Comments (2)
No, you can't remove the R1 resistor on GPIO18 because it is used to detect the Amiga board (Simple mode). If it is missing the software assumes it is running on the CPLD board instead. The relevant code is in init_hardware() which sets GPIO18 (VERSION_PIN) to an input and reads back the level. If the resistor is fitted it reads back as low, if not it reads back as high due to a weak internal pullup on the Pi. It is then set as an output to control the CPLD board.
from amiga-digital-video.
No, you can't remove the R1 resistor on GPIO18 because it is used to detect the Amiga board (Simple mode). If it is missing the software assumes it is running on the CPLD board instead. The relevant code is in init_hardware() which sets GPIO18 (VERSION_PIN) to an input and reads back the level. If the resistor is fitted it reads back as low, if not it reads back as high due to a weak internal pullup on the Pi. It is then set as an output to control the CPLD board.
Ah, ok. Thanks for the info! It turns out I didn't use the wrong resistor after all, anyway.
from amiga-digital-video.
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