S-AVR » Simple Console
I was never much good at getting up in the morning, until I became a Relentless junkie. Set your alarm for 6:30am, drag yourself out of bed, wrestle with the overwhelming desire to lie down on the kitchen floor. Drink half a can before breakfast, and then you can S-AVR your Serial before the sun comes up.
Now is where the fun starts. With just a few lines of C you can make a simple console program to upload to your S-AVR, allowing you to communicate with your MCU using HyperTerminal (or an equivalent).
Download the code:
simpleconsole.tar.gz
Unpack it and run make flash to compile it and upload the code to your S-AVR. Now open HyperTerminal (or an equivalent). Go File->Properties and select the COM port that your S-AVR is connected to. Then click Configure and enter these details:
Now switch to the Settings tab, click ASCII Setup and enter these details:
Now go Call->Call and press the reset button on the S-AVR. You should see the console:
You can now set the data direction registers DDRA, DDRB, DDRC and DDRD from the console:
> da=ff
DDRA=0xFF
> db=00
DDRB=0x00
> dc=00
DDRC=0x00
> dd=00
DDRD=0x00
>The effect of this is to configure port A as all outputs, and the other ports as inputs. You can now set the state of the port A outputs:
> pa=72
PORTA=0x72
>The S-AVR:LED board now displays 0x72:
You can also read the state of each port. Try putting a resistor between +5v and PC7:
...and then reading the state of port C:
> ?pc
PORTC=0x80
>I hope the implications of this are not lost on you. You now have complete remote-control of all the ports on the MCU. You can add more commands at will, allowing you to control what the MCU does from a CLI.
