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by gb3213
Mon Feb 12, 2018 5:09 am
Forum: Bare metal, Assembly language
Topic: [SOLVED] RPi3: why does use of the Mini-UART deactivate GPIO19?
Replies: 2
Views: 983

Re: RPi3: why does use of the Mini-UART deactivate GPIO19?

I did further experimentation. If instead of using GPIOs 5, 6, 13, 16, 19, and 26 (with 19 being disabled once I activate the Mini-UART) I use GPIOs 5, 6, 12, 13, 16, 26 then GPIO 16 flips to Input when I activate the Mini-UART. However, if I use GPIOs 5, 6, 12, 13, 21, 26 everything works as expect...
by gb3213
Sun Feb 11, 2018 8:53 pm
Forum: Bare metal, Assembly language
Topic: [SOLVED] RPi3: why does use of the Mini-UART deactivate GPIO19?
Replies: 2
Views: 983

Re: RPi3: why does use of the Mini-UART deactivate GPIO19?

ps: in fact, when I dump the content of the FSEL registers after enabling the Mini-UART, I see that GPIO 19 entered the Input function (000). 10 987 654 321 098 765 432 109 876 543 210 0b00 000 000 000 000 000 000 000 000 000 000 9 8 7 6 5 4 3 2 1 0 FSEL0: 0b00 000 000 000 001 001 000 000 000 000 00...
by gb3213
Sun Feb 11, 2018 6:23 am
Forum: Bare metal, Assembly language
Topic: [SOLVED] RPi3: why does use of the Mini-UART deactivate GPIO19?
Replies: 2
Views: 983

[SOLVED] RPi3: why does use of the Mini-UART deactivate GPIO19?

I'm following along with Stanford's new CS140e course and noticed something peculiar I cannot explain. My kernel boots up and sets up GPIOs 16, 5, 6, 13, 19, 26 referring to pinouts 36, 29, 31, 33, 35, 37 as shown here: https://web.stanford.edu/class/cs140e/assignments/0-blinky/images/pi3-gpio-pinou...

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