kaamos
Newbie level 1
Hello,
I've successfully built a slightly modified Potyo2 version and I've noticed the following issues:
1.- Using 33pF caps for crystal prevented the circuit from being recognized by the PC. Changing them to a lower value (22pF) solved the problem.
2.- Looking at the datasheet for BC237, I think that Q4 pins should be swapped.
3.- USB led does NOT light up when connected to RC1. I don't know the exact function of this led but if it is for USB enumeration, then I think it should be connected to RC2 (I have not taken a look at the hex file but when the device is connected to the PC there is a logical 1 on RC2 and a logical 0 on RC1.
Cheers!
I've successfully built a slightly modified Potyo2 version and I've noticed the following issues:
1.- Using 33pF caps for crystal prevented the circuit from being recognized by the PC. Changing them to a lower value (22pF) solved the problem.
2.- Looking at the datasheet for BC237, I think that Q4 pins should be swapped.
3.- USB led does NOT light up when connected to RC1. I don't know the exact function of this led but if it is for USB enumeration, then I think it should be connected to RC2 (I have not taken a look at the hex file but when the device is connected to the PC there is a logical 1 on RC2 and a logical 0 on RC1.
Cheers!