C code examples). If you're into "generic" AVR programming, I'm happy to tell you that all relevant keywords are being highlighted by the IDE through a separate keywords file. This core gives you two extra IO pins if you're using the internal oscillator! PB6 and PB7 is mapped to Arduino pin 20 and 21. This core requires at least Arduino IDE v1.6.2, where v1.8.13+ is recommended. An Arduino core for the ATmega328, ATmega168, ATmega88, ATmega48 and ATmega8, all running a custom version of Optiboot for increased functionality. ![]()
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