#if defined(ARDUINO_ARCH_AVR) #if SPI_CLOCK > (F_CPU / 128) #define USE_HARDWARE_SPI #endif #endif // Configure which pins to use: // The standard pin configuration. Currently only for AVR, for other architectures (Due, Zero.), hardware SPI // is probably too fast anyway.

divide target // f_cpu by 6: // #define SPI_CLOCK (128000/6) // // A clock slow enough for an ATtiny85 1 MHz, is a reasonable default: #define SPI_CLOCK (1000000/6) // Select hardware or software SPI, depending on SPI clock. for an ATtiny 128 kHz: the datasheet states that both the high and low // SPI clock pulse must be > 2 CPU cycles, so take 3 cycles i.e. // Put an LED (with resistor) on the following pins: // 9: Heartbeat - shows the programmer is running // 8: Error - Lights up if something goes wrong (use red if that makes sense) // 7: Programming - In communication with the slave // #include 'Arduino.h' #undef SERIAL #define PROG_FLICKER true // Configure SPI clock (in Hz). A simple way to accomplish this is to power the complete system (programmer // and target) at 3V3. ) as // the programmer, make sure to not expose any of the programmer's pins to 5V. // IMPORTANT: When using an Arduino that is not 5V tolerant (Due, Zero. // Alternatively you can use any other digital pin by configuring // software ('BitBanged') SPI and having appropriate defines for PIN_MOSI, // PIN_MISO and PIN_SCK. This will work even when not // using an Uno. If you find this wiring more // practical, have a define USE_OLD_STYLE_WIRING. That is why many tutorials instruct // you to hook up the target to these pins. GND // // On some Arduinos (Uno.), pins MOSI, MISO and SCK are the same pins as // digital pin 11, 12 and 13, respectively. On all Arduinos, these pins can be found // on the ICSP/SPI header: // // MISO °. // By default, the hardware SPI pins MISO, MOSI and SCK are used to communicate // with the target. ArduinoISP // Copyright (c) 2008-2011 Randall Bohn // If you require a license, see // // // This sketch turns the Arduino into a AVRISP using the following Arduino pins: // // Pin 10 is used to reset the target microcontroller.

Install ch340g driver