Yes. And sys_reset_n is just a RC-delayed version of the 3V3 supply. It
is not debounced
if activated by the reset switch and rises slowly in the classic
1-e-function style.
You need a Schmidt-trigger if you want to use it as a logic signal.
That sys_reset_n is high does not mean that you may drive some pins
(in my case P8. 39-46, the 8 pins accessible to PRU1 and also used by
the LCD.)
I found that I had to use an 74LVC244 for isolation; the 3stated pins of a
Xilinx Coolrunner II were not high-impedance enough.
When sys_reset_n goes away, the processor just starts; it has not yet
made up
its mind where to boot from.
I used a time constant of 3 times sys_reset_n to enable the 74lvc244.
regards, Gerhard
Am 30.11.18 um 21:54 schrieb Gerald Coley:
Yep, you are changing the boot mode of the processor. A big no no.
https://www.elinux.org/Beagleboard:BeagleBoneBlack#Expansion_Header_Pin_Usage
Gerald
*From:*[email protected]
[mailto:[email protected]] *On Behalf Of *Mike Brandon
*Sent:* Friday, November 30, 2018 2:52 PM
*To:* BeagleBoard <[email protected]>
*Subject:* [beagleboard] Beaglebone Black won't boot when gpio
connections made
I have a device plugged in via GPIO to the following gpio pins:
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