Atmel CPUs come at internal 1Mhz clock. To use USBasp you need to use a SPI clock under 1/4 of the clock, menas under 250Khz. By default the USBasp uses 375Khz and is unuseable for new AVR CPUs. This file (must rename to usbdrv.c before compile) is f

usbasp.固件，驱动，更新于2009年(USBasp is a USB in-circuit programmer for Atmel AVR controllers. It simply consists of an ATMega88 or an ATMega8 and a couple of passive components. The programmer uses a firmware-only USB driver, no special USB controller is ne