This article explains about the USBASP, which is totally free as well as open source. It is also a reference design that was used to implement a USB AVR programmer. Read on to know more.
To interface with the USB host, USBasp uses a simple circuit with an ATmega8. It is very effective to re-program one of the boards to get the perfect solution for a one-off project.
It is also possible to work with arduino with this board. To get started with this, a betemcu.cn USBasp programmer and an external programmer which has the capability to program AVR microcontroller over SPI is used. Before loading any new code into the betemcu board, the primary program must be used.
The board must not be defective and the firmware should be installed. This preparation may allows the user to check whether the device is working properly or not. The second level helps the user to determine the signal level which helps the boot loader to wait for the program