AVR Programmer

I use uisp under linux to program my AVR’s. The parallel port on my workbench PC has proven less than reliable so the STK200 style programmer I built was not performing well. I now use the serial port with a dasa style cable. The pinout is shown below. I use a toggle switch to toggle the RESET line as the software control proved unreliable on my setup. This toggled must be thrown each time you want to access the device. It is a bit of a hassle, but very reliable programming is possible.

DB9 AVR
3 MOSI
8 MISO
4 SCK
5 GND
6-pin ISP Header 10-pin ISP Header
(1)
MISO		 Vcc
SCK MOSI
RESET Gnd
(1)
MOSI		 Vcc
x Gnd
RESET Gnd
SCK Gnd
MISO Gnd

Some common uisp commands I use

Identify the AVR connected, basic check to see if you are communicating
uisp -dprog=dasa -dserial=/dev/ttyS1

Read the fuse bytes
uisp -dprog=dasa -dserial=/dev/ttyS1 --rd_fuses

Upload the file main.hex to flash and verify
uisp -dprog=dasa -dserial=/dev/ttyS1 --upload --verify if=main.hex