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Connecting to PWM and GPIO makes my motor to start
Sorry I can't give any figure as long as I don't know how many mA are flowing through the connection. You should put your multimeter in series to the connection and check it.

Furthermore I don't know what could be the mathematical formula which will determine at which voltage level the DRV8835 will respond to a valid starting level.

Perhaps  you need a few number of capacitors an try.They might be of 1000 uF, 220 uF, 100 uF, 50 uF and 10 uF, later it might be possible to play further delay with a resistor, which might not be necessary on the first testing. Within less than a USD you will find them to the nearest shop of  electronic components.

Other simpler option, it need to discover what is the current drawn by the DRV8835 Vcc pin. If that is lower than 12 mA, then you may use another TB pin to enable the start on the DRV8835, by supplying the Vcc with a TB GPIO pin, controlled by the program. In case the current is higher it may take a little MOSFET to boost the amps flow.

BTW, Highly appreciated if you don't repeat my messages, I'm able to read the original
Light blue words might be a link. Have you try to click on them? Big Grin

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