Bootloader Support ATtiny , , , 87, only The Optiboot bootloader is included for the ATtiny , , and x7 series 87 and This runs at baud at 8mhz and slower, and baud above that. Once the bootloader is programmed, the target can be programmed over serial; the bootloader will run after reset, just like on a normal Arduino. The standard DTR reset circuit is highly recommended. Because of this, the Watchdog Timer interrupt vector will always point to the start of the program, and cannot be used for other functionality.
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I therefore needed to find a replacement way of generating simple tones. There are several existing tone libraries for the ATtiny85, but they all seemed overcomplicated for what I wanted. This divides the clock frequency, which is either 1MHz or 8MHz, by a prescaler, and then by a one-byte counter.
The square wave is output on digital output 1. Because the prescaler divides the clock by a power of two it provides a convenient way of generating the octave. To use it with an 8MHz clock add 3 to the prescaler, to reduce the frequency by an additional factor of 8, as shown in the commented second line of the routine.
Note that for historical reasons each octave goes from C to B; for example, the next note after B4 is C5, and so on. To create a note of a specified length we need to stop the counter when the duration has elapsed. One approach is to get the timer to call an interrupt service routine on every cycle; we can then count how many cycles have elapsed, and stop the counter after the appropriate number.
This is the approach taken by Bruce E. However, I decided it was simpler to use the delay function to time the note; after the delay has elapsed we stop the counter by writing 0 to the prescaler register.
Quick Gotcha list: This core includes part specific documentation - click the links above for your family of chips and READ IT These describe issues and "gotchas" specific to certain chips. Be sure to review this documentation! There is a bug in the IDE that causes compilation errors with some combinations of boards and submenu options on 1. This issue impacts many parts on ATTinyCore 1. To fix this issue without downgrading ATTinyCore, update to 1.
Arduino IDE に ATtiny45/85/2313 他の開発環境を組み込む
ATTINY261V-10PU - AVR MCU, 2K FLASH, 128B RAM, 261