enble boot after power loss/restore
@gechu, thanks all good information.
One of the comments in last link(thread) had me thinking I've seen the green led lit for a bit even after disconnecting the barrel connector (meaning some residual energy stored in the board (caps and such).
In my former testing of all four boards I just unpluged, waited a second and plugged back in. So I did a few trials and if I set a timer for 1min then the board would BOOT every time on plugging back in the barrel connector.
Ok that's better. Of course a power "blib" might result in the board not coming back up but a regular power outage should come back up. So something is not quite the same on that board as the others where I can unplug and plug quickly and they will boot.
Makes me want to put a 20K resistor between 5V pin and ground see if having a "bleed" would "fix" the issue. Worst case if this can happen I can use an esp32 as a watchdoog and if board doesn't come up the watchdog an give it a good 1 min power off power cycle.
Well at least now I know it is not firmware (u-boot/spi) related. I didn't think it was because I had shorted pins 23 and 25 which is supposed to bypass spi booting and that didn't change a thing.
One of the comments in last link(thread) had me thinking I've seen the green led lit for a bit even after disconnecting the barrel connector (meaning some residual energy stored in the board (caps and such).
In my former testing of all four boards I just unpluged, waited a second and plugged back in. So I did a few trials and if I set a timer for 1min then the board would BOOT every time on plugging back in the barrel connector.
Ok that's better. Of course a power "blib" might result in the board not coming back up but a regular power outage should come back up. So something is not quite the same on that board as the others where I can unplug and plug quickly and they will boot.
Makes me want to put a 20K resistor between 5V pin and ground see if having a "bleed" would "fix" the issue. Worst case if this can happen I can use an esp32 as a watchdoog and if board doesn't come up the watchdog an give it a good 1 min power off power cycle.
Well at least now I know it is not firmware (u-boot/spi) related. I didn't think it was because I had shorted pins 23 and 25 which is supposed to bypass spi booting and that didn't change a thing.
