lab 01: segment display

Second lab that I did in hackespace.

Assembly project created in Atmel Studio and flashed on Atmega16 on Pinboard2 Rev 2. It used one of the atmega timers, and port d to supply data into 7seg display.

Building this lab on OpenBSD

Started with 8Mhz frequency for MCU and switched to 1Mhz

Table of MCU frequency, OCR1A value and fusebits for avrdude

OCR1A — output control register for timer counter 1.

freq	dec	hex	fusebits (xHL)
8 Mhz	31250	0x7A12	0xE4D9
2 Mhz	7813	0x1E85	0xE2D9
1 Mhz	3907	0x0C19	0xE1D9

How to calculate:

1. 256 / freq = x
2. 1 / x = res
3. Round and convert to hex