AVR ISP
AVRISP is very popular Parallel port programmer for flashing AVR type microcontrollers. Earlier I used programmer connected to com port, but frequently I needed this port for other purposes, I decided to make it work on parallel port. The programmer on parallel port is much simpler than connected to serial port, because there is no needed voltage adapter like MAX232. You can only connect your MCU directly to port. But for safety reasons there is good practice to use buffer ship like 74HC244.
The header for programmer I used standard 6 pin ISP header.
I wanted to make compact programmer, so I put circuit inside LPT head. Few pictures of it:
Programming is usually done by using PonyProg software. Bellow is its configuration:
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June 6th, 2006 at 2:24 am
Connectors MISO connect to AVR MOSI pin and Connectors MOSI connect to AVR MISO pin. You may see that connectors MISO pin is input in programmer. I just made stupid mistake and connected MISO to MISO and it took me some time to figure out why it doesn’t work …
March 12th, 2007 at 3:59 pm
How can I check AVRISP?
I made it, and cann’t program ATmega16…
October 31st, 2007 at 3:59 pm
[...] AVR ISP Development Board (designed by [...]
May 6th, 2008 at 12:49 am
[...] port protection. It connects directly to LPT port without precautions. I definitely recommend using similar ISP circuit with buffer IC between LPT and target [...]