Thank you for the reply! The problem is that when I set the pin
value/direction before entering sleep mode (using /sys/class/gpio...), it
immediately returns to its initial state upon entering sleep mode. When I
wake the BBB up it will return to the value I configured, however.
Where would I set the default sleep mode config for a pin in the device
tree? Is there a spot in am335x-bone-common-pinmux.dtsi?
On Tuesday, May 31, 2016 at 2:48:02 PM UTC-4, William Hermans wrote:
>
> Yes. You can initially use universal IO to configure the pin(s), and then
> when it is time to sleep, use config-pin to change the pins direction, and
> / of value. There is also the /sys/class/gpio/* sysfs set of sub
> directories, but I'm unsure how one would use /sys/class/gpio/export, etc
> if the pin it already configured via a deice tree file. Perhaps the device
> tree file could take care of the mux mode only, and the sysfs gpio sub
> system could configure the rest ?
>
> On Tue, May 31, 2016 at 10:33 AM, E Mag <e_...@live.ca <javascript:>>
> wrote:
>
>> Hi,
>>
>> Is there a way to set the GPIO pins into a specific state before entering
>> sleep mode on the BBB? I know you can set their configuration in the device
>> tree e.g.:
>>
>> wlan_pins_sleep: pinmux_wlan_pins_sleep {
>> pinctrl-single,pins = <
>> 0x28 (PIN_OUTPUT_PULLUP | MUX_MODE7) /*
>> gpmc_ad10.gpio0_26 WL_EN*/
>> 0x2C (PIN_INPUT_PULLUP | MUX_MODE7) /*
>> gpmc_ad11.gpio0_27 WL_IRQ*/
>> 0x7C (PIN_OUTPUT_PULLDOWN | MUX_MODE0) /*
>> gpmc_csn0.gpio1_29 BF_EN*/
>> >;
>> };
>>
>> But is there a way to set a default output state for certain pins upon
>> entering sleep mode without involving the PRU?
>>
>> Thank you,
>>
>> -Eric
>>
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>
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