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Grand Central M4 Entering bootloading mode via firmware not
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Grand Central M4 Entering bootloading mode via firmware not

by blaiseyen on Mon Apr 05, 2021 2:33 pm

Hi
I am trying to find a way to enter into bootloading mode by command in the firmware, not by having to manually double press the reset button.

I tried tying the RST pin to a GPIO and put the pin in low but the M4 seems to just reboot when I try to put the GPIO pin high.

I really appreciate any suggestions here.

Thanks!

blaiseyen
 
Posts: 1
Joined: Mon Apr 05, 2021 2:27 pm

Re: Grand Central M4 Entering bootloading mode via firmware

by mikeysklar on Tue Apr 06, 2021 6:57 pm

@blaiseyen,

Interesting idea. I've not tried this before.

Looking at the schematic for the Grand Central M4 I see you have the right idea trying to pull RESET to GND. The reboot you are seeing could also be from holding RESET to GND too long. With the GPIO are you doing a 2x toggle to GND?

I would think a pull-up resistor could be used with your GPIO to prevent the high issue. Another option would be to leave the GPIO floating.

mikeysklar
 
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Joined: Mon Aug 01, 2016 8:10 pm

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