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Step 8The software
The software is written in C for the Atmel using GCC.
There are really nothing special about the software. Timer0 is used to generate interrupts every 1638.4 uS and the Bresenham algorithm is used to make sure that the clock ticks at average every second.
After power on the the clock displays a dot that flashed up & down to indicate that the time must be set.
By pressing the button the time advances as a slow rate for 15 seconds and then speeds up. If the button is just pressed momentarily (0.1-0.5 seconds) the time is decremented by one minute for easy adjustment.
There are really nothing special about the software. Timer0 is used to generate interrupts every 1638.4 uS and the Bresenham algorithm is used to make sure that the clock ticks at average every second.
After power on the the clock displays a dot that flashed up & down to indicate that the time must be set.
By pressing the button the time advances as a slow rate for 15 seconds and then speeds up. If the button is just pressed momentarily (0.1-0.5 seconds) the time is decremented by one minute for easy adjustment.
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May 11, 2008. 3:46 PM
jeff-o
says:
jeff-o
says:
Hi Mats, I've got the 20MHz version of the ATtiny2313. I assume I have to change all of the "10000000" references to 20000000, right? Do I have to touch the 1638.4 uS timer0 interrupt or will that take care of itself if the program know what speed it's running at?
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